How to file a business tax extension
Most businesses extend with Form 7004, filed by the original due date, which gives six more months to file. Sole proprietors use Form 4868. An extension gives you more time to file, not to pay, so estimate what you owe and pay it by the original deadline to limit penalties.
Updated November 2026 · By Pankil Kumar, Managing Partner
Quick facts
- Business form. Partnerships, S-Corps and C-Corps
- Sole proprietors. Personal extension, covers Schedule C
- Doesn't extend. Tax is still due on the original date
Which form do you use, and when?
| Business type | Return | Original due | Extension form | Extended to |
|---|---|---|---|---|
| Partnership or multi-member LLC | 1065 | March 15 | 7004 | September 15 |
| S-Corp | 1120-S | March 15 | 7004 | September 15 |
| C-Corp | 1120 | April 15 | 7004 | October 15 |
| Sole prop or single-member LLC | Schedule C | April 15 | 4868 | October 15 |
These are calendar-year dates, and weekends or holidays push them to the next business day. The IRS gives you the extension automatically if the form's on time and filled in correctly. You don't need a reason.
What does an extension not do?
It doesn't extend the time to pay. Any tax you owe is due on the original date, and interest and late-payment penalties can run from then. This matters most for C-Corps, and for owners of pass-through businesses paying through their personal return.
A partnership or S-Corp usually owes no entity-level federal income tax, so its extension mainly stops the late filing penalty. Its owners still need to pay their own tax by April 15.
How do you estimate what you owe?
Use your books through December, even if they're not finished. Work out rough profit, apply your likely tax rate, and subtract what you've paid in estimates. If you're not sure, pay a little more. Overpayments can be refunded or carried forward, and underpayments cost money.
How do you file Form 7004?
E-file it through tax software or a preparer, or mail it to the address in the form's instructions. Pay electronically using EFTPS or IRS Direct Pay for individuals. Keep the confirmation. If the IRS says you filed late, that's your proof.
Should you extend at all?
If your books aren't ready, yes. A rushed return with guessed numbers is riskier than an accurate one in September. Just don't let the extension become an excuse. If you're behind, get the books caught up in spring, while your preparer has time. State extensions can work differently, so check each state.
Sources
General information, not tax advice for your situation.
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See our business tax returns serviceDoes filing an extension increase my chances of an audit?
There's no evidence that a valid extension raises audit risk. It's a normal part of filing.
Can I file an extension after the deadline?
No. Form 7004 must be filed by the original due date, or it's not valid.
Do I need a reason for a business tax extension?
No. Form 7004 is automatic if it's filed correctly and on time.
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