Which payroll records do you have to keep, and what do you do when a filed Form 941 turns out to be wrong?

Summary

Federal employment tax records have to be kept for at least four years after you file the fourth-quarter return for the year, while wage-and-hour records have their own three-year and two-year rules. A mistake on a filed Form 941 is fixed with Form 941-X, one for each return being corrected. If you underpaid, filing the 941-X by the due date for the quarter in which you found the error, and paying at the same time, generally keeps the correction free of interest and penalties.

Two retention clocks

The IRS rule covers taxes: "Keep all records of employment taxes for at least four years after filing the 4th quarter for the year." Its list includes your EIN, the amounts and dates of wage payments, employees' names, addresses, Social Security numbers and occupations, dates of employment, copies of W-4s, the dates and amounts of tax deposits with EFTPS acknowledgment numbers, and copies of filed returns with confirmation numbers.

The Department of Labor rule covers wages and hours under the Fair Labor Standards Act. For each nonexempt worker, a covered employer keeps 14 items, among them:

full name and Social Security number, address, and occupation
when the workweek begins, hours worked each day, and total hours each workweek
the basis of pay, the regular hourly rate, and total overtime earnings
every addition to or deduction from wages, total wages each pay period, and the payment date

Payroll records must be kept for at least three years. Time cards, wage rate tables, and the other records wage computations are based on are kept for two. The DOL "requires no particular form," so your payroll software's data counts, but both obligations sit with the employer, not with the software company.

Correcting a filed Form 941

The April 2026 instructions for Form 941-X set out the process. You file a separate 941-X for each Form 941 you are correcting, and you generally do not file it together with a regular 941. It can be e-filed.

When the original return underreported tax, the 941-X is due by the due date of the return for the period in which you discovered the error, and you pay what you owe by the time you file. Find the mistake in May and the deadline is July 31. Done that way, the IRS says, the correction is generally interest free and not subject to failure-to-pay or failure-to-deposit penalties. For overreported tax, you can choose an interest-free adjustment or a claim for refund or abatement.

There is also an outer limit. Underreported tax can be corrected within three years of the date the Form 941 was filed; overreported tax within three years of filing or two years of payment, whichever is later. A 941 filed before April 15 of the following year is treated as filed on that April 15. A first-quarter 2026 return filed on April 30, 2026 therefore counts as filed April 15, 2027, and stays open to correction until April 15, 2030. The IRS's four-year retention rule covers that whole window.

Two limits trip people up. Federal income tax withholding errors can generally be corrected only if you discover them in the same calendar year you paid the wages; for earlier years, only administrative errors can be fixed. And a 941-X does nothing to the W-2s already sent. Those are corrected on Form W-2c, which goes both to the Social Security Administration and to the employee, and can be filed online through the SSA's Business Services Online.

Sources

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Published September 27, 2026. The figures above come from the government and vendor pages listed under Sources.

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