IRS Admits to Tax Form Error That Could Force Some Workers To Refile - Here's What to Check

Late in this year's tax filing season, the Internal Revenue Service acknowledged an issue that could affect how some workers reported income.

Certain employees received incorrect W-2 forms due to a miscalculation tied to overtime wages. The error was traced back to the National Finance Center, a government-run payroll system that processes pay for multiple federal agencies.

For many taxpayers, the impact may be minimal. For others, it could mean taking a second look at their return, or even filing an amendment, to keep more of what they earn.

What went wrong with the W-2s

The issue centers on how overtime pay was reported under a relatively new tax rule. As part of the One Big Beautiful Bill Act, certain overtime earnings became partially deductible for tax years 2025 through 2028. Eligible workers can deduct up to $12,500 in qualifying overtime income, or $25,000 for joint filers.

The problem is that the National Finance Center underreported the portion of overtime that qualifies for this deduction on some W-2 forms. As a result, affected employees may not have been given an accurate figure to claim when filing their taxes.

Why this matters for your return

For taxpayers who claimed the overtime deduction, if the amount reported on your W-2 is incorrect, it could affect how much income you deducted and, ultimately, how much tax you owe or are refunded.

The IRS has said that in most cases, the difference will not significantly change a taxpayer's final bill. But even small discrepancies can matter, especially for workers who rely on precise reporting to stay compliant.

That concern is especially relevant for federal employees, who are held to stricter compliance standards and could face job-related consequences for filing errors.

The timing is a problem

The IRS notified affected employees late in the filing season. By the time the issue was flagged, many workers had already submitted their tax returns using the incorrect W-2 information.

That timing creates an extra step for those impacted. Instead of correcting the issue before filing, they may now need to go back and amend their return. The IRS has directed employees to file an amended return if the correction changes their tax outcome.

An amended tax return

If you need to fix your return, the process typically involves filing Form 1040-X. An amended return allows you to correct previously reported income, deductions, or credits. It can result in either an additional refund or a balance due, depending on the correction.

In many cases, the IRS expects the financial impact to be small. But the administrative step still matters, particularly for those who want their records to be accurate.

W-2 reporting tax headache

This is not the first time W-2 reporting has caused confusion this tax season. Earlier in January, the IRS flagged a separate issue involving payroll period calculations, which also affected how income was reported for some workers.

Combined with the rollout of new tax provisions like the overtime deduction, these errors highlight how complex changes to the tax code can lead to reporting challenges.

In some cases, payroll systems and withholding tables were not fully updated when the new law took effect, creating mismatches between what workers earned and what was reported.

The overtime deduction

Even if you are not a federal employee, the situation is a useful reminder. The overtime deduction is new, and not all employers or payroll systems may have handled it perfectly in its first year.

It's worth taking a closer look at your documents if you claimed the deduction. Errors are not necessarily widespread, but they are possible, especially when new rules are introduced quickly.

What you should check right now

If you claimed the overtime deduction on your return, it's worth reviewing your W-2 alongside your pay records. Make sure the overtime portion of your income is reported correctly and matches what you actually earned. If something looks off, you may want to confirm the numbers with your employer.

If you already filed and later discover an error, you still have options. Filing an amended return allows you to correct the issue, and in many cases, penalties can be waived if the mistake originated with the employer or a government system rather than the taxpayer.

Where to get help

The IRS has pointed affected employees toward Volunteer Income Tax Assistance (VITA) programs, which offer free help for eligible taxpayers. In some cases, managers at affected agencies have also been instructed to allow time during work hours for employees to address the issue.

Non-federal workers can turn to tax software providers or preparers to determine whether an amendment is necessary.

Bottom line

The financial impact of the W-2 error may be small for most taxpayers, but it's a reminder to review your return carefully, especially when new tax rules are involved.

If you claimed the overtime deduction, taking a few minutes to double-check your numbers now could help you avoid a more complicated fix later and lower your financial stress.

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