2023 Tax Deadlines for Boston Startups

In 2023, Boston-based companies have several important tax deadlines, including the April 18th federal and Massachusetts tax return filings (which can be extended until October 16th). Additionally, Massachusetts and the federal government have various tax filings due on the dates listed below.

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*Note: The federal tax deadline in 2023 falls on April 18, rather than April 15, which is a Saturday. The federal extension deadline for 2023  is October 16, since October 15 falls on a Sunday. Normally, when the tax deadline is on weekend or holiday, the deadline is moved to the next business day. However, Monday, April 17, is Emancipation Day, a holiday recognized in the District of Columbia, where the Internal Revenue Service is headquartered. Most states usually follow the same calendar for state income tax returns.

If your Delaware C-Corp Boston funded startup needs tax helpcontact us today!

BOSTON, STARTUPS AND TAXES

A 2022 survey by the Boston Globe reported that 59% of the respondents described the Boston startup ecosystem was healthy and vibrant. Boston offers a strong knowledge-based economy, with an extensive network of highly regarded universities and first-class hospitals. Boston is a center for life sciences, physical, and engineering research and development.

The most important taxing authorities for companies based in Boston are: 

In 2023, Boston based companies have several important tax deadlines, including the April 18th federal and Massachusetts tax return filings (which can be extended until October 16th). Additionally, Massachusetts and the federal government have various tax filings due on the dates listed above.


2022 Tax Deadlines for Boston Startups

2022 startup tax deadlines are supplied for reference purposes only, and should not be used when making decisions in 2023 or beyond. Always consult your tax professional, and see our disclaimer below.


  • JAN 31: Send 1099’ s to Contractors. Send W2’s to Employees. 1099-NEC for nonemployee compensation must also be e-filed to IRS on this date.
  • JAN 31: Send 1095-B and 1095-C forms to Employees.
  • JAN 31: Claim Research and Development Tax Credits on Prior Year Q4 Form 941, and file annual FUTA return on Form 940.
  • FEB 28: W-2 and 1099-MISC, 1099-NEC filings are due on this deadline if paper-filing (due MAR 31 if e-Filing). File Form 8809 for a 30-day extension.
  • FEB 28: IRS ACA Compliance 1094-B , 1095-B 1094-C and 1095-C filings are due on this deadline (if paper-filing, due MAR 31 if eFiling). File Form 8809 for a 30-day extension.
  • MAR 1: Delaware Annual Franchise Report filing deadline: Pay a min. of $400, +more if you have significant funding.
  • MAR 1: Massachusetts State Tax Form 2/Form of List for property tax assessment (billed quarterly).
  • MAR 15: Massachusetts Q1 Corporate Estimated Tax Form 355-ES due (40% of estimated tax due).
  • APR 15: Massachusetts Corporation Excise Return Form 355 due. Most corporations will pay $456. Can extend to OCT 15. (For 2022 the date is technically April 19th for Massachusetts corporations due to Patriot’s day, but we recommend getting everything finished by the 15th.)
  • APR 15: C Corp Form 1120 Tax Return deadline. Can extend to OCT 15 with submission of form 7004.
  • APR 15: File the R&D Tax Credit Form 6765with your tax return. Can extend to OCT 15 as mentioned above.
  • APR 15:  Federal Quarterly Estimated Tax 1st installment.
  • APR 29: Claim R&D Tax Credits on Q1 Form 941.
  • JUN 1: Delaware Quarterly Estimated Franchise Tax deadline, Pay 40% of estimated annual amount (if annual amount expected to exceed $5,000).
  • JUN 15:  Federal Quarterly Estimated Tax 2nd installment.
  • JUN 15: Massachusetts Q2 Corporate Estimated Tax Form 355-ES due (25% of estimated tax due).
  • JUL 29: Claim R&D Tax Credits on Q2 Form 941.
  • SEP 1: Delaware Quarterly Estimated Franchise Tax deadline, Pay 20% of estimated annual amount (if annual amount expected to exceed $5,000).
  • SEP 15: Federal Quarterly Estimated Tax 3rd installment.
  • SEP 15: Massachusetts Q3 Corporate Estimated Tax Form 355-ES due (25% of estimated tax due).
  • OCT 15: Massachusetts Corporation Excise Return Form 355 due if extended.
  • OCT 15: C Corp Form 1120 Tax Return final due date if extension was filed.
  • OCT 31: Claim your R&D Tax Credits on Q3 Form 941.
  • DEC 1: Delaware Quarterly Estimated Franchise Tax, Pay 20% of estimated annual amount (if annual amount expected to exceed $5,000).
  • DEC 15:  Federal Quarterly Estimated Tax 4th installment.
  • DEC 15: Massachusetts Q4 Corporate Estimated Tax Form 355-ES due (10% of estimated tax due).
  • ROLLING: Renew your business license annually (if applicable and your business is required to obtain a MA business license).

If your Delaware C-Corp Boston funded startup needs tax help contact us today!

View tax compliance dates for Atlanta, Austin, Boston, Chicago, Dallas, Miami, Mountain View, New York City, Palo Alto, Salt Lake City, San Francisco, San Jose, Santa Monica, Seattle, and Washington DC

How Much Does a Startup Tax Return Cost? Try Kruze Consulting's Tax Preparation Pricing Tool.

How much can your startup save in payroll taxes? Estimate your R&D tax credit using our free calculator.

Every startup is different and so are its tax compliance needs. This is only a guideline. Please consult your tax professional. IRS Circular 230 Disclaimer: To ensure compliance with IRS Circular 230, any U.S. federal tax advice provided in this communication is not intended or written to be used, and it cannot be used by the recipient or any other taxpayer for the purpose of avoiding tax penalties that may be imposed on the recipient or any other taxpayer. Copyright © Kruze Consulting

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