You can request a six-month extension to file your federal tax return by submitting Form 4868 to the IRS before your return is due
A tax extension gives you extra time to gather documents, work with a tax professional, or simply finish your return without rushing. The most common way to get one is by filing Form 4868 (Application for Automatic Extension of Time To File U.S. Individual Income Tax Return) with the IRS. If you file this form by the original due date — usually April 15 — the IRS will automatically grant you until October 15 to submit your actual return.
The extension applies only to filing your return, not to paying taxes owed. If you expect to owe money, you should estimate what you'll owe and pay it by April 15 to avoid penalties and interest, even if you file the extension. If you're due a refund, there's no penalty for filing late as long as you file within the extension period.
Key Takeaways
- File Form 4868 before April 15 to get an automatic six-month extension to file your federal return.
- An extension to file is not an extension to pay — you should send estimated tax payments by April 15 if you owe money.
- You can file Form 4868 electronically through tax software, by mail, or through a tax professional.
- If you miss the April 15 deadline without filing an extension, you face failure-to-file penalties even if you don't owe taxes.
- State returns usually have their own extension deadlines and forms, which may differ from the federal deadline.
Three ways to file Form 4868
Electronic filing through tax software is the fastest method. Most major tax software platforms (TurboTax, H&R Block, TaxAct, and others) include Form 4868 as part of their filing process. You can file it directly through the software, and the IRS receives it immediately. This method also creates a record you can download and keep.
Filing by mail requires you to print Form 4868, sign it, and send it to the IRS address listed in the form's instructions. Mail it early enough that it arrives before April 15 — the postmark date is what counts, not the arrival date. Keep a copy for your records.
Having a tax professional file it means your CPA, tax attorney, or enrolled agent submits the form on your behalf. They can file electronically or by mail. If you're already working with someone on your return, ask them to handle the extension at the same time.
What to have ready before you file
Form 4868 asks for basic information: your name, address, Social Security number, and filing status. You'll also need to estimate your total tax liability for the year — the total amount you expect to owe after accounting for withholding and estimated payments you've already made.
If you're filing jointly, both spouses must sign the form (or both must authorize an electronic filing). If you file through tax software or a professional, the software or professional handles the signature requirements electronically.
You don't need to attach any documents or explain why you need the extension. The IRS grants Form 4868 automatically — there's no approval process or review. As long as you file it by April 15, you get the extension.
Paying taxes owed before the extension deadline
The extension gives you time to file your return, but the IRS still expects payment by April 15 if you owe taxes. If you can't pay the full amount, pay as much as you can by the original deadline. The IRS charges interest on any unpaid balance, calculated daily from April 15 until you pay.
You can pay through the IRS website (IRS.gov), by mail with a check or money order, by phone, or through an electronic funds withdrawal. When you pay, reference your Social Security number so the payment is matched to your account correctly.
If you underpay by April 15, you'll owe interest on the shortfall. If you significantly underpay — meaning you pay less than 90 percent of your actual tax liability — you may also face an underpayment penalty. Filing the extension doesn't reduce these penalties; only paying by April 15 does.
State tax extensions work differently
Most states follow the federal extension deadline (October 15), but some have different rules. A few states don't grant extensions at all or require a separate state form. Check your state's tax agency website to see what applies to you.
If your state requires a separate extension form, file it at the same time you file Form 4868 federally. Some states let you file their extension through the same tax software you use for federal, while others require a separate submission. Your state tax agency's website will list the exact process and deadline.
What happens if you miss the April 15 deadline without an extension
If you don't file Form 4868 by April 15 and you don't file your return by that date either, the IRS assesses a failure-to-file penalty. This penalty is usually 5 percent of the unpaid taxes for each month (or part of a month) that your return is late, up to 25 percent total. The penalty applies even if you don't owe any taxes — the IRS penalizes late filing itself.
You also begin accruing interest on any unpaid balance starting April 16. Interest compounds daily and is separate from penalties. The longer you wait to file and pay, the more interest accumulates.
If you file late but have a refund coming, there's no penalty, but you won't receive your refund until you file. The IRS won't send a refund for a year you haven't filed a return for.
After you file the extension: next steps
Once Form 4868 is filed, keep a copy or confirmation number for your records. The IRS doesn't send a confirmation letter for extensions filed electronically, but tax software usually provides a confirmation number or receipt. If you filed by mail, keep a copy of the form and the mailing receipt.
Use the extra time to gather documents, work with a tax professional, or organize your records. You still need to file your actual return by October 15 — the extension doesn't give you unlimited time. If you need more time after October 15, you can request another extension, though this is less common and the IRS may scrutinize it more closely.
If you realize you'll owe more than you estimated when you filed the extension, you can still pay additional taxes before October 15 without penalty. If you'll receive a refund, there's no rush to file by October 15, but filing sooner means you receive your refund sooner.
Frequently Asked Questions
Do I have to explain why I need an extension?
No. Form 4868 doesn't ask for a reason, and the IRS doesn't require one. The extension is automatic as long as you file the form by April 15. You don't need to justify why you need more time.
Can I file an extension if I've already missed April 15?
No. Form 4868 must be filed by April 15 to be valid. If you miss that date, you've missed the extension deadline. File your return as soon as possible to minimize penalties and interest. If you have a good reason for the delay (illness, natural disaster, military service), you may be able to request penalty relief from the IRS, but this requires a separate request after you file.
What if I file an extension but don't file my return by October 15?
You'll face failure-to-file penalties starting October 16, the same as if you'd never filed an extension. The extension only postpones the deadline; it doesn't remove the requirement to file. If you need more time, contact the IRS before October 15 to discuss your options.
Does filing an extension delay my refund?
No. If you're due a refund, filing an extension doesn't slow down the refund process. Once you file your actual return, the IRS processes it and sends your refund on the normal timeline — usually within 21 days of receiving your return. Filing early within the extension period means you get your refund sooner.
Can I file an extension for my business taxes?
Yes, but the form depends on your business structure. Sole proprietors use Form 4868 (the same as individuals). Partnerships file Form 7004, S-corporations file Form 7004, and C-corporations file Form 7004. Each has its own deadline and rules, so check the IRS website for the form that matches your business type.