0000035315 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235228Member 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235224Member 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235225Member 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235226Member 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235227Member 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:MunicipalMarketVolatilityMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:SustainabilityRiskMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:InterestRateChangesMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:IssuerSpecificChangesMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:ManagementRiskMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member oef:RiskNotInsuredDepositoryInstitutionMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member oef:RiskLoseMoneyMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235228Member 2023-01-01 2023-12-31 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235228Member 2024-01-01 2024-12-31 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235228Member 2024-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235228Member 2022-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235228Member oef:AfterTaxesOnDistributionsMember 2024-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235228Member oef:AfterTaxesOnDistributionsMember 2022-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235228Member oef:AfterTaxesOnDistributionsAndSalesMember 2024-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235228Member oef:AfterTaxesOnDistributionsAndSalesMember 2022-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235224Member 2024-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235224Member 2022-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235225Member 2024-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235225Member 2022-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235226Member 2024-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235226Member 2022-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235227Member 2024-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:C000235227Member 2022-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:IndexIXWQ5Member 2024-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:IndexIXWQ5Member 2022-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:IndexLB015Member 2024-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-AMCIZPROMember fmr:S000075893Member fmr:IndexLB015Member 2022-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:C000235223Member 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:MunicipalMarketVolatilityMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:SustainabilityRiskMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:InterestRateChangesMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:IssuerSpecificChangesMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:ManagementRiskMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member oef:RiskNotInsuredDepositoryInstitutionMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member oef:RiskLoseMoneyMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:C000235223Member 2023-01-01 2023-12-31 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:C000235223Member 2024-01-01 2024-12-31 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:C000235223Member 2024-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:C000235223Member 2022-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:C000235223Member oef:AfterTaxesOnDistributionsMember 2024-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:C000235223Member oef:AfterTaxesOnDistributionsMember 2022-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:C000235223Member oef:AfterTaxesOnDistributionsAndSalesMember 2024-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:C000235223Member oef:AfterTaxesOnDistributionsAndSalesMember 2022-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:IndexIXWQ5Member 2024-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:IndexIXWQ5Member 2022-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:IndexLB015Member 2024-10-30 2025-10-30 0000035315 fmr:FidelitySustainableIntermediateMunicipalIncomeFund-RetailPROMember fmr:S000075893Member fmr:IndexLB015Member 2022-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:C000235213Member 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:MunicipalMarketVolatilityMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:SustainabilityRiskMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:InterestRateChangesMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:IssuerSpecificChangesMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:ManagementRiskMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member oef:RiskNotInsuredDepositoryInstitutionMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member oef:RiskLoseMoneyMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:C000235213Member 2023-01-01 2023-12-31 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:C000235213Member 2024-01-01 2024-12-31 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:C000235213Member 2024-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:C000235213Member 2022-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:C000235213Member oef:AfterTaxesOnDistributionsMember 2024-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:C000235213Member oef:AfterTaxesOnDistributionsMember 2022-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:C000235213Member