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Tax Deadlines for Startups in 2023

Tax deadlines for startups in 2023, including federal filing dates and key dates for San Francisco, New York, and Seattle.

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2023 Tax Calendars

2023 U.S. Tax Deadlines for Startups

  • JAN 31:
  • FEB 28
    • W-2 and 1099-MISC, 1099-NEC filings – if paper-filing (due March 31 if e-Filing). Additional 30 days extension – File Form 8809
    • IRS ACA Compliance 1094-B, 1095-B, 1094-C and 1095-C filings – if paper-filing (due March 31 if e-Filing). Additional 30 days extension – File Form 8809
  • MAR 1:
  • MAR 15:
    • Federal and State income tax return for S-Corp and Partnership; or
    • Federal and State income tax extension filing for S-Corp and Partnership
  • APR 17:
    • Federal and State income tax return of Individuals, Corporations; or
    • Federal and State income tax extension filing for individual, Corporations
    • Federal Quarterly Estimated Taxes (Q1)
    • FinCEN 114 – FBAR (will be allowed to extend)
  • APR 29:
    • Quarterly Sales and Use tax filing
  • MAY 2
    • R&D Tax Credit Form 941 to claim R&D credit against payroll taxes
  • MAY 16
    • Form 990 Series – Tax Exempt Organizations
    • Form 8868 – Application for Extension of Time to File an Exempt Organization Return
  • JUN 1:
  • JUN 15
    • Federal Quarterly Estimated Taxes (Q2)
  • JUL 29:
    • Quarterly Sales and Use tax filing
  • AUG 1
    • Annual Return/Report of Employee Benefit Plan
    • R&D Tax Credit Form 941 to claim R&D credit against payroll taxes
  • SEP 1:
  • SEP 15:
    • Federal Quarterly Estimated Taxes (Q3)
    • Federal and State income tax return for S-Corp and Partnership with filed extension
  • SEP 30
    • Form 1041 Extended Return
  • OCT 17:
    • Federal and State income tax return for Individuals and Corporation with filed extension
    • FinCEN 114 (Extended return)
    • Form 5500 Series Extended Return
  • OCT 31:
    • Quarterly Sales and Use tax filing
    • R&D Tax Credit Form 941(Q3) to claim R&D credit against payroll taxes
  • NOV 15
    • Form 990 Series Extended Return
  • DEC 1:
  • DEC 15:
    • Federal Quarterly Estimated Taxes (Q4)

San Francisco 2023 Tax Deadlines For Startups

  • JAN 31:
  • FEB 28:
    • W-2 and 1099-MISC, 1099-NEC filings – if paper-filing (due March 31 if e-Filing). Additional 30 days extension – File Form 8809
    • IRS ACA Compliance 1094-B, 1095-B, 1094-C and 1095-C filings – if paper-filing (due March 31 if e-Filing). Additional 30 days extension – File Form 8809
    • San Francisco Annual Gross Receipts, Payroll and Rent Tax Returns. 60-Day extension is available for filing the tax return, but not paying any tax due.
  • MAR 1:
  • MAR 15:
    • Federal and State income tax return for S-Corp and Partnership; or
    • Federal and State income tax extension filing for S-Corp and Partnership
  • APR 1:
    • SF 571-L Business Property Tax Filing Due. Initial Deadline
  • APR 10:
    • Second Installment deadline to pay the Property tax bill to San Francisco County
  • APR 17:
    • Federal and State income tax return of Individual, Trust and C-Corporation; or
    • Federal and State income tax extension filing for individual, Trust and C-Corp
    • Federal Quarterly Estimated Taxes (Q1)
    • FinCEN 114 – FBAR (will be allowed to extend)
    • California Estimated tax payment
  • APR 29:
    • Quarterly Sales and Use tax filing
    • San Francisco Quarterly (Q1) Estimated Tax Payment
  • MAY 2
    • R&D Tax Credit Form 941 to claim R&D credit against payroll taxes
  • MAY 7:
    • SF 571-L Business Property Tax Filing. Final date to avoid 10% penalty.
  • MAY 16
    • Form 990 Series – Tax Exempt Organizations
    • Form 8868 – Application for Extension of Time to File an Exempt Organization Return
  • MAY 31
    • San Francisco Business Registration Renewal
  • JUN 1:
  • JUN 15
    • Federal Quarterly Estimated Taxes (Q2)
    • California Quarterly Estimated Taxes (Q2)
  • JUL 29:
    • Quarterly Sales and Use tax filing
    • San Francisco Quarterly (Q2) Estimated Tax Payments
  • AUG 1
    • Annual Return/Report of Employee Benefit Plan
    • R&D Tax Credit Form 941 (Q2) to claim R&D credit against payroll taxes.
  • AUG 31
    • SF 571-L Business Property Tax Payment Due
  • SEP 1:
  • SEP 15:
    • Federal Quarterly Estimated Taxes (Q3)
    • Federal and State income tax return for S-Corp and Partnership with filed extension
  • SEP 30
    • Form 1041 Extended Return
  • OCT 17:
    • Federal and State income tax return for Individuals and Corporation with filed extension
    • FinCEN 114 (Extended return)
    • Form 5500 Series Extended Return
  • OCT 31:
    • Quarterly Sales and Use tax filing
    • R&D Tax Credit Form 941 (Q3) to claim R&D credit against Payroll taxes
    • San Francisco Quarterly (Q3) Estimated Tax Payments
  • NOV 15
    • Form 990 Series Extended Return
    • California Franchise Tax Due (extended)
  • DEC 1:
  • DEC 10
    • San Francisco County Property Tax Bill First Installment
  • DEC 15
    • Federal Quarterly Estimated Taxes (Q4)
    • California Quarterly Estimated Taxes (Q4)
  • VARIABLE:

