UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT

INVESTMENT COMPANIES

Investment Company Act file number: 811-22426

Name of Fund: BlackRock Taxable Municipal Bond Trust (BBN)

Fund Address:    100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: John M. Perlowski, Chief Executive Officer, BlackRock Taxable

                 Municipal Bond Trust, 55 East 52^nd Street, New York, NY 10055

Registrant’s telephone number, including area code: (800) 882-0052, Option 4

Date of fiscal year end: 07/31/2020

Date of reporting period: 07/31/2020

Item 1    – Report to Stockholders

JULY 31, 2020

2020 Annual Report

BlackRock Taxable Municipal Bond Trust (BBN)

Beginning on January 1, 2021, as permitted by regulations adopted by the Securities and Exchange Commission, paper copies of the Trust’s shareholder reports will no longer be sent by mail, unless you specifically request paper copies of the reports from BlackRock or from your financial intermediary, such as a broker-dealer or bank. Instead, the reports will be made available on a website, and you will be notified by mail each time a report is posted and provided with a website link to access the report.

You may elect to receive all future reports in paper free of charge. If you hold accounts directly with BlackRock, you can call Computershare at (800) 699-1236 to request that you continue receiving paper copies of your shareholder reports. If you hold accounts through a financial intermediary, you can follow the instructions included with this disclosure, if applicable, or contact your financial intermediary to request that you continue to receive paper copies of your shareholder reports. Please note that not all financial intermediaries may offer this service. Your election to receive reports in paper will apply to all funds advised by BlackRock Advisors, LLC or its affiliates, or all funds held with your financial intermediary, as applicable.

If you already elected to receive shareholder reports electronically, you will not be affected by this change and you need not take any action. You may elect to receive electronic delivery of shareholder reports and other communications by contacting your financial intermediary, if you hold accounts through a financial intermediary. Please note that not all financial intermediaries may offer this service.

Not FDIC Insured • May Lose Value • No Bank Guarantee

Section 19(a) Notices

BlackRock Taxable Municipal Bond Trust’s (BBN) (the “Trust”) amounts and sources of distributions reported are estimates and are being provided pursuant to regulatory requirements and are not being provided for tax reporting purposes. The actual amounts and sources for tax reporting purposes will depend upon the Trust’s investment experience during the year and may be subject to changes based on tax regulations. Shareholders will receive a Form 1099-DIV each calendar year that will inform them how to report these distributions for federal income tax purposes.

July 31, 2020

	Total Fiscal Year to Date Cumulative Distributions by Character										Percentage of Fiscal Year to Date Cumulative Distributions by Character
	Net Investment Income		Net Realized Capital Gains Short Term		Net Realized Capital Gains Long Term		Return of Capital		Total Per Common Share		Net Investment Income			Net Realized Capital Gains Short Term			Net Realized Capital Gains Long Term			Return of Capital			Total Per Common Share
BBN	$	1.341600	$	—	$	—	$	—	$	1.341600		100	%		0	%		0	%		0	%		100	%

Section 19(a) notices for the Trusts, as applicable, are available on the BlackRock website at blackrock.com.

2 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

The Markets in Review

Dear Shareholder,

The last 12 months have been a time of sudden change in global financial markets, as a long period of growth and positive returns was interrupted in early 2020 by the emergence and spread of the coronavirus. For the first half of the reporting period, U.S. equities and bonds both delivered impressive returns, despite fears and doubts about the economy that were ultimately laid to rest with unprecedented monetary stimulus and a sluggish yet resolute performance from the U.S. economy. But as the threat from the coronavirus (or “COVID-19”) became more apparent throughout February and March 2020, countries around the world took economically disruptive countermeasures, causing a global recession and a sharp fall in equity prices. While markets have since recovered most of these losses as countries around the world adapt to life with the virus, lingering uncertainty about the depth and duration of the pandemic and an uptick in global infection rates tempered optimism late in the reporting period.

Returns for most securities were robust for the first half of the reporting period, as investors began to realize that the U.S. economy was maintaining the modest yet steady growth that had characterized this economic cycle. However, once stay-at-home orders and closures of non-essential businesses became widespread, many workers were laid off and unemployment claims spiked. The subsequent rapid decline in equity prices was followed by a slow recovery, and some economic indicators began to improve. U.S. large-capitalization stocks, which are often considered more resilient than smaller companies during market turbulence, advanced significantly. International equities from developed economies ended the 12-month reporting period with negative performance, while emerging market stocks posted a positive return.

The performance of different types of fixed-income securities diverged substantially due to a reduced investor appetite for risk. Treasuries benefited from the risk-off environment, and posted healthy returns, as the 10-year U.S. Treasury yield (which is inversely related to bond prices) fell to an all-time low. Investment-grade corporate bonds also delivered solid returns, while high-yield corporate returns were more modest due to credit concerns.

The U.S. Federal Reserve (the “Fed”) reduced interest rates three times in 2019, to support slowing economic growth. After the coronavirus outbreak, the Fed instituted two emergency rate cuts, pushing short-term interest rates close to zero. To stabilize credit markets, the Fed also implemented a new bond-buying program, as did several other central banks around the world, including the European Central Bank and the Bank of Japan.

Looking ahead, while coronavirus-related disruptions have clearly hindered worldwide economic growth, we believe that the global expansion is likely to continue once the outbreak subsides. Several risks remain, however, including a potential resurgence of the coronavirus amid loosened restrictions, policy fatigue among governments already deep into deficit spending, and structural damage to the financial system from lengthy economic interruptions.

Overall, we favor a moderately positive stance toward risk, and in particular toward credit given the extraordinary central bank measures taken in recent months. This support extends beyond investment-grade corporates and into high-yield, leading to attractive opportunities throughout the credit market. We believe that both U.S. Treasuries and sustainable investments can help provide portfolio resilience, and the disruption created by the coronavirus appears to be accelerating the shift toward sustainable investments. We remain neutral on equities overall while favoring European stocks, which are poised for cyclical upside as re-openings continue.

In this environment, our view is that investors need to think globally, extend their scope across a broad array of asset classes, and be nimble as market conditions change. We encourage you to talk with your financial advisor and visit blackrock.com for further insight about investing in today’s markets.

Sincerely,

Rob Kapito

President, BlackRock Advisors, LLC

Rob Kapito

President, BlackRock Advisors, LLC

Total Returns as of July 31, 2020
	6-month	12-month
U.S. large cap equities (S&P 500® Index)	2.42%	11.96%
U.S. small cap equities (Russell 2000® Index)	(7.61)	(4.59)
International equities (MSCI Europe, Australasia, Far East Index)	(7.34)	(1.67)
Emerging market equities (MSCI Emerging Markets Index)	3.08	6.55
3-month Treasury bills (ICE BofA 3-Month U.S. Treasury Bill Index)	0.48	1.46
U.S. Treasury securities (ICE BofA 10-Year U.S. Treasury Index)	9.92	15.55
U.S. investment grade bonds (Bloomberg Barclays U.S. Aggregate Bond Index)	5.69	10.12
Tax-exempt municipal bonds (S&P Municipal Bond Index)	1.75	4.89
U.S. high yield bonds (Bloomberg Barclays U.S. Corporate High Yield 2% Issuer Capped Index)	0.62	4.07
Past performance is no guarantee of future results. Index performance is shown for illustrative purposes only. You cannot invest directly in an index.

3 THIS PAGE IS NOT PART OF YOUR FUND REPORT

Table of Contents

	Page
Section 19(a) Notice		2
The Markets in Review		3
Annual Report:
The Benefits and Risks of Leveraging		5
Derivative Financial Instruments		5
Trust Summary		6
Financial Statements:
Schedule of Investments		9
Statement of Assets and Liabilities		15
Statement of Operations		16
Statements of Changes in Net Assets		17
Statement of Cash Flows		18
Financial Highlights		19
Notes to Financial Statements		20
Report of Independent Registered Public Accounting Firm		26
Important Tax Information		27
Disclosure of Investment Advisory Agreement		28
Trust Investment Objectives, Policies and Risks		31
Automatic Dividend Reinvestment Plan		37
Trustee and Officer Information		38
Additional Information		41
Glossary of Terms Used in this Report		42

4

The Benefits and Risks of Leveraging

The Trust may utilize leverage to seek to enhance the distribution rate on, and net asset value (“NAV”) of, its common shares (“Common Shares”). However, there is no guarantee that these objectives can be achieved in all interest rate environments.

In general, the concept of leveraging is based on the premise that the financing cost of leverage, which is based on short-term interest rates, is normally lower than the income earned by the Trust on its longer-term portfolio investments purchased with the proceeds from leverage. To the extent that the total assets of the Trust (including the assets obtained from leverage) are invested in higher-yielding portfolio investments, the Trust’s shareholders benefit from the incremental net income. The interest earned on securities purchased with the proceeds from leverage (after paying the leverage costs) is paid to shareholders in the form of dividends, and the value of these portfolio holdings (less the leverage liability) is reflected in the per share NAV.

To illustrate these concepts, assume the Trust’s capitalization is $100 million and it utilizes leverage for an additional $30 million, creating a total value of $130 million available for investment in longer-term income securities. If prevailing short-term interest rates are 3% and longer-term interest rates are 6%, the yield curve has a strongly positive slope. In this case, the Trust’s financing costs on the $30 million of proceeds obtained from leverage are based on the lower short-term interest rates. At the same time, the securities purchased by the Trust with the proceeds from leverage earn income based on longer-term interest rates. In this case, the Trust’s financing cost of leverage is significantly lower than the income earned on the Trust’s longer-term investments acquired from such leverage proceeds, and therefore the holders of Common Shares (“Common Shareholders”) are the beneficiaries of the incremental net income.

However, in order to benefit shareholders, the return on assets purchased with leverage proceeds must exceed the ongoing costs associated with the leverage. If interest and other costs of leverage exceed the Trust’s return on assets purchased with leverage proceeds, income to shareholders is lower than if the Trust had not used leverage. Furthermore, the value of the Trust’s portfolio investments generally varies inversely with the direction of long-term interest rates, although other factors can influence the value of portfolio investments. In contrast, the value of the Trust’s obligations under its leverage arrangement generally does not fluctuate in relation to interest rates. As a result, changes in interest rates can influence the Trust’s NAVs positively or negatively. Changes in the future direction of interest rates are very difficult to predict accurately, and there is no assurance that the Trust’s intended leveraging strategy will be successful.

The use of leverage also generally causes greater changes in the Trust’s NAV, market price and dividend rates than comparable portfolios without leverage. In a declining market, leverage is likely to cause a greater decline in the NAV and market price of the Trust’s shares than if the Trust were not leveraged. In addition, the Trust may be required to sell portfolio securities at inopportune times or at distressed values in order to comply with regulatory requirements applicable to the use of leverage or as required by the terms of leverage instruments, which may cause the Trust to incur losses. The use of leverage may limit the Trust’s ability to invest in certain types of securities or use certain types of hedging strategies. The Trust incurs expenses in connection with the use of leverage, all of which are borne by shareholders and may reduce income to the shareholders. Moreover, to the extent the calculation of the Trust’s investment advisory fees includes assets purchased with the proceeds of leverage, the investment advisory fees payable to the Trust’s investment adviser will be higher than if the Trust did not use leverage.

The Trust may utilize leverage through reverse repurchase agreements as described in the Notes to Financial Statements.

Under the Investment Company Act of 1940, as amended (the “1940 Act”), the Trust is permitted to issue debt up to 33¹⁄₃% of its total managed assets. The Trust may voluntarily elect to limit its leverage to less than the maximum amount permitted under the 1940 Act.

If the Trust segregates or designates on its books and records cash or liquid assets having a value not less than the value of the Trust’s obligations under a reverse repurchase agreement (including accrued interest), then such transaction is not considered a senior security and is not subject to the foregoing limitations and requirements imposed by the 1940 Act.

Derivative Financial Instruments

The Trust may invest in various derivative financial instruments. These instruments are used to obtain exposure to a security, commodity, index, market, and/or other assets without owning or taking physical custody of securities, commodities and/or other referenced assets or to manage market, equity, credit, interest rate, foreign currency exchange rate, commodity and/or other risks. Derivative financial instruments may give rise to a form of economic leverage and involve risks, including the imperfect correlation between the value of a derivative financial instrument and the underlying asset, possible default of the counterparty to the transaction or illiquidity of the instrument. The Trust’s successful use of a derivative financial instrument depends on the investment adviser’s ability to predict pertinent market movements accurately, which cannot be assured. The use of these instruments may result in losses greater than if they had not been used, may limit the amount of appreciation the Trust can realize on an investment and/or may result in lower distributions paid to shareholders. The Trust’s investments in these instruments, if any, are discussed in detail in the Notes to Financial Statements.

THE BENEFITS AND RISKS OF LEVERAGING / DERIVATIVE FINANCIAL INSTRUMENTS 5

Trust Summary  as of July 31, 2020 BlackRock Taxable Municipal Bond Trust

Trust Overview

BlackRock Taxable Municipal Bond Trust’s (BBN) (the “Trust”) primary investment objective is to seek high current income, with a secondary objective of capital appreciation. The Trust seeks to achieve its investment objectives by investing primarily in a portfolio of taxable municipal securities, including Build America Bonds (“BABs”), issued by state and local governments to finance capital projects such as public schools, roads, transportation infrastructure, bridges, ports and public buildings.

The Trust originally sought to achieve its investment objectives by investing primarily in a portfolio of BABs, which are taxable municipal securities issued pursuant to the American Recovery and Reinvestment Act of 2009. Given the uncertainty around the BABs program at the time of the Trust’s launch in 2010, the Trust’s initial public offering prospectus included a Contingent Review Provision. For any 24-month period, if there were no new issuances of BABs or other analogous taxable municipal securities, the Board of Trustees (the “Board”) would undertake an evaluation of potential actions with respect to the Trust. Under the Contingent Review Provision, such potential action may include changes to the Trust’s non-fundamental investment policies to broaden its primary investment focus to include taxable municipal securities generally. The BABs program expired on December 31, 2010 and was not renewed. Accordingly, there have been no new issuances of BABs since that date.

Pursuant to the Contingent Review Provision, on June 12, 2015, the Board approved a proposal to amend the Trust’s investment policy from “Under normal market conditions, the Trust invests at least 80% of its managed assets in BABs” to “Under normal market conditions, the Trust invests at least 80% of its managed assets in taxable municipal securities, which include BABs”, and to change the name of the Trust from “BlackRock Build America Bond Trust” to “BlackRock Taxable Municipal Bond Trust.” These changes became effective on August 25, 2015.

The Trust continues to maintain its other investment policies, including its ability to invest up to 20% of its managed assets in securities other than taxable municipal securities. Such other securities may include tax-exempt securities, U.S. Treasury securities, obligations of the U.S. Government, its agencies and instrumentalities and corporate bonds issued by issuers that have, in the Manager’s view, typically been associated with or sold in the municipal market. Bonds issued by private universities and hospitals or bonds sold to finance military housing developments are examples of such securities. The Trust also continues to invest at least 80% of its managed assets in securities that at the time of purchase are investment grade quality.

As used herein, “managed assets” means the total assets of the Trust (including any assets attributable to money borrowed for investment purposes) minus the sum of the Trust’s accrued liabilities (other than money borrowed for investment purposes).

As of July 31, 2020, 67% of the Trust’s portfolio are BABs. Like other taxable municipal securities, interest received on BABs is subject to U.S. tax and may be subject to state income tax. Issuers of direct pay BABs, however, are eligible to receive a subsidy from the U.S. Treasury of up to 35% of the interest paid on the BABs. This allowed such issuers to issue bonds that pay interest rates that were expected to be competitive with the rates typically paid by private bond issuers in the taxable fixed income market. While the U.S. Treasury subsidizes the interest paid on BABs, it does not guarantee the principal or interest payments on BABs, and there is no guarantee that the U.S. Treasury will not reduce or eliminate the subsidy for BABs in the future. Any interruption, delay, reduction and/or offset of the reimbursement from the U.S. Treasury may reduce the demand for direct pay BABs and/or potentially trigger extraordinary call features of the BABs. As of the date of this report, the subsidy that issuers of direct pay BABs receive from the U.S. Treasury has been reduced from its original level as the result of budgetary sequestration. The extraordinary call features of some BABs permit early redemption at par value, and the reduction in the subsidy issuers of direct pay BABs receive from the U.S. Treasury has resulted, and may continue to result, in early redemptions of some BABs at par value. Such early redemptions at par value may result in a potential loss in value for investors of such BABs, who may have purchased the securities at prices above par, and may require such investors to reinvest redemption proceeds in lower-yielding securities. As of the date of this report, the Trust did not own any BABs subject to a par value extraordinary call feature. Additionally, many BABs also have more typical call provisions that permit early redemption at a stated spread to an applicable prevailing U.S. Treasury rate. Early redemptions in accordance with these call provisions may likewise result in potential losses for the Trust and give rise to reinvestment risk, which could reduce the Trust’s income and distributions.

No assurance can be given that the Trust’s investment objectives will be achieved.

Trust Information

Symbol on New York Stock Exchange (“NYSE”)	BBN
Initial Offering Date	August 27, 2010
Current Distribution Rate on Closing Market Price as of July 31, 2020 ($26.60)(a)	5.04%
Current Monthly Distribution per Common Share(b)	$0.1118
Current Annualized Distribution per Common Share(b)	$1.3416
Leverage as of July 31, 2020(c)	33%

^(a)  Current Distribution Rate on closing market price is calculated by dividing the current annualized distribution per share by the closing market price. The current distribution rate may consist of income, net realized gains and/or a return of capital. Past performance does not guarantee future results.

^(b)  The distribution rate is not constant and is subject to change.

^(c)  Represents reverse repurchase agreements as a percentage of total managed assets, which is the total assets of the Trust (including any assets attributable to borrowings) minus the sum of accrued liabilities (other than borrowings representing financial leverage). Does not reflect derivatives or other instruments that may give rise to economic leverage. For a discussion of leveraging techniques utilized by the Trust, please see The Benefits and Risks of Leveraging and Derivative Financial Instruments on page 5.

6 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Trust Summary  as of July 31, 2020 (continued) BlackRock Taxable Municipal Bond Trust

Taxable Municipal Bond Overview

Taxable municipal bonds typically trade at a spread (or additional yield) relative to U.S. Treasury bonds with similar maturities, but otherwise they generally track Treasuries’ price movements. U.S. Treasury yields decreased significantly (as prices rose) during the reporting period. With this favorable interest rate backdrop, the Bloomberg Barclays Taxable Municipal: U.S. Aggregate Eligible Index returned 15.01% for the 12-month period ended July 31, 2020.

Yield spreads on taxable municipal bonds finished the period markedly wider at the broad index level, which was a headwind for market performance. (Prices decrease as spreads rise.) The widening of yield spreads was driven primarily by the COVID-19 pandemic given that large parts of the world economy were shut down in an effort to contain the outbreak. These developments had a substantial impact on the markets in the form of high volatility and elevated selling pressure. Taxable municipal bond spreads widened significantly in March 2020 as a result, with an increase as much as 150 basis points (1.50%) at the index level. The effects were especially pronounced in the transportation and health care sectors, as well as for many tax-backed credits. After the Fed acted to support the economy and restore market functioning through a number of different programs, markets started to regain their footing and spreads retraced some of the widening. Liquidity conditions did not fully return to normal, however, and lower-quality issues — while rebounding — continued to lag on a relative basis.

As the markets began to function more normally again, taxable municipal bond supply returned to robust levels. The increase in supply is attributable to the combination of very low absolute interest rates and changes to the tax code from the Tax Cuts and Jobs Act of 2017. The new tax rules prevent municipalities from advance-refunding their previously issued tax-exempt debt with additional tax-exempt debt. However, due to the large drop in interest rates, municipalities found it advantageous to sell taxable municipal debt to advance-refund their outstanding tax-exempt securities. This practice grew rapidly starting in August 2019, and it remained at a high level through the close of the period (with the exception of March). Issuers also responded to the COVID-19 pandemic by turning to the taxable municipal market to bolster their balance sheets in a quick fashion, adding to the surge in supply. Investors at first appeared apprehensive that there would be sufficient demand to meet the higher supply. Still, demand remained resilient throughout the period (except during the March to early April 2020 timeframe) as the appeal of taxable municipal debt has widened in recent years to a much broader audience, especially overseas. Increased issuance also created the opportunity for investors to diversify by purchasing the debt of issuers that had either not previously issued taxable bonds or that had not in been in the market for several years.

Performance

Returns for the 12 months ended July 31, 2020 were as follows:

	Returns Based On
	Market Price			NAV
BBN(a)(b)		17.68	%		10.73	%
Lipper General Bond Funds(c)		(1.11	)		(1.89	)
Bloomberg Barclays Taxable Municipal: U.S. Aggregate Eligible Index(d)		N/A			15.01

^(a)  All returns reflect reinvestment of dividends and/or distributions at actual reinvestment prices.

^(b)  The Trust moved from a discount to NAV to a premium during the period, which accounts for the difference between performance based on market price and performance based on NAV.

^(c) Average return. Returns reflect reinvestment of dividends and/or distributions at NAV on the ex-dividend date as calculated by Lipper.

^(d) An unlevered index.

N/A — Not applicable as the index does not have a market price.

Performance results may include adjustments made for financial reporting purposes in accordance with U.S. generally accepted accounting principles.

Past performance is no guarantee of future results.

The following discussion relates to the Trust’s absolute performance based on NAV:

The Trust’s use of leverage contributed to performance by enhancing income and amplifying the effect of rising prices. Holdings in bonds on the longer end of the yield curve (ten years and above) were positive, as this area experienced the strongest price appreciation. An allocation to higher-quality securities, which held up relatively well in the sell-off, further boosted performance. The Trust gained an additional benefit from its holdings in Puerto Rico Sales Tax securities.

The Trust sought to manage interest rate risk using U.S. Treasury futures. Because Treasury yields fell, as prices rose, this strategy detracted from performance. Security selection in the state tax-backed, local tax-backed and education sectors also detracted, as did holdings in lower-rated issues.

The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results.

Market Price and Net Asset Value Per Share Summary

	07/31/20		07/31/19		Change			High		Low
Market Price	$	26.60	$	23.89		11.34	%	$	26.89	$	18.58
Net Asset Value		25.48		24.32		4.77			27.97		22.57

TRUST SUMMARY 7

Trust Summary  as of July 31, 2020 (continued) BlackRock Taxable Municipal Bond Trust

Market Price and Net Asset Value History For the Past Five Years

Overview of the Trust’s Total Investments*

SECTOR ALLOCATION

Sector	07/31/20			07/31/19
Utilities		22	%		27	%
Transportation		21			21
County/City/Special District/School District		19			17
Education		16			13
State		12			11
Tobacco		4			5
Health		2			—
Health Care Providers & Services		2			4
Housing		1			1
Corporate		1			1
Diversified Financial Services		—	(a)		—

^(a)  Represents less than 1% of the Trust’s total investments.

