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Written & Technically Reviewed by Sarah Lawson, Tax Manager
✓ Verified for 2026 IRS Regulatory Compliance
Running a partnership or multi-member LLC comes with strict tax obligations. If you missed the deadline for filing your federal return, you are likely wondering what happens next. Missing the Form 1065 deadline triggers immediate and severe financial consequences, even if your business did not make a profit or owe federal taxes.
The Exact 2026 Late Filing Penalties for Form 1065
Unlike standard corporate taxes, partnerships are "pass-through" entities. Because the partnership itself generally does not pay federal income tax, the IRS heavily penalizes the failure to report information. For returns due in 2026, here is exactly what you will owe if you miss the deadline:
- The Base Penalty: The IRS assesses a late filing penalty of $255 per partner, per month or partial month, for up to 12 months.
- The K-1 Penalty: Failing to provide partners with their Schedule K-1s on time triggers an additional penalty of $340 per form.
Penalty Math Example: If your partnership has five partners and files exactly three months late, the base penalty calculation is $255 × 5 partners × 3 months. Your partnership is immediately facing a $3,825 penalty before any K-1 fines are even applied.
The "Get Out of Jail Free" Card: Rev. Proc. 84-35
If you are facing thousands of dollars in late fees, there is a specific legal safe harbor. Under Revenue Procedure 84-35, small partnerships can qualify for complete penalty relief if they meet strict criteria:
- The partnership must have 10 or fewer partners.
- All partners must be domestic, natural persons (or estates of deceased partners).
- Every single partner must have fully reported their share of the partnership income on their own timely filed personal tax returns.
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About the Reviewer: Sarah Lawson
Sarah Lawson is the Tax Manager at HurainTax. She is a dedicated member of our internal team, specializing in partnership taxation and IRS dispute resolution. Sarah oversees penalty abatement strategies, ensuring our individual and B2B CPA firm partners remain in strict compliance with evolving IRS tax codes.