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2026 Tax Deadlines for Boston Startups
In 2026, Boston-based companies have several important tax deadlines, including the April 15th federal and Massachusetts tax return filings (which can be extended until October 15th). Additionally, Massachusetts and the federal government have various tax filings due on the dates listed below.
Claim Research & Development Tax Credits on Form 941, and file annual Federal Unemployment Tax Act (FUTA) return on Form 940. Use our handy calculator to estimate your possible research and development tax credit.
2 Feb 2026
Boston startups should send 1099s to contractors. Send W2s to employees and e-file 1099-MISC for non-employee compensation with the IRS. Or file Form 8809 for a 30-day extension to file W2s and 1099-MISC for non-employee compensation.
1 Mar 2026
Delaware Annual Franchise Report filing deadline. Your Boston startup will pay a minimum of $400, which increases if you have significant funding.
For Boston startups, IRS ACA Compliance 1094-B, 1095-B, 1094-C, and 1095-C filings are due (if paper-filing, due April 1 if eFiling). File Form 8809 for a 30-day extension.
2 Mar 2026
Send 1095-B and 1095-C forms to employees.
3 Mar 2026
IRS 30-day automatic extension: provide Form 1095-B and Form 1095C to employees.
C Corp Form 1120 Tax Return due. The Federal Form 1120 is the U.S. Corporation Income Tax Return, which the IRS has companies use to report their income, losses, credits, etc., and to figure the income tax liability of the corporation. Can extend the deadline to Oct. 15. All Boston startups are required to file this Federal form by this deadline unless they file an extension.
File the R&D Tax Credit Form 6765 with your tax return. Can extend to October 15. We strongly recommend working with a qualified CPA to prepare this form in conjunction with your Form 1120 if your company is going to be acquired by a major technology company, that company’s CFO will use a strong tax team to do due diligence on this.
15 Apr 2026
Due date for Boston startup employees to make contributions to Individual Retirement Accounts (IRAs) for 2025 (Employee Benefits).
30 Apr 2026
Boston startups can claim Research & Development Tax Credits on Form 941.
Claim Research & Development Tax Credits on Form 941, and file annual Federal Unemployment Tax Act (FUTA) return on Form 940. Use our handy calculator to estimate your possible research and development tax credit.
Boston startups should send 1099s to contractors. Send W2s to employees and e-file 1099-MISC for non-employee compensation with the IRS. Or file Form 8809 for a 30-day extension to file W2s and 1099-MISC for non-employee compensation.
01
Mar
2026
Delaware Annual Franchise Report filing deadline. Your Boston startup will pay a minimum of $400, which increases if you have significant funding.
For Boston startups, IRS ACA Compliance 1094-B, 1095-B, 1094-C, and 1095-C filings are due (if paper-filing, due April 1 if eFiling). File Form 8809 for a 30-day extension.
Send 1095-B and 1095-C forms to employees.
03
Mar
2026
IRS 30-day automatic extension: provide Form 1095-B and Form 1095C to employees.
C Corp Form 1120 Tax Return due. The Federal Form 1120 is the U.S. Corporation Income Tax Return, which the IRS has companies use to report their income, losses, credits, etc., and to figure the income tax liability of the corporation. Can extend the deadline to Oct. 15. All Boston startups are required to file this Federal form by this deadline unless they file an extension.
File the R&D Tax Credit Form 6765 with your tax return. Can extend to October 15. We strongly recommend working with a qualified CPA to prepare this form in conjunction with your Form 1120 if your company is going to be acquired by a major technology company, that company’s CFO will use a strong tax team to do due diligence on this.
Due date for Boston startup employees to make contributions to Individual Retirement Accounts (IRAs) for 2025 (Employee Benefits).
30
Apr
2026
Boston startups can claim Research & Development Tax Credits on Form 941.
Note: The federal tax deadline in 2026 falls on April 15. The federal extension deadline for 2026 is October 15. 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
Boston’s startup ecosystem continues to thrive in 2026, bolstered by its world-class research universities, renowned hospitals, and deep corporate partnerships. The city ranks in the global top five for innovation and startup activity, with more than 3,200 active startups – about 6% of all U.S. startups – across sectors such as biotech, AI, energy, fintech, and robotics. Boston’s founding environment is powered by legendary accelerators like MassChallenge and Techstars Boston, with a strong talent pipeline from Harvard, MIT, and more.
