0000357057 2024-03-30 2024-03-30 0000357057 fmr:FidelityMassachusettsMunicipalMoneyMarketFund-PremiumPROMember fmr:S000007113Member 2024-03-30 2024-03-30 0000357057 fmr:FidelityMassachusettsMunicipalMoneyMarketFund-PremiumPROMember fmr:S000007113Member fmr:C000019442Member 2024-03-30 2024-03-30 0000357057 fmr:FidelityMassachusettsMunicipalMoneyMarketFund-PremiumPROMember fmr:S000007113Member fmr:ReturnBeforeTaxesMember fmr:C000019442Member 2024-03-30 2024-03-30 0000357057 fmr:FidelityMassachusettsMunicipalMoneyMarketFund-InstitutionalPROMember fmr:S000007113Member 2024-03-30 2024-03-30 0000357057 fmr:FidelityMassachusettsMunicipalMoneyMarketFund-InstitutionalPROMember fmr:S000007113Member fmr:C000047913Member 2024-03-30 2024-03-30 0000357057 fmr:FidelityMassachusettsMunicipalMoneyMarketFund-InstitutionalPROMember fmr:S000007113Member fmr:ReturnBeforeTaxesMember fmr:C000047913Member 2024-03-30 2024-03-30 0000357057 fmr:FidelityMassachusettsMunicipalIncomeandMunicipalMoneyMarketFund-RetailComboPROMember fmr:S000007114Member 2024-03-30 2024-03-30 0000357057 fmr:FidelityMassachusettsMunicipalIncomeandMunicipalMoneyMarketFund-RetailComboPROMember fmr:S000007114Member fmr:C000019443Member 2024-03-30 2024-03-30 0000357057 fmr:FidelityMassachusettsMunicipalIncomeandMunicipalMoneyMarketFund-RetailComboPROMember fmr:S000007114Member fmr:ReturnBeforeTaxesMember fmr:C000019443Member 2024-03-30 2024-03-30 0000357057 fmr:FidelityMassachusettsMunicipalIncomeandMunicipalMoneyMarketFund-RetailComboPROMember fmr:S000007114Member rr:AfterTaxesOnDistributionsMember fmr:C000019443Member 2024-03-30 2024-03-30 0000357057 fmr:FidelityMassachusettsMunicipalIncomeandMunicipalMoneyMarketFund-RetailComboPROMember fmr:S000007114Member rr:AfterTaxesOnDistributionsAndSalesMember fmr:C000019443Member 2024-03-30 2024-03-30 0000357057 fmr:FidelityMassachusettsMunicipalIncomeandMunicipalMoneyMarketFund-RetailComboPROMember fmr:S000007114Member fmr:IndexLB015Member 2024-03-30 2024-03-30 0000357057 fmr:FidelityMassachusettsMunicipalIncomeandMunicipalMoneyMarketFund-RetailComboPROMember fmr:S000007114Member fmr:IndexIXYHYMember 2024-03-30 2024-03-30 0000357057 fmr:FidelityMassachusettsMunicipalIncomeandMunicipalMoneyMarketFund-RetailComboPROMember fmr:S000007113Member 2024-03-30 2024-03-30 0000357057 fmr:FidelityMassachusettsMunicipalIncomeandMunicipalMoneyMarketFund-RetailComboPROMember fmr:S000007113Member fmr:C000238262Member 2024-03-30 2024-03-30 0000357057 fmr:FidelityMassachusettsMunicipalIncomeandMunicipalMoneyMarketFund-RetailComboPROMember fmr:S000007113Member fmr:ReturnBeforeTaxesMember fmr:C000238262Member 2024-03-30 2024-03-30 iso4217:USD pure 485BPOS 2024-01-31 false 0000357057 N-1A Fidelity Massachusetts Municipal Trust Fund Summary Fund: Fidelity® Massachusetts Municipal Income Fund Investment Objective Fidelity® Massachusetts Municipal Income Fund seeks a high level of current income exempt from federal income tax and Massachusetts personal income tax. Fee Table The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. In addition to the fees and expenses described below, your broker may also require you to pay brokerage commissions on purchases and sales of the fund, which are not reflected in the table and example below. Shareholder fees 0 Annual Operating Expenses 0.0044 0 0.0001 0.0045 Adjusted to reflect current fees. This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 46 144 252 567 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 annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 14 % of the average value of its portfolio. 0.14 Principal Investment Strategies Normally investing at least 80% of assets in investment-grade municipal securities whose interest is exempt from federal and Massachusetts personal income taxes. Managing the fund to have similar overall interest rate risk to the supplemental index. Allocating assets across different market sectors and maturities. Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects. Analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments. Principal Investment Risks Municipal Market Volatility. The municipal market is volatile and can be significantly affected by adverse tax, legislative, or political changes and the financial condition of the issuers of municipal securities. Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease. Geographic Concentration. Unfavorable political or economic conditions within Massachusetts can affect the credit quality of issuers located in that state. Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a security to decrease. In addition, the fund is classified as non-diversified under the Investment Company Act of 1940 (1940 Act), which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund. An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency .   