485BPOS

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM N-1A

File No. 002-86606
File No. 811-03850

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	/X/
Pre-Effective Amendment No. _______	/   /
Post-Effective Amendment No.       55	/X/
	and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	/X/

       Amendment No.                                 55      

(Check appropriate box or boxes)

DELAWARE GROUP TAX-FREE FUND

(Exact Name of Registrant as Specified in Charter)

2005 Market Street, Philadelphia, Pennsylvania	19103-7094
(Address of Principal Executive Offices)	(Zip Code)
Registrant’s Telephone Number, including Area Code:	(800) 523-1918

David F. Connor, Esq., 2005 Market Street, Philadelphia, PA 19103-7094

(Name and Address of Agent for Service)

It is proposed that this filing will become effective (check appropriate box):

/X/	immediately upon filing pursuant to paragraph (b)
/   /	on (date) pursuant to paragraph (b)
/   /	60 days after filing pursuant to paragraph (a)(1)
/   /	on (date) pursuant to paragraph (a)(1)
/   /	75 days after filing pursuant to paragraph (a)(2)
/   /	on (date) pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

       /    /       this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this Registration Statement under Rule 485(b) under the Securities Act of 1933 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Philadelphia and Commonwealth of Pennsylvania on this 18th day of January, 2018.

DELAWARE GROUP TAX-FREE FUND
By:	/s/ Shawn K. Lytle
	Shawn K. Lytle
	President/Chief Executive Officer

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated:

Signature		Title	Date
/s/ Shawn K. Lytle		President/Chief Executive Officer	January 18, 2018
Shawn K. Lytle		(Principal Executive Officer) and Trustee
Thomas L. Bennett	*	Chairman and Trustee	January 18, 2018
Thomas L. Bennett
Ann D. Borowiec	*	Trustee	January 18, 2018
Ann D. Borowiec
Joseph W. Chow	*	Trustee	January 18, 2018
Joseph W. Chow
John A. Fry	*	Trustee	January 18, 2018
John A. Fry
Lucinda S. Landreth	*	Trustee	January 18, 2018
Lucinda S. Landreth
Frances A. Sevilla-Sacasa	*	Trustee	January 18, 2018
Frances A. Sevilla-Sacasa
Thomas K. Whitford	*	Trustee	January 18, 2018
Thomas K. Whitford
Janet L. Yeomans	*	Trustee	January 18, 2018
Janet L. Yeomans
Richard Salus	*	Senior Vice President/Chief Financial Officer	January 18, 2018
Richard Salus		(Principal Financial Officer)

*By: /s/ Shawn K. Lytle
Shawn K. Lytle
as Attorney-in-Fact for each of the persons indicated
(Pursuant to Powers of Attorney previously filed)

INDEX TO EXHIBITS
(Delaware Group^® Tax-Free Fund N-1A)

Exhibit No.	Exhibit
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

Document and Entity Information	Total
Document and Entity Information:
Registrant Name	Delaware Group Tax Free Fund
Document Type	485BPOS
Document Period End Date	Aug. 31, 2017
Amendment Flag	false
Central Index Key	0000728352
Document Effective Date	Dec. 29, 2017
Document Creation Date	Dec. 28, 2017
Delaware Tax-Free USA Fund | Class A
Document and Entity Information:
Trading Symbol	DMTFX
Delaware Tax-Free USA Fund | Class C
Document and Entity Information:
Trading Symbol	DUSCX
Delaware Tax-Free USA Fund | Institutional Class
Document and Entity Information:
Trading Symbol	DTFIX
Delaware Tax-Free USA Intermediate Fund | Class A
Document and Entity Information:
Trading Symbol	DMUSX
Delaware Tax-Free USA Intermediate Fund | Class C
Document and Entity Information:
Trading Symbol	DUICX
Delaware Tax-Free USA Intermediate Fund | Institutional Class
Document and Entity Information:
Trading Symbol	DUSIX

XML

Delaware Tax-Free USA Fund

Delaware Tax-Free USA Fund

What is the Fund’s investment objective?

Delaware Tax-Free USA Fund seeks as high a level of current interest income exempt from federal income tax as is available from municipal obligations and as is consistent with prudent investment management and preservation of capital.

What are the Fund’s fees and expenses?

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds^SM by Macquarie. More information about these and other discounts is available from your financial intermediary, in the Fund’s Prospectus under the section entitled “About your account,” and in the Fund’s statement of additional information (SAI) under the section entitled “Purchasing Shares.”

Shareholder fees (fees paid directly from your investment)

Shareholder Fees - Delaware Tax-Free USA Fund	Class A	Class C		Institutional Class
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%	none		none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none	1.00%	[1]	none

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - Delaware Tax-Free USA Fund		Class A	Class C	Institutional Class
Management fees		0.55%	0.55%	0.55%
Distribution and service (12b-1) fees		0.25%	1.00%	none
Other expenses		0.16%	0.16%	0.16%
Total annual fund operating expenses		0.96%	1.71%	0.71%
Fee waivers and expense reimbursements	[1]	(0.15%)	(0.15%)	(0.15%)
Total annual fund operating expenses after fee waivers and expense reimbursements		0.81%	1.56%	0.56%

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. In addition, the example shows expenses for Class C shares, assuming those shares were not redeemed at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager’s expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example - Delaware Tax-Free USA Fund - USD ($)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	529	728	943	1,562
Class C	259	524	914	2,007
Institutional Class	57	212	380	868

Expense Example, No Redemption	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
Delaware Tax-Free USA Fund | Class C | USD ($)	159	524	914	2,007

Portfolio turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 33% of the average value of its portfolio.