New York 2023 Tax Deadlines For Startups

  • JAN 18
    • NY Estimated Tax Payment Q4 of 2021 – Individual, Partnership, and S Corp.
  • JAN 20
    • NY Sales Tax Return Due for Monthly Filers
  • JAN 31:
  • FEB 22
    • NY Sales Tax Return Due for Monthly Filers
  • FEB 28
    • W-2 and 1099-MISC, 1099-NEC filings – if paper-filing (due March 31 if e-Filing). Additional 30 days extension – File Form 8809 
    • IRS ACA Compliance 1094-B, 1095-B, 1094-C and 1095-C filings – if paper-filing (due March 31 if e-Filing). Additional 30 days extension – File Form 8809
  • MAR 15:
    • Federal and NY state and NYC  income tax return for S-Corp and Partnership; or
    • Federal and NY state and NYC  income tax extension filing for S-Corp and Partnership
  • MAR 21:
    • NY Sales Tax Return Due for Monthly Filers
    • NY Sales Tax Return Due for Quarterly Filers
    • NY Sales Tax Return Due for Annually Filers
  • APR 17:
    • Federal and NY State income tax return of Individual, Trust and C-Corporation; or
    • Federal and NY State income tax extension filing for individual, Trust and C-Corp
    • Federal Quarterly Estimated Taxes (Q1)
    • FinCEN 114 – FBAR (will be allowed to extend)
  • APR 20
    • NY Sales Tax Return Due for Monthly Filers
  • MAY 2:
    • R&D Tax Credit Form 941 (Q1) to claim R&D credit against payroll taxes
  • MAY 16
    • Form 990 Series – Tax Exempt Organizations
    • Form 8868 – Application for Extension of Time to File an Exempt Organization Return
  • MAY 20
    • NY Sales Tax Return Due for Monthly Filers
  • JUN 15:
    • Federal Quarterly Estimated Taxes (Q2)
    • NY Estimated Tax Payments
  • JUN 21:
    • NY Sales Tax Return Due for Monthly Filers
    • NY Sales Tax Return Due for Quarterly Filers
  • JUL 20
    • NY Sales Tax Return Due for Monthly Filers
  • AUG 1:
    • Annual Return/Report of Employee Benefit Plan
    • R&D Tax Credit Form 941 (Q2) to claim R&D credit against payroll taxes
  • AUG 22
    • NY Sales Tax Return Due for Monthly Filers
  • SEPT 15:
    • Federal Quarterly Estimated Taxes (Q3)
    • NY Estimated Tax Payments
    • Federal and NY State income tax return for S-Corp and Partnership with filed extension
  • SEPT 20:
    • NY Sales Tax Return Due for Monthly Filers
    • NY Sales Tax Return Due for Quarterly Filers
  • OCT 17:
    • Federal and NY State income tax return for Individuals and Corporation with filed extension
    • FinCEN 114 (Extended return)
    • Form 5500 Series Extended Return
  • OCT 31:
    • Quarterly Sales and Use tax filing
    • R&D Tax Credit Form 941 (Q3) to claim R&D credit against payroll taxes
  • NOV 21
    • Form 990 Series Extended Return
    • NY Sales Tax Return Due for Monthly Filers
  • DEC 15:
    • Federal Quarterly Estimated Taxes (Q4)
    • NY Corporation Estimated Tax Payments
  • DEC 20:
    • NY Sales Tax Return Due for Monthly Filers
    • NY Sales Tax Return Due for Quarterly Filers