oef:AfterTaxesOnDistributionsAndSalesMember 2024-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:C000235213Member oef:AfterTaxesOnDistributionsAndSalesMember 2022-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:IndexIXV4EMember 2024-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:IndexIXV4EMember 2022-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:IndexLB319Member 2024-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:IndexLB319Member 2022-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:IndexLB015Member 2024-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075888Member fmr:IndexLB015Member 2022-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:C000235216Member 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:MunicipalMarketVolatilityMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:SustainabilityRiskMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:InterestRateChangesMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:IssuerSpecificChangesMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:ManagementRiskMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member oef:RiskNotInsuredDepositoryInstitutionMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member oef:RiskLoseMoneyMember 2025-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:C000235216Member 2023-01-01 2023-12-31 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:C000235216Member 2024-01-01 2024-12-31 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:C000235216Member 2024-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:C000235216Member 2022-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:C000235216Member oef:AfterTaxesOnDistributionsMember 2024-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:C000235216Member oef:AfterTaxesOnDistributionsMember 2022-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:C000235216Member oef:AfterTaxesOnDistributionsAndSalesMember 2024-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:C000235216Member oef:AfterTaxesOnDistributionsAndSalesMember 2022-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:IndexLB083Member 2024-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:IndexLB083Member 2022-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:IndexLB015Member 2024-10-30 2025-10-30 0000035315 fmr:FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPROMember fmr:S000075891Member fmr:IndexLB015Member 2022-10-30 2025-10-30 iso4217:USD pure shares 497 2025-10-30 false 0000035315 N-1A Fidelity Salem Street Trust Fund Summary Fund/Class: Fidelity® Sustainable Intermediate Municipal Income Fund/Fidelity Advisor® Sustainable Intermediate Municipal Income Fund A, M, C, I, Z  Investment Objective Fidelity® Sustainable Intermediate Municipal Income Fund seeks as high a level of current income, exempt from federal income tax, as is consistent with the preservation of capital. Fee Table The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 39 of the prospectus and in the sales charge waiver appendix to the prospectus. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 39 of the prospectus 50000 Shareholder fees 0.0400 0.0400 0 0 0 0 0 0.0100 0 0 Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 0.75% and 0.25%, respectively. On Class C shares redeemed less than one year after purchase. Annual Operating Expenses 0.0048 0.0051 0.0052 0.0052 0.0039 0.0025 0.0025 0.0100 0 0 0.0094 0.0094 0.0094 0.0094 0.0094 0.0167 0.0170 0.0246 0.0146 0.0133 -0.0105 -0.0108 -0.0109 -0.0109 -0.0102 0.0062 0.0062 0.0137 0.0037 0.0031 Adjusted to reflect current fees. 2026-05-31 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 and if you hold your shares: 461 461 461 461 239 139 38 38 32 32 772 772 777 777 626 626 316 316 285 285 1143 1143 1154 1154 1177 1177 657 657 596 596 2183 2183 2211 2211 2487 2487 1619 1619 1480 1480 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 17% of the average value of its portfolio. 0.17 Principal Investment Strategies Normally investing at least 80% of assets in municipal securities (i) whose interest is exempt from federal income tax and (ii) that Fidelity Management & Research Company LLC (FMR) (the Adviser) believes have positive environmental, social and governance (ESG) characteristics. The municipal securities in which the fund invests are normally investment-grade (those of medium and high quality). Municipal debt securities are issued to raise money for a variety of public and private purposes, including general financing for state and local governments, financing for eligible non-profit organizations, or financing for a specific project or public facility. Municipal debt securities in which the fund invests include securities issued by U.S. territories and possessions, general obligation bonds of municipalities, local or state governments, project or revenue-specific bonds, or pre-refunded or escrowed bonds, municipal money market securities, and synthetic securities. Municipal securities usually pay a fixed, variable, or floating rate of interest, and must repay the amount borrowed, usually at the maturity of the security. Investment grade securities in which the fund invests include securities or issuers rated at least BBB- or its equivalent by at least one nationally recognized statistical ratings organization (NRSRO), or, if unrated, determined by the Adviser to be of comparable quality. Effective December 11, 2025, derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives.   