What are the Fund’s principal investment strategies?

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities the income from which is exempt from federal income tax, including the federal alternative minimum tax. This is a fundamental investment policy that may not be changed without prior shareholder approval.

The Fund will invest primarily in municipal debt obligations that are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions, but will have a dollar-weighted average effective maturity of between 5 and 30 years. The Manager will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund’s income level will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit its investment needs. The types of municipal debt obligations in which the Fund may invest include, but are not limited to, advance refunded bonds, revenue bonds, general obligation bonds, insured municipal bonds, private activity bonds, municipal leases, and certificates of participation.

What are the principal risks of investing in the Fund?

Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. The Fund’s principal risks include:

Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.

Interest rate risk — The risk that the prices of bonds and other fixed income securities will increase as interest rates fall and decrease as interest rates rise. Interest rate changes are influenced by a number of factors, such as government policy, monetary policy, inflation expectations, and the supply and demand of bonds. Bonds and other fixed income securities with longer maturities or duration generally are more sensitive to interest rate changes. A fund may be subject to a greater risk of rising interest rates due to the current period of historically low interest rates.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer or an entity that insures a bond, may be unable to make interest payments and/or repay principal in a timely manner.

High yield (junk bond) risk — The risk that high yield securities, commonly known as “junk bonds,” are subject to reduced creditworthiness of issuers, increased risk of default, and a more limited and less liquid secondary market. High yield securities may also be subject to greater price volatility and risk of loss of income and principal than are higher-rated securities. High yield bonds are sometimes issued by municipalities that have less financial strength and therefore have less ability to make projected debt payments on the bonds.

Call risk — The risk that a bond issuer will prepay the bond during periods of low interest rates, forcing a fund to reinvest that money at interest rates that might be lower than rates on the called bond.

Liquidity risk — The possibility that securities cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Alternative minimum tax risk — If a fund invests in bonds whose income is subject to the alternative minimum tax, that portion of the fund’s distributions would be taxable for shareholders who are subject to this tax.

Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance. For example, a tax-exempt security may be reclassified by the Internal Revenue Service or a state tax authority as taxable, and/or future legislative, administrative, or court actions could cause interest from a tax-exempt security to become taxable, possibly retroactively.

Geographic concentration risk — The risk that heightened sensitivity to regional, state, US territories or possessions (such as the Commonwealth of Puerto Rico, Guam, or the US Virgin Islands), and local political and economic conditions could adversely affect the holdings in and performance of a fund. From time to time, the fund may have a significant position in the municipal securities of a particular state, US territory, or US possession. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state or US territory or possession.

Active management and selection risk — The risk that the securities selected by Fund management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.

The Manager is an indirect wholly owned subsidiary of Macquarie Group Limited (MGL). Other than Macquarie Bank Limited (MBL), a subsidiary of MGL and an affiliate of the Manager, none of the entities noted are authorized deposit-taking institutions for the purposes of the Banking Act 1959 (Commonwealth of Australia). The obligations of these entities do not represent deposits or other liabilities of MBL. MBL does not guarantee or otherwise provide assurance in respect of the obligations of these entities, unless noted otherwise. The Fund is governed by US laws and regulations.

How has Delaware Tax-Free USA Fund performed?

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns for the 1-, 5-, and 10-year or lifetime periods compare with those of a broad measure of market performance. The Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps.  You may obtain the Fund’s most recently available month-end performance by calling 800 523-1918 or by visiting our website at delawarefunds.com/performance.

Calendar year-by-year total return (Class A)

As of Sept. 30, 2017, the Fund’s Class A shares had a calendar year-to-date return of 4.95%. During the periods illustrated in this bar chart, Class A’s highest quarterly return was 9.63% for the quarter ended Sept. 30, 2009, and its lowest quarterly return was -4.71% for the quarter ended Dec. 31, 2010. The maximum Class A sales charge of 4.50%, which is normally deducted when you purchase shares, is not reflected in the highest/lowest quarterly returns or in the bar chart. If this fee were included, the returns would be less than those shown. The average annual total returns in the table below do include the sales charge.

Average annual total returns for periods ended December 31, 2016

Average Annual Total Returns - Delaware Tax-Free USA Fund	Label	1 Year	5 Years	10 years or lifetime	Lifetime
Bloomberg Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)		0.25%	3.28%	4.25%
Class A		(4.58%)	2.85%	3.63%
Class A | After Taxes on Distributions		(4.83%)	2.78%	3.59%
Class A | After Taxes on Distributions and Sales		(0.95%)	3.08%	3.71%
Class C		(1.81%)	3.01%	3.33%
Institutional Class	(lifetime: 12/31/08–12/31/16)	0.08%	4.04%		6.36%

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary. Actual after-tax returns depend on the investor’s individual tax situation and may differ from the returns shown. After-tax returns are not relevant for shares held in tax-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

Delaware Tax-Free USA Intermediate Fund

Delaware Tax-Free USA Intermediate Fund

What is the Fund’s investment objective?

