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March 15 is the due date for calendar-year partnership returns (Form 1065, with partner K-1s) and S corporation returns (Form 1120-S). Miss it without filing Form 7004 and the IRS charges a penalty for each partner or shareholder for every month the return is late. Lesser Tax can file within 24 hours for a flat $100.
| Due date | March 15, 2027 for Form 1065 and Form 1120-S. |
|---|---|
| Extension | File Form 7004 by March 15, 2027 to move the filing deadline to September 15, 2027. |
| Late penalty | Charged per partner or shareholder, per month late, for up to 12 months. |
| C corporations | Form 1120 is due April 15, 2027. |
Official sources:IRS: Form 1065IRS: Form 1120-SIRS: Form 7004
Updated October 2026. General information, not advice for your situation.
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Yes. 24-hour turnaround means you can upload on March 13 and file on March 14. We handle last-minute filers every year.
We can file an extension, but it's easier to just file now. Upload takes 5 minutes.
No. $100 flat whether you file in January or March 14.
We handle Form 1120 (C-Corp), Form 1065 (Partnership/LLC), and Form 1120-S (S-Corp). All include K-1 generation where applicable.
Correct. Upload your documents, we generate your return, you review it in our portal. Only pay $100 if you're satisfied and want to file.
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3 months ago
Shawn Benny
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