Quick answer: File IRS Form 4868 by the April deadline to get an automatic six-month extension to file, usually until October 15. The extension does not extend the time to pay; estimate what you owe and pay it by April to avoid interest and penalties.
Key Takeaways
- Form 4868 gives an automatic six-month extension to file
- It does not extend the time to pay; pay by April to avoid penalties
- You can request it free via IRS Free File or by making a payment
- Check whether your state needs a separate extension
Three ways to request an extension
- IRS Free File at irs.gov: any taxpayer can e-file Form 4868 free regardless of income.
- Make a payment at irs.gov/payments and select “extension” as the reason. Paying counts as your extension request; no separate form is needed.
- Tax software or a preparer: most tools file the extension with a couple of clicks.
What the extension covers
Only the filing deadline. If you owe tax and do not pay by April, the failure-to-pay penalty (0.5% per month) and interest accrue. Paying at least 90% of your liability by April generally avoids the penalty.
State extensions
Many states accept the federal extension automatically; some require their own form. Check your state revenue department.
Special cases
- Taxpayers living abroad get an automatic 2-month extension to June 15.
- Military in combat zones receive additional time.
- Federally declared disaster areas often get extended deadlines announced by the IRS.
After you file the extension
You will not receive a confirmation letter, but e-filed extensions generate an electronic acknowledgment. Keep it with your records.
FAQ
Does an extension increase audit risk? No, there is no evidence that extensions raise audit rates.
Can I get more time after October? Generally no; October is the final deadline.
What if I am due a refund? There is no failure-to-file penalty when you are owed a refund, but you must file within three years to claim it.
If you cannot pay by April
The most damaging misunderstanding about extensions is thinking that not being able to pay is a reason not to file. It is the opposite. The failure-to-file penalty is 5% of unpaid tax per month, ten times the 0.5% monthly failure-to-pay penalty. Filing on time or on extension while paying nothing is dramatically cheaper than doing neither.
File the extension, pay whatever you can by the April deadline, then set up a payment plan at irs.gov/payments. Short-term plans of up to 180 days have no setup fee. Long-term installment agreements carry a modest setup fee that is reduced for direct debit and waived or lowered for low-income taxpayers. Most people can apply online in a few minutes if the balance is under the online application threshold.
Interest and the reduced failure-to-pay penalty continue while you pay, but you avoid collection actions and the far larger penalty. If paying is genuinely impossible, ask about currently-not-collectible status or an offer in compromise, both of which require documentation of your finances.
Estimating what you owe when the numbers are incomplete
An extension request asks for an estimate of your total tax liability, and the estimate matters because paying at least 90% of your final liability by April generally avoids the failure-to-pay penalty.
A workable method when documents are missing: start with last year’s total tax as a baseline, adjust for known changes in income, add up withholding already paid from pay stubs and any estimated payments made, and pay the difference. If you are genuinely uncertain, overpay modestly. The excess is refunded when you file, and the cost of overpaying is a few months of foregone interest, while the cost of underpaying is a penalty plus interest.
State extensions vary more than people expect
Many states accept the federal extension automatically with nothing further required. Some require their own form. A few grant an extension only if you make a payment with it. And states with no income tax require nothing at all.
The failure mode here is assuming the federal extension covers everything and discovering a state penalty months later. Check your state revenue department’s website specifically, since the rule is not inferable from the federal one.
Situations with automatic extra time
Several groups receive additional time without filing anything. U.S. citizens and residents living outside the country receive an automatic two-month extension to June 15, and can request until October with Form 4868. Military members serving in a combat zone receive the length of their deployment plus 180 days. And taxpayers in federally declared disaster areas receive postponed deadlines announced by the IRS, which are listed on its disaster relief page and applied automatically based on your address of record.
After you file the extension
You will not receive a letter confirming the extension was granted, which unsettles people expecting one. E-filed extensions generate an electronic acknowledgment and payments produce a confirmation number; save whichever applies.
Then finish the return before October. There is no second extension for individuals, and the failure-to-file penalty applies from the October date if you miss it. If the reason you extended was a missing document such as a corrected 1099 or a K-1, follow up on it in the summer rather than in October, since chasing a document in the final week is how extensions turn into late filings.
Sources
Last updated: August 16, 2026. Written by the InfoBrief Editorial team. We link to official government and company sources and update articles when facts change. See our disclosure.