For Trust compliance purposes, the Trust’s sector classifications refer to one or more of the sector sub-classifications used by one or more widely recognized market indexes or rating group indexes, and/or as defined by the investment adviser. These definitions may not apply for purposes of this report, which may combine such sector sub-classifications for reporting ease.

CALL/MATURITY SCHEDULE ^(c)

	Percent of Total Investments
Calendar Year Ended December 31,
2020		9	%
2021		3
2022		—	(a)
2023		—	(a)
2024		1

^(c)  Scheduled maturity dates and/or bonds that are subject to potential calls by issuers over the next five years.

* Excludes short-term securities.

CREDIT QUALITY ALLOCATION ^(b)

Credit Rating	07/31/20			07/31/19
AAA/Aaa		3	%		3	%
AA/Aa		40			47
A		39			28
BBB/Baa		8			11
BB/Ba		2			—
B		4			5
C		—			1
N/R		4			5

^(b)  For financial reporting purposes, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service (“Moody’s”) if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.

8 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Schedule of Investments July 31, 2020 BlackRock Taxable Municipal Bond Trust (BBN) (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Corporate Bonds — 6.8%
Diversified Financial Services — 0.2%
Western Group Housing LP, 6.75%, 03/15/57(a)(b)	$	2,458	$	3,515,204
Education — 3.5%
George Washington University, Series 2018, 4.13%, 09/15/48		7,191		9,750,764
Rensselaer Polytechnic Institute, Series 2018, 5.25%, 09/01/48(b)		20,000		26,583,036
Wesleyan University, 4.78%, 07/01/16(b)		11,000		13,918,372
				50,252,172
Health Care Providers & Services — 3.1%
Baptist Health Obligated Group, Series 2019, 4.10%, 12/01/49		14,900		15,559,147
Common Spirit Health, 3.82%, 10/01/49		7,750		8,735,391
Ochsner Clinic Foundation, 5.90%, 05/15/45		5,000		6,693,866
Peace Health Obligated Group, Series 2018, 4.79%, 11/15/48		5,065		6,960,306
Tower Health, 4.45%, 02/01/50		8,162		7,630,211
				45,578,921
Total Corporate Bonds — 6.8% (Cost — $82,269,981)				99,346,297
Municipal Bonds — 141.2%
Arizona — 2.4%
Salt River Project Agricultural Improvement & Power District, RB, Build America Bonds, Series A, 4.84%, 01/01/41(b)		24,545		35,049,033
California — 25.8%
Bay Area Toll Authority, RB, Build America Bonds, San Francisco Toll Bridge:
Series S-1, 6.92%, 04/01/40(b)		13,700		21,941,646
Series S-1, 7.04%, 04/01/50		1,015		1,896,324
Series S-3, 6.91%, 10/01/50(b)		14,000		26,696,180
City of Riverside, RB, Series A, 3.86%, 06/01/45		8,265		8,691,722
City of San Francisco California, Public Utilities Commission Water Revenue, RB, Build America Bonds, Sub-Series E, 6.00%, 11/01/40(b)		21,255		31,619,363
City of San Jose California, Refunding ARB, Norman Y Mineta San Jose International Airport SJC, Series B (AGM), 6.60%, 03/01/41(b)		10,000		10,259,900
County of Alameda California Joint Powers Authority, RB, Build America Bonds, Recovery Zone, Series A, 7.05%, 12/01/44		11,000		18,720,020
County of Orange California Local Transportation Authority, Refunding RB, Build America Bonds, Series A, 6.91%, 02/15/41(b)		5,000		7,821,150
County of Riverside California, RB, 3.82%, 02/15/38		11,450		13,130,860
County of Sonoma California, Refunding RB, Pension Obligation, Series A (GTD), 6.00%, 12/01/29(b)		13,785		16,751,946
Foothill-Eastern Transportation Corridor Agency, Refunding RB, Toll Road, Series A, 4.09%, 01/15/49		14,540		15,425,050
Inland Empire Tobacco Securitization Corp., Refunding RB, 3.68%, 06/01/38		9,425		9,934,233
Los Angeles Community College District California, GO, Build America Bonds, 6.60%, 08/01/42(b)		10,000		17,330,600
Palomar Community College District, GO, Build America Bonds, Series B-1, 7.19%, 08/01/45		7,500		7,500,000
Rancho Water District Financing Authority, RB, Build America Bond, Series A, 6.34%, 08/01/40(b)(c)		165		165,000

Security	Par (000)		Value
California (continued)
San Diego County Regional Airport Authority, ARB, Consolidated Rental Car Facility Project, Series B, 5.59%, 07/01/43	$	4,000	$	4,234,520
State of California, GO, Build America Bonds:
7.55%, 04/01/39		9,035		16,366,631
7.60%, 11/01/40		15,000		28,066,800
Various Purpose, 7.63%, 03/01/40		8,950		16,068,293
State of California Public Works Board, RB, Build America Bonds, Series G-2, 8.36%, 10/01/34		18,145		29,928,000
University of California, RB, Build America Bonds(b):
5.95%, 05/15/45		24,000		35,872,320
6.30%, 05/15/50		27,010		37,088,241
				375,508,799
Colorado — 3.6%
City & County of Denver Colorado School District No. 1, COP, Refunding, Denver Colorado Public Schools, Series B, 7.02%, 12/15/37		6,000		9,430,560
Regional Transportation District, COP, Build America Bonds, Series B, 7.67%, 06/01/40(b)		23,000		38,262,800
State of Colorado, COP, Build America Bonds, Building Excellent Schools, Series E, 7.02%, 03/15/21(c)		5,000		5,204,550
				52,897,910
Connecticut — 0.3%
Connecticut State Health & Educational Facilities Authority, Refunding RB, Series G-2, 4.25%, 07/01/27(a)		5,055		5,035,589
District of Columbia — 3.3%
Metropolitan Washington Airports Authority Dulles Toll Road Revenue, ARB, Build America Bonds:
Series D, 8.00%, 10/01/47		10,750		16,711,950
Dulles Toll Road Revenue, 7.46%, 10/01/46		9,235		16,143,426
Washington Convention & Sports Authority, Refunding RB, Series C, 7.00%, 10/01/20(c)		15,000		15,150,750
				48,006,126
Florida — 5.7%
City of Sunrise Florida Utility System, Refunding RB, Build America Bonds, Series B, 5.91%, 10/01/20(b)(c)		23,000		23,191,820
County of Miami-Dade Florida Educational Facilities Authority, Refunding RB, Series B, 5.07%, 04/01/50		12,250		15,469,300
Excelsior Academies Inc, RB, Series C, 5.25%, 11/01/25		640		644,941
Florida Development Finance Corp., RB, Midtown Campus Properties, 7.00%, 12/01/48(a)		4,500		4,212,315
Florida Development Finance Corp., Refunding RB, Nova South Eastern University Project, 4.11%, 04/01/50		15,000		15,542,850
Miami-Dade County Industrial Development Authority, RB, Excelsior Charter Academy Project, 5.25%, 11/01/25		255		256,958
Sumter Landing Community Development District, RB, Taxable Senior Recreational, Series 2016, 4.17%, 10/01/47		2,575		2,972,941
Town of Davie Florida Water & Sewer, RB, Build America Bonds, Series B (AGM), 6.85%, 10/01/20(c)		2,500		2,524,550
Village Center Community Development District, Refunding RB, 5.02%, 11/01/36		13,500		17,505,180
				82,320,855
Georgia — 6.4%
Municipal Electric Authority of Georgia, Refunding RB, Build America Bonds, Series A:
6.64%, 04/01/57		26,656		40,525,117
6.66%, 04/01/57		24,635		37,974,852
7.06%, 04/01/57		9,851		14,624,401
				93,124,370

SCHEDULE OF INVESTMENTS 9

Schedule of Investments  (continued) July 31, 2020 BlackRock Taxable Municipal Bond Trust (BBN) (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Hawaii — 2.1%
University of Hawaii, RB, Build America Bonds, Series B-1, 6.03%, 10/01/40(b)	$	30,500	$	30,736,375
Idaho — 0.1%
Idaho Housing & Finance Association, RB, Hayden Canyon Charter School Project, Series B, 7.15%, 06/15/31		980		886,763
Illinois — 18.0%
Chicago Board of Education, GO:
Build America Bonds, 6.52%, 12/01/40		9,745		10,112,386
Taxable Build America Bonds, 6.04%, 12/01/29		12,935		13,234,186
Taxable Build America Bonds, 6.14%, 12/01/39		2,085		2,124,386
Taxable Qualified School Construction Bonds, 6.32%, 11/01/29		9,465		9,684,115
Chicago O’Hare International Airport, Refunding ARB, Build America Bonds, Series B:
O’Hare International Airport, General 3rd Lien, 6.85%, 01/01/38(b)		30,110		30,214,482
6.40%, 01/01/40		1,500		2,292,045
Chicago Transit Authority, RB:
Build America Bonds, Series B, 6.20%, 12/01/40(b)		16,015		22,104,223
Pension Funding, Series A, 6.90%, 12/01/40		4,075		5,762,417
Pension Funding, Series B, 6.90%, 12/01/40		4,900		6,929,041
City of Chicago Illinois, GO, Series B, 5.43%, 01/01/42		1,065		1,041,900
City of Chicago Illinois Wastewater Transmission, RB, Build America Bonds, Series B, 6.90%, 01/01/40(b)		36,000		51,697,800
City of Chicago Illinois Waterworks Transmission, RB, Build America Bonds, 2nd Lien, Series B, 6.74%, 11/01/40		15,250		22,314,410
Illinois Finance Authority, RB, Carle Foundation, Series A, 5.75%, 08/15/34		5,000		5,232,100
Illinois Municipal Electric Agency, RB, Build America Bonds, Series A, 7.29%, 02/01/35(b)		15,000		21,404,250
Northern Illinois Municipal Power Agency, RB, Build America Bonds, Prairie State Project, Series A, 7.82%, 01/01/40		5,000		8,198,050
State of Illinois, GO, Build America Bonds:
6.73%, 04/01/35		6,320		7,215,418
Pension, 7.35%, 07/01/35		35,855		42,152,931
				261,714,140
Indiana — 1.8%
Indiana Finance Authority, RB, Build America Bonds, Series B, 6.60%, 02/01/39		7,900		12,554,917
Indiana Municipal Power Agency, RB, Build America Bonds, Direct Payment, Series A, 5.59%, 01/01/42		10,000		13,804,300
				26,359,217
Kentucky — 1.2%
Westvaco Corp., RB, MeadWestvaco Corp., 7.67%, 01/15/27(a)		13,800		17,735,208
Louisiana — 0.3%
Louisiana Local Government Environmental Facilities & Community Development Authority, Refunding RB, East Baton Rouge Sewerage Commission Project, 2.59%, 02/01/43(d)		4,800		4,798,944
Maryland — 0.1%
Maryland Health & Higher Educational Facilities Authority, RB, Legends Charter School Project, Series B, 6.25%, 03/01/27(a)		1,000		939,510
Massachusetts — 0.5%
Commonwealth of Massachusetts Transportation Fund Revenue, RB, Build America Bonds, Recovery Zone, Series B, 5.73%, 06/01/40(b)		5,000		7,340,450

Security	Par (000)		Value
Michigan — 3.3%
Michigan Finance Authority, RB, Series D, 5.02%, 11/01/43	$	7,500	$	9,673,725
Michigan State University, RB, Build America Bonds, General, Series A, 6.17%, 02/15/50		5,500		7,076,465
Michigan State University, Refunding RB, Taxable, Series A, 4.50%, 08/15/48		14,575		16,808,473
Michigan Tobacco Settlement Finance Authority, RB, Capital Appreciation Turbo Term Bonds, Series A, 7.31%, 06/01/34		14,580		14,834,129
				48,392,792
Minnesota — 1.4%
Southern Minnesota Municipal Power Agency, Refunding RB, Build America Bonds, Series A, 5.93%, 01/01/43		8,000		11,948,720
Western Minnesota Municipal Power Agency, RB, Build America Bonds, Series C, 6.77%, 01/01/46		5,000		8,378,600
				20,327,320
Mississippi — 0.5%
Mississippi Development Bank, RB, Build America Bonds, Garvee, Series B, 6.41%, 01/01/40		5,000		7,595,250
Missouri — 1.9%
Missouri Joint Municipal Electric Utility Commission, RB, Build America Bonds, Plum Point Project, Series A, 7.73%, 01/01/39		11,000		17,367,130
University of Missouri, RB, Build America Bonds, Curators of the University, Series A, 5.79%, 11/01/41(b)		7,000		11,030,180
				28,397,310
Nevada — 0.4%
City of North Las Vegas Nevada, GO, Build America Bonds, 6.57%, 06/01/40		1,420		2,101,529
County of Clark Nevada Department of Aviation, ARB, Build America Bonds, Series C, 6.82%, 07/01/45		2,000		3,208,180
				5,309,709
New Hampshire — 0.4%
New Hampshire Business Finance Authority, Refunding RB, VA Kernersville Health Care Center Project, 2.87%, 07/01/35		5,100		5,301,348
New Jersey — 12.4%
County of Camden Improvement Authority, LRB, Build America Bonds, Cooper Medical School of Rowan University Project, Series A, 7.75%, 07/01/34(b)		5,000		5,022,600
New Jersey EDA, RB, Series A (NPFGC), 7.43%, 02/15/29(b)		20,974		26,095,641
New Jersey Educational Facilities Authority, Refunding RB, The College of New Jersey Issue, 3.51%, 07/01/42		20,000		20,471,000
New Jersey State Housing & Mortgage Finance Agency, RB, M/F Housing, Series C (AGM), 6.65%, 11/01/44		14,360		14,387,715
New Jersey Transportation Trust Fund Authority, RB, Build America Bonds, Series C, 5.75%, 12/15/28		4,500		4,920,030
New Jersey Transportation Trust Fund Authority, Refunding RB, Transportation System, 4.13%, 06/15/42		29,355		29,448,055
State of New Jersey Turnpike Authority, RB, Build America Bonds:
Series A, 7.10%, 01/01/41(b)		34,000		58,376,640
Series F, 7.41%, 01/01/40		6,790		11,966,017
The State of Rutgers University of New Jersey, RB, Rutgers University, Series P, 3.92%, 05/01/19		7,275		9,745,881
				180,433,579
New York — 11.4%
City of New York, GO, Build America Bonds, Series H-1, 6.25%, 06/01/35		5,000		5,017,300

10 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Schedule of Investments  (continued) July 31, 2020 BlackRock Taxable Municipal Bond Trust (BBN) (Percentages shown are based on Net Assets)

Security	Par (000)		Value
New York (continued)
City of New York Transitional Finance Authority Future Tax Secured Revenue, RB, Build America Bonds, Future Tax Secured, Sub-Series B-1, 5.57%, 11/01/38(b)	$	19,000	$	26,396,510
County of Nassau New York Tobacco Settlement Corp., Refunding RB, Asset Backed, Series A-1, 6.83%, 06/01/21		8,250		8,265,604
Metropolitan Transportation Authority, RB:
Build America Bond, 7.13%, 11/15/30		15,000		15,104,850
Build America Bonds, 6.67%, 11/15/39		2,220		2,887,177
Build America Bonds, 7.34%, 11/15/39(b)		13,245		21,669,482
Build America Bonds, Series C-1, 6.69%, 11/15/40(b)		13,000		16,746,210
Metropolitan Transportation Authority, Refunding RB, Green Bond, Series C-2, 5.18%, 11/15/49		4,370		5,112,987
New York City Transitional Finance Authority Future Tax Secured Revenue, RB, Build America Bonds, Future Tax Secured, Sub-Series B-1, 5.93%, 11/01/36(b)		6,060		6,136,659
Port Authority of New York & New Jersey, ARB:
192nd Series, 4.81%, 10/15/65		14,825		21,297,299
Consolidated, 160th Series, 5.65%, 11/01/40		2,750		3,967,343
Consolidated, 168th Series, 4.93%, 10/01/51		3,860		5,514,550
State of New York Dormitory Authority, RB, Build America Bonds, General Purpose, Series H, 5.39%, 03/15/40(b)		15,000		21,212,250
State of New York Dormitory Authority, Refunding RB, Touro College & University, Series B, 5.75%, 01/01/29		6,010		6,656,255
				165,984,476
Ohio — 7.4%
American Municipal Power, Inc., RB, Build America Bonds, Combined Hydroelectric Projects, Series B, 7.83%, 02/15/41		10,000		16,696,600
American Municipal Power, Inc., Refunding RB, Build America Bonds, Series B, 6.45%, 02/15/44		10,000		14,948,300
County of Franklin Ohio Convention Facilities Authority, RB, Build America Bonds, 6.64%, 12/01/42(b)		30,575		49,884,335
Mariemont City School District, GO, Refunding, Build America Bonds, Series B, 6.55%, 12/01/20(b)(c)		10,055		10,266,155
Ohio University, RB, General Receipts, Athens, 5.59%, 12/01/14		10,100		15,693,380
				107,488,770
Oklahoma — 0.4%
Oklahoma Municipal Power Authority, RB, Build America Bonds, 6.44%, 01/01/45(b)		3,500		5,342,645
Pennsylvania — 4.0%
Commonwealth Financing Authority, RB, Series A:
Plancon Program, 3.86%, 06/01/38		2,210		2,631,425
Taxable Bond, 3.81%, 06/01/41		4,920		5,735,441
4.14%, 06/01/38		6,200		7,608,702
Pennsylvania Economic Development Financing Authority, RB, Build America Bonds, Series B, 6.53%, 06/15/39		23,050		32,174,573
Temple University-of The Commonwealth System of Higher Education, Refunding RB, First Series of 2020, 3.08%, 04/01/40		10,000		10,364,700
				58,514,841
Puerto Rico — 2.8%
Puerto Rico Commonwealth Aqueduct & Sewer Authority, Refunding RB, Senior Lien, Series B:
5.00%, 07/01/23		3,365		3,254,729
5.35%, 07/01/27		18,075		17,005,141
6.15%, 07/01/38		2,160		2,024,741

Security	Par (000)		Value
Puerto Rico (continued)
Puerto Rico Sales Tax Financing Corp. Sales Tax Revenue, RB, Restructured, Series A-2:
4.33%, 07/01/40	$	5,000	$	5,200,550
4.78%, 07/01/58		12,447		13,255,432
				40,740,593
South Carolina — 2.6%
South Carolina Public Service Authority, RB, Series F (AGM):
Build America Bonds, 6.45%, 01/01/50		11,290		18,050,000
Santee Cooper, 5.74%, 01/01/30		5,000		6,082,300
South Carolina Public Service Authority, Refunding RB, Series D, 4.77%, 12/01/45		10,085		13,430,094
				37,562,394
Tennessee — 4.0%
County of Memphis-Shelby Tennessee Industrial Development Board, Refunding, Tax Allocation Bonds, Subordinate Tax Increment, Series C, 7.00%, 07/01/45		5,800		5,975,856
Metropolitan Government of Nashville & Davidson County Convention Center Authority, RB, Build America Bonds, Series A2, 7.43%, 07/01/43(b)		35,105		52,938,691
				58,914,547
Texas — 4.2%
City of Austin Texas, RB, Travis, Williams and Hays Counties, Rental Car Specialty Facilities, 5.75%, 11/15/42		5,000		5,299,250
City of San Antonio Texas Customer Facility Charge Revenue, RB, 5.87%, 07/01/45(b)		7,500		8,516,850
Dallas Area Rapid Transit, RB, Build America Bonds, Senior Lien, Series B, 5.02%, 12/01/48		2,500		3,843,725
Dallas-Fort Worth International Airport, Refunding RB, Series C, 3.09%, 11/01/40(d)		10,155		10,251,371
North Texas Municipal Water District, RB, Build America Bonds, Series A, 6.01%, 09/01/40(b)		10,000		10,043,100
Port Beaumont Navigation District, Refunding RB, Jefferson Gulf Coast, Series B, 6.00%, 01/01/25(a)		1,085		1,090,598
Texas Private Activity Bond Surface Transportation Corp., RB, North Tarrant Express Managed Lanes Project, Series B, 3.92%, 12/31/49		20,000		22,061,200
				61,106,094
Utah — 2.4%
Utah Transit Authority, RB, Build America Bonds, Subordinated, 5.71%, 06/15/40(b)		26,405		35,463,763
Virginia — 3.2%
Tobacco Settlement Financing Corp., Refunding RB, Series A-1, 6.71%, 06/01/46		31,990		32,073,814
Virginia Housing Development Authority, RB:
M/F Housing, Rental Housing Bonds, Series D, 3.64%, 06/01/45		8,435		9,129,538
Series F, 3.13%, 07/01/45		5,000		5,211,000
				46,414,352
Washington — 2.2%
Washington State Convention Center Public Facilities District, RB, Build America Bonds, Series B, 6.79%, 07/01/40		26,100		32,526,864
West Virginia — 3.9%
West Virginia Tobacco Settlement Finance Authority, RB, Series A, 7.47%, 06/01/47		29,400		30,647,442
West Virginia United Health System Obligated Group, Series 2018, 4.92%, 06/01/48		20,000		25,613,523
				56,260,965

SCHEDULE OF INVESTMENTS 11

Schedule of Investments  (continued) July 31, 2020 BlackRock Taxable Municipal Bond Trust (BBN) (Percentages shown are based on Net Assets)

Security	Par (000)		Value
Wisconsin — 0.8%
Public Finance Authority, RB:
Affinity Living Group, 6.75%, 11/01/24(a)	$	3,580	$	3,468,734
Seattle Proton Center, Series A, 7.55%, 12/01/30(a)		1,470		1,511,851
Seattle Proton Center, Series A, 7.63%, 12/01/48(a)		5,310		5,090,431
Series B, 6.00%, 06/15/24		435		435,065
Public Finance Authority, Refunding RB, Ultimate Medical Academy Project, Series B, 6.13%, 10/01/49(a)		1,470		1,412,229
				11,918,310
Total Municipal Bonds — 141.2% (Cost — $1,602,924,886)				2,056,449,211
Total Long-Term Investments — 148.0% (Cost — $1,685,194,867)				2,155,795,508
	Shares
Short-Term Securities — 0.4%
BlackRock Liquidity Funds, T-Fund, Institutional Class, 0.08%(e)(f)		6,321,745		6,321,745
Total Short-Term Securities — 0.4% (Cost — $6,321,745)				6,321,745
Total Investments — 148.4% (Cost — $1,691,516,612)				2,162,117,253
Liabilities in Excess of Other Assets — (48.4)%				(705,313,070	)
Net Assets —100.0%			$	1,456,804,183

^(a)  Security exempt from registration pursuant to Rule 144A under the Securities Act of 1933, as amended. These securities may be resold in transactions exempt from registration to qualified institutional investors.

^(b)  All or a portion of the security has been pledged as collateral in connection with outstanding reverse repurchase agreements.

