Partnership Return Deadline — March 17
Tuesday, March 17, 2026
Partnership Form 1065 due March 17, 2026 — K-1s to all partners by this date.
Who must file or pay
All partnerships and multi-member LLCs taxed as partnerships must file Form 1065 and issue Schedule K-1 to each partner by March 15.
What you need to know
Partnerships (including multi-member LLCs taxed as partnerships) file Form 1065 by March 15 each year to allow partners to receive their K-1s before the April individual filing deadline. In 2026, the deadline is Monday March 17 due to the weekend.
If your partnership operates in multiple states, you may also need to file state partnership returns — most states piggyback on the federal Form 1065 but some have separate forms and earlier deadlines (notably California, New York, and Texas).
File Form 7004 for a 6-month extension if needed. Partnerships with foreign partners have additional FIRPTA and withholding requirements. Genie flags these situations during the analysis phase.
Failure-to-file: $235 per partner per month, up to 12 months. Same structure as S-Corp penalties.
Required forms
- →Form 1065
- →Schedule K-1 (for each partner)
- →Form 7004 (extension)
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Other dates to know
S-Corp Return Deadline — March 17
S-Corporation Form 1120-S due March 17, 2026 — shareholder K-1s must be issued by this date.
C-Corp Return Deadline — April 15
C-Corporation Form 1120 due April 15, 2026 for fiscal year ending December 31, 2025.
C-Corp Extended Deadline — October 15
Final extended deadline for C-Corporation Form 1120 — October 15, 2026.