Evaluating each security in which the fund invests using both a traditional municipal bond credit, structure and relative value analysis and a consideration of the Adviser's judgment about the security's ESG characteristics. When assessing a security's ESG characteristics and its eligibility for purchase, the Adviser considers the following, where available: (i) the sustainability practices of the security's issuer or obligor, as applicable (each, an "issuer"), based on an evaluation of such issuer's individual ESG profile; (ii) information on a security's use of proceeds; and (iii) any third-party designation as a green, sustainable or sustainability-linked bond. A security's positive ESG characteristics can be determined under any of those three factors.Using the Adviser's proprietary ESG ratings process to evaluate the current state of an issuer's sustainability practices using a data-driven framework that includes both proprietary and third-party data, and also provide a qualitative forward-looking assessment of an issuer's sustainability outlook provided by the Adviser's fundamental research analysts and ESG team. The Adviser's ESG ratings of issuers are derived from multiple factors, including an issuer's environmental profile, which may include, but is not limited to, carbon and toxic emissions, water management, waste management, and vulnerability to the physical impacts of climate change. An assessment of an issuer's social profile includes, but is not limited to, its approach to quality health care access, housing affordability, human capital management, community reinvestment, and safety. An assessment of an issuer's governance profile includes, but is not limited to, its principles of management, oversight and transparency, governance efficiency and structure, and consideration of anticompetitive practices. These factors are weighted based on how material the Adviser believes each factor is to an issuer's financial outlook, effectiveness at service delivery, and long-term sustainability, and not all factors may be applicable to all issuers. Issuers with an above average ESG rating as determined by the Adviser are considered to have positive ESG characteristics and well-managed ESG risks. Assessing a security's use of proceeds by considering factors that provide ESG characteristics, such as energy efficiency, environmentally sustainable management, and providing access to quality health care, essential services and affordable housing. The Adviser will generally consider bonds that finance education, health care, affordable housing, clean energy, municipal water and sewer, public transportation, and designated green bonds, among others, as having positive ESG characteristics.Managing the fund to have similar overall interest rate risk to the supplemental index (see "Additional Index Information" section of the prospectus).In addition to focusing on municipal securities with positive ESG characteristics, the Adviser analyzes the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.Normally maintaining a dollar-weighted average maturity between three and 10 years.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.Employing sustainable investing exclusion criteria to avoid investments in issuers that are directly engaged in, and/or derive significant revenue from, certain industries. Please see "Fund Basics - Investment Details - Sustainable Investing Exclusions" for additional information. 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. Sustainability Risk. Application of Fidelity Management & Research Company LLC's (FMR) (the Adviser) ESG ratings process and/or its sustainable investing exclusion criteria may affect the fund's exposure to certain issuers, sectors, regions, and countries and may affect the fund's performance depending on whether certain investments are in or out of favor. The criteria related to the fund's ESG ratings process and/or adherence to its sustainable investing exclusion criteria may result in the fund forgoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so. As a result, the fund's performance may at times be better or worse than the performance of funds that do not use ESG or sustainability criteria. There are significant differences in interpretations of what it means for an issuer to have positive ESG factors. While the Adviser believes its definitions are reasonable, the portfolio decisions it makes may differ with other investors' or advisers' views. When evaluating an issuer, the Adviser is dependent on information or data obtained through voluntary or third-party reporting that may be incomplete, inaccurate, or unavailable, which could cause the Adviser to incorrectly assess an issuer's business practices. Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease. 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 (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. Management Risk. The Adviser's application of the fund's strategy criteria may not achieve its intended results. The fund could underperform in comparison to other funds with a similar benchmark or similar objectives and investment strategies. 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 additional index has 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 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 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. institutional.fidelity.com Year-by-Year Returns The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown. The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown. 0.0599 0.0102    Highest Quarter Return 0.0708 2023-12-31    Lowest Quarter Return -0.0285 2023-09-30 Average Annual Returns Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. 