^(c)  U.S. Government securities held in escrow, are used to pay interest on this security as well as to retire the bond in full at the date indicated, typically at a premium to par.

^(d)  When-issued security.

^(e)  Annualized 7-day yield as of period end.

^(f)  Investments in issuers considered to be an affiliate/affiliates of the Trust during the year ended July 31, 2020 for purposes of Section 2(a)(3) of the Investment Company Act of 1940, as amended, were as follows:

Affiliated Issuer	Shares Held at 07/31/19		Shares Purchased			Shares Sold		Shares Held at 07/31/20		Value at 07/31/20		Income		Net Realized Gain (Loss) (a)		Change in Unrealized Appreciation (Depreciation)
BlackRock Liquidity Funds, T-Fund, Institutional Class		5,709,848		611,897	(b)		—		6,321,745	$	6,321,745	$	168,272	$	71	$	—

^(a)  Includes net capital gain distributions, if applicable.

^(b)  Represents net shares purchased (sold).

For Trust compliance purposes, the Trust’s sector classifications refer to one or more of the sector sub-classifications used by one or more widely recognized market indexes or rating group indexes, and/or as defined by the investment adviser. These definitions may not apply for purposes of this report, which may combine such sector sub-classifications for reporting ease.

Reverse Repurchase Agreements

Counterparty

Interest Rate (a)

Trade Date

Maturity Date (b)

Face Value

Face Value Including Accrued Interest

Type of Non-Cash Underlying Collateral

Remaining Contractual Maturity of the Agreements (a)

RBC Capital Markets LLC

1.15

%

08/27/19

Open

$

7,400,000

$

7,527,927

Municipal Bonds

Open/Demand

RBC Capital Markets LLC

1.15

08/28/19

Open

31,233,513

31,797,191

Municipal Bonds

Open/Demand

RBC Capital Markets LLC

1.15

08/28/19

Open

28,773,956

29,293,246

Municipal Bonds

Open/Demand

RBC Capital Markets LLC

1.15

08/28/19

Open

33,000,000

33,595,558

Municipal Bonds

Open/Demand

RBC Capital Markets LLC

1.15

08/28/19

Open

35,580,000

36,222,120

Municipal Bonds

Open/Demand

RBC Capital Markets LLC

1.15

08/28/19

Open

42,280,000

43,043,037

Municipal Bonds

Open/Demand

RBC Capital Markets LLC

1.15

12/19/19

Open

3,617,875

3,654,476

Municipal Bonds

Open/Demand

Barclays Bank PLC

1.05

03/10/20

Open

1,145,681

1,150,827

Municipal Bonds

Open/Demand

Barclays Bank PLC

1.05

03/10/20

Open

1,775,569

1,783,544

Municipal Bonds

Open/Demand

Barclays Bank PLC

1.05

03/10/20

Open

1,342,500

1,348,530

Municipal Bonds

Open/Demand

Barclays Bank PLC

1.10

04/08/20

Open

5,443,750

5,462,879

Municipal Bonds

Open/Demand

Barclays Bank PLC

1.15

04/08/20

Open

9,036,931

9,070,129

Municipal Bonds

Open/Demand

Barclays Bank PLC

1.50

04/15/20

Open

11,935,000

11,988,210

Corporate Bonds

Open/Demand

Barclays Bank PLC

1.65

04/15/20

Open

20,010,000

20,108,132

Municipal Bonds

Open/Demand

12 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Schedule of Investments  (continued) July 31, 2020 BlackRock Taxable Municipal Bond Trust (BBN)

Reverse Repurchase Agreements (continued)

Counterparty

Interest Rate (a)

Trade Date

Maturity Date (b)

Face Value

Face Value Including Accrued Interest

Type of Non-Cash Underlying Collateral

Remaining Contractual Maturity of the Agreements (a)

Barclays Bank PLC

1.65

%

04/15/20

Open

$

143,756

$

144,461

Municipal Bonds

Open/Demand

RBC Capital Markets LLC

1.80

05/05/20

Open

13,640,000

13,699,334

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.60

05/19/20

Open

3,268,750

3,272,727

Corporate Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.67

05/19/20

Open

27,579,000

27,616,469

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.67

05/19/20

Open

2,769,000

2,772,762

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.67

05/19/20

Open

21,147,000

21,175,731

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.67

05/19/20

Open

20,634,000

20,662,034

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.67

05/19/20

Open

31,000,000

31,042,117

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.67

05/19/20

Open

31,774,500

31,817,669

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.67

05/19/20

Open

17,032,500

17,055,640

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.67

05/19/20

Open

8,745,000

8,756,881

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.67

05/19/20

Open

16,897,500

16,920,457

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.67

05/19/20

Open

7,987,500

7,998,352

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.67

05/19/20

Open

48,603,000

48,669,033

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.67

05/19/20

Open

9,785,000

9,798,294

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.72

05/19/20

Open

4,578,000

4,584,684

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.72

05/19/20

Open

9,535,000

9,548,921

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.72

05/19/20

Open

38,646,000

38,702,423

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.72

05/19/20

Open

24,882,000

24,918,328

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.72

05/19/20

Open

4,820,000

4,827,037

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.72

05/19/20

Open

6,447,500

6,456,913

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.72

05/19/20

Open

14,683,500

14,704,938

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.67

05/20/20

Open

21,161,000

21,189,750

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.67

05/20/20

Open

18,382,660

18,407,635

Municipal Bonds

Open/Demand

Mitsubishi UFJ Securities (USA) Inc.

0.67

05/20/20

Open

9,604,700

9,617,749

Municipal Bonds

Open/Demand

Barclays Bank PLC

0.65

06/25/20

Open

16,387,500

16,398,448

Municipal Bonds

Open/Demand

RBC Capital Markets LLC

1.15

06/29/20

Open

16,111,219

16,127,688

Municipal Bonds

Open/Demand

RBC Capital Markets LLC

1.15

06/29/20

Open

5,885,775

5,891,792

Municipal Bonds

Open/Demand

RBC Capital Markets LLC

1.15

06/29/20

Open

15,962,500

15,978,817

Municipal Bonds

Open/Demand

RBC Capital Markets LLC

1.15

06/29/20

Open

7,243,750

7,251,155

Municipal Bonds

Open/Demand

$

707,912,385

$

712,054,045

^(a)  Variable rate security. Rate as of period end and maturity is the date the principal owed can be recovered through demand.

^(b)  Certain agreements have no stated maturity and can be terminated by either party at any time.

Derivative Financial Instruments Outstanding as of Period End

Futures Contracts

Description	Number of Contracts		Expiration Date		Notional Amount (000)		Value / Unrealized Appreciation (Depreciation)
Short Contracts
10-Year U.S. Treasury Note		380		09/21/20	$	53,230	$	(226,146	)
Long U.S. Treasury Bond		325		09/21/20		59,241		(640,305	)
							$	(866,451	)

Derivative Financial Instruments Categorized by Risk Exposure

As of period end, the fair values of derivative financial instruments located in the Statement of Assets and Liabilities were as follows :

	Commodity Contracts		Credit Contracts		Equity Contracts		Foreign Currency Exchange Contracts		Interest Rate Contracts		Other Contracts		Total
Liabilities — Derivative Financial Instruments
Futures contracts
Unrealized depreciation on futures contracts(a) . . .	$	—	$	—	$	—	$	—	$	866,451	$	—	$	866,451

^(a)  Net cumulative unrealized appreciation (depreciation) on futures contracts and centrally cleared swaps, if any, are reported in the Schedule of Investments. In the Statement of Assets and Liabilities, only current day’s variation margin is reported in receivables or payables and the net cumulative unrealized appreciation (depreciation) is included accumulated earnings (loss).

SCHEDULE OF INVESTMENTS 13

Schedule of Investments  (continued) July 31, 2020 BlackRock Taxable Municipal Bond Trust (BBN)

Derivative Financial Instruments Categorized by Risk Exposure (continued)

For the year ended July 31, 2020, the effect of derivative financial instruments in the Statement of Operations was as follows:

	Commodity Contracts		Credit Contracts		Equity Contracts		Foreign Currency Exchange Contracts		Interest Rate Contracts			Other Contracts		Total
Net Realized Gain (Loss) from:
Futures contracts . . . . . . . . . . . . . . . . . . . . . . . . . . . .	$	—	$	—	$	—	$	—	$	(57,468,623	)	$	—	$	(57,468,623	)
Net Change in Unrealized Appreciation (Depreciation) on:
Futures contracts . . . . . . . . . . . . . . . . . . . . . . . . . . . .	$	—	$	—	$	—	$	—	$	4,242,897		$	—	$	4,242,897

Average Quarterly Balances of Outstanding Derivative Financial Instruments

Futures contracts:
Average notional value of contracts — long	$	—	(a)
Average notional value of contracts — short		227,278,078

^(a)  Derivative not held at any quarter-end. The risk exposure table serves as an indicator of activity during the period.

For more information about the Trust’s investment risks regarding derivative financial instruments, refer to the Notes to Financial Statements.

Fair Value Hierarchy as of Period End

Various inputs are used in determining the fair value of investments and derivative financial instruments. For information about the Trust’s policy regarding valuation of investments and derivative financial instruments, refer to the Notes to Financial Statements.

The following tables summarize the Trust’s investments and derivative financial instruments categorized in the disclosure hierarchy:

	Level 1			Level 2		Level 3		Total
Assets:
Investments:
Long-Term Investments	$	—		$	2,155,795,508	$	—	$	2,155,795,508
Short-Term Securities		6,321,745			—		—		6,321,745
	$	6,321,745		$	2,155,795,508	$	—	$	2,162,117,253
Derivative Financial Instruments (a)
Liabilities:
Interest rate contracts	$	(866,451	)	$	—	$	—	$	(866,451	)

^(a)  Derivative financial instruments are futures contracts. Futures contracts are valued at the unrealized appreciation (depreciation) on the instrument.

The breakdown of the Trust’s investments into major categories is disclosed in the Schedule of Investments above.

The Trust may hold assets and/or liabilities in which the fair value approximates the carrying amount or face value, including accrued interest, for financial statement purposes. As of period end, reverse repurchase agreements payable of $712,054,045 is categorized as Level 2 within the disclosure hierarchy.

See notes to financial statements.

14 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Statement of Assets and Liabilities

July 31, 2020

	BBN
ASSETS
Investments at value — unaffiliated (cost — $1,685,194,867)	$	2,155,795,508
Investments at value — affiliated (cost — $6,321,745)		6,321,745
Cash pledged for futures contracts		2,138,000
Receivables:
Dividends — affiliated		1,980
Interest — unaffiliated		21,420,816
Variation margin on futures contracts		10,156
Prepaid expenses		10,509
Total assets		2,185,698,714
LIABILITIES
Reverse repurchase agreements at value		712,054,045
Payables:
Investments purchased		14,955,000
Investment advisory fees		992,821
Trustees’ and Officer’s fees		502,712
Other accrued expenses		366,230
Variation margin on futures contracts		23,723
Total liabilities		728,894,531
NET ASSETS	$	1,456,804,183
NET ASSETS CONSIST OF
Paid-in capital	$	1,089,555,033
Accumulated earnings		367,249,150
NET ASSETS	$	1,456,804,183
NET ASSETS VALUE
Based on net assets of $1,456,804,183 and 57,165,244 shares outstanding, unlimited number of shares authorized, $0.001 par value	$	25.48

See notes to financial statements.

FINANCIAL STATEMENTS 15

Statement of Operations

Year Ended July 31, 2020

	BBN
INVESTMENT INCOME
Interest — unaffiliated	$	110,043,786
Dividends — affiliated		168,272
Total investment income		110,212,058
EXPENSES
Investment advisory		12,059,792
Accounting services		235,124
Professional		171,772
Trustees and Officer		103,406
Transfer agent		99,509
Custodian		35,187
Registration		20,890
Printing and postage		18,844
Miscellaneous		25,175
Total expenses excluding interest expense		12,769,699
Interest expense		14,914,798
Total expenses		27,684,497
Less fees waived and/or reimbursed by the Manager		(16,121	)
Total expenses after fees waived and/or reimbursed		27,668,376
Net investment income		82,543,682
REALIZED AND UNREALIZED GAIN (LOSS)
Net realized gain (loss) from:
Investments — unaffiliated		3,021,213
Capital gain distributions from underlying funds — affiliated		71
Futures contracts		(57,468,623	)
		(54,447,339	)
Net change in unrealized appreciation (depreciation) on:
Futures contracts		4,242,897
Investments — unaffiliated		111,052,540
		115,295,437
Net realized and unrealized gain		60,848,098
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS	$	143,391,780

See notes to financial statements.

16 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Statements of Changes in Net Assets

	BBN
	Year Ended July 31,
	2020			2019
INCREASE (DECREASE) IN NET ASSETS
OPERATIONS
Net investment income	$	82,543,682		$	79,054,250
Net realized loss		(54,447,339	)		(20,269,983	)
Net change in unrealized appreciation (depreciation)		115,295,437			95,732,061
Net increase in net assets resulting from operations		143,391,780			154,516,328
DISTRIBUTIONS TO SHAREHOLDERS(a)
From net investment income		(76,644,636	)		(80,316,892	)
From return of capital		—			(716,926	)
		(76,644,636	)		(81,033,818	)
CAPITAL SHARE TRANSACTIONS
Net increase in net assets derived from capital share transactions		1,053,928			—
NET ASSETS
Total increase in net assets		67,801,072			73,482,510
Beginning of year		1,389,003,111			1,315,520,601
End of year	$	1,456,804,183		$	1,389,003,111

^(a)  Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

See notes to financial statements.

FINANCIAL STATEMENTS 17

Statement of Cash Flows

Year Ended July 31, 2020

	BBN
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES
Net increase in net assets resulting from operations	$	143,391,780
Adjustments to reconcile net increase in net assets resulting from operations to net cash provided by operating activities:
Proceeds from sales of long-term investments		443,507,809
Purchases of long-term investments		(308,682,088	)
Net purchases of short-term securities		(611,897	)
Amortization of premium and accretion of discount on investments and other fees		(1,072,959	)
Net realized gain on investments		(3,021,213	)
Net unrealized appreciation on investments		(111,052,540	)
(Increase) Decrease in Assets:
Receivables:
Dividends — affiliated		27,170
Interest — unaffiliated		3,724,338
Variation margin on futures contracts		(4,218	)
Prepaid expenses		3,258
Increase (Decrease) in Liabilities:
Cash received for reverse repurchase agreements		(3,843,800	)
Payables:
Interest expense and fees		(4,766,181	)
Investment advisory fees		(21,900	)
Trustees’ and Officer’s fees		14,125
Other accrued expenses		(45,426	)
Variation margin on futures contracts		(1,744,371	)
Net cash provided by operating activities		155,801,887
CASH USED FOR FINANCING ACTIVITIES
Cash dividends paid to Common Shareholders		(75,767,734	)
Net borrowing of reverse repurchase agreements		(83,135,103	)
Net cash used for financing activities		(158,902,837	)
CASH
Net decrease in restricted and unrestricted cash		(3,100,950	)
Restricted and unrestricted cash at beginning of year		5,238,950
Restricted and unrestricted cash at end of year	$	2,138,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the year for interest expense	$	19,680,979
NON-CASH FINANCING ACTIVITIES
Capital shares issued in reinvestment of distributions paid to Common Shareholders		1,053,928

RECONCILIATION OF RESTRICTED AND UNRESTRICTED CASH TO THE STATEMENT OF ASSETS AND LIABILITIES

	7/31/2020		7/31/2019
Cash pledged:
Futures contracts		$2,138,000	$	5,238,950
		$2,138,000	$	5,238,950

See notes to financial statements.

18 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Financial Highlights

(For a share outstanding throughout each period)

	BBN
	Year Ended July 31,
	2020			2019			2018			2017			2016
Net asset value, beginning of year	$	24.32		$	23.03		$	23.45		$	25.02		$	22.48
Net investment income(a)		1.44			1.38			1.47			1.58			1.63
Net realized and unrealized gain (loss)		1.06			1.33			(0.32	)		(1.57	)		2.49
Net increase from investment operations		2.50			2.71			1.15			0.01			4.12
Distributions(b)
From net investment income		(1.34	)		(1.41	)		(1.57	)		(1.58	)		(1.58	)
From return of capital		—			(0.01	)		—			—			—
Total distributions		(1.34	)		(1.42	)		(1.57	)		(1.58	)		(1.58	)
Net asset value, end of year	$	25.48		$	24.32		$	23.03		$	23.45		$	25.02
Market price, end of year	$	26.60		$	23.89		$	21.99		$	23.29		$	24.43
Total Return(c)
Based on net asset value		10.73	%		12.60	%		5.23	%		0.45	%(d)		19.55	%
Based on market price		17.68	%		15.84	%		1.17	%		2.18	%		28.89	%
Ratios to Average Net Assets
Total expenses		1.97	%		2.53	%		2.03	%		1.52	%		1.32	%
Total expenses after fees waived and/or reimbursed		1.97	%		2.53	%		2.03	%		1.52	%		1.32	%
Total expenses after fees waived and/or reimbursed and excluding interest expense		0.91	%		0.93	%		0.91	%		0.92	%		0.92	%
Net investment income		5.88	%		6.02	%		6.27	%		6.79	%		7.08	%
Supplemental Data
Net assets, end of year (000)	$	1,456,804		$	1,389,003		$	1,315,521		$	1,339,058		$	1,428,924
Borrowings outstanding, end of year (000)	$	712,054		$	799,955		$	742,657		$	729,035		$	762,748
Portfolio turnover rate		15	%		7	%		8	%		7	%		10	%

^(a)  Based on average shares outstanding.

^(b)  Distributions for annual periods determined in accordance with U.S. federal income tax regulations.

^(c)  Total returns based on market price, which can be significantly greater or less than the net asset value, may result in substantially different returns. Where applicable, excludes the effects of any sales charges and assumes the reinvestment of distributions at actual reinvestment prices.

^(d)  The Trust’s total return includes a reimbursement by an affiliate for a realized investment loss. Excluding this payment, the Trust’s total return would have been 0.32%.

See notes to financial statements.

FINANCIAL HIGHLIGHTS 19

Notes to Financial Statements

1. ORGANIZATION

BlackRock Taxable Municipal Bond Trust (the “Trust”) is registered under the Investment Company Act of 1940, as amended (the “1940 Act”). The Trust is registered as a diversified, closed-end management investment company. The Trust is organized as a Delaware statutory trust. The Trust determines and makes available for publication the net asset value (“NAV”) of its Common Shares on a daily basis.

The Trust, together with certain other registered investment companies advised by BlackRock Advisors, LLC (the “Manager”) or its affiliates, is included in a complex of non-index fixed-income mutual funds and all BlackRock-advised closed-end funds referred to as the BlackRock Fixed-Income Complex.

2. SIGNIFICANT ACCOUNTING POLICIES

The financial statements are prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”), which may require management to make estimates and assumptions that affect the reported amounts of assets and liabilities in the financial statements, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of increases and decreases in net assets from operations during the reporting period. Actual results could differ from those estimates. The Trust is considered an investment company under U.S. GAAP and follows the accounting and reporting guidance applicable to investment companies. Below is a summary of significant accounting policies:

Investment Transactions and Income Recognition: For financial reporting purposes, investment transactions are recorded on the dates the transactions are executed. Realized gains and losses on investment transactions are determined on the identified cost basis. Dividend income and non-cash dividend income, if any, are recorded on the ex-dividend date. Interest income, including amortization and accretion of premiums and discounts on debt securities, is recognized on an accrual basis.

Segregation and Collateralization: In cases where the Trust enters into certain investments (e.g., futures contracts) or certain borrowings (e.g., reverse repurchase transactions) that would be treated as “senior securities” for 1940 Act purposes, the Trust may segregate or designate on its books and records cash or liquid assets having a market value at least equal to the amount of its future obligations under such investments or borrowings. Doing so allows the investment or borrowings to be excluded from treatment as a “senior security.” Furthermore, if required by an exchange or counterparty agreement, the Trust may be required to deliver/deposit cash and/ or securities to/with an exchange, or broker-dealer or custodian as collateral for certain investments or obligations.

Distributions: Distributions from net investment income are declared and paid monthly. Distributions of capital gains are recorded on the ex-dividend date and made at least annually. The portion of distributions, if any, that exceeds a fund’s current and accumulated earnings and profits, as measured on a tax basis, constitute a non-taxable return of capital. The character and timing of distributions are determined in accordance with U.S. federal income tax regulations, which may differ from U.S. GAAP.

Deferred Compensation Plan: Under the Deferred Compensation Plan (the “Plan”) approved by the Board of Trustees of the Trust (the “Board”), the trustees who are not “interested persons” of the Trust, as defined in the 1940 Act (“Independent Trustees”), may defer a portion of their annual complex-wide compensation. Deferred amounts earn an approximate return as though equivalent dollar amounts had been invested in common shares of certain funds in the BlackRock Fixed-Income Complex selected by the Independent Trustees. This has the same economic effect for the Independent Trustees as if the Independent Trustees had invested the deferred amounts directly in certain funds in the BlackRock Fixed-Income Complex.

The Plan is not funded and obligations thereunder represent general unsecured claims against the general assets of the Trust, as applicable. Deferred compensation liabilities are included in the Trustees’ and Officer’s fees payable in the Statement of Assets and Liabilities and will remain as a liability of the Trust until such amounts are distributed in accordance with the Plan.

Recent Accounting Standards: The Trust has adopted Financial Accounting Standards Board Accounting Standards Update 2017-08 to amend the amortization period for certain purchased callable debt securities held at a premium. Under the new standard, the Trust has changed the amortization period for the premium on certain purchased callable debt securities with non-contingent call features to the earliest call date. In accordance with the transition provisions of the standard, the Trust applied the amendments on a modified retrospective basis beginning with the fiscal period ended July 31, 2020. The adjusted cost basis of securities at July 31, 2019 is $1,806,681,264.

This change in accounting policy has been made to comply with the newly issued accounting standard and had no impact on accumulated earnings (loss) or the net asset value of the Trust.

Indemnifications: In the normal course of business, the Trust enters into contracts that contain a variety of representations that provide general indemnification. The Trust’s maximum exposure under these arrangements is unknown because it involves future potential claims against the Trust, which cannot be predicted with any certainty.

Other: Expenses directly related to the Trust are charged to the Trust. Other operating expenses shared by several funds, including other funds managed by the Manager, are prorated among those funds on the basis of relative net assets or other appropriate methods.

3. INVESTMENT VALUATION AND FAIR VALUE MEASUREMENTS

Investment Valuation Policies: The Trust’s investments are valued at fair value (also referred to as “market value” within the financial statements) as of the close of trading on the New York Stock Exchange (“NYSE”) (generally 4:00 p.m., Eastern time). U.S. GAAP defines fair value as the price the Trust would receive to sell an asset or pay to transfer a liability in an orderly transaction between market participants at the measurement date. The Trust determines the fair values of its financial instruments using various independent dealers or pricing services under policies approved by the Board. If a security’s market price is not readily available or does not otherwise accurately represent the fair value of the security, the security will be valued in accordance with a policy approved by the Board as reflecting fair value. The BlackRock

20 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Notes to Financial Statements  (continued)

Global Valuation Methodologies Committee (the “Global Valuation Committee”) is the committee formed by management to develop global pricing policies and procedures and to oversee the pricing function for all financial instruments.