Massachusetts retains its top spot for innovation, and Boston’s deep tech, biotech, and AI clusters consistently attract record-breaking venture capital – over $13 billion deployed in 2025 alone. Startups benefit from unique funding opportunities, including NIH grants, hospital innovation funds, and robust corporate and university support for commercialization and scale.
For tax and compliance, Boston-based startups should coordinate filings with the Massachusetts Department of Revenue, Suffolk County Comptroller’s Office, andCity of Boston. Key deadlines in 2026 include the April 15th federal and state tax return date, with extensions until October 15th, as well as rolling dates for federal and Massachusetts obligations throughout the year.
Boston’s highly educated talent base, coupled with strong public–private cooperation and ongoing investment in new tech hubs and innovation districts, delivers the critical infrastructure, connectivity, and funding for ambitious founders to scale globally in 2026.
In 2026, Boston-based companies have several important tax deadlines, including the April 15th federal and Massachusetts tax return filings (which can be extended until October 15th). Additionally, Massachusetts and the federal government have various tax filings due on the dates listed above.
Last Year's Tax Deadlines For Boston Startups
2025 startup tax deadlines are supplied for reference purposes only,
and should not be used when making decisions in 2025 or beyond.
Always consult your tax professional, and see our disclaimer below.
Total 29 Tax events for Boston in 2025
Click The Links To Learn More About These Filings And 2025
Boston Startup Tax Deadlines
Boston startups should send 1099s to contractors. Send W2s to employees and e-file 1099-MISC for non-employee compensation with the IRS. Or file Form 8809 for a 30-day extension to file W2s and 1099-MISC for non-employee compensation.
28 Feb 2025
For Boston startups, IRS ACA Compliance 1094-B, 1095-B, 1094-C, and 1095-C filings are due (if paper-filing, due April 1 if eFiling). File Form 8809 for a 30-day extension.
C Corp Form 1120 Tax Return due. The Federal Form 1120 is the U.S. Corporation Income Tax Return, which the IRS has companies use to report their income, losses, credits, etc., and to figure the income tax liability of the corporation. Can extend the deadline to Oct. 15. All Boston startups are required to file this Federal form by this deadline unless they file an extension.
File the R&D Tax Credit Form 6765 with your tax return. Can extend to October 15. We strongly recommend working with a qualified CPA to prepare this form in conjunction with your Form 1120 if you are a high-growth startup – if your company is going to be acquired by a major technology company, that company’s CFO will use a strong tax team to do due diligence on this.
15 Apr 2025
Due date for Boston startup employees to make contributions to Individual Retirement Accounts (IRAs) for 2023 (Employee Benefits).
Boston startups should send 1099s to contractors. Send W2s to employees and e-file 1099-MISC for non-employee compensation with the IRS. Or file Form 8809 for a 30-day extension to file W2s and 1099-MISC for non-employee compensation.
28
Feb
2025
For Boston startups, IRS ACA Compliance 1094-B, 1095-B, 1094-C, and 1095-C filings are due (if paper-filing, due April 1 if eFiling). File Form 8809 for a 30-day extension.
C Corp Form 1120 Tax Return due. The Federal Form 1120 is the U.S. Corporation Income Tax Return, which the IRS has companies use to report their income, losses, credits, etc., and to figure the income tax liability of the corporation. Can extend the deadline to Oct. 15. All Boston startups are required to file this Federal form by this deadline unless they file an extension.
File the R&D Tax Credit Form 6765 with your tax return. Can extend to October 15. We strongly recommend working with a qualified CPA to prepare this form in conjunction with your Form 1120 if you are a high-growth startup – if your company is going to be acquired by a major technology company, that company’s CFO will use a strong tax team to do due diligence on this.
Due date for Boston startup employees to make contributions to Individual Retirement Accounts (IRAs) for 2023 (Employee Benefits).
Find important local and city-specific startup tax deadlines here, including state and municipal filing dates, estimated payment deadlines, and key compliance requirements for major business hubs.
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