Q: will I also mention federal and state tax withheld amount in 2020 return?
No, only report the earnings on your 2020 amended tax return to pay tax and penalty on the earnings part.
Q: Or will I mention Federal and State tax withheld amount in 2021 return only since it was withheld in 2021?
Yes, you only mention Federal and State taxes withheld amounts in your 2021 tax return ONLY since the withholdings took place in 2021 and only impact your 2021 taxes.
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