2027 Tax Deadlines: Filing Season Calendar for Firms | HelloBooks The 2027 federal filing season dates for tax year 2026 returns, from the IRS draft of Publication 509 (2027). Flagged as draft until the final is out.
The 2027 season is the first one with the higher 1099 threshold and the first full year of the new Schedule 1-A deductions. These dates come from the IRS draft of the 2027 calendar, so check them against the final publication before you send them to clients.
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| Date | What is due |
|---|---|
| Friday, January 15, 2027 |
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| Monday, February 1, 2027 |
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| Wednesday, February 10, 2027 |
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| Tuesday, February 16, 2027 |
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| Monday, March 1, 2027 |
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| Tuesday, March 2, 2027 |
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| Monday, March 15, 2027 |
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| Wednesday, March 31, 2027 |
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| Thursday, April 15, 2027 |
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| Friday, April 30, 2027 |
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| Monday, May 10, 2027 |
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| Tuesday, June 15, 2027 |
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| Monday, August 2, 2027 |
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| Tuesday, August 10, 2027 |
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| Wednesday, September 15, 2027 |
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| Friday, October 15, 2027 |
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| Monday, November 1, 2027 |
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| Wednesday, November 10, 2027 |
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| Wednesday, December 15, 2027 |
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Calendar-year filers. From IRS Publication 509 (2026), Tax Calendars and the IRS draft of Publication 509 (2027), which may change before it is final. Checked October 21, 2026.
In 2027 January 31 falls on a Sunday, so W-2s and 1099-NEC forms move to Monday, February 1. March 15 is a Monday, so partnership and S corporation returns are due on the day itself.
Forms 1099 issued in early 2027 report 2026 payments, which are the first ones subject to the $2,000 threshold for nonemployee compensation. Expect fewer forms from small business clients, and more questions about why.
Use the March 15 date to set the latest day you will accept business books for an on-time return. Anything after that goes to the extension list automatically, with the client told in writing.
Federal dates for calendar-year filers from IRS Publication 509. Check for disaster postponements and state dates before relying on them.
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