IRS Form 4868, explained
Form 4868 is the one-page form that gives individuals an automatic six-month extension to file a federal tax return. For 2026 returns, file it by April 15, 2027 to move your filing deadline to October 15, 2027.
Reviewed October 30, 2026 against IRS.gov guidance. How we check facts.
Who files Form 4868
Use Form 4868 if you file an individual return (Form 1040, 1040-SR, 1040-NR or 1040-SS) and need more time to finish it. You do not need to give a reason. Common reasons include waiting on a corrected Form 1099, a K-1 from a partnership or trust, or simply needing more time to gather records.
Don’t use Form 4868 for a business return: partnerships, corporations, estates and trusts request extensions on Form 7004. If you live and work outside the US, you already have until June 15 and can still file Form 4868 by then to reach October 15.
Filling out Form 4868, line by line
Part I asks for identification and Part II for your tax estimate. The form is short; most people finish it in a few minutes.
| Line | What to enter |
|---|---|
| 1 | Your name(s) and address. For a joint return, list both spouses in the order they will appear on the return. |
| 2–3 | Your Social Security number and, if filing jointly, your spouse’s. |
| 4 | Your estimate of total 2026 tax liability. Use your best estimate; if you expect to owe nothing, enter zero. |
| 5 | Total 2026 payments already made: withholding, estimated tax payments and credits. |
| 6 | Balance due: line 4 minus line 5, or zero. |
| 7 | The amount you are paying with the extension. Pay as much of line 6 as you can. |
| 8–9 | Check the boxes if you are out of the country on the due date or file Form 1040-NR without wages subject to withholding. |
Line numbers follow the current IRS form. Always use the version for the tax year you are extending, from IRS.gov.
Three ways to submit it
- E-file for free through IRS Free File, available to every individual regardless of income, or with any tax software that supports extensions.
- Pay electronically and select “extension”. A payment through IRS Direct Pay, your IRS Online Account, EFTPS or a card processor, marked as an extension payment, counts as your Form 4868. You don’t file the form separately.
- Mail it. Send the paper form to the address in the instructions for your state, postmarked by April 15, 2027. Use certified mail if you want proof.
Remember: Form 4868 extends the time to file, not the time to pay. If line 6 is more than zero and you don’t pay it by April 15, interest and a late-payment penalty start. If you pay at least 90% of your tax by then, the IRS generally won’t charge the late-payment penalty during the extension. More on what an extension covers.
Common mistakes
- Filing after April 15. A late Form 4868 is invalid, and late-filing penalties then run from the original due date.
- Forgetting the state extension. Some states require their own form or payment.
- Skipping the estimate. Entering zero when you know you owe can cost you the extension’s penalty relief.
- Losing the confirmation. Keep the e-file acknowledgment, payment confirmation or certified-mail receipt.