We don't know if you are owed back pay for any year.
- That is something for you to work out with your employer.
- It certainly would be worth asking the question.
From a tax point of view. You should not have to change the 2025 tax return that you filed in 2026.
- If you were paid back pay this year (2026) for work you did this year (2026) it will go on your tax return next year (filed in 2027)..
- The IRS taxes income in the year it is received.
- Payments paid in 2026 for work done in 2025 is also reported on your 2026 tax return (filed in 2027.
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