You could lose money by investing in the fund. Unlike individual debt securities, which typically pay principal at maturity, the value of an investment in the fund will fluctuate. In addition, the fund is classified as non-diversified under the Investment Company Act of 1940 (1940 Act), which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund. An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency .   You could lose money by investing in the fund. Performance The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for more recent performance information. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. Past performance (before and after taxes) is not an indication of future performance. www.fidelity.com Year-by-Year Returns 0.0996 0.0336 -0.0011 0.0548 0.0024 0.0708 0.0444 0.0144 -0.0905 0.0575    Highest Quarter Return 0.0691 2023-12-31    Lowest Quarter Return -0.0601 2022-03-31 Average Annual Returns After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. Return Before Taxes 0.0575 0.0176 0.0273 Return After Taxes on Distributions 0.0575 0.0172 0.0265 Return After Taxes on Distributions and Sale of Fund Shares 0.0444 0.0190 0.0274 Bloomberg Municipal Bond Index 0.0640 0.0225 0.0303 Bloomberg Massachusetts Enhanced Municipal Linked Index 0.0557 0.0194 0.0295 Fund Summary Fund /Class: Fidelity® Massachusetts Municipal Money Market Fund /Fidelity® Massachusetts Municipal Money Market Fund   Investment Objective Fidelity® Massachusetts Municipal Money Market Fund seeks as high a level of income, exempt from federal and Massachusetts personal income tax, as is consistent with the preservation of capital and liquidity. Fee Table The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. In addition to the fees and expenses described below, your broker may also require you to pay other fees, such as brokerage commissions on purchases and sales of certain classes of shares of the fund and other fees to financial intermediaries, which are not reflected in the tables and examples below. Shareholder fees 0 Annual Operating Expenses 0.0020 0 0.0022 0.0042 This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 43 135 235 530 Principal Investment Strategies Normally investing in municipal money market securities. Normally investing at least 80% of assets in municipal securities whose interest is exempt from federal and Massachusetts personal income taxes. Potentially investing up to 20% of assets in municipal securities whose interest is subject to Massachusetts personal income tax. Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects. Investing in compliance with industry-standard regulatory requirements for money market funds for the quality, maturity, liquidity, and diversification of investments. Principal Investment Risks Municipal Market Volatility. The municipal market is volatile and can be significantly affected by adverse tax, legislative, or political changes and the financial condition of the issuers of municipal securities. Interest Rate Changes. Interest rate increases can cause the price of a money market security to decrease. Income Risk. A low or negative interest rate environment can adversely affect the fund's yield. Foreign Exposure. Entities providing credit support or a maturity-shortening structure that are located in foreign countries can be affected by adverse political, regulatory, market, or economic developments in those countries . Geographic Concentration. Unfavorable political or economic conditions within Massachusetts can affect the credit quality of issuers located in that state. Issuer-Specific Changes. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a money market security to decrease.   You could lose money by investing in the fund.   Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. The fund may impose a fee upon the sale of your shares .   An investment in the fund is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.   Fidelity Investments and its affiliates, the fund's sponsor, is not required to reimburse the fund for losses , and you should not expect that the sponsor will provide financial support to the fund at any time , including during periods of market stress .   You could lose money by investing in the fund.   Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. The fund may impose a fee upon the sale of your shares .   An investment in the fund is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Fidelity Investments and its affiliates, the fund's sponsor, is not required to reimburse the fund for losses , and you should not expect that the sponsor will provide financial support to the fund at any time , including during periods of market stress . Performance The following information is intended to help you understand the risks of investing in the fund. The information illustrates the performance of the fund's shares over the past year .   