Delaware Tax-Free USA Intermediate Fund seeks as high a level of current interest income exempt from federal income tax as is available from municipal obligations and as is consistent with prudent investment management and preservation of capital.

What are the Fund’s fees and expenses?

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds^SM by Macquarie. More information about these and other discounts is available from your financial intermediary, in the Fund’s Prospectus under the section entitled “About your account,” and in the Fund’s statement of additional information (SAI) under the section entitled “Purchasing Shares.”

Shareholder fees (fees paid directly from your investment)

Shareholder Fees - Delaware Tax-Free USA Intermediate Fund	Class A	Class C		Institutional Class
Maximum sales charge (load) imposed on purchases as a percentage of offering price	2.75%	none		none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none	1.00%	[1]	none

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - Delaware Tax-Free USA Intermediate Fund		Class A	Class C	Institutional Class
Management fees		0.50%	0.50%	0.50%
Distribution and service (12b-1) fees		0.25%	1.00%	none
Other expenses		0.18%	0.18%	0.18%
Total annual fund operating expenses		0.93%	1.68%	0.68%
Fee waivers and expense reimbursements	[1]	(0.18%)	(0.08%)	(0.08%)
Total annual fund operating expenses after fee waivers and expense reimbursements		0.75%	1.60%	0.60%

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. In addition, the example shows expenses for Class C shares, assuming those shares were not redeemed at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the applicable waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example - Delaware Tax-Free USA Intermediate Fund - USD ($)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	349	546	758	1,371
Class C	263	522	905	1,980
Institutional Class	61	210	371	839

Expense Example, No Redemption	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
Delaware Tax-Free USA Intermediate Fund | Class C | USD ($)	163	522	905	1,980

Portfolio turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 26% of the average value of its portfolio.

What are the Fund’s principal investment strategies?

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities the income from which is exempt from federal income tax, including the federal alternative minimum tax. This is a fundamental investment policy that may not be changed without prior shareholder approval.

The Fund will invest primarily in municipal debt obligations that are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions, but will have a dollar-weighted average effective maturity of between 3 and 10 years. The Manager will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund’s income level will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit its investment needs. The types of municipal debt obligations in which the Fund may invest include, but are not limited to, advance refunded bonds, revenue bonds, general obligation bonds, insured municipal bonds, private activity bonds, municipal leases, and certificates of participation.

What are the principal risks of investing in the Fund?

Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. The Fund’s principal risks include:

Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.

Interest rate risk — The risk that the prices of bonds and other fixed income securities will increase as interest rates fall and decrease as interest rates rise. Interest rate changes are influenced by a number of factors, such as government policy, monetary policy, inflation expectations, and the supply and demand of bonds. Bonds and other fixed income securities with longer maturities or duration generally are more sensitive to interest rate changes. A fund may be subject to a greater risk of rising interest rates due to the current period of historically low interest rates.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer or an entity that insures a bond, may be unable to make interest payments and/or repay principal in a timely manner.

Call risk — The risk that a bond issuer will prepay the bond during periods of low interest rates, forcing a fund to reinvest that money at interest rates that might be lower than rates on the called bond.

Liquidity risk — The possibility that securities cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Alternative minimum tax risk — If a fund invests in bonds whose income is subject to the alternative minimum tax, that portion of the fund’s distributions would be taxable for shareholders who are subject to this tax.

Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance. For example, a tax-exempt security may be reclassified by the Internal Revenue Service or a state tax authority as taxable, and/or future legislative, administrative, or court actions could cause interest from a tax-exempt security to become taxable, possibly retroactively.

Geographic concentration risk — The risk that heightened sensitivity to regional, state, US territories or possessions (such as the Commonwealth of Puerto Rico, Guam, or the US Virgin Islands), and local political and economic conditions could adversely affect the holdings in and performance of a fund. From time to time, the fund may have a significant position in the municipal securities of a particular state, US territory, or US possession. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state or US territory or possession.

Active management and selection risk — The risk that the securities selected by Fund management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.

The Manager is an indirect wholly owned subsidiary of Macquarie Group Limited (MGL). Other than Macquarie Bank Limited (MBL), a subsidiary of MGL and an affiliate of the Manager, none of the entities noted are authorized deposit-taking institutions for the purposes of the Banking Act 1959 (Commonwealth of Australia). The obligations of these entities do not represent deposits or other liabilities of MBL. MBL does not guarantee or otherwise provide assurance in respect of the obligations of these entities, unless noted otherwise. The Fund is governed by US laws and regulations.

How has Delaware Tax-Free USA Intermediate Fund performed?

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns for the 1-, 5-, and 10-year or lifetime  periods compare with those of a broad measure of market performance. The Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps.  You may obtain the Fund’s most recently available month-end performance by calling 800 523-1918 or by visiting our website at delawarefunds.com/performance.

