What to Do If You Find a Payroll Error After Year-End Close

The year is locked, W-2s are out, and then someone spots it: a bonus that was coded wrong, a deduction that never got applied, an employee whose Social Security number was transposed. Finding a payroll error after year-end close feels worse than finding it in October, but the fix is still knowable and still doable. Here’s what actually happens next.

For everything that prevents this in the first place, see the Year-End Payroll Checklist, part of the Year-End Payroll and Tax Season Guide.

First, confirm what actually happened before filing anything

Not every discrepancy is a real error. Before filing a correction, verify the issue against the underlying pay records: was the wrong amount actually paid, or does the W-2 correctly reflect what was paid and the employee is just confused about the number (the most common cause, see our guide on explaining W-2 boxes to employees)? Filing a W-2c for something that wasn’t actually wrong creates its own confusion.

If it’s a wage or withholding error: file a W-2c

A genuine error in wages, tax withheld, or identifying information (legal name, Social Security number) requires a corrected W-2c filed with the Social Security Administration, along with a corrected copy sent to the employee. Do this as soon as the error is confirmed. The longer it sits, the more likely the employee has already filed their own return using the incorrect original.

If the employee already filed their taxes with the wrong W-2

This is the harder version of the same problem. The employee may need to file an amended personal return (Form 1040-X) once they receive the W-2c. Be direct with them about this rather than downplaying it: a correction filing on your end doesn’t automatically fix their already-submitted return, and they’ll need to know that to act on it.

If it’s a 1099 instead of a W-2 error

Corrected 1099-NEC forms follow a similar principle: file the correction with the IRS and send the corrected copy to the contractor promptly. If the underlying issue was a misclassification, not just a data error, that’s a separate and more serious problem worth resolving with an employment attorney before deciding how to file the correction.

Then find out why it happened, not just what happened

A single correction is a fix. A pattern of corrections is a process problem. If this is the second or third year-end correction stemming from the same kind of data gap, benefits deductions, tax elections, address updates, that’s worth addressing at the process level before the next year-end, not just correcting again after the fact.

Frequently Asked Questions

This article is for general informational purposes only and is not legal, tax, or accounting advice. Consult a qualified tax professional for guidance specific to your situation.

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