Overview — Instruction 941-X — Instructions for Form

To correct a previously filed Form 941, use Form 941-X to file either an adjusted employment tax return or a claim for refund or abatement. The adjustment process and the claim process are outlined below.

If you underreported the tax. If you underreported the tax on a previously filed Form 941, check the box on line 1 and pay any additional amount you owe by the time you file Form 941-X. For details on how to make a payment, see the instructions for line 27, later.

Example—You underreported employment taxes. On April 10, 2026, you discovered an error that results in additional tax on your 2025 second quarter Form 941. File Form 941-X by July 31, 2026, and pay the amount you owe by the time you file. See When Should You File Form 941-X , earlier. Don’t attach Form 941-X to your 2026 second quarter Form 941.

If you overreported the tax. If you overreported the tax on a previously filed Form 941, you may choose one of the following options.

Use the adjustment process. Check the box on line 1 to apply any credit (negative amount) from line 27 to Form 941 for the quarter during which you file Form 941-X.
Use the claim process. Check the box on line 2 to file a claim on Form 941-X requesting a refund or abatement of the amount shown on line 27.

To ensure that the IRS has enough time to process a credit for an overreporting tax adjustment in the quarter during which you file Form 941-X, you’re encouraged to file Form 941-X correcting the overreported tax amount in the first 2 months of a quarter. For example, if you discover an overreported tax amount in March, June, September, or December, you may want to file Form 941-X in the first 2 months of the next quarter. However, there must be 90 days remaining on the period of limitations when you file Form 941-X. See the Caution under Is There a Deadline for Filing Form 941-X , earlier. This should ensure that the IRS will have enough time to process Form 941-X so the credit will be posted before you file Form 941, thus avoiding an erroneous balance due notice from the IRS. See the example below.

Example—You want your overreported tax applied as a credit to Form 941. On September 14, 2026, you discover you overreported your tax on your 2025 fourth quarter Form 941 and want to choose the adjustment process. To allow the IRS enough time to process the credit, you file Form 941-X on October 5, 2026, and take the credit on your fourth quarter 2026 Form 941.

Tip: If you currently file Form 944 and you’re making a correction to a previously filed Form 941 that will be claimed as a credit on Form 944, file Form 941-X before December in any year before the expiration of the period of limitations for the previously filed Form 941. In the year that the period of limitations for the previously filed Form 941 expires, file Form 941-X at least 90 days before the expiration date.