Key federal income tax, estimated tax and information return deadlines for individuals and businesses.
The Dates That Actually Cost Money If You Miss Them
A missed tax deadline means penalties, interest, and — if you’re unlucky — a scramble that could have been avoided with a calendar reminder in January. Here are the most common federal tax deadlines for 2026 and 2027.
2026 Federal Tax Due Dates
January 15, 2026
Final 2025 estimated tax payment due
January 31 / February 2, 2026
Form 941 (Q4 2025), Forms W-2, Forms 1099-NEC due (Jan 31 falls on Saturday, shifts to Feb 2)
March 16, 2026
Calendar-year partnerships and S corporations: 2025 returns and K-1s due (March 15 falls on Sunday)
April 15, 2026
2025 individual returns due; Q1 2026 estimated tax due; C corporation returns due. Extension requests due
April 30, 2026
Form 941 for Q1 2026 due
June 15, 2026
Q2 2026 estimated tax payments due
July 31, 2026
Form 941 for Q2 2026 due
September 15, 2026
Q3 2026 estimated tax due. Extended partnership and S corp returns due
October 15, 2026
Extended individual returns for 2025 due. Extended C corp returns due
November 2, 2026
Form 941 for Q3 2026 due (Oct 31 falls on Saturday)
2027 Federal Tax Due Dates
January 15, 2027
Final 2026 estimated tax payment due
February 1, 2027
Form 941 (Q4 2026), W-2s, 1099-NECs due (Jan 31 falls on Sunday)
March 15, 2027
Calendar-year partnerships and S corporations: 2026 returns due
April 15, 2027
2026 individual returns due; Q1 2027 estimated tax due; C corp returns due. Extension requests due
April 30, 2027
Form 941 for Q1 2027 due
June 15, 2027
Q2 2027 estimated tax payments due
August 2, 2027
Form 941 for Q2 2027 due (July 31 falls on Saturday)
September 15, 2027
Q3 2027 estimated tax due. Extended partnership and S corp returns due
October 15, 2027
Extended individual returns for 2026 due
November 1, 2027
Form 941 for Q3 2027 due (Oct 31 falls on Sunday)
Payroll Deposit Deadlines Aren’t on This List
Employers may also owe recurring federal tax deposits on monthly or semiweekly schedules, depending on payroll size and filing history. FUTA deposits apply when thresholds are met. This page covers filing deadlines, not payroll deposit calendars — those run on their own schedule and depend on your specific deposit frequency.
Anticipate Deadlines, Don’t React to Them
A business that knows its filing calendar can plan cash flow, payroll processing, owner distributions, K-1 timing, estimated taxes, and year-end reporting without the last-minute panic. The penalty for a late S corp or partnership return starts at $250 per partner or shareholder per month for returns required to be filed in 2026. For a five-partner firm, that’s $1,250 just for being 30 days late with a return that doesn’t even have a tax balance due.