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. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 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. Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. 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. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 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 -0.0302 0.0131 Return After Taxes on Distributions -0.0302 0.0131 Return After Taxes on Distributions and Sale of Fund Shares -0.0070 0.0160 Return Before Taxes -0.0302 0.0131 Return Before Taxes -0.0069 0.0208 Return Before Taxes 0.0137 0.0313 Return Before Taxes 0.0143 0.0319 Bloomberg 3-15 Year Blend (2-17) Municipal Bond Index 0.0071 0.0237 Bloomberg Municipal Bond Index 0.0105 0.0226 2022-04-13 2022-04-13 2022-04-13 2022-04-13 2022-04-13 Fund Summary Fund/Class: Fidelity® Sustainable Intermediate Municipal Income Fund/Fidelity® Sustainable Intermediate Municipal Income Fund Investment Objective Fidelity® Sustainable Intermediate Municipal Income Fund seeks as high a level of current income, exempt from federal income tax, as is consistent with the preservation of capital. Fee Table The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. Shareholder fees 0 Annual Operating Expenses 0.0043 0 0.0094 0.0137 -0.0100 0.0037 Adjusted to reflect current fees. 2026-05-31 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: 38 300 620 1528 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 17% of the average value of its portfolio. 0.17 Principal Investment Strategies Normally investing at least 80% of assets in municipal securities (i) whose interest is exempt from federal income tax and (ii) that Fidelity Management & Research Company LLC (FMR) (the Adviser) believes have positive environmental, social and governance (ESG) characteristics. The municipal securities in which the fund invests are normally investment-grade (those of medium and high quality). Municipal debt securities are issued to raise money for a variety of public and private purposes, including general financing for state and local governments, financing for eligible non-profit organizations, or financing for a specific project or public facility. Municipal debt securities in which the fund invests include securities issued by U.S. territories and possessions, general obligation bonds of municipalities, local or state governments, project or revenue-specific bonds, or pre-refunded or escrowed bonds, municipal money market securities, and synthetic securities. Municipal securities usually pay a fixed, variable, or floating rate of interest, and must repay the amount borrowed, usually at the maturity of the security. Investment grade securities in which the fund invests include securities or issuers rated at least BBB- or its equivalent by at least one nationally recognized statistical ratings organization (NRSRO), or, if unrated, determined by the Adviser to be of comparable quality. Effective December 11, 2025, derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives.   Evaluating each security in which the fund invests using both a traditional municipal bond credit, structure and relative value analysis and a consideration of the Adviser's judgment about the security's ESG characteristics. When assessing a security's ESG characteristics and its eligibility for purchase, the Adviser considers the following, where available: (i) the sustainability practices of the security's issuer or obligor, as applicable (each, an "issuer"), based on an evaluation of such issuer's individual ESG profile; (ii) information on a security's use of proceeds; and (iii) any third-party designation as a green, sustainable or sustainability-linked bond. A security's positive ESG characteristics can be determined under any of those three factors.Using the Adviser's proprietary ESG ratings process to evaluate the current state of an issuer's sustainability practices using a data-driven framework that includes both proprietary and third-party data, and also provide a qualitative forward-looking assessment of an issuer's sustainability outlook provided by the Adviser's fundamental research analysts and ESG team. The Adviser's ESG ratings of issuers are derived from multiple factors, including an issuer's environmental profile, which may include, but is not limited to, carbon and toxic emissions, water management, waste management, and vulnerability to the physical impacts of climate change. An assessment of an issuer's social profile includes, but is not limited to, its approach to quality health care access, housing affordability, human capital management, community reinvestment, and safety. An assessment of an issuer's governance profile includes, but is not limited to, its principles of management, oversight and transparency, governance efficiency and structure, and consideration of anticompetitive practices. These factors are weighted based on how material the Adviser believes each factor is to an issuer's financial outlook, effectiveness at service delivery, and long-term sustainability, and not all factors may be applicable to all issuers. Issuers with an above average ESG rating as determined by the Adviser are considered to have positive ESG characteristics and well-managed ESG risks. Assessing a security's use of proceeds by considering factors that provide ESG characteristics, such as energy efficiency, environmentally sustainable management, and providing access to quality health care, essential services and affordable housing. The Adviser will generally consider bonds that finance education, health care, affordable housing, clean energy, municipal water and sewer, public transportation, and designated green bonds, among others, as having positive ESG characteristics.Managing the fund to have similar overall interest rate risk to the supplemental index (see "Additional Index Information" section of the prospectus).In addition to focusing on municipal securities with positive ESG characteristics, the Adviser analyzes the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.Normally maintaining a dollar-weighted average maturity between three and 10 years.