Business tax filing deadline: When are business taxes due in 2027?

While Tax Day is the only date some people may have on their calendars, there is more than one important business tax deadline to plan for throughout the year. Keep reading to find out important dates and when business taxes are due this tax season! We’ve outlined everything you need to know here.

The due dates you’ll need to pay attention to depend on your business income and your business structure. For example, if you’re reporting single-member Limited Liability Company (LLC) tax, you might be penciling in different tax deadlines than an S Corporation owner.

Note: The dates included below are some of the most common business tax deadlines, but the list is far from exhaustive. There may be other business-related tax due dates you need to know. Ensure you know all the essential tax-related calendar milestones for your business. Make an appointment today to review critical due dates and build a tax planning strategy with a Block Advisors certified small business tax pro.

Small business tax filing deadline and other common business tax deadlines

As this calendar is geared toward the needs of small businesses and the self-employed, it provides specific due dates for:

• Filing business tax forms
• Paying taxes
• Other actions required by federal tax law

Additionally, it calls out business and corporate tax filing deadlines throughout the tax year, including important business tax filing deadlines.

When are business taxes due in 2027 (for the 2026 tax year)?

Business tax deadlines in 2027 depend on your business structure. For calendar-year businesses, partnerships, S corporation and LLCs taxed as those generally must file their 2026 tax returns by March 15, 2027, while sole proprietorships, C corporations and LLCs taxed as those generally must file by April 15, 2027.

We’ll outline the details of these business entities and their tax filing due dates below. But if you don’t have the time to complete your small business return, let a Block Advisors small business certified tax professional assist you in all things tax.

When do businesses pay employment and payroll taxes in 2026?

Social Security and Medicare taxes — collectively referred to as Federal Insurance Contributions Act (FICA) taxes — withheld from employees’ paychecks typically must be remitted to the federal government by the 15^th day of the month following the month when the taxes were withheld, unless you are required to deposit on a semiweekly basis. Learn more about payroll tax.

Unemployment tax mandated by the Federal Unemployment Tax Act (FUTA) is due quarterly. Only employers pay this tax, not employees. If the tax liability is $500 or less, carry it over to the next quarter until it is $500 or more. Then deposit the amount due before the last day of the month after the end of the quarter. If your fourth quarter liability is $500 or less, including any undeposited amount from previous quarters, you can pay the owed amount when you file Form 940 by January 31. See additional details about FUTA filing and deposit deadlines. The calendar below includes the quarterly FUTA due dates landing in 2026.

What are the extensions affecting business tax deadlines?

The extension deadline for Partnerships, S Corps and LLCs taxed as those is March 15, 2027, giving business until September 15, 2027, to file.  The extension deadline for C Corps, Sole Proprietorships and LLCs taxed as those is April 15, 2027, giving businesses until October 15, 2027, to file.

Keep in mind that taxes are due on the original due date. 

What is corporate income tax?

The corporate income tax rate is a flat 21% and is different  from the rates that individuals pay. Check out our guide on business and corporate taxes for details.

Q1 2027: January 1 – March 31

JANUARY BUSINESS TAX DEADLINES FOR 2027

January 15, 2027

• Q4-2026 estimated quarterly tax payments due. If you pay quarterly taxes, the fourth quarter’s tax payment for 2026 is due on this day.
• 2026 estimated taxes for farmers and fishers due. If you don’t pay by this date, you must file your return and pay taxes due by March 1, 2027.

Get help paying estimated taxes for your small business with our Year-Round Tax Service.

FEBRUARY BUSINESS TAX DEADLINES FOR 2027

February 1, 2027

• 1099-NEC for non-employee compensation must be filed with the IRS and furnished to contractors. If you are an independent contractor, you should receive a copy of the IRS form around this date. 1099-MISC, 1099-K, and other 1099 forms must also be sent by this date.
• W-2 forms must be sent electronically or physically to your employees for the previous year (2026). However, employees may not necessarily receive their W-2 forms by this date.
• Quarterly FUTA tax is due for Q4 2026.

MARCH BUSINESS TAX DEADLINES FOR 2026

March 1, 2027

• Farmers and fishers who didn’t pay all estimated tax payments must file an income tax return and pay any tax liability by March 1 to avoid penalty. If you made every estimated tax payment by January 15, 2027, the due date for filing your return is April 15 (with some exceptions). See special provisions for farmers and fishermen.

March 16, 2027 (Tax deadlines for an S corporation)

• S corporation and partnership tax returns are due for calendar-year businesses. This is also the 2027 tax extension due date for S corporation and partnership tax extensions (using IRS Form 7004) and issuing Schedule K-1s to owners. This includes multi-member LLCs filing as a partnership. Learn more about the entity tax filing deadlines.

Q2 2027: April 1 – June 30

APRIL BUSINESS TAX DEADLINES FOR 2027

April 15, 2027

• Sole proprietorship and single-member LLC (that don’t elect otherwise) tax returns on Schedule C with your individual income tax return (Form 1040) are due. If you need more time to file, this is also when you would file an extension for these types of businesses.
• Corporate income tax return deadline.
• Q1-2027 estimated quarterly tax payments due. If you pay quarterly taxes, the first quarter’s payment for 2027 is due on this day.
• Retirement contribution deadline. This is the last day to contribute to retirement or other tax-advantaged savings accounts for the previous tax year. These include accounts like traditional IRAs, Roth IRAs, and Health Savings Accounts. The deadline for contributing to a SEP IRA and a solo 401(k) is also April 15 but may be extended by filing a 6-month extension.
• Report of Foreign Bank and Financial Accounts (FBAR, Tax Form 8938) is due. This applies to business-owned foreign accounts.
• Partners, certain LLC members, and S corporation shareholders should file to report business income and deductions from their Schedule K-1, K-2, and K-3 with their personal income tax returns on this date – or – request a filing extension. If the entity files an extension, shareholders or partners should also consider filing an extension. They are unlikely to receive a Schedule K-1 in time to file by the usual filing deadline.