Calendar year-by-year total return (Class A)

As of Sept. 30, 2017, the Fund’s Class A shares had a calendar year-to-date return of 4.63%. During the periods illustrated in this bar chart, Class A’s highest quarterly return was 6.88% for the quarter ended Sept. 30, 2009, and its lowest quarterly return was -4.05% for the quarter ended Dec. 31, 2010. The maximum Class A sales charge of 2.75%, which is normally deducted when you purchase shares, is not reflected in the highest/lowest quarterly returns or in the bar chart. If this fee were included, the returns would be less than those shown. The average annual total returns in the table below do include the sales charge.

Average annual total returns for periods ended December 31, 2016

Average Annual Total Returns - Delaware Tax-Free USA Intermediate Fund	Label	1 Year	5 Years	10 years or lifetime	Lifetime
Bloomberg Barclays 3-15 Year Blend Municipal Bond Index* (reflects no deduction for fees, expenses, or taxes)		(0.05%)	2.73%	4.23%
Class A		(3.42%)	1.71%	3.09%
Class A | After Taxes on Distributions		(3.43%)	1.71%	3.09%
Class A | After Taxes on Distributions and Sales		(0.75%)	1.98%	3.12%
Class C		(2.61%)	1.41%	2.50%
Institutional Class	(lifetime: 12/31/08–12/31/16)	(0.62%)	2.43%		4.43%

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary. Actual after-tax returns depend on the investor’s individual tax situation and may differ from the returns shown. After-tax returns are not relevant for shares held in tax-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

[1] Class C shares redeemed within one year of purchase are subject to a 1.00% contingent deferred sales charge (CDSC).

[1] The Fund’s investment manager, Delaware Management Company (Manager), has contractually agreed to waive all or a portion of its investment advisory fees and/or pay/reimburse expenses (excluding any 12b-1 fees, acquired fund fees and expenses, taxes, interest, inverse floater program expenses, short sale dividend and interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) in order to prevent total annual fund operating expenses from exceeding 0.56% of the Fund’s average daily net assets from Dec. 29, 2017 through Dec. 29, 2018. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund. The Fund’s Class A shares also are subject to a blended 12b-1 fee of 0.10% on all shares acquired prior to June 1, 1992 and 0.25% on all shares acquired on or after June 1, 1992.

[1] Class C shares redeemed within one year of purchase are subject to a 1.00% contingent deferred sales charge (CDSC).

[1] The Fund’s investment manager, Delaware Management Company (Manager), has contractually agreed to waive all or a portion of its investment advisory fees and/or pay/reimburse expenses (excluding any 12b-1 fees, acquired fund fees and expenses, taxes, interest, inverse floater program expenses, short sale dividend and interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) in order to prevent total annual fund operating expenses from exceeding 0.60% of the Fund’s average daily net assets from Dec. 29, 2017 through Dec. 29, 2018. In addition, the Fund’s distributor, Delaware Distributors, L.P. (Distributor), has contracted to limit the Class A shares’ 12b-1 fees to no more than 0.15% of average daily net assets from Dec. 29, 2017 through Dec. 29, 2018. These waivers and reimbursements may only be terminated by agreement of the Manager or Distributor, as applicable, and the Fund.

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Risk/Return:

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Document Type

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485BPOS

Document Period End Date

dei_DocumentPeriodEndDate

Aug. 31, 2017

Registrant Name

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Delaware Group Tax Free Fund

Central Index Key

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0000728352

Amendment Flag

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false

Document Creation Date

dei_DocumentCreationDate

Dec. 28, 2017

Document Effective Date

dei_DocumentEffectiveDate

Dec. 29, 2017

Prospectus Date

rr_ProspectusDate

Dec. 29, 2017

Delaware Tax-Free USA Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return

rr_RiskReturnHeading

Delaware Tax-Free USA Fund

Objective

rr_ObjectiveHeading

What is the Fund’s investment objective?

Objective, Primary

rr_ObjectivePrimaryTextBlock

Delaware Tax-Free USA Fund seeks as high a level of current interest income exempt from federal income tax as is available from municipal obligations and as is consistent with prudent investment management and preservation of capital.

Expense

rr_ExpenseHeading

What are the Fund’s fees and expenses?

Expense Narrative

rr_ExpenseNarrativeTextBlock

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds^SM by Macquarie. More information about these and other discounts is available from your financial intermediary, in the Fund’s Prospectus under the section entitled “About your account,” and in the Fund’s statement of additional information (SAI) under the section entitled “Purchasing Shares.”

Shareholder Fees Caption

rr_ShareholderFeesCaption

Shareholder fees (fees paid directly from your investment)

Operating Expenses Caption

rr_OperatingExpensesCaption

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover Heading

rr_PortfolioTurnoverHeading

Portfolio turnover

Portfolio Turnover

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 33% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

33.00%

Expense Breakpoint Discounts

rr_ExpenseBreakpointDiscounts

You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware FundsSM by Macquarie.

