Partnership / S corp: 1065 / 1120-S + K-1 - filing (30 Sep 2026 year-end)
Tax year ended 30 Sep 2026. 15th of 3rd month.
Tax Due Dates Calendar
Selected U.S. federal tax filing, payment and reporting dates for October 2026 through December 2027.
Dates depend on tax year, entity, filing extensions and deposit schedule. Filing extensions generally do not extend payment deadlines. Check current IRS tax calendar guidance and any relief that applies to you.
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
|---|---|---|---|---|---|---|
| Partnership / S corp: 1065 / 1120-S + K-1 - filing (30 Sep 2026 year-end)Partnership / S corp: 1065 / 1120-S + K-1 - extended filing (31 Mar 2026 year-end)C corporation: Estimated income tax - Pay #4 (Tax year 2026) +1 more events on December 15 | ||||||
| Estate / trust: Form 1041 + K-1 - extended filing (31 Mar 2026 year-end) |
Dates in December
5 datesPartnership / S corp: 1065 / 1120-S + K-1 - extended filing (31 Mar 2026 year-end)
Tax year ended 31 Mar 2026. A timely, valid filing extension is required. 6-month extension; Form 7004.
C corporation: Estimated income tax - Pay #4 (Tax year 2026)
Period: Tax year 2026. 4th installment for calendar-year C corps.
Monthly payroll tax deposit - Nov 2026 wages
For monthly schedule depositors: federal employment taxes on wages paid in Nov 2026. Semiweekly and $100,000 next-day rules can require earlier deposits. See IRS Publication 15.
Estate / trust: Form 1041 + K-1 - extended filing (31 Mar 2026 year-end)
Tax year ended 31 Mar 2026. A timely, valid filing extension is required. 5.5-month extension; Form 7004. Fiscal-year Form 1041 generally applies to decedents' estates; most trusts use a calendar year.