Past performance is not an indication of future performance. Visit www.fidelity.com for more recent performance information. The information illustrates the performance of the fund's shares over the past year . Past performance is not an indication of future performance. www.fidelity.com Year-by-Year Returns 0.0273    Highest Quarter Return 0.0075 2023-12-31    Lowest Quarter Return 0.0058 2023-03-31 Average Annual Returns Fidelity® Massachusetts Municipal Money Market Fund 0.0273 0.0256 2022-09-22 Fund Summary Fund /Class: Fidelity® Massachusetts Municipal Money Market Fund /Institutional   Investment Objective Fidelity® Massachusetts Municipal Money Market Fund seeks as high a level of income, exempt from federal and Massachusetts personal income tax, as is consistent with the preservation of capital and liquidity. Fee Table The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. In addition to the fees and expenses described below, your broker may also require you to pay other fees, such as brokerage commissions on purchases and sales of certain classes of shares of the fund and other fees to financial intermediaries, which are not reflected in the tables and examples below. Shareholder fees 0 Annual Operating Expenses 0.0020 0 0.0005 0.0025 -0.0005 0.0020 will remain in effect for at least one year from the effective date of the prospectus This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 20 64 113 255 Principal Investment Strategies Normally investing in municipal money market securities. Normally investing at least 80% of assets in municipal securities whose interest is exempt from federal and Massachusetts personal income taxes. Potentially investing up to 20% of assets in municipal securities whose interest is subject to Massachusetts personal income tax. Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects. Investing in compliance with industry-standard regulatory requirements for money market funds for the quality, maturity, liquidity, and diversification of investments. Principal Investment Risks Municipal Market Volatility. The municipal market is volatile and can be significantly affected by adverse tax, legislative, or political changes and the financial condition of the issuers of municipal securities. Interest Rate Changes. Interest rate increases can cause the price of a money market security to decrease. Income Risk. A low or negative interest rate environment can adversely affect the fund's yield. Foreign Exposure. Entities providing credit support or a maturity-shortening structure that are located in foreign countries can be affected by adverse political, regulatory, market, or economic developments in those countries . Geographic Concentration. Unfavorable political or economic conditions within Massachusetts can affect the credit quality of issuers located in that state. Issuer-Specific Changes. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a money market security to decrease.   You could lose money by investing in the fund.   Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. The fund may impose a fee upon the sale of your shares .   An investment in the fund is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.   Fidelity Investments and its affiliates, the fund's sponsor, is not required to reimburse the fund for losses , and you should not expect that the sponsor will provide financial support to the fund at any time , including during periods of market stress .   You could lose money by investing in the fund.   Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. The fund may impose a fee upon the sale of your shares .   An investment in the fund is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Fidelity Investments and its affiliates, the fund's sponsor, is not required to reimburse the fund for losses , and you should not expect that the sponsor will provide financial support to the fund at any time , including during periods of market stress . Performance The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year.   