See Also: 2023 tax filing dates for corporation tax, pass-through entity tax (PTET), personal income tax, sales tax, withholding tax, and metropolitan commuter transportation mobility tax (MCTMT)


Seattle 2023 Tax Deadlines For Startups

  • JAN 25
    • Prior Year Q4 Seattle Business License Tax for Quarterly Filers
  • JAN 31:
    • Washington State Fund Quarterly Report (Q4 – Payroll Tax)
    • Seattle Business License Tax Deadline for Annual Filers.
    • R&D Tax Credit Form 941 (Q4 2021) to claim R&D credit against Payroll taxes
    • 1099NEC and W-2s
    • 3921 and 3922 Stock Options Exercise reporting
  • FEB 28
    • W-2 and 1099-MISC, 1099-NEC filings – if paper-filing (due March 31 if e-Filing). Additional 30 days extension – File Form 8809
    • IRS ACA Compliance 1094-B, 1095-B, 1094-C and 1095-C filings – if paper-filing (due March 31 if e-Filing). Additional 30 days extension – File Form 8809
  • MAR 1:
  • MAR 15:
    • Federal and State income tax return for S-Corp, and Partnership
    • Federal and State income tax extension filing for S-Corp and Partnership
  • APR 17:
    • Federal and State income tax return of Individual, Trust and C-Corporation; or
    • Federal and State income tax extension filing for individual, Trust and C-Corp
    • Federal Quarterly Estimated Taxes (Q1)
    • FinCEN 114 – FBAR (will be allowed to extend)
    • Washington Annual Excise Tax Return (Business & Occupation Tax)
  • APR 29:
    • Washington Q1 Excise Tax Return
    • Washington Personal Property Tax Listing Form and 50% of Property Taxes
    • Washington State Fund Quarterly Report (Q1 – Payroll Tax)
  • MAY 2
    • R&D Tax Credit Form 941 (Q1) to claim R&D credit against payroll taxes
  • MAY 16
    • Form 990 Series – Tax Exempt Organizations
    • Form 8868 – Application for Extension of Time to File an Exempt Organization Return
  • JUN 1:
  • JUN 15
    • Federal Quarterly Estimated Taxes (Q2)
  • JUL 25
    • Seattle Q1 Business License Tax for Quarterly Filers
  • JUL 29:
    • Washington State Fund Quarterly Report (Q2 – Payroll Tax)
    • Washington Q2 Excise Tax Return
  • AUG 1
    • Annual Return/Report of Employee Benefit Plan
    • R&D Tax Credit Form 941 (Q2) to claim R&D credit against payroll taxes.
  • SEP 1:
  • SEP 15:
    • Federal Quarterly Estimated Taxes (Q3)
    • Federal and State income tax return for S-Corp and partnership with filed extension
  • SEP 30
    • Form 1041 Extended Return
  • OCT 17:
    • Federal and State income tax return for Individuals and Corporation with filed extension
    • FinCEN 114 (Extended return)
    • Form 5500 Series Extended Return
  • OCT 25
    • Seattle Q1 Business License Tax for Quarterly Filers
  • OCT 31:
    • Washington State Fund Quarterly Report (Q3 – Payroll Tax)
    • Washington Personal Property Tax Due (Remaining 50%)
    • Washington Q3 Excise Tax Return
    • R&D Tax Credit Form 941 (Q3) to claim R&D credit against Payroll taxes
  • NOV 15
    • Form 990 Series Extended Return
  • DEC 1:
  • DEC 15
    • Federal Quarterly Estimated Taxes (Q4)
  • VARIABLE:
    • Annual renewal of your business license