Fair Value Inputs and Methodologies: The following methods and inputs are used to establish the fair value of the Trust’s assets and liabilities:

• Fixed-income securities for which market quotations are readily available are generally valued using the last available bid prices or current market quotations provided by independent dealers or third party pricing services. Floating rate loan interests are valued at the mean of the bid prices from one or more independent brokers or dealers as obtained from a third party pricing service. Pricing services generally value fixed-income securities assuming orderly transactions of an institutional round lot size, but a fund may hold or transact in such securities in smaller, odd lot sizes. Odd lots may trade at lower prices than institutional round lots. The pricing services may use matrix pricing or valuation models that utilize certain inputs and assumptions to derive values, including transaction data (e.g., recent representative bids and offers), credit quality information, perceived market movements, news, and other relevant information. Certain fixed-income securities, including asset-backed and mortgage related securities may be valued based on valuation models that consider the estimated cash flows of each tranche of the entity, establish a benchmark yield and develop an estimated tranche specific spread to the benchmark yield based on the unique attributes of the tranche. The amortized cost method of valuation may be used with respect to debt obligations with sixty days or less remaining to maturity unless the Manager determines such method does not represent fair value.

• Municipal investments (including commitments to purchase such investments on a “when-issued” basis) are valued on the basis of prices provided by dealers or pricing services. In determining the value of a particular investment, pricing services may use certain information with respect to transactions in such investments, quotations from dealers, pricing matrixes, market transactions in comparable investments and information with respect to various relationships between investments.

• Investments in open-end U.S. mutual funds are valued at NAV each business day.

• Futures contracts are valued based on that day’s last reported settlement price on the exchange where the contract is traded.

If events (e.g., a company announcement, market volatility or a natural disaster) occur that are expected to materially affect the value of such investments, or in the event that the application of these methods of valuation results in a price for an investment that is deemed not to be representative of the market value of such investment, or if a price is not available, the investment will be valued by the Global Valuation Committee, or its delegate, in accordance with a policy approved by the Board as reflecting fair value (“Fair Valued Investments”). The fair valuation approaches that may be used by the Global Valuation Committee will include market approach, income approach and cost approach. Valuation techniques such as discounted cash flow, use of market comparables and matrix pricing are types of valuation approaches and are typically used in determining fair value. When determining the price for Fair Valued Investments, the Global Valuation Committee, or its delegate, seeks to determine the price that the Trust might reasonably expect to receive or pay from the current sale or purchase of that asset or liability in an arm’s-length transaction. Fair value determinations shall be based upon all available factors that the Global Valuation Committee, or its delegate, deems relevant and consistent with the principles of fair value measurement. The pricing of all Fair Valued Investments is subsequently reported to the Board or a committee thereof on a quarterly basis.

Fair Value Hierarchy: Various inputs are used in determining the fair value of investments and derivative financial instruments. These inputs to valuation techniques are categorized into a fair value hierarchy consisting of three broad levels for financial statement purposes as follows:

• Level 1 — Unadjusted price quotations in active markets/exchanges for identical assets or liabilities that the Trust has the ability to access

• Level 2 — Other observable inputs (including, but not limited to, quoted prices for similar assets or liabilities in markets that are active, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the assets or liabilities (such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates) or other market–corroborated inputs)

• Level 3 — Unobservable inputs based on the best information available in the circumstances, to the extent observable inputs are not available (including the Global Valuation Committee’s assumptions used in determining the fair value of investments and derivative financial instruments)

The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). Accordingly, the degree of judgment exercised in determining fair value is greatest for instruments categorized in Level 3. The inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the fair value hierarchy classification is determined based on the lowest level input that is significant to the fair value measurement in its entirety. Investments classified within Level 3 have significant unobservable inputs used by the Global Valuation Committee in determining the price for Fair Valued Investments. Level 3 investments include equity or debt issued by privately held companies or funds. There may not be a secondary market, and/or there are a limited number of investors. The categorization of a value determined for investments and derivative financial instruments is based on the pricing transparency of the investments and derivative financial instruments and is not necessarily an indication of the risks associated with investing in those securities.

4. SECURITIES AND OTHER INVESTMENTS

Forward Commitments, When-Issued and Delayed Delivery Securities: The Trust may purchase securities on a when-issued basis and may purchase or sell securities on a forward commitment basis. Settlement of such transactions normally occurs within a month or more after the purchase or sale commitment is made. The fund may purchase securities under such conditions with the intention of actually acquiring them, but may enter into a separate agreement to sell the securities before the settlement date. Since the value of securities purchased may fluctuate prior to settlement, the fund may be required to pay more at settlement than the security is worth. In addition, the fund is not entitled to any of the interest earned prior to settlement. When purchasing a security on a delayed delivery basis, the fund assumes the rights and risks of ownership of the security, including the risk of price and yield fluctuations. In the event of default by the counterparty, the fund’s maximum amount of loss is the unrealized appreciation of unsettled when-issued transactions.

NOTES TO FINANCIAL STATEMENTS 21

Notes to Financial Statements  (continued)

Reverse Repurchase Agreements: Reverse repurchase agreements are agreements with qualified third party broker dealers in which a fund sells securities to a bank or broker-dealer and agrees to repurchase the same securities at a mutually agreed upon date and price. A fund receives cash from the sale to use for other investment purposes. During the term of the reverse repurchase agreement, a fund continues to receive the principal and interest payments on the securities sold. Certain agreements have no stated maturity and can be terminated by either party at any time. Interest on the value of the reverse repurchase agreements issued and outstanding is based upon competitive market rates determined at the time of issuance. A fund may utilize reverse repurchase agreements when it is anticipated that the interest income to be earned from the investment of the proceeds of the transaction is greater than the interest expense of the transaction. Reverse repurchase agreements involve leverage risk. If a fund suffers a loss on its investment of the transaction proceeds from a reverse repurchase agreement, a fund would still be required to pay the full repurchase price. Further, a fund remains subject to the risk that the market value of the securities repurchased declines below the repurchase price. In such cases, a fund would be required to return a portion of the cash received from the transaction or provide additional securities to the counterparty.

Cash received in exchange for securities delivered plus accrued interest due to the counterparty is recorded as a liability in the Statement of Assets and Liabilities at face value including accrued interest. Due to the short-term nature of the reverse repurchase agreements, face value approximates fair value. Interest payments made by a fund to the counterparties are recorded as a component of interest expense in the Statement of Operations. In periods of increased demand for the security, a fund may receive a fee for the use of the security by the counterparty, which may result in interest income to a fund.

For the year ended July 31, 2020, the average amount of reverse repurchase agreements outstanding and the daily weighted average interest rate for the Trust were $788,011,780 and 1.89%, respectively.

Reverse repurchase transactions are entered into by a fund under Master Repurchase Agreements (each, an “MRA”), which permit a fund, under certain circumstances, including an event of default (such as bankruptcy or insolvency), to offset payables and/or receivables under the MRA with collateral held and/or posted to the counterparty and create one single net payment due to or from a fund. With reverse repurchase transactions, typically a fund and counterparty under an MRA are permitted to sell, re-pledge, or use the collateral associated with the transaction. Bankruptcy or insolvency laws of a particular jurisdiction may impose restrictions on or prohibitions against such a right of offset in the event of the MRA counterparty’s bankruptcy or insolvency. Pursuant to the terms of the MRA, a fund receives or posts securities and cash as collateral with a market value in excess of the repurchase price to be paid or received by a fund upon the maturity of the transaction. Upon a bankruptcy or insolvency of the MRA counterparty, a fund is considered an unsecured creditor with respect to excess collateral and, as such, the return of excess collateral may be delayed.

As of period end, the following table is a summary of the Trust’s open reverse repurchase agreements by counterparty which are subject to offset under an MRA on a net basis:

Counterparty	Reverse Repurchase Agreements			Fair Value of Non-cash Collateral Pledged Including Accrued Interest (a)		Cash Collateral Pledged/Received		Net Amount
Barclays Bank PLC	$	(67,455,160	)	$	67,455,160	$	—	$	—
Mitsubishi UFJ Securities (USA) Inc		(400,516,544	)		400,516,544		—		—
RBC Capital Markets LLC		(244,082,341	)		244,082,341		—		—
	$	(712,054,045	)	$	712,054,045	$	—	$	—

^(a)  Net collateral, including accrued interest, with a value of $776,451,433 has been pledged/received in connection with open reverse repurchase agreements. Excess of net collateral pledged to the individual counterparty is not shown for financial reporting purposes.

In the event the counterparty of securities under an MRA files for bankruptcy or becomes insolvent, a fund’s use of the proceeds from the agreement may be restricted while the counterparty, or its trustee or receiver, determines whether or not to enforce a fund’s obligation to repurchase the securities.

5. DERIVATIVE FINANCIAL INSTRUMENTS

The Trust engages in various portfolio investment strategies using derivative contracts both to increase the returns of the Trust and/or to manage its exposure to certain risks such as credit risk, equity risk, interest rate risk, foreign currency exchange rate risk, commodity price risk or other risks (e.g., inflation risk). Derivative financial instruments categorized by risk exposure are included in the Schedule of Investments. These contracts may be transacted on an exchange or over-the-counter (“OTC”).

Futures Contracts: Futures contracts are purchased or sold to gain exposure to, or manage exposure to, changes in interest rates (interest rate risk) and changes in the value of equity securities (equity risk) or foreign currencies (foreign currency exchange rate risk).

Futures contracts are agreements between the Trust and a counterparty to buy or sell a specific quantity of an underlying instrument at a specified price and on a specified date. Depending on the terms of a contract, it is settled either through physical delivery of the underlying instrument on the settlement date or by payment of a cash amount on the settlement date. Upon entering into a futures contract, the Trust is required to deposit initial margin with the broker in the form of cash or securities in an amount that varies depending on a contract’s size and risk profile. The initial margin deposit must then be maintained at an established level over the life of the contract. Amounts pledged, which are considered restricted, are included in cash pledged for futures contracts in the Statement of Assets and Liabilities.

Securities deposited as initial margin are designated in the Schedule of Investments and cash deposited, if any, are shown as cash pledged for futures contracts in the Statement of Assets and Liabilities. Pursuant to the contract, the Trust agrees to receive from or pay to the broker an amount of cash equal to the daily fluctuation in market value of the contract (“variation margin”). Variation margin is recorded as unrealized appreciation (depreciation) and, if any, shown as variation margin receivable (or payable) on futures contracts in the Statement of Assets and Liabilities. When the contract is closed, a realized gain or loss is recorded in the Statement of Operations equal to the difference between the notional amount of the contract at the time it was opened and the notional amount at the time it was closed. The use of futures contracts involves the risk of an imperfect correlation in the movements in the price of futures contracts and interest, foreign currency exchange rates or underlying assets.

22 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Notes to Financial Statements  (continued)

6. INVESTMENT ADVISORY AGREEMENT AND OTHER TRANSACTIONS WITH AFFILIATES

Investment Advisory: The Trust entered into an Investment Advisory Agreement with the Manager, the Trust’s investment adviser and an indirect, wholly-owned subsidiary of BlackRock, Inc. (“BlackRock”), to provide investment advisory and administrative services. The Manager is responsible for the management of the Trust’s portfolio and provides the personnel, facilities, equipment and certain other services necessary to the operations of the Trust.

For such services, the Trust pays the Manager a monthly fee at an annual rate equal to 0.55% of the average daily value of the Trust’s managed assets.

For purposes of calculating this fee, “managed assets” are determined as total assets of the Trust (including any assets attributable to money borrowed for investment purposes) less the sum of its accrued liabilities (other than money borrowed for investment purposes).

Expense Waivers: The Manager contractually agreed to waive its investment advisory fees by the amount of investment advisory fees the Trust pays to the Manager indirectly through its investment in affiliated money market funds (the “affiliated money market fund waiver”) through June 30, 2022. The contractual agreement may be terminated upon 90 days’ notice by a majority of the Independent Trustees, or by a vote of a majority of the outstanding voting securities of the Trust. Prior to December 1, 2019, this waiver was voluntary. This amount is included in fees waived and/or reimbursed by the Manager in the Statement of Operations. For the year ended July 31, 2020, the amounts waived were $16,121.

The Manager contractually agreed to waive its investment advisory fee with respect to any portion of the Trust’s assets invested in affiliated equity and fixed-income mutual funds and affiliated exchange-traded funds that have a contractual management fee through June 30, 2022. The agreement can be renewed for annual periods thereafter, and may be terminated on 90 days’ notice, each subject to approval by a majority of the Trust’s Independent Trustees. For the year ended July 31, 2020, there were no fees waived and/or reimbursed by the Manager pursuant to this arrangement.

Trustees and Officers: Certain trustees and/or officers of the Trust are directors and/or officers of BlackRock or its affiliates. The Trust reimburses the Manager for a portion of the compensation paid to the Trust’s Chief Compliance Officer, which is included in Trustees and Officer in the Statement of Operations.

7. PURCHASES AND SALES

For the year ended July 31, 2020, purchases and sales of investments excluding short-term securities, were $323,637,088 and $443,507,809, respectively.

8. INCOME TAX INFORMATION

It is the Trust’s policy to comply with the requirements of the Internal Revenue Code of 1986, as amended, applicable to regulated investment companies, and to distribute substantially all of its taxable income to its shareholders. Therefore, no U.S. federal income tax provision is required.

The Trust files U.S. federal and various state and local tax returns. No income tax returns are currently under examination. The statute of limitations on the Trust’s U.S. federal tax returns generally remains open for each of the four years ended July 31, 2020. The statutes of limitations on the Trust’s state and local tax returns may remain open for an additional year depending upon the jurisdiction.

Management has analyzed tax laws and regulations and their application to the Trust as of July 31, 2020, inclusive of the open tax return years, and does not believe that there are any uncertain tax positions that require recognition of a tax liability in the Trust’s financial statements.

The tax character of distributions paid was as follows:

	07/31/20		07/31/19
Ordinary income	$	76,644,636	$	80,316,892
Return of capital		—		716,926
	$	76,644,636	$	81,033,818

As of period end, the tax components of accumulated earnings (loss) were as follows:

Undistributed ordinary income	$	3,878,532
Non-expiring capital loss carryforwards(a)		(106,034,695	)
Net unrealized gains (losses)(b)		469,405,313
	$	367,249,150

^(a)  Amounts available to offset future realized capital gains.

^(b)  The difference between book-basis and tax-basis net unrealized gains was attributable primarily to the realization for tax purposes of unrealized gains/losses on certain futures contracts, amortization methods for premiums on fixed income securities and the deferral of compensation to Trustees.

As of July 31, 2020, gross unrealized appreciation and depreciation for investments and derivatives based on cost for U.S. federal income tax purposes were as follows:

Tax cost	$	1,692,217,286
Gross unrealized appreciation	$	471,574,098
Gross unrealized depreciation		(1,674,131	)
Net unrealized appreciation (depreciation)	$	469,899,967

NOTES TO FINANCIAL STATEMENTS 23

Notes to Financial Statements  (continued)

9. PRINCIPAL RISKS

Many municipalities insure repayment of their bonds, which may reduce the potential for loss due to credit risk. The market value of these bonds may fluctuate for other reasons, including market perception of the value of such insurance, and there is no guarantee that the insurer will meet its obligation.

Inventories of municipal bonds held by brokers and dealers may decrease, which would lessen their ability to make a market in these securities. Such a reduction in market making capacity could potentially decrease the Trust’s ability to buy or sell bonds. As a result, the Trust may sell a security at a lower price, sell other securities to raise cash, or give up an investment opportunity, any of which could have a negative impact on performance. If the Trust needed to sell large blocks of bonds, those sales could further reduce the bonds’ prices and impact performance.

In the normal course of business, the Trust invests in securities or other instruments and may enter into certain transactions, and such activities subject the Trust to various risks, including among others, fluctuations in the market (market risk) or failure of an issuer to meet all of its obligations. The value of securities or other instruments may also be affected by various factors, including, without limitation: (i) the general economy; (ii) the overall market as well as local, regional or global political and/or social instability; (iii) regulation, taxation or international tax treaties between various countries; or (iv) currency, interest rate and price fluctuations. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Trust and its investments.

The Trust may be exposed to prepayment risk, which is the risk that borrowers may exercise their option to prepay principal earlier than scheduled during periods of declining interest rates, which would force the Trust to reinvest in lower yielding securities. The Trust may also be exposed to reinvestment risk, which is the risk that income from the Trust’s portfolio will decline if the Trust invests the proceeds from matured, traded or called fixed-income securities at market interest rates that are below the Trust portfolio’s current earnings rate.

The Trust may hold a significant amount of bonds subject to calls by the issuers at defined dates and prices. When bonds are called by issuers and the Trust reinvest the proceeds received, such investments may be in securities with lower yields than the bonds originally held, and correspondingly, could adversely impact the yield and total return performance of the Trust.

The BABs market is smaller, less diverse and less liquid than other types of municipal securities. Since the BABs program expired on December 31, 2010 and was not extended, BABs may be less actively traded, which may negatively affect the value of BABs held by the Trust.

The Trust may invest in BABs. Issuers of direct pay BABs held in the Trust’s portfolio receive a subsidy from the U.S. Treasury with respect to interest payment on bonds. There is no assurance that an issuer will comply with the requirements to receive such subsidy or that such subsidy will not be reduced or terminated altogether in the future. As of period end, the subsidy that issuers of direct payment BABs receive from the U.S. Treasury has been reduced as the result of budgetary sequestration, which has resulted, and which may continue to result, in early redemptions of BABs at par value. The early redemption of BABs at par value may result in a potential loss in value for investors of such BABs, including the Trust, who may have purchased the securities at prices above par, and may require the Trust to reinvest redemption proceeds in lower-yielding securities which could reduce the Trust’s income and distributions. Moreover, the elimination or reduction in subsidy from the federal government may adversely affect an issuer’s ability to repay or refinance BABs and the BABs’ credit ratings, which, in turn, may adversely affect the value of the BABs held by the Trust and the Trust’s NAV.

The Trust may invest without limitation in illiquid or less liquid investments or investments in which no secondary market is readily available or which are otherwise illiquid, including private placement securities. The Trust may not be able to readily dispose of such investments at prices that approximate those at which the Trust could sell such investments if they were more widely traded and, as a result of such illiquidity, the Trust may have to sell other investments or engage in borrowing transactions if necessary to raise funds to meet its obligations. Limited liquidity can also affect the market price of investments, thereby adversely affecting the Trust’s net asset value and ability to make dividend distributions. Privately issued debt securities are often of below investment grade quality, frequently are unrated and present many of the same risks as investing in below investment grade public debt securities.

An outbreak of respiratory disease caused by a novel coronavirus has developed into a global pandemic and has resulted in closing borders, quarantines, disruptions to supply chains and customer activity, as well as general concern and uncertainty. The impact of this pandemic, and other global health crises that may arise in the future, could affect the economies of many nations, individual companies and the market in general in ways that cannot necessarily be foreseen at the present time. This pandemic may result in substantial market volatility and may adversely impact the prices and liquidity of a fund’s investments. The duration of this pandemic and its effects cannot be determined with certainty.

Counterparty Credit Risk: The Trust may be exposed to counterparty credit risk, or the risk that an entity may fail to or be unable to perform on its commitments related to unsettled or open transactions. The Trust manages counterparty credit risk by entering into transactions only with counterparties that the Manager believes have the financial resources to honor their obligations and by monitoring the financial stability of those counterparties. Financial assets, which potentially expose the Trust to market, issuer and counterparty credit risks, consist principally of financial instruments and receivables due from counterparties. The extent of the Trust’s exposure to market, issuer and counterparty credit risks with respect to these financial assets is approximately their value recorded in the Statement of Assets and Liabilities, less any collateral held by the Trust.

A derivative contract may suffer a mark-to-market loss if the value of the contract decreases due to an unfavorable change in the market rates or values of the underlying instrument. Losses can also occur if the counterparty does not perform under the contract.

With exchange-traded futures, there is less counterparty credit risk to the Trust since the exchange or clearinghouse, as counterparty to such instruments, guarantees against a possible default. The clearinghouse stands between the buyer and the seller of the contract; therefore, credit risk is limited to failure of the clearinghouse. While offset rights may exist under applicable law, the Trust does not have a contractual right of offset against a clearing broker or clearinghouse in the event of a default (including the bankruptcy or insolvency). Additionally, credit risk exists in exchange-traded futures with respect to initial and variation margin that is held in a clearing

24 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Notes to Financial Statements  (continued)

broker’s customer accounts. While clearing brokers are required to segregate customer margin from their own assets, in the event that a clearing broker becomes insolvent or goes into bankruptcy and at that time there is a shortfall in the aggregate amount of margin held by the clearing broker for all its clients, typically the shortfall would be allocated on a pro rata basis across all the clearing broker’s customers, potentially resulting in losses to the Trust.

Concentration Risk: The Trust invests a substantial amount of its assets in issuers located in a single state or limited number of states. This may subject the Trust to the risk that economic, political or social issues impacting a particular state or group of states could have an adverse and disproportionate impact on the income from, or the value or liquidity of, the Trust’s portfolio. Investment percentages in specific states or U.S. territories are presented in the Schedule of Investments.

The Trust invests a significant portion of its assets in fixed-income securities and/or uses derivatives tied to the fixed-income markets. Changes in market interest rates or economic conditions may affect the value and/or liquidity of such investments. Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall and decrease as interest rates rise. The Trust may be subject to a greater risk of rising interest rates due to the current period of historically low rates.

LIBOR Transition Risk: The United Kingdom’s Financial Conduct Authority announced a phase out of the London Interbank Offered Rate (“LIBOR”) by the end of 2021, and it is expected that LIBOR will cease to be published after that time. The Trust may be exposed to financial instruments tied to LIBOR to determine payment obligations, financing terms, hedging strategies or investment value. The transition process away from LIBOR might lead to increased volatility and illiquidity in markets for, and reduce the effectiveness of new hedges placed against, instruments whose terms currently include LIBOR. The ultimate effect of the LIBOR transition process on the Trust is uncertain.

10. CAPITAL SHARE TRANSACTIONS

The Trust is authorized to issue an unlimited number of shares, all of which were initially classified as Common Shares. The par value for the Trust’s Common Shares is $0.001. The Board is authorized, however, to reclassify any unissued Common Shares to Preferred Shares without the approval of Common Shareholders.

