Business tax deadlines. Every federal date in one calendar.
There are 11 federal tax deadlines small business owners need to track. Plus state income tax, state sales tax, state annual reports, registered agent renewals, and 1099-NEC filings. This calendar covers every federal deadline for LLCs, S-Corps, C-Corps, and employer obligations, with extensions and how to file.
Start here.
March 15 (1065 partnership, S-Corp 1120-S), April 15 (single-member LLC Schedule C with 1040), quarterly estimated (Apr 15, Jun 15, Sep 15, Jan 15).
Form 7004 extends 1065 and 1120 by 6 months. Form 4868 extends individual 1040 by 6 months. Extensions are for filing, NOT payment.
Late 1065: $245/month per partner. Late 1120-S: $245/month per shareholder. Failure to pay: 0.5% per month of unpaid tax.
941 quarterly (April 30, July 31, October 31, January 31). 940 annual (January 31). W-2s and 1099-NECs to recipients and IRS by January 31.
Initial within 30 days for entities formed 2025+; within 30 days of changes thereafter. FinCEN penalty $500/day for non-compliance.
The full explanation.
January
Jan 15: Q4 quarterly estimated tax payment due. Jan 31: W-2s to employees, 1099-NECs to contractors. 940 annual federal unemployment. 941 Q4 quarterly. Year-end state employer filings.
February
Feb 15: W-2s and 1099-MISC (with NEC) due to IRS if paper filing. Feb 28: same forms due to IRS if electronic.
March
Mar 15: Form 1065 (partnership, multi-member LLC) due. Form 1120-S (S-Corp, including S-Corp-elected LLC) due. Both include K-1s to members/shareholders. Form 7004 extends 6 months.
April
Apr 15: Form 1120 (C-Corp) due. Form 1040 (individual, includes single-member LLC Schedule C) due. Q1 quarterly estimated tax. State income tax in most states. Form 7004 or 4868 extends 6 months.
May-June
Jun 15: Q2 quarterly estimated tax. US persons living abroad: extended 1040 due date.
July
Jul 31: 941 Q2 quarterly. Form 5500 (retirement plan returns, if applicable). State unemployment Q2 in most states.
August
Aug 15: 1065 extended return due (if Mar 15 extension filed). 1120-S extended return due. Some state returns extend to this date.
September
Sep 15: Q3 quarterly estimated tax. Final deadline for extended 1065 and 1120-S returns. October 15 final for extended 1040 in some cases.
October
Oct 15: Final deadline for extended individual 1040. Final deadline for extended C-Corp 1120 if extended.
November-December
Year-end planning: retirement contributions for solo 401(k) (employer portion has until tax filing deadline; employee portion typically year-end). Tax-loss harvesting. Equipment purchases for Section 179 expensing.
2026 deadline calendar for a multi-member LLC
| January 15, 2026 | Q4 2025 estimated tax payment |
| January 31, 2026 | W-2s to employees, 1099-NECs to contractors, 940 annual return, 941 Q4 |
| March 16, 2026 | Form 1065 (partnership) due - March 15 falls on Sunday so deadline moves to Monday |
| April 15, 2026 | Form 1040 (members' personal returns) due, Q1 2026 estimated tax |
| April 30, 2026 | 941 Q1 employer return |
| June 15, 2026 | Q2 2026 estimated tax |
| July 31, 2026 | 941 Q2 employer return |
| September 15, 2026 | Q3 2026 estimated tax, extended 1065 deadline |
| October 31, 2026 | 941 Q3 employer return |
| January 15, 2027 | Q4 2026 estimated tax |
Common questions.
What are the main business tax deadlines?
When is my business tax return due?
When are quarterly estimated taxes due?
What are the payroll tax deadlines?
Can I get an extension?
What happens if I miss a deadline?
Do deadlines differ by entity type?
How do state deadlines fit in?
Can File.Business track my tax deadlines?
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