📅 September 15 · Form 1120-S, 1065, 1040-ES
Extended S-Corp/Partnership & Q3 Tax
If you filed an extension in March, your S-Corp or Partnership return is now due. Also the third quarterly estimated tax payment.
Who: S-Corps, Partnerships on extension; self-employed
⚠️ Penalty for Missing This Deadline
Same per-partner/shareholder penalties apply. K-1s must get to owners.
Tips to Stay on Track
1
Don't forget: Q3 estimated payment is also due today
2
Get K-1s to partners immediately so they can file personal returns
3
If you need more time, there's no second extension — file today
Other Tax Deadlines
Related Resources
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