For the years shown, shares issued and outstanding increased by the following amounts as a result of dividend reinvestment:

Year Ended July 31,
2020	42,857
2019	—

The Trust participates in an open market share repurchase program (the “Repurchase Program”). From December 1, 2018 through November 30, 2019, the Trust may repurchase up to 5% of its outstanding common shares under the Repurchase Program, based on common shares outstanding as of the close of business on November 30, 2018, subject to certain conditions. From December 1, 2019 through November 30, 2020, the Trust may repurchase up to 5% of its outstanding common shares under the Repurchase Program, based on common shares outstanding as of the close of business on November 30, 2019, subject to certain conditions. There is no assurance that the Trust will purchase shares in any particular amounts. For the year ended July 31, 2020, the Trust did not repurchase any shares.

11. SUBSEQUENT EVENTS

Management’s evaluation of the impact of all subsequent events on the Trust’s financial statements was completed through the date the financial statements were issued and the following items were noted:

The Trust declared and paid distributions to Common Shareholders as follows:

	Dividend Per Common Share
	Paid (a)		Declared (b)
BBN	$	0.111800		$0.111800

^(a)  Net investment income dividend paid on August 31, 2020 to shareholders of record on August 14, 2020.

^(b)  Net investment income dividend declared on September 1, 2020, payable to shareholders of record on September 15, 2020.

NOTES TO FINANCIAL STATEMENTS 25

Report of Independent Registered Public Accounting Firm

To the Shareholders and Board of Trustees of BlackRock Taxable Municipal Bond Trust:

Opinion on the Financial Statements and Financial Highlights

We have audited the accompanying statement of assets and liabilities of BlackRock Taxable Municipal Bond Trust (the “Fund”), including the schedule of investments, as of July 31, 2020, the related statements of operations and cash flows for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, the financial highlights for each of the five years in the period then ended, and the related notes. In our opinion, the financial statements and financial highlights present fairly, in all material respects, the financial position of the Fund as of July 31, 2020, and the results of its operations and its cash flows for the year then ended, the changes in its net assets for each of the two years in the period then ended, and the financial highlights for each of the five years in the period then ended, in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements and financial highlights are the responsibility of the Fund’s management. Our responsibility is to express an opinion on the Fund’s financial statements and financial highlights based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Fund in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement, whether due to error or fraud. The Fund is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Fund’s internal control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements and financial highlights, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements and financial highlights. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements and financial highlights. Our procedures included confirmation of securities owned as of July 31, 2020, by correspondence with the custodian and brokers; when replies were not received from brokers, we performed other auditing procedures. We believe that our audits provide a reasonable basis for our opinion.

Deloitte & Touche LLP

Boston, Massachusetts

September 22, 2020

We have served as the auditor of one or more BlackRock investment companies since 1992.

26 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Important Tax Information  (unaudited)

For the fiscal year ended July 31, 2020, the Trust hereby designates the following maximum amounts allowable as interest-related dividends eligible for exemption from U.S. withholding tax for nonresident aliens and foreign corporations:

Trust	Interest-Related Dividends
BlackRock Taxable Municipal Bond Trust	$	80,493,119

IMPORTANT TAX INFORMATION 27

Disclosure of Investment Advisory Agreement

The Board of Trustees (the “Board,” the members of which are referred to as “Board Members”) of BlackRock Taxable Municipal Bond Trust (the “Fund”) met on April 16, 2020 (the “April Meeting”) and May 20-21, 2020 (the “May Meeting”) to consider the approval of the investment advisory agreement (the “Advisory Agreement” or the “Agreement”) between the Fund and BlackRock Advisors, LLC (the “Manager” or “BlackRock”), the Fund’s investment advisor.

Activities and Composition of the Board

On the date of the May Meeting, the Board consisted of ten individuals, eight of whom were not “interested persons” of the Fund as defined in the Investment Company Act of 1940, as amended (the “1940 Act”) (the “Independent Board Members”). The Board Members are responsible for the oversight of the operations of the Fund and perform the various duties imposed on the directors of investment companies by the 1940 Act. The Independent Board Members have retained independent legal counsel to assist them in connection with their duties. The Co-Chairs of the Board are Independent Board Members. The Board has established five standing committees: an Audit Committee, a Governance and Nominating Committee, a Compliance Committee, a Performance Oversight Committee and an Executive Committee, each of which is chaired by an Independent Board Member and composed of Independent Board Members (except for the Executive Committee, which also has one interested Board Member).

The Agreement

Consistent with the requirements of the 1940 Act, the Board considers the continuation of the Agreement on an annual basis. The Board has four quarterly meetings per year, each typically extending for two days, and additional in-person and telephonic meetings throughout the year, as needed. While the Board also has a fifth one-day meeting to consider specific information surrounding the renewal of the Agreement, the Board’s consideration entails a year-long deliberative process whereby the Board and its committees assess BlackRock’s services to the Fund. In particular, the Board assessed, among other things, the nature, extent and quality of the services provided to the Fund by BlackRock, BlackRock’s personnel and affiliates, including (as applicable): investment management services; accounting oversight; administrative and shareholder services; oversight of the Fund’s service providers; risk management and oversight; and legal, regulatory and compliance services. Throughout the year, including during the contract renewal process, the Independent Board Members were advised by independent legal counsel, and met with independent legal counsel in various executive sessions outside of the presence of BlackRock’s management.

During the year, the Board, acting directly and through its committees, considers information that is relevant to its annual consideration of the renewal of the Agreement, including the services and support provided by BlackRock to the Fund and its shareholders. BlackRock also furnished additional information to the Board in response to specific questions from the Board. This additional information is discussed further in the section titled “Board Considerations in Approving the Agreement.” Among the matters the Board considered were: (a) investment performance for one-year, three-year, five-year, and/or since inception periods, as applicable, against peer funds, applicable benchmarks, and other performance metrics, as applicable, as well as BlackRock senior management’s and portfolio managers’ analyses of the reasons for any outperformance or underperformance relative to its peers, benchmarks, and other performance metrics, as applicable; (b) leverage management, as applicable; (c) fees, including advisory, administration, if applicable, and other amounts paid to BlackRock and its affiliates by the Fund for services; (d) Fund operating expenses and how BlackRock allocates expenses to the Fund; (e) the resources devoted to risk oversight of, and compliance reports relating to, implementation of the Fund’s investment objective, policies and restrictions, and meeting regulatory requirements; (f) BlackRock’s and the Fund’s adherence to applicable compliance policies and procedures; (g) the nature, character and scope of non-investment management services provided by BlackRock and its affiliates and the estimated cost of such services; (h) BlackRock’s and other service providers’ internal controls and risk and compliance oversight mechanisms; (i) BlackRock’s implementation of the proxy voting policies approved by the Board; (j) execution quality of portfolio transactions; (k) BlackRock’s implementation of the Fund’s valuation and liquidity procedures; (l) an analysis of management fees for products with similar investment mandates across the open-end fund, closed-end fund, sub-advised mutual fund, collective investment trust and institutional separate account product channels, as applicable, and the similarities and differences between these products and the services provided as compared to the Fund; (m) BlackRock’s compensation methodology for its investment professionals and the incentives and accountability it creates, along with investment professionals’ investments in the fund(s) they manage; (n) periodic updates on BlackRock’s business; and (o) the Fund’s market discount/premium compared to peer funds.

Board Considerations in Approving the Agreement

The Approval Process: Prior to the April Meeting, the Board requested and received materials specifically relating to the Agreement. The Independent Board Members are continuously engaged in a process with their independent legal counsel and BlackRock to review the nature and scope of the information provided to the Board to better assist its deliberations. The materials provided in connection with the April Meeting included, among other things: (a) information independently compiled and prepared by Broadridge Financial Solutions, Inc. (“Broadridge”), based on Lipper classifications, regarding the Fund’s fees and expenses as compared with a peer group of funds as determined by Broadridge (“Expense Peers”) and the investment performance of the Fund as compared with a peer group of funds (“Performance Peers”); (b) information on the composition of the Expense Peers and Performance Peers and a description of Broadridge’s methodology; (c) information on the estimated profits realized by BlackRock and its affiliates pursuant to the Agreement and a discussion of fall-out benefits to BlackRock and its affiliates; (d) a general analysis provided by BlackRock concerning investment management fees received in connection with other types of investment products, such as institutional accounts, sub-advised mutual funds, closed-end funds, and open-end funds, under similar investment mandates, as applicable; (e) a review of non-management fees; (f) the existence, impact and sharing of potential economies of scale, if any, with the Fund; (g) a summary of aggregate amounts paid by the Fund to BlackRock; and (h) various additional information requested by the Board as appropriate regarding BlackRock’s and the Fund’s operations.

At the April Meeting, the Board reviewed materials relating to its consideration of the Agreement. As a result of the discussions that occurred during the April Meeting, and as a culmination of the Board’s year-long deliberative process, the Board presented BlackRock with questions and requests for additional information. BlackRock responded to these questions and requests with additional written information in advance of the May Meeting. Topics covered included: (a) the methodology for measuring estimated fund profitability; (b) fund expenses and potential fee waivers; (c) differences in services provided and management fees between closed-end funds and other product channels; and (d) BlackRock’s option overwrite strategy.

28 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Disclosure of Investment Advisory Agreement  (continued)

At the May Meeting, the Board concluded its assessment of, among other things: (a) the nature, extent and quality of the services provided by BlackRock; (b) the investment performance of the Fund as compared to its Performance Peers and to other metrics, as applicable; (c) the advisory fee and the estimated cost of the services and estimated profits realized by BlackRock and its affiliates from their relationship with the Fund; (d) the Fund’s fees and expenses compared to its Expense Peers; (e) the existence and sharing of potential economies of scale; (f) any fall-out benefits to BlackRock and its affiliates as a result of BlackRock’s relationship with the Fund; and (g) other factors deemed relevant by the Board Members.

The Board also considered other matters it deemed important to the approval process, such as other payments made to BlackRock or its affiliates relating to securities lending and cash management, and BlackRock’s services related to the valuation and pricing of Fund portfolio holdings. The Board noted the willingness of BlackRock’s personnel to engage in open, candid discussions with the Board. The Board did not identify any particular information as determinative, and each Board Member may have attributed different weights to the various items considered.

A. Nature, Extent and Quality of the Services Provided by BlackRock: The Board, including the Independent Board Members, reviewed the nature, extent and quality of services provided by BlackRock, including the investment advisory services, and the resulting performance of the Fund. Throughout the year, the Board compared Fund performance to the performance of a comparable group of closed-end funds, relevant benchmarks, and performance metrics, as applicable. The Board met with BlackRock’s senior management personnel responsible for investment activities, including the senior investment officers. The Board also reviewed the materials provided by the Fund’s portfolio management team discussing the Fund’s performance, investment strategies and outlook.

The Board considered, among other factors, with respect to BlackRock: the number, education and experience of investment personnel generally and the Fund’s portfolio management team; research capabilities; investments by portfolio managers in the funds they manage; portfolio trading capabilities; use of technology; commitment to compliance; credit analysis capabilities; risk analysis and oversight capabilities; and the approach to training and retaining portfolio managers and other research, advisory and management personnel. The Board also considered BlackRock’s overall risk management program, including the continued efforts of BlackRock and its affiliates to address cybersecurity risks and the role of BlackRock’s Risk & Quantitative Analysis Group. The Board engaged in a review of BlackRock’s compensation structure with respect to the Fund’s portfolio management team and BlackRock’s ability to attract and retain high-quality talent and create performance incentives.

In addition to investment advisory services, the Board considered the nature and quality of the administrative and other non-investment advisory services provided to the Fund. BlackRock and its affiliates provide the Fund with certain administrative, shareholder and other services (in addition to any such services provided to the Fund by third-parties) and officers and other personnel as are necessary for the operations of the Fund. In particular, BlackRock and its affiliates provide the Fund with administrative services including, among others: (i) responsibility for disclosure documents, such as the prospectus and the statement of additional information in connection with the initial public offering and periodic shareholder reports; (ii) preparing communications with analysts to support secondary market trading of the Fund; (iii) oversight of daily accounting and pricing; (iv) responsibility for periodic filings with regulators and stock exchanges; (v) overseeing and coordinating the activities of third-party service providers including, among others, the Fund’s custodian, fund accountant, transfer agent, and auditor; (vi) organizing Board meetings and preparing the materials for such Board meetings; (vii) providing legal and compliance support; (viii) furnishing analytical and other support to assist the Board in its consideration of strategic issues such as the merger, consolidation or repurposing of certain closed-end funds; and (ix) performing or managing administrative functions necessary for the operation of the Fund, such as tax reporting, expense management, fulfilling regulatory filing requirements, and shareholder call center and other services. The Board reviewed the structure and duties of BlackRock’s fund administration, shareholder services, and legal & compliance departments and considered BlackRock’s policies and procedures for assuring compliance with applicable laws and regulations.

B. The Investment Performance of the Fund and BlackRock: The Board, including the Independent Board Members, also reviewed and considered the performance history of the Fund. In preparation for the April Meeting, the Board was provided with reports independently prepared by Broadridge, which included an analysis of the Fund’s performance as of December 31, 2019, as compared to its Performance Peers. The performance information is based on net asset value (NAV), and utilizes Lipper data. Lipper’s methodology calculates a fund’s total return assuming distributions are reinvested on the ex-date at a fund’s ex-date NAV. Broadridge ranks funds in quartiles, ranging from first to fourth, where first is the most desirable quartile position and fourth is the least desirable. In connection with its review, the Board received and reviewed information regarding the investment performance of the Fund as compared to its Performance Peers and a custom peer group of funds as defined by BlackRock (“Customized Peer Group”) and a composite measuring a blend of total return and yield (“Composite”). The Board and its Performance Oversight Committee regularly review and meet with Fund management to discuss the performance of the Fund throughout the year.

In evaluating performance, the Board focused particular attention on funds with less favorable performance records. The Board also noted that while it found the data provided by Broadridge generally useful, it recognized the limitations of such data, including in particular, that notable differences may exist between a fund and its Performance Peers (for example, the investment objectives and strategies). Further, the Board recognized that the performance data reflects a snapshot of a period as of a particular date and that selecting a different performance period could produce significantly different results. The Board also acknowledged that long-term performance could be impacted by even one period of significant outperformance or underperformance, and that a single investment theme could have the ability to disproportionately affect long-term performance.

The Board noted that for each of the one-, three- and five-year periods reported, the Fund ranked in the first quartile against its Customized Peer Group Composite. The Board noted that BlackRock believes that the Customized Peer Group Composite is an appropriate performance metric for the Fund, and that BlackRock has explained its rationale for this belief to the Board.

C. Consideration of the Advisory/Management Fees and the Estimated Cost of the Services and Estimated Profits Realized by BlackRock and its Affiliates from their Relationship with the Fund: The Board, including the Independent Board Members, reviewed the Fund’s contractual management fee rate compared with those of its Expense Peers. The contractual management fee rate represents a combination of the advisory fee and any administrative fees, before taking into account any reimbursements or fee waivers. The Board also compared the Fund’s total expense ratio, as well as its actual management fee rate as a percentage of managed assets, which is the total assets of the Fund (including any assets attributable to money borrowed for investment purposes) minus the sum of the Fund’s accrued liabilities (other than money borrowed for investment purposes) to those of its Expense Peers. The total expense ratio represents a fund’s total net operating expenses, excluding any investment related expenses. The total expense ratio gives effect to any expense reimbursements or fee waivers, and the actual management fee rate gives effect to any

DISCLOSURE OF INVESTMENT ADVISORY AGREEMENT 29

Disclosure of Investment Advisory Agreement  (continued)

management fee reimbursements or waivers. The Board considered the services provided and the fees charged by BlackRock and its affiliates to other types of clients with similar investment mandates, as applicable, including institutional accounts and sub-advised mutual funds (including mutual funds sponsored by third parties).

The Board received and reviewed statements relating to BlackRock’s financial condition. The Board reviewed BlackRock’s profitability methodology and was also provided with an estimated profitability analysis that detailed the revenues earned and the expenses incurred by BlackRock for services provided to the Fund. The Board reviewed BlackRock’s estimated profitability with respect to the Fund and other funds the Board currently oversees for the year ended December 31, 2019 compared to available aggregate estimated profitability data provided for the prior two years. The Board reviewed BlackRock’s estimated profitability with respect to certain other U.S. fund complexes managed by the Manager and/or its affiliates. The Board reviewed BlackRock’s assumptions and methodology of allocating expenses in the estimated profitability analysis, noting the inherent limitations in allocating costs among various advisory products. The Board recognized that profitability may be affected by numerous factors including, among other things, fee waivers and expense reimbursements by the Manager, the types of funds managed, precision of expense allocations and business mix. The Board thus recognized that calculating and comparing profitability at the individual fund level is difficult.

The Board noted that, in general, individual fund or product line profitability of other advisors is not publicly available. The Board reviewed BlackRock’s overall operating margin, in general, compared to that of certain other publicly traded asset management firms. The Board considered the differences between BlackRock and these other firms, including the contribution of technology at BlackRock, BlackRock’s expense management, and the relative product mix.

The Board considered whether BlackRock has the financial resources necessary to attract and retain high quality investment management personnel to perform its obligations under the Agreement and to continue to provide the high quality of services that is expected by the Board. The Board further considered factors including but not limited to BlackRock’s commitment of time, assumption of risk, and liability profile in servicing the Fund, including in contrast to what is required of BlackRock with respect to other products with similar investment mandates across the open-end fund, closed-end fund, sub-advised mutual fund, collective investment trust, and institutional separate account product channels, as applicable.

The Board noted that the Fund’s contractual management fee rate ranked in the first quartile, and that the actual management fee rate and total expense ratio ranked in the first and second quartiles, respectively, relative to the Expense Peers.

D. Economies of Scale: The Board, including the Independent Board Members, considered the extent to which economies of scale might be realized as the assets of the Fund increase. The Board also considered the extent to which the Fund benefits from such economies of scale in a variety of ways, and whether there should be changes in the advisory fee rate or breakpoint structure in order to enable the Fund to more fully participate in these economies of scale. The Board considered the Fund’s asset levels and whether the current fee was appropriate.

Based on the Board’s review and consideration of the issue, the Board concluded that most closed-end funds do not have fund level breakpoints because closed-end funds generally do not experience substantial growth after the initial public offering. Closed-end funds are typically priced at scale at a fund’s inception.

E. Other Factors Deemed Relevant by the Board Members: The Board, including the Independent Board Members, also took into account other ancillary or “fall-out” benefits that BlackRock or its affiliates may derive from BlackRock’s respective relationships with the Fund, both tangible and intangible, such as BlackRock’s ability to leverage its investment professionals who manage other portfolios and its risk management personnel, an increase in BlackRock’s profile in the investment advisory community, and the engagement of BlackRock’s affiliates as service providers to the Fund, including for administrative, securities lending and cash management services. The Board also considered BlackRock’s overall operations and its efforts to expand the scale of, and improve the quality of, its operations. The Board also noted that, subject to applicable law, BlackRock may use and benefit from third-party research obtained by soft dollars generated by certain registered fund transactions to assist in managing all or a number of its other client accounts.

In connection with its consideration of the Agreement, the Board also received information regarding BlackRock’s brokerage and soft dollar practices. The Board received reports from BlackRock which included information on brokerage commissions and trade execution practices throughout the year.

The Board noted the competitive nature of the closed-end fund marketplace, and that shareholders are able to sell their Fund shares in the secondary market if they believe that the Fund’s fees and expenses are too high or if they are dissatisfied with the performance of the Fund.

The Board also considered the various notable initiatives and projects BlackRock performed in connection with its closed-end fund product line. These initiatives included developing equity shelf programs; efforts to eliminate product overlap with fund mergers; ongoing services to manage leverage that has become increasingly complex; periodic evaluation of share repurchases and other support initiatives for certain BlackRock funds; and continued communication efforts with shareholders, fund analysts and financial advisers. With respect to the latter, the Independent Board Members noted BlackRock’s continued commitment to supporting the secondary market for the common shares of its closed-end funds through a comprehensive secondary market communication program designed to raise investor and analyst awareness and understanding of closed-end funds. BlackRock’s support services included, among other things: sponsoring and participating in conferences; communicating with closed-end fund analysts covering the BlackRock funds throughout the year; providing marketing and product updates for the closed-end funds; and maintaining and enhancing its closed-end fund website.

Conclusion

The Board, including the Independent Board Members, unanimously approved the continuation of the Advisory Agreement between the Manager and the Fund for a one-year term ending June 30, 2021. Based upon its evaluation of all of the aforementioned factors in their totality, as well as other information, the Board, including the Independent Board Members, was satisfied that the terms of the Agreement were fair and reasonable and in the best interest of the Fund and its shareholders. In arriving at its decision to approve the Agreement, the Board did not identify any single factor or group of factors as all-important or controlling, but considered all factors together, and different Board Members may have attributed different weights to the various factors considered. The Independent Board Members were also assisted by the advice of independent legal counsel in making this determination.

30 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Trust Investment Objectives, Policies and Risks

Recent Changes

The following information is a summary of certain changes since July 31, 2019. This information may not reflect all of the changes that have occurred since you purchased the Trust.

During the Trust’s most recent fiscal year, there were no material changes in the Trust’s investment objectives or policies that have not been approved by shareholders or in the principal risk factors associated with investment in the Trust.

Investment Objectives and Policies

BlackRock Taxable Municipal Bond Trust (BBN)

The Trust’s primary investment objective is to seek high current income, with a secondary objective of capital appreciation. There can be no assurance that the Trust will achieve its investment objectives. The Trust’s investment objectives are not fundamental and may be changed by its Board of Trustees (the “Board”).

The Trust seeks to achieve its investment objectives by investing primarily in a portfolio of taxable municipal securities, including Build America Bonds (“BABs”), issued by state and local governments to finance capital projects such as public schools, roads, transportation infrastructure, bridges, ports and public buildings. The Trust believes there could be an opportunity to capitalize on the market for BABs by investing in taxable municipal issues at attractive market yields relative to the yields on equivalently rated corporate bonds. BlackRock Advisors, LLC (the “Manager”) will use its in-depth expertise in the municipal securities market to assemble the Trust’s portfolio. As market conditions permit and based upon the Manager’s assessment of the interest rate environment, the Trust may opportunistically hedge its duration in an attempt to protect against the risk of rising interest rates, although no assurance can be given that this strategy will be successful. The Manager will not manage duration to a benchmark. Duration, in comparison to maturity (which is the date on which the issuer of a debt instrument is obligated to repay the principal amount), is a measure of the price volatility of a debt instrument as a result in changes in market rates of interest, based on the weighted average timing of the instrument’s expected principal and interest payments. Duration differs from maturity in that it takes into account a security’s yield, coupon payments and its principal payments in addition to the amount of time until the security finally matures. As the value of a security changes over time, so will its duration.

