How to File a Tax Extension. A Simple Guide.

By Paco De Leon

Cartoon stack of money wearing sunglasses, sitting in a chair, reading a newspaper, holding a “#1” coffee mug, and crossing its legs.

A tax extension is one of the most misunderstood tools in the tax code. People hear “extension” and think it means something went wrong, that they’re behind, that they’re going to get flagged. None of that is true. An extension is just a form you file that gives you six more months to submit your tax return. That’s it. The IRS doesn’t care why you need it, they don’t penalize you for filing one, and it’s not a red flag for an audit.

In fact, filing an extension is often the smarter move. It gives you time to get your books right, gather all your documents, and work with a tax preparer who isn’t rushing through your return at 11pm on April 14th. A rushed return full of errors or missed deductions will cost you more than taking the extra time to do it correctly. It’s free to file, it’s normal — tax professionals file extensions all the time, including for themselves — and it means the return you eventually submit is accurate instead of just on time.

An Extension to File, Not to Pay

The one thing you absolutely need to understand before we go any further: an extension to file is not an extension to pay. I know, it’s confusing. You’d think the word “extension” would mean you get more time for everything, but the IRS doesn’t work that way. They’re giving you more time to get your paperwork together, not more time to come up with the money. Whatever you owe is still due by the original deadline — April 15 for most people. If you don’t pay by then, you’ll owe interest and penalties on top of whatever your tax bill is. So yes, file the extension, but also estimate what you owe and send a payment. Even a rough estimate is better than sending nothing.

1. Use the Right Forms

This depends on what kind of business you have (or if you’re just filing a personal return). Here’s the breakdown.

Tax Filing Deadlines
Business Type Form Covers Original Extended File Via
Sole Proprietors & Single-Member LLCs Form 4868 1040 + Schedule C Apr 15 Oct 15 IRS Free File
Partnerships & Multi-Member LLC Form 7004 Business Return Mar 16 Sep 15 TaxAct
S Corporations Form 7004 Business Return Mar 16 Sep 15 TaxAct
C Corporations Form 7004 Business Return Apr 15 Oct 15 TaxAct
All business owners filing personal return Form 4868 1040 Apr 15 Oct 15 IRS Free File
📅 Fiscal year businesses: If your business doesn’t operate on a calendar year, your deadline is the 15th day of the fourth month after your fiscal year ends. An extension pushes that out six months.

If you’re a business owner, you probably need to file two extensions — one for your business return (Form 7004) and one for your personal return (Form 4868). The business return uses tax software like TaxAct because IRS Free File doesn’t support Form 7004. For your personal return, IRS Free File works fine and it’s free.

A Note on State Taxes

This guide covers federal extensions only. Most states have their own extension process — some automatically grant you a state extension when you file a federal one, others require a separate filing. Check your state’s tax authority website or ask your tax preparer what’s required where you live.

2. File the Extension

The actual filing takes less than 30 minutes. Most people spend more time worrying about it than actually doing it.

Step 2: File Your Extension
Form 4868
Personal
Sole Props, Single-Member LLCs & all personal returns
  • Use IRS Free File or your tax software provider — it’s free.
  • Create an account, follow the prompts, and the system guides you through the process.
  • Extends your deadline from April 15 → October 15.
Form 7004
Business
Partnerships, Multi-Member LLCs, S-Corps & C-Corps
  • Must be filed with tax software like TaxAct — we recommend it.
  • Extends your deadline from March 16 → September 15 (S-Corps & Partnerships).
⚠️ IRS Free File does NOT support Form 7004
💡 If you’re a business owner, you likely need to file two extensions — one for your business return (Form 7004) and one for your personal return (Form 4868).

3. Pay Your Taxes

This is the part most people skip. You already know the extension doesn’t extend the payment deadline, so you need to estimate what you owe and send a payment by April 15 (or whatever your original deadline is). You don’t need a perfect number, you can use last year’s number as a starting off point and make adjustments accordingly. Alternatively, we built a calculator to help.

Plug in your numbers and it’ll give you a reasonable estimate to send with your extension. If you overpay, you get a refund. If you underpay, the IRS charges interest and penalties on the difference.

Need Help?

Hell Yeah Taxes does tax prep for individuals, freelancers, and small businesses. Our tax advisors have been working with self-employed people and creative businesses for over a decade. And if your books need work before we can file, we can help with that too.

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