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.Employing sustainable investing exclusion criteria to avoid investments in issuers that are directly engaged in, and/or derive significant revenue from, certain industries. Please see "Fund Basics - Investment Details - Sustainable Investing Exclusions" for additional information. 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. Sustainability Risk. Application of Fidelity Management & Research Company LLC's (FMR) (the Adviser) ESG ratings process and/or its sustainable investing exclusion criteria may affect the fund's exposure to certain issuers, sectors, regions, and countries and may affect the fund's performance depending on whether certain investments are in or out of favor. The criteria related to the fund's ESG ratings process and/or adherence to its sustainable investing exclusion criteria may result in the fund forgoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so. As a result, the fund's performance may at times be better or worse than the performance of funds that do not use ESG or sustainability criteria. There are significant differences in interpretations of what it means for an issuer to have positive ESG factors. While the Adviser believes its definitions are reasonable, the portfolio decisions it makes may differ with other investors' or advisers' views. When evaluating an issuer, the Adviser is dependent on information or data obtained through voluntary or third-party reporting that may be incomplete, inaccurate, or unavailable, which could cause the Adviser to incorrectly assess an issuer's business practices. Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease. 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 (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. Management Risk. The Adviser's application of the fund's strategy criteria may not achieve its intended results. The fund could underperform in comparison to other funds with a similar benchmark or similar objectives and investment strategies. 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 additional index has 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 0.0625 0.0137    Highest Quarter Return 0.0715 2023-12-31    Lowest Quarter Return -0.0279 2023-09-30 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 0.0137 0.0313 Return After Taxes on Distributions 0.0137 0.0313 Return After Taxes on Distributions and Sale of Fund Shares 0.0205 0.0307 Bloomberg 3-15 Year Blend (2-17) Municipal Bond Index 0.0071 0.0237 Bloomberg Municipal Bond Index 0.0105 0.0226 2022-04-13 Fund Summary Fund: Fidelity® SAI Sustainable Conservative Income Municipal Bond Fund Investment Objective Fidelity® SAI Sustainable Conservative Income Municipal Bond Fund seeks to provide a high level of income, exempt from federal income tax, consistent with preservation of capital. Fee Table The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. Shareholder fees 0 Annual Operating Expenses 0.0020 0 0.0052 0.0072 -0.0052 0.0020 2026-05-31 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: 20 160 331 828 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 75% of the average value of its portfolio. 0.75 Principal Investment Strategies Normally investing at least 80% of assets in U.S. dollar-denominated municipal money market securities and high quality investment-grade municipal debt securities (i) whose interest is exempt from federal income tax and (ii) that Fidelity Management & Research Company LLC (FMR) (the Adviser) believes have positive environmental, social and governance (ESG) characteristics. Municipal debt securities are issued to raise money for a variety of public and private purposes, including general financing for state and local governments, financing for eligible non-profit organizations, or financing for a specific project or public facility. Municipal debt securities in which the fund invests include securities issued by U.S. territories and possessions, general obligation bonds of municipalities, local or state governments, project or revenue-specific bonds, or pre-refunded or escrowed bonds, municipal money market securities, and synthetic securities. Municipal securities usually pay a fixed, variable, or floating rate of interest, and must repay the amount borrowed, usually at the maturity of the security. Municipal money market securities are high-quality, short-term debt securities that pay a fixed, variable, or floating interest rate, and include variable rate demand notes, commercial paper, and municipal notes. Municipal securities are issued to raise money for a variety of public and private purposes, including general financing for state and local governments, financing for eligible non-profit organizations, or financing for a specific project or public facility.  