April 30, 2027

• Quarterly FUTA tax is due for Q1 2027 if your liability is $500 or more.

JUNE BUSINESS TAX DEADLINES FOR 2027

June 15, 2027

• Q2-2027 estimated quarterly tax payments due. If you pay quarterly taxes, the second quarter’s payment for 2027 is due on this day.

Q3 2027: July 1 – September 30

JULY BUSINESS TAX DEADLINES FOR 2027

July 31, 2027

• Quarterly FUTA tax is due for Q2 2027 if your liability is $500 or more.

SEPTEMBER BUSINESS TAX DEADLINES FOR 2027

September 15, 2027

• Q3-2027 estimated quarterly tax payments due. If you pay quarterly taxes, the third quarter’s payment for 2027 is due on this day.
• Partnership and multi-member LLC business tax extension deadline if your business files a calendar year Form 1065 and filed a business tax extension this year. If you filed for an extension, Schedule K-1s must also be issued by this date.
• S corporation business tax extension deadline if your business files a calendar-year Form 1120-S and filed an extension this year. This does not apply to the owner’s individual income tax return, just the business tax return. If you filed for an extension, Schedule K-1s must also be issued by this date.

Q4 2027: October 1 – December 31

OCTOBER BUSINESS TAX DEADLINES FOR 2027

October 15, 2027

• C corporation and sole proprietorship tax filing extension deadline. This is the due date for sole proprietors and calendar-year C corporations who requested a tax extension on their 2027 tax return.

NOVEMBER BUSINESS TAX DEADLINES FOR 2027

November 1, 2027

• Quarterly FUTA tax is due for Q3 2027 if your liability is $500 or more.

DECEMBER BUSINESS TAX DEADLINES FOR 2026

December 1, 2027

• End-of-year strategic tax planning and preparation. Consider making year-end tax moves to optimize your tax outcome. While Dec. 1 isn’t an official deadline, noting the date on your calendar can give you a nudge to explore your options before the year is out.

December 15, 2027

• Q4 2027 estimated taxes are due for C corporations. This is the last day to make the fourth installment of estimated payments for the 2027 tax year.

Set up a check-in with a Block Advisors tax pro to discuss your year-end tax position today.

Fiscal year due dates and your business calendar year

Not all businesses align with a typical tax year. If your business doesn’t follow a typical calendar year, like some corporations, you should file your business tax return on the 15th day of the third month or the 15th day of the fourth month following the close of your tax year, depending on your entity’s tax classification.

Get help getting ready for business or corporate tax return due dates

Above, we listed a lot of business tax return deadlines. It’s a lot to keep in mind. We know it’s hard to stay on top of tax deadlines, so Block Advisors is here to help.

Use our Year-End Tax Filing Readiness service if you need support organizing your receipts, expenses, and other documents. Our tax pros can get your paperwork in order, helping you avoid missed deductions and maximize your outcome at tax time.

No matter the time of year, you can always rely on Block Advisors’ team of small business certified tax professionals to get your taxes right and keep your business on track. From bookkeeping and payroll to business formation, beneficial owner reporting, and tax services, Block Advisors has your back.

Make an appointment today.

Frequently Asked Questions – Business Tax Deadlines

Frequently Asked Questions

Q: When are business taxes due in 2027?
A: Business tax deadlines depend on your entity structure. Sole proprietorships and single-member LLCs file by April 15, S corporations and partnerships file by March 16, and C corporations file by April 15. Tax extension deadlines are September 15 for S corps/partnerships and October 15 for C corps and sole proprietorships.

Q: What are the quarterly estimated tax payment dates for 2027?
A: The four quarterly estimated tax payment deadlines for 2027 are January 15 (for Q4 2026), April 15 (Q1 2027), June 15 (Q2 2027), and September 15 (Q3 2027). C corporations have an additional Q4 2027 payment due December 15.

Q: When is the deadline to file 1099 and W-2 forms?
A: Businesses must file 1099-NEC forms for non-employee compensation and furnish W-2 forms to employees by February 2, 2027. This deadline also applies to other 1099 forms including 1099-MISC and 1099-K.

Q: What are FUTA tax payment deadlines for small businesses?
A: Federal Unemployment Tax Act (FUTA) payments are due quarterly if your liability is $500 or more. The 2027 deadlines are April 30 (Q1), July 31 (Q2), November 1 (Q3), and February 1, 2028 (Q4). If liability is under $500, carry it forward until it reaches $500.

Q: When do S corporation and partnership owners receive their Schedule K-1?
A: S corporation and partnership owners should receive their Schedule K-1 forms by March 15, 2027, which is the filing deadline for these entities. If the business files an extension, Schedule K-1s must be issued by September 15, 2027.

This article is for informational purposes only. The content may not constitute the most up-to-date information and should not be construed as legal advice.