If I'm expecting a refund, do I need to pay anything by April 15 when filing an extension?

If you are truly expecting a refund, you generally do not need to send a payment with your extension. The key word is truly. An extension gives you more time to file, not more time to pay, but that only matters if you actually owe tax.

How the rule works:

• Form 4868 gives you an automatic 6-month extension to file, moving your filing deadline to October 15, 2026 for a 2025 return
• Any tax owed is still due by April 15, 2026
• If your withholding, estimated payments, and credits already cover your liability, there is no late-payment penalty because there is nothing left to pay

Why people still file an extension even if they expect a refund:

• A K-1, corrected 1099, or late brokerage statement has not arrived yet
• They want more time to check a backdoor Roth, crypto, or business return detail
• They are worried their "expected refund" could turn into balance due after one missing form is added

The real risk:

A lot of taxpayers say they are expecting a refund before they enter all income documents. If you later discover a 1099-INT, 1099-B, K-1, or side-income form that turns the refund into tax due, interest and late-payment penalties start from April 15. That is why many tax pros recommend sending a reasonable estimate if there is any doubt.

What if you miss the filing deadline and are due a refund?

There is usually no failure-to-file penalty if no tax is owed, but filing an extension is still smart protection when your numbers are incomplete. You also do not want to drift too long, because refunds generally expire if you wait more than 3 years to claim them.

Best practical rule:

• Certain refund: extension is optional, payment usually unnecessary
• Not certain: file the extension and send an estimated payment
• Already filed: you do not file an extension, you amend later if needed