High quality investment grade securities in which the fund invests include securities or issuers (i) rated at least A- or its equivalent by at least one nationally recognized statistical ratings organization (NRSRO) or similarly rated by the Adviser, and (ii) for securities with a credit maturity within one year, rated at least BBB or its equivalent by all NRSROs that rate the security and similarly rated by the Adviser. Effective December 11, 2025, derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives.   Evaluating each security in which the fund invests using both a traditional municipal bond credit, structure and relative value analysis and a consideration of the Adviser's judgment about the security's ESG characteristics. When assessing a security's ESG characteristics and its eligibility for purchase, the Adviser considers the following, where available: (i) the sustainability practices of the security's issuer or obligor, as applicable (each, an "issuer"), based on an evaluation of such issuer's individual ESG profile; (ii) information on a security's use of proceeds; and (iii) any third-party designation as a green, sustainable or sustainability-linked bond. A security's positive ESG characteristics can be determined under any of those three factors.Using the Adviser's proprietary ESG ratings process to evaluate the current state of an issuer's sustainability practices using a data-driven framework that includes both proprietary and third-party data, and also provide a qualitative forward-looking assessment of an issuer's sustainability outlook provided by the Adviser's fundamental research analysts and ESG team. The Adviser's ESG ratings of issuers are derived from multiple factors, including an issuer's environmental profile, which may include, but is not limited to, carbon and toxic emissions, water management, waste management, and vulnerability to the physical impacts of climate change. An assessment of an issuer's social profile includes, but is not limited to, its approach to quality health care access, housing affordability, human capital management, community reinvestment, and safety. An assessment of an issuer's governance profile includes, but is not limited to, its principles of management, oversight and transparency, governance efficiency and structure, and consideration of anticompetitive practices. These factors are weighted based on how material the Adviser believes each factor is to an issuer's financial outlook, effectiveness at service delivery, and long-term sustainability, and not all factors may be applicable to all issuers. Issuers with an above average ESG rating as determined by the Adviser are considered to have positive ESG characteristics and well-managed ESG risks. Assessing a security's use of proceeds by considering factors that provide ESG characteristics, such as energy efficiency, environmentally sustainable management, and providing access to quality health care, essential services and affordable housing. The Adviser will generally consider bonds that finance education, health care, affordable housing, clean energy, municipal water and sewer, public transportation, and designated green bonds, among others, as having positive ESG characteristics.Managing the fund to have similar overall interest rate risk to the supplemental index (see "Additional Index Information" section of the prospectus).In addition to focusing on municipal securities with positive ESG characteristics, the Adviser analyzes the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.Normally maintaining a dollar-weighted average maturity of one year or less.Normally investing in securities with a maximum maturity of four years.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.Employing sustainable investing exclusion criteria to avoid investments in issuers that are directly engaged in, and/or derive significant revenue from, certain industries. Please see "Fund Basics - Investment Details - Sustainable Investing Exclusions" for additional information. 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. Sustainability Risk. Application of Fidelity Management & Research Company LLC's (FMR) (the Adviser) ESG ratings process and/or its sustainable investing exclusion criteria may affect the fund's exposure to certain issuers, sectors, regions, and countries and may affect the fund's performance depending on whether certain investments are in or out of favor. The criteria related to the fund's ESG ratings process and/or adherence to its sustainable investing exclusion criteria may result in the fund forgoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so. As a result, the fund's performance may at times be better or worse than the performance of funds that do not use ESG or sustainability criteria. There are significant differences in interpretations of what it means for an issuer to have positive ESG factors. While the Adviser believes its definitions are reasonable, the portfolio decisions it makes may differ with other investors' or advisers' views. When evaluating an issuer, the Adviser is dependent on information or data obtained through voluntary or third-party reporting that may be incomplete, inaccurate, or unavailable, which could cause the Adviser to incorrectly assess an issuer's business practices. Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. 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 (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. Management Risk. The Adviser's application of the fund's strategy criteria may not achieve its intended results. The fund could underperform in comparison to other funds with a similar benchmark or similar objectives and investment strategies. 