Owe the IRS Money You Can’t Pay? Filing Anyway Cuts the Penalty From 5% a Month to 0.5%. The Return Nobody Files Because They Can’t Pay Is the One That Costs Ten Times More
Most people skip filing when they can't pay, assuming it buys them time, but the tax code treats that choice as the most expensive mistake on the calendar. The penalty math behind a missing return will surprise you.
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October 15, 2026 is the last day to file a 2025 federal return on extension. Picture a retiree looking at a balance due she can’t cover, who decides to hold the paperwork until the money shows up. It feels like the responsible move, and the tax code charges more for it than for almost any other calendar mistake.
Section 6651 of the Internal Revenue Code sets two separate penalties: one for not filing and one for not paying. The filing penalty is 5% a month. The payment penalty is 0.5% a month. If you file the return with no check attached, the expensive penalty never starts.
Two Penalties Hide in One Code Section
The failure-to-file penalty adds 5% of the unpaid tax for each month or part of a month the return is late, capped at 25%. The failure-to-pay penalty adds 0.5% per month and has the same 25% cap.
When both penalties hit in the same month, the IRS subtracts the payment penalty from the filing penalty. You still pay 5% a month in total, split as 4.5% for not filing and 0.5% for not paying. After five months the filing penalty reaches its cap. The payment penalty keeps running.
Returns filed more than 60 days late also face a minimum penalty: an inflation-adjusted dollar floor or 100% of the tax owed, whichever is smaller. The statute sets the base floor at $435, and it rises with inflation each year. For returns due in 2026, it’s $525. For a small balance, that floor can wipe out the whole amount owed.
A $10,000 Balance Shows the Ten-to-One Gap
Take an illustrative composite: a 66-year-old who took a large IRA distribution in 2025, filed an extension, and owes $10,000 with no way to pay it soon. An extension moves only the filing deadline. Her payment deadline stayed at April 15, so the 0.5% penalty has been running since spring either way. The choice she still controls is what happens after October 15.
| Months after Oct. 15 deadline | Files on time, pays nothing | Skips filing, pays nothing |
|---|---|---|
| 5 months | $250 | $2,500 |
| 12 months | $600 | $2,850 |
| 12 months on a payment plan | $300 | Not available until she files |
After five months, skipping the return has cost her $2,500 in penalties. Filing it would have cost $250. That’s the headline’s ten-to-one ratio in actual dollars.
Both columns also accrue interest on the tax and on the penalties. The rate is the federal short-term rate plus 3 percentage points, compounded daily and reset every quarter. Rates are still elevated: the Federal Reserve’s target range tops out at 4.00% as of October 6, 2026.
Filing Without Paying Opens Three Cheaper Exits
A filed return gives you options that a missing return doesn’t.
- Set up a payment plan. If you filed on time, the failure-to-pay penalty falls to 0.25% a month while an installment agreement is in place. You can apply online or with Form 9465.
- Ask for first-time abatement. If your record is clean for the prior three years, the IRS will often remove filing and payment penalties on request. You have to be fully filed first.
- Claim reasonable cause. Both penalties in Section 6651 allow relief when the failure came from reasonable cause and not willful neglect, such as serious illness or a disaster.
Paying with a credit card makes sense less often than you’d think. The average card APR is 20.94%, and paying the IRS by card adds a processing fee. The 0.5% monthly penalty plus IRS interest usually costs less than carrying that balance.
Ignoring IRS Notices Doubles the Payment Penalty
The cheap rate has a limit. The payment penalty rises to 1% a month starting 10 days after the IRS sends a notice of intent to levy. Answering IRS letters, even with a payment plan request, keeps you at the lower rate.
If you’re owed a refund, there’s no late-filing penalty because no tax is unpaid. You do lose the refund if you don’t claim it within three years.
Biggest Mistake Costs Ten Times More Per Month
The most common error comes from treating the filing deadline and the payment deadline as one deadline. They’re separate, and missing the filing deadline costs about ten times as much per month. File by October 15 even if you send nothing, then work out a payment plan.
If a large IRA distribution or a business sale caused the balance, sit down with a CPA to plan withholding and estimated payments so next year doesn’t end up here too. Big pre-tax balances tend to produce surprise bills like this one once withdrawals start, which is the whole subject of our free guide to defusing the first-year tax bomb.
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Vilma Rios is a tax professional and tax content contributor with more than 15 years of experience in tax and accounting. She specializes in federal tax research, tax education, and translating complex tax rules into clear, practical information for individuals, families, and small-business owners.
Vilma is a Content Tax Contributor II with the National Association of Tax Professionals (NATP), where she contributes to tax education and professional content. She has also presented tax information through webinars, including Spanish-language tax education, and has appeared on Telemundo 47 discussing tax topics and helping viewers understand important tax-filing requirements.
Her experience also includes tax and accounting work, tax research, IRS-related matters, and public tax education. While in college, Vilma volunteered in an IRS-sponsored tax assistance program and was recognized for her community service by local and state officials.
Known as “Your Tax Geek,” Vilma is passionate about making taxes easier to understand and helping people navigate an increasingly complex tax system.