The Trust may invest in taxable municipal securities and tax-exempt municipal securities, including municipal bonds and notes, certificates of participation, other securities issued to finance and refinance public projects, and other related securities and derivative instruments creating exposure to municipal bonds, notes and securities. Under normal market conditions, the Trust will invest at least 80% of its Managed Assets in taxable municipal securities, which include BABs. This investment policy may be changed by the Board upon 60 days’ prior notice to shareholders. The Trust may invest up to 20% of its Managed Assets in securities other than taxable municipal securities. Such other securities include tax-exempt securities, U.S. Treasury securities, obligations of the U.S. Government, its agencies and instrumentalities and corporate bonds issued by issuers that have, in the Manager’s view, typically been associated with or sold in the municipal market. “Managed Assets” means the total assets of the Trust (including any assets attributable to money borrowed for investment purposes) minus the sum of the Trust’s accrued liabilities (other than money borrowed for investment purposes). For the avoidance of doubt, assets attributable to money borrowed for investment purposes includes the portion of the Trust’s assets in an issuer of tender option bonds of which the Trust owns the TOBs Residual (as defined below).

Under normal market conditions, the Trust will invest at least 80% of its Managed Assets in securities that at the time of investment are investment grade quality. Investment grade quality securities are securities rated within the four highest grades (“Baa” or “BBB” or better) by Moody’s, S&P or Fitch or securities that are unrated but judged to be of comparable quality by the Manager. The Trust may invest up to 20% of its Managed Assets in securities that at the time of investment are rated below investment grade quality by Moody’s, S&P or Fitch or that are unrated but judged to be of comparable quality by the Manager. Certain of the Trust’s investments may be illiquid. “Managed Assets” means the total assets of the Trust (including any assets attributable to money borrowed for investment purposes) minus the sum of the Trust’s accrued liabilities (other than money borrowed for investment purposes).

BABs are taxable municipal securities issued by state and local governments. Municipal securities include, among other things, bonds, notes, leases and certificates of participation. Municipal securities may be structured as callable or non-callable, may have payment forms that include fixed-coupon, variable rate and zero coupon, and may include capital appreciation bonds, floating rate securities, inverse floating rate securities (including TOBs Residuals), inflation-linked securities and other derivative instruments that replicate investment exposure to such securities. BABs, as municipal securities, may be structured in any of the foregoing ways and new versions of BABs may be offered in the future. The Trust may invest in any of these BABs or municipal securities, and may acquire them through investments in pooled vehicles, partnerships or other investment companies. The Trust may also purchase BABs and other municipal securities representing a wide range of sectors and purposes.

The Trust may purchase municipal securities that are additionally secured by insurance, bank credit agreements or escrow accounts. The credit quality of companies which provide these credit enhancements will affect the value of those securities. Although the insurance feature reduces certain financial risks, the premiums for insurance and the higher market price paid for insured obligations may reduce the Trust’s income. Insurance generally will be obtained from insurers with a claims-paying ability rated Baa or BBB or better by Moody’s, S&P or Fitch. The insurance feature does not guarantee the market value of the insured obligations or the net asset value of the common shares. The Trust may purchase insured securities and may purchase insurance for bonds in its portfolio.

The credit quality policies noted above apply only at the time a security is purchased, and the Trust is not required to dispose of a security in the event that a rating agency downgrades its assessment of the credit characteristics of a particular issue. In determining whether to retain or sell such a security, the Manager may consider such factors as its assessment of the credit quality of the issuer of such security, the price at which such security could be sold and the rating, if any, assigned to such security by other rating agencies.

The Trust may implement various temporary “defensive” strategies at times when the Manager determines that conditions in the markets or the termination of the Trust makes pursuing the Trust’s basic investment strategy inconsistent with the best interests of its shareholders. These strategies may include investing all or a portion of the Trust’s assets in U.S. Government obligations and high-quality, short-term debt securities that may be either tax-exempt or taxable.

TRUST INVESTMENT OBJECTIVES, POLICIES AND RISKS 31

Trust Investment Objectives, Policies and Risks  (continued)

The Trust may engage in various strategic transactions involving derivative instruments for hedging and risk management purposes or to enhance total return. Such derivative instruments may include, but are not limited to, financial futures contracts, swap contracts (including, but not limited to, credit default swaps), options on financial futures, options on swap contracts and other derivative instruments.

The Trust originally sought to achieve its investment objectives by investing primarily in a portfolio of BABs, which are taxable municipal securities issued pursuant to the American Recovery and Reinvestment Act of 2009. Given the uncertainty around the BABs program at the time of the Trust’s launch in 2010, the Trust’s initial public offering prospectus included a Contingent Review Provision. For any 24-month period, if there were no new issuances of BABs or other analogous taxable municipal securities, the Board would undertake an evaluation of potential actions with respect to the Trust (the “Contingent Review Provision”). Under the Contingent Review Provision, such potential action included changes to the Trust’s non-fundamental investment policies to broaden its primary investment focus to include taxable municipal securities generally. The BABs program expired on December 31, 2010 and was not renewed. Accordingly, there have been no new issuances of BABs since that date. Pursuant to the Contingent Review Provision, on June 12, 2015, the Board approved a proposal to amend the Trust’s 80% investment policy to include all taxable municipal securities, including BABs, and to change the name of the Trust, which changes became effective on August 25, 2015.

Leverage. The Trust may utilize leverage to seek to enhance the yield and net asset value of its common shares. However, this objective cannot be achieved in all interest rate environments. The Trust currently leverages its assets through the use of residual interest municipal tender option bonds (“TOB Residuals”), which are derivative interests in municipal bonds. The TOB Residuals in which the Trust will invest pay interest or income that, in the opinion of counsel to the issuer of such TOB Residuals, is exempt from regular U.S. federal income tax. The Trust may use combined economic leverage of up to 100% of its net assets (50% of its Managed Assets), all or a portion of which may be effected through the use of TOBs Residuals.

The Trust may utilize reverse repurchase agreements when it is anticipated that the interest income to be earned from the investment of the proceeds of the transaction is greater than the interest expense of the transaction.

The Trust may borrow through a credit facility.

The Trust may also borrow money as a temporary measure for extraordinary or emergency purposes, including the payment of dividends and the settlement of securities transactions which otherwise might require untimely dispositions of Trust securities.

Other Investment Policies. The Trust may invest up to 10% of its total assets in securities of other open- or closed-end investment companies (including exchange traded funds) that invest primarily in securities of the types in which the Trust may invest directly. The Trust may invest in investment companies that are advised by the Manager or its affiliates to the extent permitted by applicable law and/or pursuant to exemptive relief from the Securities and Exchange Commission.

During periods in which the Manager determines that it is temporarily unable to follow the Trust’s investment strategy or that it is impractical to do so, the Trust may deviate from its investment strategy and invest all or any portion of its assets in cash, cash equivalents or short-term debt securities that may be either tax-exempt or taxable.

The Trust may invest up to 10% of its total assets in preferred interests of other investment funds, including those which may pay dividends that are exempt from regular Federal income tax.

The Trust may invest up to 20% of its Managed Assets in securities rated below investment grade such as those rated Ba or below by Moody’s and BB or below by S&P or Fitch or in unrated securities determined by the Manager to be of comparable quality. These lower grade securities are commonly known as “junk bonds.” Securities rated below investment grade are judged to have speculative characteristics with respect to their interest and principal payments.

Risk Factors

This section contains a discussion of the general risks of investing in the Trust. The net asset value and market price of, and dividends paid on, the common shares will fluctuate with and be affected by, among other things, the risks more fully described below. As with any fund, there can be no guarantee that the Trust will meet its investment objective or that the Trust’s performance will be positive for any period of time.

Investment and Market Discount Risk — An investment in the Trust’s common shares is subject to investment risk, including the possible loss of the entire amount that you invest. As with any stock, the price of the Trust’s common shares will fluctuate with market conditions and other factors. If shares are sold, the price received may be more or less than the original investment. Common shares are designed for long-term investors and the Trust should not be treated as a trading vehicle. Shares of closed-end management investment companies frequently trade at a discount from their net asset value. This risk is separate and distinct from the risk that the Trust’s net asset value could decrease as a result of its investment activities. At any point in time an investment in the Trust’s common shares may be worth less than the original amount invested, even after taking into account distributions paid by the Trust. During periods in which the Trust may use leverage, the Trust’s investment, market discount and certain other risks will be magnified.

Debt Securities Risk — Debt securities, such as bonds, involve interest rate risk, credit risk, extension risk, and prepayment risk, among other things.

Interest Rate Risk — The market value of bonds and other fixed-income securities changes in response to interest rate changes and other factors. Interest rate risk is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall and decrease as interest rates rise.

The Trust may be subject to a greater risk of rising interest rates due to the current period of historically low rates. For example, if interest rates increase by 1%, assuming a current portfolio duration of ten years, and all other factors being equal, the value of the Trust’s investments would be expected to decrease by 10%. The magnitude of these fluctuations in the market price of bonds and other fixed-income securities is generally greater for those securities with longer maturities. Fluctuations in the market price of the Trust’s investments will not affect interest income derived from instruments already owned by the Trust, but will be reflected in the Trust’s net asset value. The Trust may lose money if short-term or long-term interest rates rise sharply in a manner not anticipated by Trust management.

32 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Trust Investment Objectives, Policies and Risks  (continued)

To the extent the Trust invests in debt securities that may be prepaid at the option of the obligor (such as mortgage-backed securities), the sensitivity of such securities to changes in interest rates may increase (to the detriment of the Trust) when interest rates rise. Moreover, because rates on certain floating rate debt securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Trust to the extent that it invests in floating rate debt securities.

These basic principles of bond prices also apply to U.S. Government securities. A security backed by the “full faith and credit” of the U.S. Government is guaranteed only as to its stated interest rate and face value at maturity, not its current market price. Just like other fixed-income securities, government-guaranteed securities will fluctuate in value when interest rates change.

A general rise in interest rates has the potential to cause investors to move out of fixed-income securities on a large scale, which may increase redemptions from funds that hold large amounts of fixed-income securities. Heavy redemptions could cause the Trust to sell assets at inopportune times or at a loss or depressed value and could hurt the Trust’s performance.

Credit Risk — Credit risk refers to the possibility that the issuer of a debt security (i.e., the borrower) will not be able to make payments of interest and principal when due. Changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may also affect the value of the Trust’s investment in that issuer. The degree of credit risk depends on both the financial condition of the issuer and the terms of the obligation.

Extension Risk — When interest rates rise, certain obligations will be paid off by the obligor more slowly than anticipated, causing the value of these obligations to fall.

Prepayment Risk — When interest rates fall, certain obligations will be paid off by the obligor more quickly than originally anticipated, and the Trust may have to invest the proceeds in securities with lower yields.

Build America Bonds Risk. Build America Bonds involve similar risks as municipal bonds, including credit and market risk. In particular, should a Build America Bond’s issuer fail to continue to meet the applicable requirements imposed on the bonds as provided by the ARRA , it is possible that such issuer may not receive federal cash subsidy payments, impairing the issuer’s ability to make scheduled interest payments. The Build America Bond program expired on December 31, 2010 and no further issuance is permitted unless Congress renews the program. As a result, the number of available Build America Bonds is limited, which may negatively affect the value of the Build America Bonds. In addition, there can be no assurance that Build America Bonds will be actively traded. It is difficult to predict the extent to which a market for such bonds will continue, meaning that Build America Bonds may experience greater illiquidity than other municipal obligations. The Build America Bonds outstanding as of December 31, 2010 will continue to be eligible for the federal interest rate subsidy, which continues for the life of the Build America Bonds; however, no bonds issued following expiration of the Build America Bond program will be eligible for the U.S. federal tax subsidy.

Municipal Securities Risks — Municipal securities risks include the ability of the issuer to repay the obligation, the relative lack of information about certain issuers of municipal securities, and the possibility of future legislative changes which could affect the market for and value of municipal securities. These risks include:

General Obligation Bonds Risks — Timely payments depend on the issuer’s credit quality, ability to raise tax revenues and ability to maintain an adequate tax base.

Revenue Bonds Risks — These payments depend on the money earned by the particular facility or class of facilities, or the amount of revenues derived from another source.

Private Activity Bonds Risks — Municipalities and other public authorities issue private activity bonds to finance development of industrial facilities for use by a private enterprise. The private enterprise pays the principal and interest on the bond, and the issuer does not pledge its faith, credit and taxing power for repayment. The Trust’s investments may consist of private activity bonds that may subject certain shareholders to an alternative minimum tax.

Moral Obligation Bonds Risks — Moral obligation bonds are generally issued by special purpose public authorities of a state or municipality. If the issuer is unable to meet its obligations, repayment of these bonds becomes a moral commitment, but not a legal obligation, of the state or municipality.

Municipal Notes Risks — Municipal notes are shorter term municipal debt obligations. If there is a shortfall in the anticipated proceeds, the notes may not be fully repaid and the Trust may lose money.

Municipal Lease Obligations Risks — In a municipal lease obligation, the issuer agrees to make payments when due on the lease obligation. Although the issuer does not pledge its unlimited taxing power for payment of the lease obligation, the lease obligation is secured by the leased property.

Tax-Exempt Status Risk — The Trust and its investment manager will rely on the opinion of issuers’ bond counsel and, in the case of derivative securities, sponsors’ counsel, on the tax-exempt status of interest on municipal bonds and payments under derivative securities. Neither the Trust nor its investment manager will independently review the bases for those tax opinions, which may ultimately be determined to be incorrect and subject the Trust and its shareholders to substantial tax liabilities.

Reinvestment Risk. Reinvestment risk is the risk that income from the Trust’s portfolio will decline if and when the Trust invests the proceeds from matured, traded or called municipal securities at market interest rates that are below the portfolio’s current earnings rate. A decline in income could affect the common shares’ market price or your overall returns.

Insurance Risk — Insurance guarantees that interest payments on a municipal security will be made on time and that the principal will be repaid when the security matures. However, insurance does not protect against losses caused by declines in a municipal security’s value. The Trust cannot be certain that any insurance company will make the payments it guarantees. If a municipal security’s insurer fails to fulfill its obligations or loses its credit rating, the value of the security could drop.

Junk Bonds Risk — Although junk bonds generally pay higher rates of interest than investment grade bonds, junk bonds are high risk investments that are considered speculative and may cause income and principal losses for the Trust.

TRUST INVESTMENT OBJECTIVES, POLICIES AND RISKS 33

Trust Investment Objectives, Policies and Risks  (continued)

Zero Coupon Securities Risk — While interest payments are not made on such securities, holders of such securities are deemed to have received income (“phantom income”) annually, notwithstanding that cash may not be received currently. The effect of owning instruments that do not make current interest payments is that a fixed yield is earned not only on the original investment but also, in effect, on all discount accretion during the life of the obligations. This implicit reinvestment of earnings at a fixed rate eliminates the risk of being unable to invest distributions at a rate as high as the implicit yield on the zero coupon bond, but at the same time eliminates the holder’s ability to reinvest at higher rates in the future. For this reason, some of these securities may be subject to substantially greater price fluctuations during periods of changing market interest rates than are comparable securities that pay interest currently. Longer term zero coupon bonds are more exposed to interest rate risk than shorter term zero coupon bonds. These investments benefit the issuer by mitigating its need for cash to meet debt service, but also require a higher rate of return to attract investors who are willing to defer receipt of cash.

When-Issued and Delayed Delivery Securities and Forward Commitments Risk — When-issued and delayed delivery securities and forward commitments involve the risk that the security the Trust buys will lose value prior to its delivery. There also is the risk that the security will not be issued or that the other party to the transaction will not meet its obligation. If this occurs, the Trust may lose both the investment opportunity for the assets it set aside to pay for the security and any gain in the security’s price.

Indexed and Inverse Securities Risk — Indexed and inverse securities provide a potential return based on a particular index of value or interest rates. The Trust’s return on these securities will be subject to risk with respect to the value of the particular index. These securities are subject to leverage risk and correlation risk. Certain indexed and inverse securities have greater sensitivity to changes in interest rates or index levels than other securities, and the Trust’s investment in such instruments may decline significantly in value if interest rates or index levels move in a way Trust management does not anticipate.

U.S. Government Obligations Risk — Certain securities in which the Trust may invest, including securities issued by certain U.S. Government agencies and U.S. Government sponsored enterprises, are not guaranteed by the U.S. Government or supported by the full faith and credit of the United States.

Economic Sector and Geographic Risk. The Trust, as a fundamental policy, may not invest 25% or more of the value of its Managed Assets in any one industry. However, this limitation does not apply to securities of the U.S. Government, any state government or their respective agencies, or instrumentalities and securities backed by the credit of any federal or state governmental entity. As such, the Trust may invest 25% of more of its Managed Assets in municipal securities of issuers in the same state (or U.S. Territory) or in the same economic sector. If the Trust does so, this may make it more susceptible to adverse economic, political or regulatory occurrences affecting a particular state or economic sector.

Repurchase Agreements and Purchase and Sale Contracts Risk — If the other party to a repurchase agreement or purchase and sale contract defaults on its obligation under the agreement, the Trust may suffer delays and incur costs or lose money in exercising its rights under the agreement. If the seller fails to repurchase the security in either situation and the market value of the security declines, the Trust may lose money.

Leverage Risk — The Trust utilizes leverage for investment purposes by entering into reverse repurchase agreements and derivative instruments with leverage embedded in then, such as TOB Residuals. The Trust’s use of leverage may increase or decrease from time to time in its discretion and the Trust may, in the future, determine not to use leverage.

The use of leverage creates an opportunity for increased common share net investment income dividends, but also creates risks for the holders of common shares. The Trust cannot assure you that the use of leverage will result in a higher yield on the common shares. Any leveraging strategy the Trust employs may not be successful.

Leverage involves risks and special considerations for common shareholders, including:

• the likelihood of greater volatility of net asset value, market price and dividend rate of the common shares than a comparable portfolio without leverage;

• the risk that fluctuations in interest rates or dividend rates on any leverage that the Trust must pay will reduce the return to the common shareholders;

• the effect of leverage in a declining market, which is likely to cause a greater decline in the net asset value of the common shares than if the Trust were not leveraged, which may result in a greater decline in the market price of the common shares;

• leverage may increase operating costs, which may reduce total return.

Any decline in the net asset value of the Trust’s investments will be borne entirely by the holders of common shares. Therefore, if the market value of the Trust’s portfolio declines, leverage will result in a greater decrease in net asset value to the holders of common shares than if the Trust were not leveraged. This greater net asset value decrease will also tend to cause a greater decline in the market price for the common shares.

Tender Option Bonds Risk — The Trust’s participation in tender option bond transactions may reduce the Trust’s returns and/or increase volatility. Investments in tender option bond transactions expose the Trust to counterparty risk and leverage risk. An investment in a tender option bond transaction typically will involve greater risk than an investment in a municipal fixed rate security, including the risk of loss of principal. Distributions on TOB Residuals will bear an inverse relationship to short-term municipal security interest rates. Distributions on TOB Residuals paid to the Trust will be reduced or, in the extreme, eliminated as short-term municipal interest rates rise and will increase when short-term municipal interest rates fall. TOB Residuals generally will underperform the market for fixed rate municipal securities in a rising interest rate environment. The Trust may invest special purpose trusts formed for the purpose of holding municipal bonds contributed by one or more funds (“TOB Trusts”) on either a non-recourse or recourse basis. If the Trust invests in a TOB Trust on a recourse basis, it could suffer losses in excess of the value of its TOB Residuals.

Reverse Repurchase Agreements Risk — Reverse repurchase agreements involve the sale of securities held by the Trust with an agreement to repurchase the securities at an agreed-upon price, date and interest payment. Reverse repurchase agreements involve the risk that the other party may fail to return the securities in a timely manner or at all. The Trust could lose money if it is unable to recover the securities and the value of the collateral held by the Trust, including the value of the investments made with cash collateral, is less than the value of the securities. These events could also trigger adverse tax consequences for the Trust. In addition, reverse repurchase agreements involve the risk that the interest income earned in the investment of the proceeds will be less than the interest expense.

34 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Trust Investment Objectives, Policies and Risks  (continued)

Illiquid Investments Risk — The Trust may invest without limitation in illiquid or less liquid investments or investments in which no secondary market is readily available or which are otherwise illiquid, including private placement securities. The Trust may not be able to readily dispose of such investments at prices that approximate those at which the Trust could sell such investments if they were more widely traded and, as a result of such illiquidity, the Trust may have to sell other investments or engage in borrowing transactions if necessary to raise cash to meet its obligations. Limited liquidity can also affect the market price of investments, thereby adversely affecting the Trust’s net asset value and ability to make dividend distributions. The financial markets in general, and certain segments of the mortgage-related securities markets in particular, have in recent years experienced periods of extreme secondary market supply and demand imbalance, resulting in a loss of liquidity during which market prices were suddenly and substantially below traditional measures of intrinsic value. During such periods, some investments could be sold only at arbitrary prices and with substantial losses. Periods of such market dislocation may occur again at any time. Privately issued debt securities are often of below investment grade quality, frequently are unrated and present many of the same risks as investing in below investment grade public debt securities.

Investment Companies and ETFs Risk — Subject to the limitations set forth in the Investment Company Act of 1940, as amended (the “1940 Act”), or as otherwise limited by the SEC, the Trust may acquire shares in other investment companies and in exchange-traded Trusts (“ETFs”), some of which may be affiliated investment companies. The market value of the shares of other investment companies and ETFs may differ from their net asset value. As an investor in investment companies and ETFs, the Trust would bear its ratable share of that entity’s expenses, including its investment advisory and administration fees, while continuing to pay its own advisory and administration fees and other expenses (to the extent not offset by the Manager through waivers). As a result, shareholders will be absorbing duplicate levels of fees with respect to investments in other investment companies and ETFs (to the extent not offset by the Manager through waivers).

The securities of other investment companies and ETFs in which the Trust may invest may be leveraged. As a result, the Trust may be indirectly exposed to leverage through an investment in such securities. An investment in securities of other investment companies and ETFs that use leverage may expose the Trust to higher volatility in the market value of such securities and the possibility that the Trust’s long-term returns on such securities (and, indirectly, the long-term returns of shares of the Trust) will be diminished.

As with other investments, investments in other investment companies, including ETFs, are subject to market and selection risk. To the extent the Trust is held by an affiliated Trust, the ability of the Trust itself to hold other investment companies may be limited.

Derivatives Risk — The Trust’s use of derivatives may increase its costs, reduce the Trust’s returns and/or increase volatility. Derivatives involve significant risks, including:

Volatility Risk — Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. A risk of the Trust’s use of derivatives is that the fluctuations in their values may not correlate with the overall securities markets.

Counterparty Risk — Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation.

Market and Illiquidity Risk — The possible lack of a liquid secondary market for derivatives and the resulting inability of the Trust to sell or otherwise close a derivatives position could expose the Trust to losses and could make derivatives more difficult for the Trust to value accurately.

Valuation Risk — Valuation may be more difficult in times of market turmoil since many investors and market makers may be reluctant to purchase complex instruments or quote prices for them.

Hedging Risk — Hedges are sometimes subject to imperfect matching between the derivative and the underlying security, and there can be no assurance that the Trust’s hedging transactions will be effective. The use of hedging may result in certain adverse tax consequences.