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, a hypothetical composite of market indexes, and an additional index over various periods of time. The hypothetical composite of market indexes and additional index 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, a hypothetical composite of market indexes, 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 0.0363 0.0332    Highest Quarter Return 0.0160 2023-12-31    Lowest Quarter Return 0.0053 2023-09-30 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 0.0332 0.0298 Return After Taxes on Distributions 0.0332 0.0298 Return After Taxes on Distributions and Sale of Fund Shares 0.0336 0.0298 Fidelity Conservative Income Municipal Bond Composite Index℠ 0.0310 0.0282 Bloomberg Municipal Bond 1 Year (1-2 Y) Index 0.0271 0.0254 Bloomberg Municipal Bond Index 0.0105 0.0359 2022-06-16 Fund Summary Fund: Fidelity® SAI Sustainable Municipal Income Fund Investment Objective Fidelity® SAI Sustainable Municipal Income Fund seeks to provide a high current yield exempt from federal 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. Shareholder fees 0 Annual Operating Expenses 0.0033 0 0.0036 0.0069 -0.0033 0.0036 Adjusted to reflect current fees. 2026-05-31 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: 37 176 340 816 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 3% of the average value of its portfolio. 0.03 Principal Investment Strategies Normally investing at least 80% of assets in municipal securities (i) whose interest is exempt from federal income tax and (ii) that Fidelity Management & Research Company LLC (FMR) (the Adviser) believes have positive environmental, social and governance (ESG) characteristics. The municipal securities in which the fund invests are normally investment-grade (those of medium and high quality). Municipal debt securities are issued to raise money for a variety of public and private purposes, including general financing for state and local governments, financing for eligible non-profit organizations, or financing for a specific project or public facility. Municipal debt securities in which the fund invests include securities issued by U.S. territories and possessions, general obligation bonds of municipalities, local or state governments, project or revenue-specific bonds, or pre-refunded or escrowed bonds, municipal money market securities, and synthetic securities. Municipal securities usually pay a fixed, variable, or floating rate of interest, and must repay the amount borrowed, usually at the maturity of the security. Investment grade securities in which the fund invests include securities or issuers rated at least BBB- or its equivalent by at least one nationally recognized statistical ratings organization (NRSRO), or, if unrated, determined by the Adviser to be of comparable quality. Effective December 11, 2025, derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives.   Evaluating each security in which the fund invests using both a traditional municipal bond credit, structure and relative value analysis and a consideration of the Adviser's judgment about the security's ESG characteristics. When assessing a security's ESG characteristics and its eligibility for purchase, the Adviser considers the following, where available: (i) the sustainability practices of the security's issuer or obligor, as applicable (each, an "issuer"), based on an evaluation of such issuer's individual ESG profile; (ii) information on a security's use of proceeds; and (iii) any third-party designation as a green, sustainable or sustainability-linked bond. A security's positive ESG characteristics can be determined under any of those three factors.Using the Adviser's proprietary ESG ratings process to evaluate the current state of an issuer's sustainability practices using a data-driven framework that includes both proprietary and third-party data, and also provide a qualitative forward-looking assessment of an issuer's sustainability outlook provided by the Adviser's fundamental research analysts and ESG team. The Adviser's ESG ratings of issuers are derived from multiple factors, including an issuer's environmental profile, which may include, but is not limited to, carbon and toxic emissions, water management, waste management, and vulnerability to the physical impacts of climate change. An assessment of an issuer's social profile includes, but is not limited to, its approach to quality health care access, housing affordability, human capital management, community reinvestment, and safety. An assessment of an issuer's governance profile includes, but is not limited to, its principles of management, oversight and transparency, governance efficiency and structure, and consideration of anticompetitive practices. These factors are weighted based on how material the Adviser believes each factor is to an issuer's financial outlook, effectiveness at service delivery, and long-term sustainability, and not all factors may be applicable to all issuers. Issuers with an above average ESG rating as determined by the Adviser are considered to have positive ESG characteristics and well-managed ESG risks. Assessing a security's use of proceeds by considering factors that provide ESG characteristics, such as energy efficiency, environmentally sustainable management, and providing access to quality health care, essential services and affordable housing. The Adviser will generally consider bonds that finance education, health care, affordable housing, clean energy, municipal water and sewer, public transportation, and designated green bonds, among others, as having positive ESG characteristics.Managing the fund to have similar overall interest rate risk to the supplemental index (see "Additional Index Information" section of the prospectus).In addition to focusing on municipal securities with positive ESG characteristics, the Adviser analyzes the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.