C corporation: Form 1120 - filing (30 Sep 2026 year-end)
Tax year ended 30 Sep 2026. 15th of 4th 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 |
|---|---|---|---|---|---|---|
| C corporation: Form 1120 - filing (30 Sep 2026 year-end)C corporation: Form 1120 - extended filing (31 Mar 2026 year-end)Estate / trust: Form 1041 + K-1 - filing (30 Sep 2026 year-end) +2 more events on January 15 | ||||||
Dates in January
5 datesC corporation: Form 1120 - 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.
Estate / trust: Form 1041 + K-1 - filing (30 Sep 2026 year-end)
Tax year ended 30 Sep 2026. 15th of 4th month. Fiscal-year Form 1041 generally applies to decedents' estates; most trusts use a calendar year.
Individuals: Form 1040-ES payment - Pay #4 (Tax year 2026)
Period: Tax year 2026. 4th installment for 2026.
Monthly payroll tax deposit - Dec 2026 wages
For monthly schedule depositors: federal employment taxes on wages paid in Dec 2026. Semiweekly and $100,000 next-day rules can require earlier deposits. See IRS Publication 15.