Tax Risk — Certain aspects of the tax treatment of derivative instruments, including swap agreements and commodity-linked derivative instruments, are currently unclear and may be affected by changes in legislation, regulations or other legally binding authority. Such treatment may be less favorable than that given to a direct investment in an underlying asset and may adversely affect the timing, character and amount of income the Trust realizes from its investments.

Regulatory Risk — Derivative contracts, including, without limitation, swaps, currency forwards and non-deliverable forwards, are subject to regulation under the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”) in the United States and under comparable regimes in Europe, Asia and other non-U.S. jurisdictions. Under the Dodd-Frank Act, certain derivatives are subject to margin requirements and swap dealers are required to collect margin from the Trust with respect to such derivatives. Specifically, regulations are now in effect that require swap dealers to post and collect variation margin (comprised of specified liquid instruments and subject to a required haircut) in connection with trading of OTC swaps with the Trust. Shares of investment companies (other than certain money market funds) may not be posted as collateral under these regulations. Requirements for posting of initial margin in connection with OTC swaps will be phased-in through at least 2021. In addition, regulations adopted by global prudential regulators that are now in effect require certain bank-regulated counterparties and certain of their affiliates to include in certain financial contracts, including many derivatives contracts, terms that delay or restrict the rights of counterparties, such as the Trust, to terminate such contracts, foreclose upon collateral, exercise other default rights or restrict transfers of credit support in the event that the counterparty and/or its affiliates are subject to certain types of resolution or insolvency proceedings. The implementation of these requirements with respect to derivatives, as well as regulations under the Dodd-Frank Act regarding clearing, mandatory trading and margining of other derivatives, may increase the costs and risks to the Trust of trading in these instruments and, as a result, may affect returns to investors in the Trust.

TRUST INVESTMENT OBJECTIVES, POLICIES AND RISKS 35

Trust Investment Objectives, Policies and Risks  (continued)

In November 2019, the SEC proposed new regulations governing the use of derivatives by registered investment companies. If adopted as proposed, new Rule 18f-4 would impose limits on the amount of derivatives a fund could enter into, eliminate the asset segregation framework currently used by funds to comply with Section 18 of the 1940 Act, treat derivatives as senior securities so that a failure to comply with the proposed limits would result in a statutory violation and require funds whose use of derivatives is more than a limited specified exposure amount to establish and maintain a comprehensive derivatives risk management program and appoint a derivatives risk manager.

Market Risk and Selection Risk — Market risk is the risk that one or more markets in which the Trust invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. The value of a security or other asset may decline due to changes in general market conditions, economic trends or events that are not specifically related to the issuer of the security or other asset, or factors that affect a particular issuer or issuers, exchange, country, group of countries, region, market, industry, group of industries, sector or asset class. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues like pandemics or epidemics, recessions, or other events could have a significant impact on the Trust and its investments. Selection risk is the risk that the securities selected by Trust management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.

A recent outbreak of an infectious coronavirus has developed into a global pandemic that has resulted in numerous disruptions in the market and has had significant economic impact leaving general concern and uncertainty. The impact of this coronavirus, and other epidemics and pandemics that may arise in the future, could affect the economies of many nations, individual companies and the market in general ways that cannot necessarily be foreseen at the present time.

36 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Automatic Dividend Reinvestment Plan

Pursuant to the Trust’s Dividend Reinvestment Plan (the “Reinvestment Plan”), Common Shareholders are automatically enrolled to have all distributions of dividends and capital gains and other distributions reinvested by Computershare Trust Company, N.A. (the “Reinvestment Plan Agent”) in the Trust’s Common Shares pursuant to the Reinvestment Plan. Shareholders who do not participate in the Reinvestment Plan will receive all distributions in cash paid by check and mailed directly to the shareholders of record (or if the shares are held in street name or other nominee name, then to the nominee) by the Reinvestment Plan Agent, which serves as agent for the shareholders in administering the Reinvestment Plan.

After the Trust declares a dividend or determines to make a capital gain or other distribution, the Reinvestment Plan Agent will acquire shares for the participants’ accounts, depending upon the following circumstances, either (i) through receipt of unissued but authorized shares from the Trust (“newly issued shares”) or (ii) by purchase of outstanding shares on the open market or on the Trust’s primary exchange (“open-market purchases”). If, on the dividend payment date, the net asset value per share (“NAV”) is equal to or less than the market price per share plus estimated brokerage commissions (such condition often referred to as a “market premium”), the Reinvestment Plan Agent will invest the dividend amount in newly issued shares acquired on behalf of the participants. The number of newly issued shares to be credited to each participant’s account will be determined by dividing the dollar amount of the dividend by the NAV on the date the shares are issued. However, if the NAV is less than 95% of the market price on the dividend payment date, the dollar amount of the dividend will be divided by 95% of the market price on the dividend payment date. If, on the dividend payment date, the NAV is greater than the market price per share plus estimated brokerage commissions (such condition often referred to as a “market discount”), the Reinvestment Plan Agent will invest the dividend amount in shares acquired on behalf of the participants in open-market purchases. If the Reinvestment Plan Agent is unable to invest the full dividend amount in open-market purchases, or if the market discount shifts to a market premium during the purchase period, the Reinvestment Plan Agent will invest any un-invested portion in newly issued shares. Investments in newly issued shares made in this manner would be made pursuant to the same process described above and the date of issue for such newly issued shares will substitute for the dividend payment date.

You may elect not to participate in the Reinvestment Plan and to receive all dividends in cash by contacting the Reinvestment Plan Agent, at the address set forth below.

Participation in the Reinvestment Plan is completely voluntary and may be terminated or resumed at any time without penalty by notice if received and processed by the Reinvestment Plan Agent prior to the dividend record date. Additionally, the Reinvestment Plan Agent seeks to process notices received after the record date but prior to the payable date and such notices often will become effective by the payable date. Where late notices are not processed by the applicable payable date, such termination or resumption will be effective with respect to any subsequently declared dividend or other distribution.

The Reinvestment Plan Agent’s fees for the handling of the reinvestment of distributions will be paid by the Trust. However, each participant will pay a pro rata share of brokerage commissions incurred with respect to the Reinvestment Plan Agent’s open-market purchases in connection with the reinvestment of all distributions. The automatic reinvestment of all distributions will not relieve participants of any U.S. federal, state or local income tax that may be payable on such dividends or distributions.

The Trust reserves the right to amend or terminate the Reinvestment Plan. There is no direct service charge to participants in the Reinvestment Plan; however, the Trust reserves the right to amend the Reinvestment Plan to include a service charge payable by the participants. Participants that request a sale of shares are subject to a $2.50 sales fee and a $0.15 per share sold brokerage commission fee. All correspondence concerning the Reinvestment Plan should be directed to Computershare Trust Company, N.A. through the internet at computershare.com/blackrock, or in writing to Computershare, P.O. Box 505000, Louisville, KY 40233, Telephone: (800) 699-1236. Overnight correspondence should be directed to the Reinvestment Plan Agent at Computershare, 462 South 4^th Street, Suite 1600, Louisville, KY 40202.

AUTOMATIC DIVIDEND REINVESTMENT PLAN 37

Trustee and Officer Information

Independent Trustees (a)
Name Year of Birth (b)	Position(s) Held (Length of Service) (c)	Principal Occupation(s) During Past Five Years	Number of BlackRock-Advised Registered Investment Companies (“RICs”)  Consisting of Investment Portfolios (“Portfolios”) Overseen (d)	Public Company and Other Investment Company Directorships Held During Past Five Years
Richard E. Cavanagh 1946	Co-Chair of the Board and Trustee (Since 2007)	Director, The Guardian Life Insurance Company of America since 1998; Board Chair, Volunteers of America (a not-for-profit organization) from 2015 to 2018 (board member since 2009); Director, Arch Chemicals (chemical and allied products) from 1999 to 2011; Trustee, Educational Testing Service from 1997 to 2009 and Chairman thereof from 2005 to 2009; Senior Advisor, The Fremont Group since 2008 and Director thereof since 1996; Faculty Member/Adjunct Lecturer, Harvard University since 2007 and Executive Dean from 1987 to 1995; President and Chief Executive Officer, The Conference Board, Inc. (global business research organization) from 1995 to 2007.	86 RICs consisting of 110 Portfolios	None
Karen P. Robards 1950	Co-Chair of the Board and Trustee (Since 2007)	Principal of Robards & Company, LLC (consulting and private investing) since 1987; Co-founder and Director of the Cooke Center for Learning and Development (a not-for-profit organization) since 1987; Director of Enable Injections, LLC (medical devices) since 2019; Investment Banker at Morgan Stanley from 1976 to 1987.	86 RICs consisting of 110 Portfolios	Greenhill & Co., Inc.; AtriCure, Inc. (medical devices) from 2000 until 2017
Michael J. Castellano 1946	Trustee (Since 2011)	Chief Financial Officer of Lazard Group LLC from 2001 to 2011; Chief Financial Officer of Lazard Ltd from 2004 to 2011; Director, Support Our Aging Religious (non-profit) from 2009 to June 2015 and since 2017; Director, National Advisory Board of Church Management at Villanova University since 2010; Trustee, Domestic Church Media Foundation since 2012; Director, CircleBlack Inc. (financial technology company) since 2015.	86 RICs consisting of 110 Portfolios	None
Cynthia L. Egan 1955	Trustee (Since 2016)	Advisor, U.S. Department of the Treasury from 2014 to 2015; President, Retirement Plan Services, for T. Rowe Price Group, Inc. from 2007 to 2012; executive positions within Fidelity Investments from 1989 to 2007.	86 RICs consisting of 110 Portfolios	Unum (insurance); The Hanover Insurance Group (insurance); Envestnet (investment platform) from 2013 until 2016
Frank J. Fabozzi (d) 1948	Trustee (Since 2007)	Editor of The Journal of Portfolio Management since 1986; Professor of Finance, EDHEC Business School (France) since 2011; Visiting Professor, Princeton University for the 2013 to 2014 academic year and Spring 2017 semester; Professor in the Practice of Finance, Yale University School of Management from 1994 to 2011 and currently a Teaching Fellow in Yale’s Executive Programs; Board Member, BlackRock Equity-Liquidity Funds from 2014 to 2016; affiliated professor Karlsruhe Institute of Technology from 2008 to 2011; Visiting Professor, Rutgers University for the Spring 2019 semester; Visiting Professor, New York University for the 2019 academic year.	87 RICs consisting of 111 Portfolios	None
R. Glenn Hubbard 1958	Trustee (Since 2007)	Dean, Columbia Business School from 2004 to 2019; Faculty member, Columbia Business School since 1988.	86 RICs consisting of 110 Portfolios	ADP (data and information services); Metropolitan Life Insurance Company (insurance); KKR Financial Corporation (finance) from 2004 until 2014

38 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Trustee and Officer Information  (continued)

Independent Trustees (a) (continued)
Name Year of Birth (b)	Position(s) Held (Length of Service) (c)	Principal Occupation(s) During Past Five Years	Number of BlackRock-Advised Registered Investment Companies (“RICs”)  Consisting of Investment Portfolios (“Portfolios”) Overseen (d)	Public Company and Other Investment Company Directorships Held During Past Five Years
W. Carl Kester (d) 1951	Trustee (Since 2007)	George Fisher Baker Jr. Professor of Business Administration, Harvard Business School since 2008; Deputy Dean for Academic Affairs from 2006 to 2010; Chairman of the Finance Unit, from 2005 to 2006; Senior Associate Dean and Chairman of the MBA Program from 1999 to 2005; Member of the faculty of Harvard Business School since 1981.	87 RICs consisting of 111 Portfolios	None
Catherine A. Lynch (d) 1961	Trustee (Since 2016)	Chief Executive Officer, Chief Investment Officer and various other positions, National Railroad Retirement Investment Trust from 2003 to 2016; Associate Vice President for Treasury Management, The George Washington University from 1999 to 2003; Assistant Treasurer, Episcopal Church of America from 1995 to 1999.	87 RICs consisting of 111 Portfolios	None
Interested Trustees (a)(e)
Name Year of Birth  (b)	Position(s) Held (Length of Service) (c)	Principal Occupation(s) During Past Five Years	Number of BlackRock-Advised Registered Investment Companies (“RICs”)  Consisting of Investment Portfolios (“Portfolios”) Overseen  (d)	Public Company and Other Investment Company Directorships Held During Past Five Years
Robert Fairbairn 1965	Trustee (Since 2018)	Vice Chairman of BlackRock, Inc. since 2019; Member of BlackRock’s Global Executive and Global Operating Committees; Co-Chair of BlackRock’s Human Capital Committee; Senior Managing Director of BlackRock, Inc. from 2010 to 2019; oversaw BlackRock’s Strategic Partner Program and Strategic Product Management Group from 2012 to 2019; Member of the Board of Managers of BlackRock Investments, LLC from 2011 to 2018; Global Head of BlackRock’s Retail and iShares® businesses from 2012 to 2016.	122 RICs consisting of 265 Portfolios	None
John M. Perlowski (d) 1964	Trustee (Since 2015); President and Chief Executive Officer (Since 2010)	Managing Director of BlackRock, Inc. since 2009; Head of BlackRock Global Accounting and Product Services since 2009; Advisory Director of Family Resource Network (charitable foundation) since 2009.	123 RICs consisting of 266 Portfolios	None
(a) The address of each Trustee is c/o BlackRock, Inc., 55 East 52nd Street, New York, New York 10055. (b) Each Independent Trustee holds office until his or her successor is duly elected and qualifies or until his or her earlier death, resignation, retirement or removal as provided by the Trust’s by-laws or charter or statute, or until December 31 of the year in which he or she turns 75. Trustees who are “interested persons,” as defined in the Investment Company Act serve until their successor is duly elected and qualifies or until their earlier death, resignation, retirement or removal as provided by the Trust’s by-laws or statute, or until December 31 of the year in which they turn 72. The Board may determine to extend the terms of Independent Trustees on a case-by-case basis, as appropriate. (c) Following the combination of Merrill Lynch Investment Managers, L.P. (“MLIM”) and BlackRock, Inc. in September 2006, the various legacy MLIM and legacy BlackRock fund boards were realigned and consolidated into three new fund boards in 2007. Certain Independent Trustees first became members of the boards of other legacy MLIM or legacy BlackRock funds as follows: Richard E. Cavanagh, 1994; Frank J. Fabozzi, 1988; R. Glenn Hubbard, 2004; W. Carl Kester, 1995; and Karen P. Robards, 1998. (d) Dr. Fabozzi, Dr. Kester, Ms. Lynch and Mr. Perlowski are also trustees of the BlackRock Credit Strategies Fund. (e) Mr. Fairbairn and Mr. Perlowski are both “interested persons,” as defined in the Investment Company Act 1940 Act, of the Trust based on their positions with BlackRock, Inc. and its affiliates. Mr. Fairbairn and Mr. Perlowski are also board members of the BlackRock Multi-Asset Complex.

TRUSTEE AND OFFICER INFORMATION 39

Trustee and Officer Information  (continued)

Officers Who Are Not Trustees (a)
Name Year of Birth (b)	Position(s) Held (Length of Service)	Principal Occupation(s) During Past Five Years
Jonathan Diorio 1980	Vice President (Since 2015)	Managing Director of BlackRock, Inc. since 2015; Director of BlackRock, Inc. from 2011 to 2015.
Neal J. Andrews 1966	Chief Financial Officer (Since 2007)	Chief Financial Officer of the iShares® exchange traded funds from 2019 to 2020; Managing Director of BlackRock, Inc. since 2006.
Jay M. Fife 1970	Treasurer (Since 2007)	Managing Director of BlackRock, Inc. since 2007.
Charles Park 1967	Chief Compliance Officer (Since 2014)	Anti-Money Laundering Compliance Officer for certain BlackRock-advised Funds from 2014 to 2015; Chief Compliance Officer of BlackRock Advisors, LLC and the BlackRock-advised Funds in the BlackRock Multi-Asset Complex and the BlackRock Fixed-Income Complex since 2014; Principal of and Chief Compliance Officer for iShares® Delaware Trust Sponsor LLC since 2012 and BlackRock Fund Advisors (“BFA”) since 2006; Chief Compliance Officer for the BFA-advised iShares® exchange traded funds since 2006; Chief Compliance Officer for BlackRock Asset Management International Inc. since 2012.
Janey Ahn 1975	Secretary (Since 2012)	Managing Director of BlackRock, Inc. since 2018; Director of BlackRock, Inc. from 2009 to 2017.
(a) The address of each Officer is c/o BlackRock, Inc., 55 East 52nd Street, New York, New York 10055. (b) Officers of the Trust serve at the pleasure of the Board.

Investment Adviser

BlackRock Advisors, LLC

Wilmington, DE 19809

Accounting Agent and Custodian

State Street Bank and Trust Company

Boston, MA 02111

Transfer Agent

Computershare Trust Company, N.A.

Canton, MA 02021

Independent Registered Public Accounting Firm

Deloitte & Touche LLP

Boston, MA 02116

Legal Counsel

Willkie Farr & Gallagher LLP

New York, NY 10019

Address of the Trust

100 Bellevue Parkway

Wilmington, DE 19809

40 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Additional Information

Proxy Results

The Annual Meeting of Shareholders was held on July 27, 2020 for shareholders of record on May 29, 2020, to elect trustee nominees for the Trust. There were no broker non-votes with regard to the Trust.

Shareholders elected the Class I Trustees as follows:

Michael J. Castellano

R. Glenn Hubbard

John M. Perlowski

W. Carl Kester

Votes For

Votes Withheld

Votes For

Votes Withheld

Votes For

Votes Withheld

Votes For

Votes Withheld

BBN

47,472,598

774,250

47,429,285

817,563

47,493,701

753,147

47,454,934

791,914

For the Trust listed above, Trustees whose term of office continued after the Annual Meeting of Shareholders because they were not up for election are Richard E. Cavanagh, Cynthia L. Egan, Robert Fairbairn, Catherine A. Lynch, Karen P. Robards and Frank J. Fabozzi.

Trust Certification

The Trust is listed for trading on the NYSE and has filed with the NYSE its annual chief executive officer certification regarding compliance with the NYSE’s listing standards. The Trust filed with the SEC the certification of its chief executive officer and chief financial officer required by section 302 of the Sarbanes-Oxley Act.

Dividend Policy

The Trust’s dividend policy is to distribute all or a portion of its net investment income to its shareholders on a monthly basis. In order to provide shareholders with a more stable level of distributions, the Trust may at times pay out less than the entire amount of net investment income earned in any particular month/quarter and may at times in any particular month/quarter pay out such accumulated but undistributed income in addition to net investment income earned in that month/quarter. As a result, the distributions paid by the Trust for any particular month/quarter may be more or less than the amount of net investment income earned by the Trust during such month/quarter. The Trust’s current accumulated but undistributed net investment income, if any, is disclosed as accumulated earnings (loss) in the Statement of Assets and Liabilities, which comprises part of the financial information included in this report.

General Information

The Trust does not make available copies of its Statement of Additional Information because the Trust’s shares are not continuously offered, which means that the Statement of Additional Information of the Trust has not been updated after completion of the Trust’s offerings and the information contained in the Trust’s Statement of Additional Information may have become outdated.

Except if noted otherwise herein, there were no changes to the Trust’s charter or by-laws that would delay or prevent a change of control of the Trust that were not approved by the shareholders. Except if noted otherwise herein, there have been no changes in the persons who are primarily responsible for the day-to-day management of the Trust’s portfolios.

In accordance with Section 23(c) of the Investment Company Act of 1940, the Trust may from time to time purchase shares of its common stock in the open market or in private transactions.

Quarterly performance, semi-annual and annual reports, current net asset value and other information regarding the Trust may be found on BlackRock’s website, which can be accessed at blackrock.com. Any reference to BlackRock’s website in this report is intended to allow investors public access to information regarding the Trust and does not, and is not intended to, incorporate BlackRock’s website in this report.

Electronic Delivery

Shareholders can sign up for e-mail notifications of quarterly statements, annual and semi-annual shareholder reports by enrolling in the electronic delivery program. Electronic copies of shareholder reports are available on BlackRock’s website.

To enroll in electronic delivery:

Shareholders Who Hold Accounts with Investment Advisers, Banks or Brokerages:

Please contact your financial advisor. Please note that not all investment advisers, banks or brokerages may offer this service.

Householding

The Trust will mail only one copy of shareholder documents, including annual and semi-annual reports and proxy statements, to shareholders with multiple accounts at the same address. This practice is commonly called “householding” and is intended to reduce expenses and eliminate duplicate mailings of shareholder documents. Mailings of your shareholder documents may be householded indefinitely unless you instruct us otherwise. If you do not want the mailing of these documents to be combined with those for other members of your household, please call the Trust at (800) 882-0052.

ADDITIONAL INFORMATION 41

Additional Information  (continued)

Availability of Quarterly Schedule of Investments

The Trust files its complete schedule of portfolio holdings with the SEC for the first and third quarters of each fiscal year as an exhibit to its reports on Form N-PORT. The Trust’s Forms N-PORT and N-Q are available on the SEC’s website at sec.gov.

Availability of Proxy Voting Policies and Procedures

A description of the policies and procedures that the Trust uses to determine how to vote proxies relating to portfolio securities is available upon request and without charge (1) by calling (800) 882-0052; (2) at blackrock.com; and (3) on the SEC’s website at sec.gov.

Availability of Proxy Voting Record

Information about how the Trust voted proxies relating to securities held in the Trust’s portfolio during the most recent 12-month period ended June 30 is available upon request and without charge (1) at blackrock.com; or by calling (800) 882-0052; and (2) on the SEC’s website at sec.gov.

Availability of Trust Updates

BlackRock will update performance and certain other data for the Trust on a monthly basis on its website in the “Closed-end Funds” section of blackrock.com as well as certain other material information as necessary from time to time. Investors and others are advised to check the website for updated performance information and the release of other material information about the Trust. This reference to BlackRock’s website is intended to allow investors public access to information regarding the Trust and does not, and is not intended to, incorporate BlackRock’s website in this report.

BlackRock Privacy Principles

BlackRock is committed to maintaining the privacy of its current and former fund investors and individual clients (collectively, “Clients”) and to safeguarding their non-public personal information. The following information is provided to help you understand what personal information BlackRock collects, how we protect that information and why in certain cases we share such information with select parties.

If you are located in a jurisdiction where specific laws, rules or regulations require BlackRock to provide you with additional or different privacy-related rights beyond what is set forth below, then BlackRock will comply with those specific laws, rules or regulations.

BlackRock obtains or verifies personal non-public information from and about you from different sources, including the following: (i) information we receive from you or, if applicable, your financial intermediary, on applications, forms or other documents; (ii) information about your transactions with us, our affiliates, or others; (iii) information we receive from a consumer reporting agency; and (iv) from visits to our websites.