Expense Breakpoint, Minimum Investment Required

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 100,000

Expense Example

rr_ExpenseExampleHeading

Example

Expense Example Narrative

rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. In addition, the example shows expenses for Class C shares, assuming those shares were not redeemed at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager’s expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy

rr_StrategyHeading

What are the Fund’s principal investment strategies?

Strategy Narrative

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities the income from which is exempt from federal income tax, including the federal alternative minimum tax. This is a fundamental investment policy that may not be changed without prior shareholder approval.

The Fund will invest primarily in municipal debt obligations that are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions, but will have a dollar-weighted average effective maturity of between 5 and 30 years. The Manager will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund’s income level will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit its investment needs. The types of municipal debt obligations in which the Fund may invest include, but are not limited to, advance refunded bonds, revenue bonds, general obligation bonds, insured municipal bonds, private activity bonds, municipal leases, and certificates of participation.

Strategy Portfolio Concentration

rr_StrategyPortfolioConcentration

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities the income from which is exempt from federal income tax, including the federal alternative minimum tax.

Risk

rr_RiskHeading

What are the principal risks of investing in the Fund?

Risk Narrative

rr_RiskNarrativeTextBlock

Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. The Fund’s principal risks include:

Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.

Interest rate risk — The risk that the prices of bonds and other fixed income securities will increase as interest rates fall and decrease as interest rates rise. Interest rate changes are influenced by a number of factors, such as government policy, monetary policy, inflation expectations, and the supply and demand of bonds. Bonds and other fixed income securities with longer maturities or duration generally are more sensitive to interest rate changes. A fund may be subject to a greater risk of rising interest rates due to the current period of historically low interest rates.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer or an entity that insures a bond, may be unable to make interest payments and/or repay principal in a timely manner.

High yield (junk bond) risk — The risk that high yield securities, commonly known as “junk bonds,” are subject to reduced creditworthiness of issuers, increased risk of default, and a more limited and less liquid secondary market. High yield securities may also be subject to greater price volatility and risk of loss of income and principal than are higher-rated securities. High yield bonds are sometimes issued by municipalities that have less financial strength and therefore have less ability to make projected debt payments on the bonds.

Call risk — The risk that a bond issuer will prepay the bond during periods of low interest rates, forcing a fund to reinvest that money at interest rates that might be lower than rates on the called bond.

Liquidity risk — The possibility that securities cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Alternative minimum tax risk — If a fund invests in bonds whose income is subject to the alternative minimum tax, that portion of the fund’s distributions would be taxable for shareholders who are subject to this tax.

Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance. For example, a tax-exempt security may be reclassified by the Internal Revenue Service or a state tax authority as taxable, and/or future legislative, administrative, or court actions could cause interest from a tax-exempt security to become taxable, possibly retroactively.

Geographic concentration risk — The risk that heightened sensitivity to regional, state, US territories or possessions (such as the Commonwealth of Puerto Rico, Guam, or the US Virgin Islands), and local political and economic conditions could adversely affect the holdings in and performance of a fund. From time to time, the fund may have a significant position in the municipal securities of a particular state, US territory, or US possession. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state or US territory or possession.

Active management and selection risk — The risk that the securities selected by Fund management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.

The Manager is an indirect wholly owned subsidiary of Macquarie Group Limited (MGL). Other than Macquarie Bank Limited (MBL), a subsidiary of MGL and an affiliate of the Manager, none of the entities noted are authorized deposit-taking institutions for the purposes of the Banking Act 1959 (Commonwealth of Australia). The obligations of these entities do not represent deposits or other liabilities of MBL. MBL does not guarantee or otherwise provide assurance in respect of the obligations of these entities, unless noted otherwise. The Fund is governed by US laws and regulations.

Risk Lose Money

rr_RiskLoseMoney

Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio.

Bar Chart and Performance Table

rr_BarChartAndPerformanceTableHeading

How has Delaware Tax-Free USA Fund performed?

Performance Narrative

rr_PerformanceNarrativeTextBlock

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns for the 1-, 5-, and 10-year or lifetime periods compare with those of a broad measure of market performance. The Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps.  You may obtain the Fund’s most recently available month-end performance by calling 800 523-1918 or by visiting our website at delawarefunds.com/performance.

Performance Availability Phone

rr_PerformanceAvailabilityPhone

800 523-1918

Performance Availability Website Address

rr_PerformanceAvailabilityWebSiteAddress

delawarefunds.com/performance

Performance Past Does Not Indicate Future

rr_PerformancePastDoesNotIndicateFuture

The Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future.

Bar Chart Heading

rr_BarChartHeading

Calendar year-by-year total return (Class A)

Bar Chart Closing

rr_BarChartClosingTextBlock

As of Sept. 30, 2017, the Fund’s Class A shares had a calendar year-to-date return of 4.95%. During the periods illustrated in this bar chart, Class A’s highest quarterly return was 9.63% for the quarter ended Sept. 30, 2009, and its lowest quarterly return was -4.71% for the quarter ended Dec. 31, 2010. The maximum Class A sales charge of 4.50%, which is normally deducted when you purchase shares, is not reflected in the highest/lowest quarterly returns or in the bar chart. If this fee were included, the returns would be less than those shown. The average annual total returns in the table below do include the sales charge.

