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Filing deadlines

What Happens If I Miss the April 15 Tax Deadline?

Missing the filing deadline is not the same as failing to pay. The penalties are different, the fix is straightforward, and filing late is almost always better than not filing at all.

Written by Matt Reese, CPA · 5 min read · Published April 2026·Share on LinkedIn

Key Takeaways

  • A filing extension (Form 4868) is free, automatic, and gives you until October 15. You don't need a reason to ask for one.
  • An extension gives you more time to FILE — not more time to PAY. If you owe money, it was due April 15 regardless.
  • The failure-to-file penalty (5%/month up to 25%) is ten times worse than the failure-to-pay penalty (0.5%/month up to 25%). Always file, even if you can't pay.
  • If you expect a refund, there's no penalty for filing late — the IRS is holding your money, not the other way around.
  • If you genuinely can't pay, the IRS has payment plans. An installment agreement stops the escalation even if it doesn't stop the interest.

The most important thing to understand first

There are two separate deadlines that people often confuse:

  • The filing deadline — when you have to submit your return. April 15 for most individuals (March 15 for S-corps and partnerships).
  • The payment deadline — when any tax you owe has to be paid. Also April 15, regardless of whether you file an extension.

A filing extension extends the first deadline, not the second. This is the thing that trips people up every year. They file an extension, breathe a sigh of relief, don’t pay, and then get surprised by a penalty in October.

What the penalties actually look like

There are two distinct penalties: one for not filing, and one for not paying. They stack, and the filing one is much worse.

Failure to file:5% of the unpaid tax per month (or partial month), up to a maximum of 25%. If you owe $10,000 and wait 5 months to file without an extension, that’s a $2,500 penalty — just for not filing.

Failure to pay: 0.5% of the unpaid tax per month, up to 25%. On that same $10,000, five months of failure-to-pay penalties = $250.

Both penalties apply in the same month if you’re both late filing and late paying — but the failure-to-file penalty is reduced to 4.5% when both apply simultaneously, so the total is 5% per month. Plus interest on the unpaid tax at the federal short-term rate + 3%.

The math is clear: file something, even if you can’t pay. The failure-to-file penalty is ten times the failure-to-pay penalty. Filing stops the bigger clock immediately.

Always file, even if you can't pay

The worst thing you can do is both fail to file and fail to pay. File the return or an extension by April 15 regardless of whether you can pay. That eliminates the 5%/month filing penalty. Then address the payment separately — the 0.5%/month penalty and interest are manageable compared to 25% in filing penalties alone.

If you haven’t filed yet: what to do right now

  1. Before April 15: file an extension.Form 4868 for individuals, 7004 for most business entities. File it electronically through any tax software — it’s free. You’ll get until October 15. Estimate what you owe and pay it with the extension if you can.
  2. After April 15, no extension filed: file immediately.Every month you wait adds another 5% to your failure-to-file penalty. File the return as soon as possible, even if it’s not perfect. You can always amend later.
  3. Can’t pay the full amount: pay what you can. A partial payment reduces the penalty and interest base. Then set up a payment plan.
  4. Can’t pay anything: still file. Then call the IRS (1-800-829-1040) or go to IRS.gov to set up an installment agreement.

Filing the extension: step by step

For individuals (Form 4868):

  1. Go to any major tax software: TurboTax, H&R Block, FreeTaxUSA (free). Search for “extension” or “Form 4868.”
  2. Enter your name, SSN, and address.
  3. Estimate your tax liability for the year and how much you’ve already paid (through withholding or estimated payments).
  4. Pay the estimated balance due if you can — you can pay directly through the software or at IRS Direct Pay (IRS.gov/payments).
  5. Submit before midnight April 15.

You’ll get a confirmation number. Keep it. You now have until October 15.

If you expect a refund, there's no penalty

Late filing penalties only apply when you owe money. If you’re expecting a refund, filing late doesn’t cost you anything extra — the IRS is holding your money, not the other way around. You have three years from the original due date to claim a refund before it expires. But file anyway — why leave your money with the IRS longer than necessary?

Payment plans if you can’t pay

The IRS would rather collect something over time than nothing. Their installment agreement program lets you pay over up to 72 months.

  • Online payment agreement:Set one up at IRS.gov/paymentplan. If you owe under $50,000, it’s streamlined — no financials required, takes about 10 minutes. There’s a small setup fee ($31 if you pay by direct debit).
  • What it does:Stops the escalation. You’ll still owe the failure-to-pay penalty and interest until the balance is paid in full, but it prevents the IRS from pursuing more aggressive collection (levies, liens).
  • What it doesn’t do:Make the interest or penalties go away. Those continue to accumulate until you’re paid off. Paying as quickly as you can minimizes the total cost.

S-corps and partnerships: a different deadline

If you have an S-corp or partnership, the return deadlines are different — and earlier:

  • S-corp (Form 1120-S) and partnerships (Form 1065): March 15
  • Extension: Form 7004, pushes to September 15
  • Individual return (Form 1040): April 15 (October 15 with extension)

The S-corp return has to be filed before the individual return because the K-1 from the S-corp flows to the individual 1040. Missing the March 15 deadline for the business entity creates a late-filing penalty at the entity level ($235/month per shareholder or partner, up to 12 months). This is less common knowledge and catches business owners off guard.

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Frequently asked

Questions owners actually ask

How do I file a tax extension?
File Form 4868 (for individuals) by April 15. You can file it electronically through any major tax software (TurboTax, H&R Block, FreeTaxUSA) for free, or submit it on paper. The IRS doesn't require a reason — requesting an extension is automatic. You'll get until October 15 to file the complete return. Businesses (corporations, partnerships, S-corps) use different forms: 7004 for most business entities.
If I file an extension, when do I have to pay?
April 15, regardless of the extension. The extension moves your filing deadline — not your payment deadline. If you owe $5,000 and you file an extension but don't pay until October, you'll owe failure-to-pay penalties and interest on the $5,000 from April 15 to your payment date. Pay your best estimate of what you owe with the extension filing, even if it's not exact.
I missed April 15 and didn't file an extension. What do I do now?
File as soon as possible. Every day you wait makes the failure-to-file penalty larger (5% per month up to 25%). File the return even if you can't pay the full amount — it stops the filing penalty from accumulating. Then work out a payment plan for whatever you owe.
Can I be arrested for filing taxes late?
No. Late filing and failure to pay are civil tax violations, not criminal ones. Criminal charges (tax evasion, fraud) require intentional, willful behavior — actively hiding income, falsifying documents, that kind of thing. Simply forgetting to file or not having the money to pay is handled through penalties and interest, not prosecution.
What if I'm a business owner with S-corp or partnership returns?
Business entities have different deadlines. S-corps (Form 1120-S) and partnerships (Form 1065) are due March 15, not April 15 — a full month earlier than individual returns. Extensions for these use Form 7004 and push the deadline to September 15. Missing the March 15 deadline for an S-corp return is a common mistake that creates late-filing penalties at the entity level.

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Educational content only.This article is for informational purposes and does not constitute tax, legal, or investment advice. Every owner’s facts are different; consult a qualified CPA and advisor before acting. Tax and accounting services are provided through Matt Reese, CPA; investment advisory services are provided through Measured Risk Portfolios, a registered investment adviser. Matt Reese, CPA and Measured Risk Portfolios are separate entities; clients are not required to engage both.