Guides

Apply Your Tax Overpayment to Next Year's Estimated Tax

Checked October 17, 2026 · Educational summary

General information, not tax, legal or financial advice. We are not the IRS. Check IRS.gov or a qualified tax professional. Sources read on October 17, 2026. Dates and amounts after 2026 are expected. Examples use made-up numbers. This page contains no affiliate links.

Pub. 505 says that if your Form 1040 for 2025 shows an overpayment, you can apply part or all of it to your 2026 estimated tax by entering the amount you want credited on the return instead of refunded. If you timely file your 2025 return, the credit is treated as a payment made on April 15, 2026. Take the credited amount into account when figuring your estimated payments.

The catch

Once you choose to credit an overpayment, you can't have it refunded until you file your tax return for the following year, and you can't use it in any other way. In the IRS example, a $750 overpayment was split: $600 credited to the 2026 estimated tax and $150 refunded. A September amended return showed $250 more tax owed, reducing the 2025 overpayment to $500; since the $750 had already been applied or refunded, the IRS billed the $250 plus penalties and interest, and the credited $600 couldn't be used to pay that bill.

How it fits the worksheet

On Worksheet 2-1, the first installment is one-quarter of the annual required payment minus any overpayment you are applying to that installment. Pub. 505 lists applying a prior-year overpayment as one of your options for paying estimated tax, along with paying everything by the first due date or in installments.

Made-up example

2025 return overpayment $2,000; you credit $1,200. Treated as paid April 15, 2026, it covers the first two installments of $600 if your annual requirement is $2,400 across four installments (our arithmetic). Remaining payments are due June 15, September 15, 2026 and January 15, 2027.

For 2026 overpayments

A 2026 overpayment can be credited to 2027 estimated tax under the same rule; the credit date would be April 15, 2027, which is expected (the 2027 edition of Pub. 505 wasn't available). April 15, 2027 is a Thursday.

Related

Do I need to pay? · How to pay

FAQ

Can I change my mind after filing?

The Pub. 505 text says you can't use the credited overpayment any other way; we found no exception.

What if I file late?

The "treated as paid April 15" rule is stated for timely filers only.

What we could not verify

  • Whether and how you can change the election after filing.
  • The exact Form 1040 line to use for the 2026 return (not stated in the section read).
  • The 2027 edition of Pub. 505 and the April 15, 2027 credit date.
  • Interest or penalty rules for the credited amount beyond the IRS example.

Sources