If I file a tax extension for 2025, do I still owe money by April 15, 2026?

Yes — a tax extension gives you more time to FILE your return, but it does NOT give you more time to PAY any taxes owed. Payment is still due April 15, 2026.

How the extension works:

Filing Form 4868 by April 15, 2026 automatically extends your filing deadline from April 15 to October 15, 2026. No explanation required — it's automatic when you file the form. You can file it electronically through IRS Free File, your tax software, or by mailing a paper Form 4868.

The critical catch:

If you owe taxes, you must estimate your liability and pay that amount by April 15. The extension only delays your paperwork — not the payment. If you don't pay by April 15:

• Failure-to-pay penalty: 0.5% of the unpaid amount per month (up to 25%)
• Interest: Currently accruing at the federal short-term rate + 3% (check IRS.gov for the current rate)

What if you overpaid via withholding?

If you expect a refund (meaning you've already paid more than you owe through withholding or estimated payments), you don't need to pay anything by April 15. The extension simply gives you until October 15 to file and claim your refund. Note: you generally have 3 years from the original due date to claim a refund.

Good reasons to file an extension:

• Still waiting on a K-1 from a partnership, S-corp, or trust
• Had a complex financial event (sold a business, exercised options)
• Life circumstances (illness, major life change)
• Need more time to gather documentation for deductions

Common misconception:

Many people think filing an extension triggers an audit. It does not. The IRS routinely grants extensions and there is no evidence they increase audit risk.

How to estimate what you owe:

Use last year's return as a starting point. Adjust for any significant income changes. It's better to slightly overpay (you'll get a refund later) than to underpay and owe penalties.