What happens if I file my taxes late?
Two separate penalties can apply: one for filing late and one for paying late, and the filing penalty accrues far faster. Interest runs on unpaid tax from the original due date. An extension moves the filing deadline, not the payment deadline. Filing on time and paying what you can is generally cheaper than doing neither.
For tax year 2025
- the smaller of the tax due or $525 (minimum late-filing penalty (returns due in 2026), 2025)
Key points
- Failure to file and failure to pay are two separate penalties, and the failure-to-file penalty accrues at ten times the monthly rate of the failure-to-pay penalty.
- Filing a return on time and paying what you can is generally far cheaper than filing nothing, because it removes the faster of the two penalties.
- An extension of time to file does not extend the time to pay; the failure-to-pay penalty and interest still run from the original due date.
- Interest accrues on unpaid tax from the original due date, is reset quarterly, compounds daily, and is generally not abated by the IRS.
- A return more than 60 days late carries a minimum late-filing penalty set as the smaller of the tax owed or a fixed statutory amount.
What are the two penalties and how do they differ?
Filing late and paying late are separate failures. The failure-to-file penalty is charged for each month or part of a month a return is late, and it accrues at ten times the monthly rate of the failure-to-pay penalty, which is charged for each month or part of a month that tax stays unpaid after the due date. Each stops at a cap expressed as a share of the tax owed.
Because of that difference in rate, the filing penalty reaches its cap quickly and the payment penalty takes years to get there. Once a return is more than 60 days late, a minimum late-filing penalty also applies, calculated as the smaller of the tax owed or a fixed amount that is updated for the year the return was due.
Why file on time if you cannot pay?
Because filing removes the faster penalty. Someone who files on time and pays nothing faces the slower failure-to-pay penalty and interest. Someone who files nothing faces both, led by the penalty that accrues ten times as quickly, plus the same interest. The two do not simply add: in any month where both apply, the failure-to-file penalty is reduced by the failure-to-pay penalty for that month, so the combined charge stays at the failure-to-file rate rather than stacking on top of it.
Filing is also the gateway to the options. Payment arrangements are built around a filed return, and requesting an installment agreement with a return filed by its due date halves the monthly failure-to-pay rate for the months the agreement is in effect. The rate moves the other way — upward, to double — if tax remains unpaid 10 days after the IRS issues a notice of intent to levy property.
How does interest work, and does an extension help?
Interest is not a penalty and is not affected by either of them. It accrues on unpaid tax from the due date of the return without extensions until the tax is paid in full, at a rate that is reset quarterly and compounds daily. The IRS generally does not abate interest, and it keeps accruing until assessed tax, penalties, and interest are all paid. Payments are applied to tax first, then penalties, then interest, so paying part of a balance shrinks the base everything else is computed on.
An extension extends the time to file and not the time to pay. Tax unpaid after the original due date attracts the failure-to-pay penalty and interest even with a valid extension in place, which is why an extension request without a payment of the expected balance solves only half of the problem.
Can late penalties be reduced or removed?
Sometimes. Relief for a first lapse is available to taxpayers with three years of timely compliance. That relief is moving from First Time Abate, which had to be requested, to Automatic Exemption from Penalty, which the IRS applies on its own when the original return finishes processing and which covers 2025 tax year returns onward. Separately, the IRS can abate failure-to-file and failure-to-pay penalties where the taxpayer shows reasonable cause and that the failure was not due to willful neglect. Making a good-faith payment as soon as possible helps support a reasonable-cause position. Interest is a different matter and is generally not abated.
Separate exceptions shift the deadlines themselves rather than forgiving a penalty: members of the Armed Forces serving in a combat zone or contingency operation, citizens and resident aliens working abroad, and taxpayers in areas covered by a declared disaster. And the IRS makes a plain observation of its own — it is often possible to borrow the funds at a lower effective rate than the combined IRS penalty and interest charges, which turns the decision into arithmetic.
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Sources
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Mena Hemaia, CPA, CIA
Chief Executive Officer, Accountack — West Palm Beach, Florida
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