Know your deadlines, what filing after October 15 can cost you, and why filing an extension is usually the smarter move. We can file it for you.
The extended deadline for your 2025 return, Oct 15, 2026, is 4 days away.
If you filed an extension, your return is due by then. If you didn't file one and haven't filed your return yet, penalties are already building, so the best move is to file as soon as you can.
These apply to most individual filers on a calendar year. Deadlines that land on a weekend or holiday move to the next business day.
Apr 15, 2026
File your 2025 return and pay any tax owed. This is also the last day to file Form 4868 for an extension.
Oct 15, 2026
The last day to file your return if you filed an extension on time. Moves to the next business day if it falls on a weekend.
Same as the regular deadline
An extension gives you more time to file, not to pay. Interest and late-payment penalties start from the regular deadline.
Regular deadline
Traditional IRA, Roth IRA and HSA contributions for the year are not extended by Form 4868.
Extended deadline
Employer contributions for the prior year can generally still be made up to the extended filing date.
3 years
To claim a refund you generally must file within 3 years of the original due date, or the refund is forfeited.
Missing the extended deadline does not end the world, but the costs add up every month. Here is what is at stake.
The largest penalty: 5% of the unpaid tax for every month or part of a month your return is late, up to 25%. Returns over 60 days late also face a minimum penalty.
An additional 0.5% of the unpaid tax per month, up to 25%. It runs from the April deadline even if you filed an extension, because an extension never covered payment.
Interest builds on unpaid tax and on penalties from the April deadline until you pay in full. The rate is reset every quarter and compounds daily.
If you do not file, the IRS can prepare a "substitute return" using only the income reported to it. It leaves out deductions and credits you would have claimed, so the tax bill is usually higher.
You have about three years from the original due date to claim a refund. After that the money becomes the Treasury's, no matter how much you were owed.
Unpaid balances lead to IRS notices, and eventually liens or levies on wages and bank accounts. A missing return can also block mortgages, financial aid, and Marketplace health-insurance premium credits.
The failure-to-file and failure-to-pay penalties are calculated on the tax that is still unpaid. If you are due a refund or already paid everything through withholding and estimated payments, there is generally no penalty for filing late. You should still file promptly, since refunds expire and an unfiled return can hold up other things.
If you do owe, the penalties stack: for the first five months the combined cost is 5% of the unpaid tax per month, and late payment keeps adding 0.5% per month after that, up to a combined maximum of roughly 47.5% before interest.
Enter the tax you expect to still owe with your return. The estimate compares filing late with no extension against filing on time with an extension but paying late. Interest and the minimum penalty are not included.
File late, no extension
$1,500
$1,350 late filing + $150 late payment (15.0% of the tax)
Extension filed, return on time, tax paid late
$150
Late payment only (1.5% of the tax)
Filing the extension saves about $1,350 in penalties in this example, before interest.
Estimate only. It uses the federal rates of 5% per month for late filing (reduced to 4.5% in months when late payment also applies, 25% cap) and 0.5% per month for late payment (25% cap). A partial month counts as a full month. Your actual bill depends on your facts, and interest is added on top.
An extension is one of the simplest ways to protect yourself from penalties and to file a more accurate return.
A timely extension means the late-filing penalty cannot start until the extended deadline. Compare 5% per month with 0.5% per month for paying late, and the extension is worth it even if you owe money.
Schedule K-1s, corrected 1099s and brokerage statements often arrive late. Filing with complete information is better than rushing and amending later.
A home sale, a new business, rental property, crypto trades, or foreign accounts all take more time to report correctly. Six more months lets your preparer do it carefully.
You can generally make SEP-IRA and Solo 401(k) employer contributions for the prior year up to the extended deadline, and they may reduce your tax. (Traditional IRA, Roth IRA and HSA contributions are not extended.)
The late-payment penalty is generally waived if you pay at least 90% of your final tax by the regular deadline and the rest when you file by the extended deadline.
Form 4868 costs nothing to file, needs no reason, and is processed for millions of taxpayers every year. Filing an extension does not by itself make your return more likely to be audited.
People assume an extension gives them until October 15 to pay. It does not. Only the filing date moves. If you owe tax, the interest and the late-payment penalty are running from Apr 15, 2026, so send in a good-faith estimate with your extension. The closer you get to your real bill, the less you pay in penalties and interest later.
You do not need to fill out any IRS forms yourself.
Even a rough estimate matters, because it sets how much you should pay with the extension. We pull together your income documents and prior-year return to give you a number.
We e-file the extension for you. It is a short form, and it must be submitted by the regular deadline to be valid.
Payment is still due on the regular date. Paying at least 90% of what you end up owing, and the rest with your return, avoids the late-payment penalty.
We prepare your full return, review it with you, and file it before the extended deadline. Both your federal and state returns are handled together.
No. A Form 4868 extension for individuals is automatic as long as it is filed by the regular deadline. You do not have to explain why you need more time.
Tell us where you are and we will tell you the cheapest way forward, whether that is an extension, filing now, or catching up on past years.
This page is general information about U.S. federal individual income tax rules and is not tax advice for your situation. Penalty rates, minimums, and deadlines are set by law and can change, and special rules apply in disaster areas, combat zones, and for taxpayers abroad. Talk to a tax professional before acting.