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.Employing sustainable investing exclusion criteria to avoid investments in issuers that are directly engaged in, and/or derive significant revenue from, certain industries. Please see "Fund Basics - Investment Details - Sustainable Investing Exclusions" for additional information. 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. Sustainability Risk. Application of Fidelity Management & Research Company LLC's (FMR) (the Adviser) ESG ratings process and/or its sustainable investing exclusion criteria may affect the fund's exposure to certain issuers, sectors, regions, and countries and may affect the fund's performance depending on whether certain investments are in or out of favor. The criteria related to the fund's ESG ratings process and/or adherence to its sustainable investing exclusion criteria may result in the fund forgoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so. As a result, the fund's performance may at times be better or worse than the performance of funds that do not use ESG or sustainability criteria. There are significant differences in interpretations of what it means for an issuer to have positive ESG factors. While the Adviser believes its definitions are reasonable, the portfolio decisions it makes may differ with other investors' or advisers' views. When evaluating an issuer, the Adviser is dependent on information or data obtained through voluntary or third-party reporting that may be incomplete, inaccurate, or unavailable, which could cause the Adviser to incorrectly assess an issuer's business practices. Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease. 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 (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. Management Risk. The Adviser's application of the fund's strategy criteria may not achieve its intended results. The fund could underperform in comparison to other funds with a similar benchmark or similar objectives and investment strategies. 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 additional index has 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 0.0804 0.0102    Highest Quarter Return 0.0937 2023-12-31    Lowest Quarter Return -0.0376 2023-09-30 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 0.0102 0.0340 Return After Taxes on Distributions 0.0102 0.0339 Return After Taxes on Distributions and Sale of Fund Shares 0.0190 0.0332 Bloomberg 3+ Year Municipal Bond Index 0.0088 0.0224 Bloomberg Municipal Bond Index 0.0105 0.0226 2022-04-13 AClass A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 0.75% and 0.25%, respectively. BOn Class C shares redeemed less than one year after purchase. AThe management fee covers administrative services previously provided under separate services agreements with the fund, for which 0.16%, 0.20%, 0.20%, 0.21%, and 0.08% for Class A, Class M, Class C, Class I, and Class Z, respectively, was previously charged under the services agreements. BAdjusted to reflect current fees. CFidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse Class A, Class M, Class C, Class I, and Class Z of the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, 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 their respective average net assets, exceed 0.62%, 0.62%, 1.37%, 0.37%, and 0.31% (the Expense Caps). If at any time during the current fiscal year expenses for Class A, Class M, Class C, Class I, or Class Z of the fund fall below the Expense Caps, 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 Caps. These arrangements will remain in effect through May 31, 2026. FMR may not terminate these arrangements before the expiration date without the approval of the Board of Trustees and may extend them in its discretion after that date. AFrom April 13, 2022. BFrom April 13, 2022. CFrom April 13, 2022. DFrom April 13, 2022. EFrom April 13, 2022. AThe 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. BAdjusted to reflect current fees. CFidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the class of shares of the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, 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 0.37% (the Expense Cap). If at any time during the current fiscal year expenses for the class of shares 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 through May 31, 2026. FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date. AFrom April 13, 2022. AFidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, 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 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 through May 31, 2026. FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date. AFrom June 16, 2022. AAdjusted to reflect current fees. BFidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, 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 0.36% (the Expense Cap). If at any time during the current fiscal year expenses for 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 through May 31, 2026. FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date. AFrom April 13, 2022.