BlackRock does not sell or disclose to non-affiliated third parties any non-public personal information about its Clients, except as permitted by law or as is necessary to respond to regulatory requests or to service Client accounts. These non-affiliated third parties are required to protect the confidentiality and security of this information and to use it only for its intended purpose.

We may share information with our affiliates to service your account or to provide you with information about other BlackRock products or services that may be of interest to you. In addition, BlackRock restricts access to non-public personal information about its Clients to those BlackRock employees with a legitimate business need for the information. BlackRock maintains physical, electronic and procedural safeguards that are designed to protect the non-public personal information of its Clients, including procedures relating to the proper storage and disposal of such information.

Glossary of Terms Used in this Report

Portfolio Abbreviations
AGM	Assured Guaranty Municipal Corp.
ARB	Airport Revenue Bonds
COP	Certificates of Participation
EDA	Economic Development Authority
GO	General Obligation Bonds
GTD	Guaranteed
HFA	Housing Finance Agency
ISD	Independent School District
LRB	Lease Revenue Bonds

Portfolio Abbreviations (continued)
M/F	Multi-Family
NPFGC	National Public Finance Guarantee Corp.
PSF-GTD	Permanent School Fund Guaranteed
RB	Revenue Bonds

42 2020 BLACKROCK ANNUAL REPORT TO SHAREHOLDERS

Want to know more?

blackrock.com    |    800-882-0052

This report is intended for current holders. It is not a prospectus. Past performance results shown in this report should not be considered a representation of future performance. The Trust has leveraged its Common Shares, which creates risks for Common Shareholders, including the likelihood of greater volatility of net asset value and market price of the Common Shares, and the risk that fluctuations in short-term interest rates may reduce the Common Shares’ yield. Statements and other information herein are as dated and are subject to change.

TAXMB-7/20-AR

Item 2    – Code of Ethics – The registrant (or the “Fund”) has adopted a code of ethics, as of the end of the period covered by this report, applicable to the registrant’s principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions. During the period covered by this report, the code of ethics was amended to update certain information and to make other non-material changes. During the period covered by this report, there have been no waivers granted under the code of ethics. The registrant undertakes to provide a copy of the code of ethics to any person upon request, without charge, who calls 1-800-882-0052, option 4.

Item 3    – Audit Committee Financial Expert – The registrant’s board of directors (the “board of directors”), has determined that (i) the registrant has the following audit committee financial experts serving on its audit committee and (ii) each audit committee financial expert is independent:

Michael Castellano

Frank J. Fabozzi

Catherine A. Lynch

Karen P. Robards

The registrant’s board of directors has determined that Karen P. Robards qualifies as an audit committee financial expert pursuant to Item 3(c)(4) of Form N-CSR.

Ms. Robards has a thorough understanding of generally accepted accounting principles, financial statements and internal control over financial reporting as well as audit committee functions. Ms. Robards has been President of Robards & Company, a financial advisory firm, since 1987. Ms. Robards was formerly an investment banker for more than 10 years where she was responsible for evaluating and assessing the performance of companies based on their financial results. Ms. Robards has over 30 years of experience analyzing financial statements. She also is a member of the audit committee of one publicly held company and a non-profit organization.

Under applicable securities laws, a person determined to be an audit committee financial expert will not be deemed an “expert” for any purpose, including without limitation for the purposes of Section 11 of the Securities Act of 1933, as a result of being designated or identified as an audit committee financial expert. The designation or identification of a person as an audit committee financial expert does not impose on such person any duties, obligations, or liabilities greater than the duties, obligations, and liabilities imposed on such person as a member of the audit committee and board of directors in the absence of such designation or identification. The designation or identification of a person as an audit committee financial expert does not affect the duties, obligations, or liability of any other member of the audit committee or board of directors.

Item 4    – Principal Accountant Fees and Services

The following table presents fees billed by Deloitte & Touche LLP (“D&T”) in each of the last two fiscal years for the services rendered to the Fund:

	(a) Audit Fees		(b) Audit-Related Fees1		(c) Tax Fees2		(d) All Other Fees
Entity Name	Current	Previous	Current	Previous	Current	Previous	Current	Previous

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	Fiscal Year     End	Fiscal Year     End	Fiscal Year     End	Fiscal Year     End	Fiscal Year     End	Fiscal Year     End	Fiscal Year     End	Fiscal Year     End
BlackRock Taxable Municipal Bond Trust	$35,700	$35,700	$0	$0	$14,900	$15,400	$0	$0

The following table presents fees billed by D&T that were required to be approved by the registrant’s audit committee (the “Committee”) for services that relate directly to the operations or financial reporting of the Fund and that are rendered on behalf of BlackRock Advisors, LLC (“Investment Adviser” or “BlackRock”) and entities controlling, controlled by, or under common control with BlackRock (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser) that provide ongoing services to the Fund (“Affiliated Service Providers”):

	Current Fiscal Year End	Previous Fiscal Year End
(b) Audit-Related Fees1	$0	$0
(c) Tax Fees2	$0	$0
(d) All Other Fees3	$1,984,000	$2,050,500

¹ The nature of the services includes assurance and related services reasonably related to the performance of the audit or review of financial statements not included in Audit Fees, including accounting consultations, agreed-upon procedure reports, attestation reports, comfort letters, out-of-pocket expenses and internal control reviews not required by regulators.

² The nature of the services includes tax compliance and/or tax preparation, including services relating to the filing or amendment of federal, state or local income tax returns, regulated investment company qualification reviews, taxable income and tax distribution calculations.

³ Non-audit fees of $1,984,000 and $2,050,500 for the current fiscal year and previous fiscal year, respectively, were paid to the Fund’s principal accountant in their entirety by BlackRock, in connection with services provided to the Affiliated Service Providers of the Fund and of certain other funds sponsored and advised by BlackRock or its affiliates for a service organization review and an accounting research tool subscription. These amounts represent aggregate fees paid by BlackRock and were not allocated on a per fund basis.

(e)(1) Audit Committee Pre-Approval Policies and Procedures:

The Committee has adopted policies and procedures with regard to the pre-approval of services. Audit, audit-related and tax compliance services provided to the registrant on an annual basis require specific pre-approval by the Committee. The Committee also must approve other non-audit services provided to the registrant and those non-audit services provided to the Investment Adviser and Affiliated Service Providers that relate directly to the operations and the financial reporting of the registrant. Certain of these non-audit services that the Committee believes are (a) consistent with the SEC’s auditor independence rules and (b) routine and recurring services that will not impair the independence of the independent accountants may be approved by the Committee without consideration on a specific case-by-case basis (“general pre-approval”). The term of any general pre-approval is 12 months from the date of the pre-approval, unless the Committee provides for a different period. Tax or other non-audit services provided to the registrant which have a direct impact on the operations or financial reporting of the registrant will only be deemed pre-approved provided that any individual project does not exceed $10,000 attributable to the registrant or $50,000 per project. For this purpose, multiple projects will be aggregated to determine if they exceed the previously mentioned cost levels.

Any proposed services exceeding the pre-approved cost levels will require specific pre-approval by the Committee, as will any other services not subject to general pre-approval (e.g., unanticipated but permissible services). The Committee is informed of each service approved subject to general pre-approval at the next regularly scheduled in-person board meeting. At this meeting, an analysis of such services is presented to the Committee for ratification. The Committee

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may delegate to the Committee Chairman the authority to approve the provision of and fees for any specific engagement of permitted non-audit services, including services exceeding pre-approved cost levels.

(e)(2) None of the services described in each of Items 4(b) through (d) were approved by the Committee pursuant to the de minimis exception in paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X.

(f) Not Applicable

(g) ) The aggregate non-audit fees, defined as the sum of the fees shown under “Audit-Related Fees,” “Tax Fees” and “All Other Fees,” paid to the accountant for services rendered by the accountant to the registrant, the Investment Adviser and the Affiliated Service Providers were:

Entity Name	Current Fiscal     Year End	Previous Fiscal     Year End
BlackRock Taxable Municipal Bond Trust	$14,900	$15,400

Additionally, the amounts billed by D&T in connection with services provided to the Affiliated Service Providers of the Fund and of other funds sponsored or advised by BlackRock or its affiliates during the current and previous fiscal years for a service organization review and an accounting research tool subscription were:

Current Fiscal Year End	Previous Fiscal Year End
$1,984,000	$2,050,500

These amounts represent aggregate fees paid by BlackRock and were not allocated on a per fund basis.

(h) The Committee has considered and determined that the provision of non-audit services that were rendered to the Investment Adviser, and the Affiliated Service Providers that were not pre-approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant’s independence.

Item 5    – Audit Committee of Listed Registrant

(a) The following individuals are members of the registrant’s separately designated standing audit committee established in accordance with Section 3(a)(58)(A) of the Securities Exchange Act of 1934 (15 U.S.C. 78c(a)(58)(A)):

Michael Castellano

Frank J. Fabozzi

Catherine A. Lynch

Karen P. Robards

(b) Not Applicable

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Item 6    – Investments

(a) The registrant’s Schedule of Investments is included as part of the Report to Stockholders filed under Item 1 of this Form.

(b) Not Applicable due to no such divestments during the semi-annual period covered since the previous Form N-CSR filing.

Item 7    – Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies – The board of directors has delegated the voting of proxies for the Fund’s portfolio securities to the Investment Adviser pursuant to the Investment Adviser’s proxy voting guidelines. Under these guidelines, the Investment Adviser will vote proxies related to Fund securities in the best interests of the Fund and its stockholders. From time to time, a vote may present a conflict between the interests of the Fund’s stockholders, on the one hand, and those of the Investment Adviser, or any affiliated person of the Fund or the Investment Adviser, on the other. In such event, provided that the Investment Adviser’s Equity Investment Policy Oversight Committee, or a sub-committee thereof (the “Oversight Committee”) is aware of the real or potential conflict or material non-routine matter and if the Oversight Committee does not reasonably believe it is able to follow its general voting guidelines (or if the particular proxy matter is not addressed in the guidelines) and vote impartially, the Oversight Committee may retain an independent fiduciary to advise the Oversight Committee on how to vote or to cast votes on behalf of the Investment Adviser’s clients. If the Investment Adviser determines not to retain an independent fiduciary, or does not desire to follow the advice of such independent fiduciary, the Oversight Committee shall determine how to vote the proxy after consulting with the Investment Adviser’s Portfolio Management Group and/or the Investment Adviser’s Legal and Compliance Department and concluding that the vote cast is in its client’s best interest notwithstanding the conflict. A copy of the Fund’s Proxy Voting Policy and Procedures are attached as Exhibit 99.PROXYPOL, a copy of the Fund’s Global Corporate Governance  & Engagement Principles are attached as Exhibit 99.GLOBAL.CORP.GOV and a copy of the Fund’s Corporate Governance and Proxy Voting Guidelines for U.S. Securities are attached as Exhibit 99.US.CORP.GOV. Information on how the Fund voted proxies relating to portfolio securities during the most recent 12-month period ended June 30 is available without charge, (i) at www.blackrock.com and (ii) on the SEC’s website at http://www.sec.gov.

Item 8    – Portfolio Managers of Closed-End Management Investment Companies

(a)(1) As of the date of filing this Report:

The registrant is managed by a team of investment professionals comprised of Peter J. Hayes, Managing Director at BlackRock, Theodore R. Jaeckel, Jr., CFA, Managing Director at BlackRock, Michael A. Kalinoski, CFA, Director at BlackRock and Christian Romaglino, Director at BlackRock. Each is a member of BlackRock’s municipal tax-exempt management group. Each is jointly responsible for the day-to-day management of the registrant’s portfolio, which includes setting the registrant’s overall investment strategy, overseeing the management of the registrant and/or selection of its investments. Messrs. Hayes, Jaeckel and Kalinoski have been members of the registrant’s portfolio management team since 2010, and Mr. Romaglino has been a member of the registrant’s portfolio management team since 2017.

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Portfolio Manager	Biography
Peter J. Hayes	Managing Director of BlackRock since 2006; Head of Municipal Bonds within BlackRock’s Fixed Income Portfolio Management Group since 2006; Managing Director of Merrill Lynch Investment Managers, L.P. (“MLIM”) from 2000 to 2006.
Theodore R. Jaeckel, Jr., CFA	Managing Director of BlackRock since 2006; Managing Director of MLIM from 2005 to 2006; Director of MLIM from 1997 to 2005.
Michael A. Kalinoski, CFA	Director of BlackRock, Inc. since 2006; Director of MLIM from 1999 to 2006.
Christian Romaglino	Director of BlackRock since 2017, Portfolio Manager for the Municipal Mutual Fund Desk within BlackRock’s Global Fixed Income Group since 2017; Portfolio Manager of Brown Brothers Harriman from 2007 to 2017.

(a)(2) As of July 31, 2020:

	(ii) Number of Other Accounts Managed and Assets by Account Type			(iii) Number of Other Accounts and Assets for Which Advisory Fee is Performance-Based
(i) Name of Portfolio Manager	Other Registered Investment         Companies	Other Pooled   Investment     Vehicles	Other     Accounts	Other Registered Investment     Companies	Other Pooled   Investment Vehicles	Other     Accounts
Peter J. Hayes	4	0	1	0	0	0
	$14.18 Billion	$0	$9.58 Million	$0	$0	$0
Theodore R. Jaeckel, Jr., CFA	33	0	0	0	0	0
	$26.43 Billion	$0	$0	$0	$0	$0
Michael A. Kalinoski, CFA	16	0	0	0	0	0
	$33.01 Billion	$0	$0	$0	$0	$0
Christian Romaglino	12	0	0	0	0	0
	$4.61 Billion	$0	$0	$0	$0	$0

(iv) Portfolio Manager Potential Material Conflicts of Interest

BlackRock has built a professional working environment, firm-wide compliance culture and compliance procedures and systems designed to protect against potential incentives that may favor one account over another. BlackRock has adopted policies and procedures that address the allocation of investment opportunities, execution of portfolio transactions, personal trading by employees and other potential conflicts of interest that are designed to ensure that all client accounts are treated equitably over time. Nevertheless, BlackRock furnishes investment management and advisory services to numerous clients in addition to the Fund, and BlackRock may, consistent with applicable law, make investment recommendations to other clients or accounts (including accounts which are hedge funds or have performance or higher fees paid to BlackRock, or in which portfolio managers have a personal interest in the receipt of such fees), which may be the same as or different from those made to the Fund. In addition, BlackRock, Inc., its affiliates and significant shareholders and any officer, director, shareholder or employee may or may not have an interest in the securities

6

whose purchase and sale BlackRock recommends to the Fund. BlackRock, Inc., or any of its affiliates or significant shareholders, or any officer, director, shareholder, employee or any member of their families may take different actions than those recommended to the Fund by BlackRock with respect to the same securities. Moreover, BlackRock may refrain from rendering any advice or services concerning securities of companies of which any of BlackRock, Inc.’s (or its affiliates’ or significant shareholders’) officers, directors or employees are directors or officers, or companies as to which BlackRock, Inc. or any of its affiliates or significant shareholders or the officers, directors and employees of any of them has any substantial economic interest or possesses material non-public information. Certain portfolio managers also may manage accounts whose investment strategies may at times be opposed to the strategy utilized for a fund. It should also be noted that a portfolio manager may be managing hedge fund and/or long only accounts, or may be part of a team managing hedge fund and/or long only accounts, subject to incentive fees. Such portfolio managers may therefore be entitled to receive a portion of any incentive fees earned on such accounts. Currently, the portfolio managers of this Fund are not entitled to receive a portion of incentive fees of other accounts.

As a fiduciary, BlackRock owes a duty of loyalty to its clients and must treat each client fairly. When BlackRock purchases or sells securities for more than one account, the trades must be allocated in a manner consistent with its fiduciary duties. BlackRock attempts to allocate investments in a fair and equitable manner among client accounts, with no account receiving preferential treatment. To this end, BlackRock, Inc. has adopted policies that are intended to ensure reasonable efficiency in client transactions and provide BlackRock with sufficient flexibility to allocate investments in a manner that is consistent with the particular investment discipline and client base, as appropriate.

(a)(3) As of July 31, 2020:

Portfolio Manager Compensation Overview

The discussion below describes the portfolio managers’ compensation as of July 31, 2020.

BlackRock’s financial arrangements with its portfolio managers, its competitive compensation and its career path emphasis at all levels reflect the value senior management places on key resources. Compensation may include a variety of components and may vary from year to year based on a number of factors. The principal components of compensation include a base salary, a performance-based discretionary bonus, participation in various benefits programs and one or more of the incentive compensation programs established by BlackRock.

Base Compensation.  Generally, portfolio managers receive base compensation based on their position with the firm.

Discretionary Incentive Compensation.  Discretionary incentive compensation is a function of several components: the performance of BlackRock, Inc., the performance of the portfolio manager’s group within BlackRock, the investment performance, including risk-adjusted returns, of the firm’s assets under management or supervision by that portfolio manager relative to predetermined benchmarks, and the individual’s performance and contribution to the overall performance of these portfolios and BlackRock. In most cases, these benchmarks are the same as

7

the benchmark or benchmarks against which the performance of the Funds or other accounts managed by the portfolio managers are measured. Among other things, BlackRock’s Chief Investment Officers make a subjective determination with respect to each portfolio manager’s compensation based on the performance of the Funds and other accounts managed by each portfolio manager relative to the various benchmarks. Performance of fixed income funds is measured on a pre-tax and/or after-tax basis over various time periods including 1-, 3- and 5- year periods, as applicable. With respect to these portfolio managers, such benchmarks for the Fund and other accounts are:

Portfolio Managers	Applicable Benchmarks
Peter Hayes	A combination of market-based indices (e.g., Standard & Poor’s Municipal Bond Index), certain customized indices and certain fund industry peer groups. Due to Portfolio Manager Peter Hayes’ unique position (Portfolio Manager and Chief Investment Officer of Tax Exempt Fixed Income) his compensation does not solely reflect his role as PM of the funds managed by him. The performance of his fund(s) is included in consideration of his incentive compensation but given his unique role it is not the sole driver of compensation.
Theodore R. Jaeckel, Jr., CFA Michael Kalinoski, CFA Christian Romaglino	A combination of market-based indices (e.g., Standard & Poor’s Municipal Bond Index), certain customized indices and certain fund industry peer groups.

Distribution of Discretionary Incentive Compensation.  Discretionary incentive compensation is distributed to portfolio managers in a combination of cash, deferred BlackRock, Inc. stock awards, and/or deferred cash awards that notionally track the return of certain BlackRock investment products.

Portfolio managers receive their annual discretionary incentive compensation in the form of cash. Portfolio managers whose total compensation is above a specified threshold also receive deferred BlackRock, Inc. stock awards annually as part of their discretionary incentive compensation. Paying a portion of discretionary incentive compensation in the form of deferred BlackRock, Inc. stock puts compensation earned by a portfolio manager for a given year “at risk” based on BlackRock’s ability to sustain and improve its performance over future periods. In some cases, additional deferred BlackRock, Inc. stock may be granted to certain key employees as part of a long-term incentive award to aid in retention, align interests with long-term shareholders and motivate performance. Deferred BlackRock, Inc. stock awards are generally granted in the form of BlackRock, Inc. restricted stock units that vest pursuant to the terms of the applicable plan and, once vested, settle in BlackRock, Inc. common stock. The portfolio managers of this Fund have deferred BlackRock, Inc. stock awards.

For certain portfolio managers, a portion of the discretionary incentive compensation is also distributed in the form of deferred cash awards that notionally track the returns of select BlackRock

8

investment products they manage, which provides direct alignment of portfolio manager discretionary incentive compensation with investment product results. Deferred cash awards vest ratably over a number of years and, once vested, settle in the form of cash. Only portfolio managers who manage specified products and whose total compensation is above a specified threshold are eligible to participate in the deferred cash award program.

Other Compensation Benefits.  In addition to base salary and discretionary incentive compensation, portfolio managers may be eligible to receive or participate in one or more of the following:

Incentive Savings Plans — BlackRock, Inc. has created a variety of incentive savings plans in which BlackRock, Inc. employees are eligible to participate, including a 401(k) plan, the BlackRock Retirement Savings Plan (RSP), and the BlackRock Employee Stock Purchase Plan (ESPP). The employer contribution components of the RSP include a company match equal to 50% of the first 8% of eligible pay contributed to the plan capped at $5,000 per year, and a company retirement contribution equal to 3-5% of eligible compensation up to the Internal Revenue Service limit ($285,000 for 2020). The RSP offers a range of investment options, including registered investment companies and collective investment funds managed by the firm. BlackRock, Inc. contributions follow the investment direction set by participants for their own contributions or, absent participant investment direction, are invested into a target date fund that corresponds to, or is closest to, the year in which the participant attains age 65. The ESPP allows for investment in BlackRock, Inc. common stock at a 5% discount on the fair market value of the stock on the purchase date. Annual participation in the ESPP is limited to the purchase of 1,000 shares of common stock or a dollar value of $25,000 based on its fair market value on the purchase date. All of the eligible portfolio managers are eligible to participate in these plans.

(a)(4) Beneficial Ownership of Securities – As of July 31, 2020.

Portfolio Manager	Dollar Range of Equity Securities of the Fund Beneficially Owned
Peter J. Hayes	$50,001-$100,000
Theodore R. Jaeckel, Jr., CFA	$10,001 - $50,000
Michael A. Kalinoski, CFA	$10,001 - $50,000
Christian Romaglino	$10,001 - $50,000

(b) Not Applicable

Item 9    – Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers — Not Applicable due to no such purchases during the period covered by this report.

Item 10  – Submission of Matters to a Vote of Security Holders – There have been no material changes to these procedures.

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Item 11  – Controls and Procedures

(a) The registrant’s principal executive and principal financial officers, or persons performing similar functions, have concluded that the registrant’s disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the “1940 Act”)) are effective as of a date within 90 days of the filing of this report based on the evaluation of these controls and procedures required by Rule 30a-3(b) under the 1940 Act and Rule 13a-15(b) under the Securities Exchange Act of 1934, as amended.

(b) There were no changes in the registrant’s internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act) that occurred during the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant’s internal control over financial reporting.

Item 12  – Disclosure of Securities Lending Activities for Closed-End Management Investment Companies – Not Applicable

Item 13  – Exhibits attached hereto

(a)(2) – Section 302 Certifications are attached

(a)(3) – Not Applicable

(a)(4) – Not Applicable

(b) – Section 906 Certifications are attached

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Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

BlackRock Taxable Municipal Bond Trust

By:	/s/ John M. Perlowski
	John M. Perlowski
	Chief Executive Officer (principal executive officer) of
	BlackRock Taxable Municipal Bond Trust

Date: October 2, 2020

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By:	/s/ John M. Perlowski
	John M. Perlowski
	Chief Executive Officer (principal executive officer) of
	BlackRock Taxable Municipal Bond Trust

Date: October 2, 2020

By:	/s/ Neal J. Andrews
	Neal J. Andrews
	Chief Financial Officer (principal financial officer) of
	BlackRock Taxable Municipal Bond Trust

Date: October 2, 2020

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