Every month you delay adds another 5% to the failure-to-file penalty, up to 25% of unpaid tax. File as soon as you can to stop the clock, then set a reminder so April 15 doesn't slip past you again.
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Penalties accrue monthly. Interest accrues daily. The total grows fast.
failure-to-file penalty per month or partial month, capped at 25%
IRS failure-to-file rules
failure-to-pay penalty per month on unpaid tax balance
IRS notice CP14
minimum penalty after 60 days late (or 100% of unpaid tax, whichever is less)
IRS 2026 minimum-penalty figure
Here's what the math looks like on a typical example. The failure-to-file penalty is what most of the cost comes from — it's ten times the failure-to-pay rate.
| Time past April 15 | Total penalty |
| 1 month late | $275 (5.5% combined) |
| 2 months late | $550 |
| 3 months late | $825 |
| 5 months late (cap reached) | $1,375+ |
| 12 months late (cap + ongoing FTP + interest) | $1,800+ |
The 5% failure-to-file penalty caps at month 5. After that, the 0.5% failure-to-pay penalty and 8% annual interest keep adding up until you file and pay in full.
Even one day later than April 15 starts the 5% monthly penalty. Filing this week stops it from compounding into another full month.
If you can't pay the full amount, pay something. The 0.5% failure-to-pay penalty is calculated only on the unpaid balance. The IRS offers payment plans for the rest.
If you've filed and paid on time for the last three years, you may qualify for an automatic waiver. Call the number on your IRS notice and ask, or write a letter referencing IRS Policy Statement 3-12.
An installment agreement caps interest and stops aggressive collection actions. Set it up online at irs.gov/payments if you owe under $50,000.
The cheapest insurance against next year's penalty is a free recurring reminder for April 15. The reminder form on this page does that — yearly recurrence is on by default.
If your withholding covered everything you owed, there's no late-filing penalty. The IRS only penalizes balances owed, not refunds delayed. But the refund itself has a clock: you have three years from the original April 15 deadline to claim it. After that, the money becomes property of the US Treasury.
That three-year window catches a surprising number of people. The IRS reports holding well over $1 billion in unclaimed refunds in a typical year, owed to filers who never got around to submitting. If you suspect you were owed money for an earlier tax year, file that return — even years later.
The reason most people miss the deadline isn't laziness — it's that April 15 only happens once a year, and there's no natural cue to remind you it's coming. A free recurring email reminder, set once, covers every Tax Day from now on. BoldRemind sends notifications 7, 3, and 1 day before the deadline, plus on the day itself.
The pillar page at /tax-filing/ covers the full reminder setup. If you filed an extension and the new deadline is October 15, set a second reminder for that date too — see the October 15 extension guide for why missing that one is even more expensive than missing April 15.
If you owe tax, two penalties start running: 5% of unpaid tax per month for failure to file (capped at 25%), plus 0.5% per month for failure to pay. Interest accrues daily at the IRS rate (currently 8% annual). If you're owed a refund, there's no penalty — but you have three years to claim it before the IRS keeps it.
Yes — and you should, immediately. The deadline to request an extension was also April 15, so that option is gone. Filing as soon as possible stops the 5%-per-month failure-to-file penalty from continuing to accrue. Every additional month adds another 5% up to the 25% cap.
5% of the unpaid tax balance for each month or partial month your return is late, with a maximum of 25%. The clock starts April 16. After 60 days late, there's a minimum penalty: the smaller of $510 or 100% of the unpaid tax (IRS 2026 figure).
No, but you're still penalized. If you paid the full amount by April 15 but filed the return late, you still owe the failure-to-file penalty on any tax that was due — though when the balance owed is zero or you're owed a refund, there's typically no penalty.
Sometimes. The IRS offers first-time penalty abatement if you have a clean compliance history for the prior three years. You can also request relief for "reasonable cause" — serious illness, natural disaster, or other circumstances beyond your control. Call the number on your IRS notice or file Form 843.
No. The failure-to-file and failure-to-pay penalties are both calculated as a percentage of unpaid tax. If your withholding covered everything you owed (refund situation), the penalty math comes out to zero. But you still need to file within three years to actually claim that refund.
The penalty caps at 25% of unpaid tax, but interest keeps accruing daily on both the tax and the penalties. Long-term, the IRS can file a substitute return on your behalf (usually without your deductions), garnish wages, levy bank accounts, and place liens on property. Filing late is much better than not filing at all.
A free yearly reminder that fires a week before the deadline. Cheapest insurance against another 5%-per-month penalty stack.
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