Performance Table Heading

rr_PerformanceTableHeading

Average annual total returns for periods ended December 31, 2016

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns are not relevant for shares held in tax-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).

Performance Table One Class of after Tax Shown

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax performance is presented only for Class A shares of the Fund.

Performance Table Closing

rr_PerformanceTableClosingTextBlock

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary. Actual after-tax returns depend on the investor’s individual tax situation and may differ from the returns shown. After-tax returns are not relevant for shares held in tax-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

Delaware Tax-Free USA Fund | Bloomberg Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Index No Deduction for Fees, Expenses, Taxes

rr_IndexNoDeductionForFeesExpensesTaxes

Reflects no deduction for fees, expenses, or taxes.

1 Year

rr_AverageAnnualReturnYear01

0.25%

5 Years

rr_AverageAnnualReturnYear05

3.28%

10 years or lifetime

rr_AverageAnnualReturnYear10

4.25%

Delaware Tax-Free USA Fund | Class A

Risk/Return:

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

DMTFX

Maximum sales charge (load) imposed on purchases as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

4.50%

Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.16%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.96%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.15%)

^[1]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

0.81%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 529

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

728

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

943

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,562

Annual Return 2007

rr_AnnualReturn2007

0.67%

Annual Return 2008

rr_AnnualReturn2008

(6.81%)

Annual Return 2009

rr_AnnualReturn2009

16.14%

Annual Return 2010

rr_AnnualReturn2010

2.98%

Annual Return 2011

rr_AnnualReturn2011

10.61%

Annual Return 2012

rr_AnnualReturn2012

10.96%

Annual Return 2013

rr_AnnualReturn2013

(5.16%)

Annual Return 2014

rr_AnnualReturn2014

10.87%

Annual Return 2015

rr_AnnualReturn2015

3.44%

Annual Return 2016

rr_AnnualReturn2016

(0.10%)

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

4.95%

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

9.63%

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2010

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(4.71%)

1 Year

rr_AverageAnnualReturnYear01

(4.58%)

5 Years

rr_AverageAnnualReturnYear05

2.85%

10 years or lifetime

rr_AverageAnnualReturnYear10

3.63%

Delaware Tax-Free USA Fund | Class A | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(4.83%)

5 Years

rr_AverageAnnualReturnYear05

2.78%

10 years or lifetime

rr_AverageAnnualReturnYear10

3.59%

Delaware Tax-Free USA Fund | Class A | After Taxes on Distributions and Sales

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(0.95%)

5 Years

rr_AverageAnnualReturnYear05

3.08%

10 years or lifetime

rr_AverageAnnualReturnYear10

3.71%

Delaware Tax-Free USA Fund | Class C

Risk/Return:

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

DUSCX

Maximum sales charge (load) imposed on purchases as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

^[2]

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.16%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.71%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.15%)

^[1]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

1.56%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 259

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

524

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

914

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,007

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

159

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

524

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

914

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,007

1 Year

rr_AverageAnnualReturnYear01

(1.81%)

5 Years

rr_AverageAnnualReturnYear05

3.01%

10 years or lifetime

rr_AverageAnnualReturnYear10

3.33%

Delaware Tax-Free USA Fund | Institutional Class

Risk/Return:

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

DTFIX

Maximum sales charge (load) imposed on purchases as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.16%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.71%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.15%)

^[1]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

0.56%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 57

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

212

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

380

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 868

Label

rr_AverageAnnualReturnLabel

(lifetime: 12/31/08–12/31/16)

1 Year

rr_AverageAnnualReturnYear01

0.08%

5 Years

rr_AverageAnnualReturnYear05

4.04%

Lifetime

rr_AverageAnnualReturnSinceInception

6.36%

Delaware Tax-Free USA Intermediate Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return

rr_RiskReturnHeading

Delaware Tax-Free USA Intermediate Fund

Objective

rr_ObjectiveHeading

What is the Fund’s investment objective?

Objective, Primary

rr_ObjectivePrimaryTextBlock

Delaware Tax-Free USA Intermediate Fund seeks as high a level of current interest income exempt from federal income tax as is available from municipal obligations and as is consistent with prudent investment management and preservation of capital.

Expense

rr_ExpenseHeading

What are the Fund’s fees and expenses?

Expense Narrative

rr_ExpenseNarrativeTextBlock

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds^SM by Macquarie. More information about these and other discounts is available from your financial intermediary, in the Fund’s Prospectus under the section entitled “About your account,” and in the Fund’s statement of additional information (SAI) under the section entitled “Purchasing Shares.”

Shareholder Fees Caption

rr_ShareholderFeesCaption

Shareholder fees (fees paid directly from your investment)

Operating Expenses Caption

rr_OperatingExpensesCaption

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover Heading

rr_PortfolioTurnoverHeading

Portfolio turnover

Portfolio Turnover

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 26% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

26.00%

Expense Breakpoint Discounts

rr_ExpenseBreakpointDiscounts

You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware FundsSM by Macquarie.

Expense Breakpoint, Minimum Investment Required

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 100,000

Expense Example

rr_ExpenseExampleHeading

Example

Expense Example Narrative

rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. In addition, the example shows expenses for Class C shares, assuming those shares were not redeemed at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the applicable waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy

rr_StrategyHeading

What are the Fund’s principal investment strategies?