Past performance is not an indication of future performance. Visit www.fidelity.com or institutional.fidelity.com for more recent performance information. The information illustrates the changes in the performance of the fund's shares from year to year. Past performance is not an indication of future performance. www.fidelity.com or institutional.fidelity.com Year-by-Year Returns 0.0004 0.0006 0.0031 0.0066 0.0123 0.0131 0.0043 0.0002 0.0096 0.0296    Highest Quarter Return 0.0080 2023-12-31    Lowest Quarter Return 0.0000 2021-03-31 Average Annual Returns Institutional Class 0.0296 0.0113 0.0079 Fund Summary Fund /Class: Fidelity® Massachusetts Municipal Money Market Fund /Premium   Investment Objective Fidelity® Massachusetts Municipal Money Market Fund seeks as high a level of income, exempt from federal and Massachusetts personal income tax, as is consistent with the preservation of capital and liquidity. Fee Table The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. In addition to the fees and expenses described below, your broker may also require you to pay other fees, such as brokerage commissions on purchases and sales of certain classes of shares of the fund and other fees to financial intermediaries, which are not reflected in the tables and examples below. Shareholder fees 0 Annual Operating Expenses 0.0020 0 0.0010 0.0030 This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 31 97 169 381 Principal Investment Strategies Normally investing in municipal money market securities. Normally investing at least 80% of assets in municipal securities whose interest is exempt from federal and Massachusetts personal income taxes. Potentially investing up to 20% of assets in municipal securities whose interest is subject to Massachusetts personal income tax. Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects. Investing in compliance with industry-standard regulatory requirements for money market funds for the quality, maturity, liquidity, and diversification of investments. Principal Investment Risks Municipal Market Volatility. The municipal market is volatile and can be significantly affected by adverse tax, legislative, or political changes and the financial condition of the issuers of municipal securities. Interest Rate Changes. Interest rate increases can cause the price of a money market security to decrease. Income Risk. A low or negative interest rate environment can adversely affect the fund's yield. Foreign Exposure. Entities providing credit support or a maturity-shortening structure that are located in foreign countries can be affected by adverse political, regulatory, market, or economic developments in those countries . Geographic Concentration. Unfavorable political or economic conditions within Massachusetts can affect the credit quality of issuers located in that state. Issuer-Specific Changes. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a money market security to decrease.   You could lose money by investing in the fund.   Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. The fund may impose a fee upon the sale of your shares .   An investment in the fund is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.   Fidelity Investments and its affiliates, the fund's sponsor, is not required to reimburse the fund for losses , and you should not expect that the sponsor will provide financial support to the fund at any time , including during periods of market stress .   You could lose money by investing in the fund.   Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. The fund may impose a fee upon the sale of your shares .   An investment in the fund is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Fidelity Investments and its affiliates, the fund's sponsor, is not required to reimburse the fund for losses , and you should not expect that the sponsor will provide financial support to the fund at any time , including during periods of market stress . Performance The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year.   Past performance is not an indication of future performance. Visit www.fidelity.com for more recent performance information. The information illustrates the changes in the performance of the fund's shares from year to year. Past performance is not an indication of future performance. www.fidelity.com Year-by-Year Returns 0.0004 0.0006 0.0024 0.0056 0.0113 0.0121 0.0037 0.0002 0.0088 0.0285    Highest Quarter Return 0.0078 2023-12-31    Lowest Quarter Return 0.0000 2021-03-31 Average Annual Returns Premium Class 0.0285 0.0106 0.0073 A Adjusted to reflect current fees. B The management fee covers administrative services previously provided under separate services agreements with the fund, for which 0.11% was previously charged under the services agreements. A From September 22, 2022 . A Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse Institutional Class of the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of its average net assets, exceed 0.20%  (the Expense Cap). If at any time during the current fiscal year expenses for Institutional Class of the fund fall below the Expense Cap, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Cap. This arrangement will remain in effect for at least one year from the effective date of the prospectus . FMR may not terminate this arrangement without the approval of the Board of Trustees and may extend it in its discretion after that date.