Strategy Narrative

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities the income from which is exempt from federal income tax, including the federal alternative minimum tax. This is a fundamental investment policy that may not be changed without prior shareholder approval.

The Fund will invest primarily in municipal debt obligations that are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions, but will have a dollar-weighted average effective maturity of between 3 and 10 years. The Manager will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund’s income level will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit its investment needs. The types of municipal debt obligations in which the Fund may invest include, but are not limited to, advance refunded bonds, revenue bonds, general obligation bonds, insured municipal bonds, private activity bonds, municipal leases, and certificates of participation.

Strategy Portfolio Concentration

rr_StrategyPortfolioConcentration

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities the income from which is exempt from federal income tax, including the federal alternative minimum tax.

Risk

rr_RiskHeading

What are the principal risks of investing in the Fund?

Risk Narrative

rr_RiskNarrativeTextBlock

Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. The Fund’s principal risks include:

Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.

Interest rate risk — The risk that the prices of bonds and other fixed income securities will increase as interest rates fall and decrease as interest rates rise. Interest rate changes are influenced by a number of factors, such as government policy, monetary policy, inflation expectations, and the supply and demand of bonds. Bonds and other fixed income securities with longer maturities or duration generally are more sensitive to interest rate changes. A fund may be subject to a greater risk of rising interest rates due to the current period of historically low interest rates.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer or an entity that insures a bond, may be unable to make interest payments and/or repay principal in a timely manner.

Call risk — The risk that a bond issuer will prepay the bond during periods of low interest rates, forcing a fund to reinvest that money at interest rates that might be lower than rates on the called bond.

Liquidity risk — The possibility that securities cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Alternative minimum tax risk — If a fund invests in bonds whose income is subject to the alternative minimum tax, that portion of the fund’s distributions would be taxable for shareholders who are subject to this tax.

Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance. For example, a tax-exempt security may be reclassified by the Internal Revenue Service or a state tax authority as taxable, and/or future legislative, administrative, or court actions could cause interest from a tax-exempt security to become taxable, possibly retroactively.

Geographic concentration risk — The risk that heightened sensitivity to regional, state, US territories or possessions (such as the Commonwealth of Puerto Rico, Guam, or the US Virgin Islands), and local political and economic conditions could adversely affect the holdings in and performance of a fund. From time to time, the fund may have a significant position in the municipal securities of a particular state, US territory, or US possession. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state or US territory or possession.

Active management and selection risk — The risk that the securities selected by Fund management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.

The Manager is an indirect wholly owned subsidiary of Macquarie Group Limited (MGL). Other than Macquarie Bank Limited (MBL), a subsidiary of MGL and an affiliate of the Manager, none of the entities noted are authorized deposit-taking institutions for the purposes of the Banking Act 1959 (Commonwealth of Australia). The obligations of these entities do not represent deposits or other liabilities of MBL. MBL does not guarantee or otherwise provide assurance in respect of the obligations of these entities, unless noted otherwise. The Fund is governed by US laws and regulations.

Risk Lose Money

rr_RiskLoseMoney

Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio.

Bar Chart and Performance Table

rr_BarChartAndPerformanceTableHeading

How has Delaware Tax-Free USA Intermediate Fund performed?

Performance Narrative

rr_PerformanceNarrativeTextBlock

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns for the 1-, 5-, and 10-year or lifetime  periods compare with those of a broad measure of market performance. The Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps.  You may obtain the Fund’s most recently available month-end performance by calling 800 523-1918 or by visiting our website at delawarefunds.com/performance.

Performance Availability Phone

rr_PerformanceAvailabilityPhone

800 523-1918

Performance Availability Website Address

rr_PerformanceAvailabilityWebSiteAddress

delawarefunds.com/performance

Performance Past Does Not Indicate Future

rr_PerformancePastDoesNotIndicateFuture

The Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future.

Bar Chart Heading

rr_BarChartHeading

Calendar year-by-year total return (Class A)

Bar Chart Closing

rr_BarChartClosingTextBlock

As of Sept. 30, 2017, the Fund’s Class A shares had a calendar year-to-date return of 4.63%. During the periods illustrated in this bar chart, Class A’s highest quarterly return was 6.88% for the quarter ended Sept. 30, 2009, and its lowest quarterly return was -4.05% for the quarter ended Dec. 31, 2010. The maximum Class A sales charge of 2.75%, which is normally deducted when you purchase shares, is not reflected in the highest/lowest quarterly returns or in the bar chart. If this fee were included, the returns would be less than those shown. The average annual total returns in the table below do include the sales charge.

Performance Table Heading

rr_PerformanceTableHeading

Average annual total returns for periods ended December 31, 2016

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns are not relevant for shares held in tax-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).

Performance Table One Class of after Tax Shown

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax performance is presented only for Class A shares of the Fund.

Performance Table Closing

rr_PerformanceTableClosingTextBlock

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary. Actual after-tax returns depend on the investor’s individual tax situation and may differ from the returns shown. After-tax returns are not relevant for shares held in tax-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

Delaware Tax-Free USA Intermediate Fund | Bloomberg Barclays 3-15 Year Blend Municipal Bond Index* (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Index No Deduction for Fees, Expenses, Taxes

rr_IndexNoDeductionForFeesExpensesTaxes

Reflects no deduction for fees, expenses, or taxes.

1 Year

rr_AverageAnnualReturnYear01

(0.05%)

5 Years

rr_AverageAnnualReturnYear05

2.73%

10 years or lifetime

rr_AverageAnnualReturnYear10

4.23%

Delaware Tax-Free USA Intermediate Fund | Class A

Risk/Return:

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

DMUSX

Maximum sales charge (load) imposed on purchases as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

2.75%

Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Management fees

rr_ManagementFeesOverAssets

0.50%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.18%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.93%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.18%)

^[3]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

0.75%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 349

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

546

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

758

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,371

Annual Return 2007

rr_AnnualReturn2007

1.74%

Annual Return 2008

rr_AnnualReturn2008

(1.02%)

Annual Return 2009

rr_AnnualReturn2009

11.38%

Annual Return 2010

rr_AnnualReturn2010

2.24%

Annual Return 2011

rr_AnnualReturn2011

8.75%

Annual Return 2012

rr_AnnualReturn2012

5.76%

Annual Return 2013

rr_AnnualReturn2013

(2.60%)

Annual Return 2014

rr_AnnualReturn2014

6.86%

Annual Return 2015

rr_AnnualReturn2015

2.39%

Annual Return 2016

rr_AnnualReturn2016

(0.72%)

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

4.63%

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

6.88%

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2010

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(4.05%)

1 Year

rr_AverageAnnualReturnYear01

(3.42%)

5 Years

rr_AverageAnnualReturnYear05

1.71%

10 years or lifetime

rr_AverageAnnualReturnYear10

3.09%

Delaware Tax-Free USA Intermediate Fund | Class A | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(3.43%)

5 Years

rr_AverageAnnualReturnYear05

1.71%

10 years or lifetime

rr_AverageAnnualReturnYear10

3.09%

Delaware Tax-Free USA Intermediate Fund | Class A | After Taxes on Distributions and Sales

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(0.75%)

5 Years

rr_AverageAnnualReturnYear05

1.98%

10 years or lifetime

rr_AverageAnnualReturnYear10

3.12%

Delaware Tax-Free USA Intermediate Fund | Class C

Risk/Return:

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

DUICX

Maximum sales charge (load) imposed on purchases as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

^[2]

Management fees

rr_ManagementFeesOverAssets

0.50%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.18%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.68%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[3]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

1.60%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 263

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

522

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

905

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,980

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

163

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

522

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

905

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,980

1 Year

rr_AverageAnnualReturnYear01

(2.61%)

5 Years

rr_AverageAnnualReturnYear05

1.41%

10 years or lifetime

rr_AverageAnnualReturnYear10

2.50%

Delaware Tax-Free USA Intermediate Fund | Institutional Class

Risk/Return:

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

DUSIX

Maximum sales charge (load) imposed on purchases as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Management fees

rr_ManagementFeesOverAssets

0.50%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.18%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.68%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[3]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

0.60%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 61

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

210

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

371

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 839

Label

rr_AverageAnnualReturnLabel

(lifetime: 12/31/08–12/31/16)

1 Year

rr_AverageAnnualReturnYear01

(0.62%)

5 Years

rr_AverageAnnualReturnYear05

2.43%

Lifetime

rr_AverageAnnualReturnSinceInception

4.43%

[1] The Fund’s investment manager, Delaware Management Company (Manager), has contractually agreed to waive all or a portion of its investment advisory fees and/or pay/reimburse expenses (excluding any 12b-1 fees, acquired fund fees and expenses, taxes, interest, inverse floater program expenses, short sale dividend and interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) in order to prevent total annual fund operating expenses from exceeding 0.56% of the Fund’s average daily net assets from Dec. 29, 2017 through Dec. 29, 2018. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund. The Fund’s Class A shares also are subject to a blended 12b-1 fee of 0.10% on all shares acquired prior to June 1, 1992 and 0.25% on all shares acquired on or after June 1, 1992.

[2] Class C shares redeemed within one year of purchase are subject to a 1.00% contingent deferred sales charge (CDSC).

[3] The Fund’s investment manager, Delaware Management Company (Manager), has contractually agreed to waive all or a portion of its investment advisory fees and/or pay/reimburse expenses (excluding any 12b-1 fees, acquired fund fees and expenses, taxes, interest, inverse floater program expenses, short sale dividend and interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) in order to prevent total annual fund operating expenses from exceeding 0.60% of the Fund’s average daily net assets from Dec. 29, 2017 through Dec. 29, 2018. In addition, the Fund’s distributor, Delaware Distributors, L.P. (Distributor), has contracted to limit the Class A shares’ 12b-1 fees to no more than 0.15% of average daily net assets from Dec. 29, 2017 through Dec. 29, 2018. These waivers and reimbursements may only be terminated by agreement of the Manager or Distributor, as applicable, and the Fund.