Under the American Rescue Plan Act, the first $10,200 of unemployment income ($20,400 if married filing jointly) is exempt from federal tax if your modified adjusted gross income is less than $150,000. If you filed your 2020 return before ARPA was passed on March 11 and had MAGI less than the $150,000, you would be eligible to receive a refund of the federal taxes paid on that $10,200.
Depending on what state you live in, you may or may not have the same exclusion for state tax purposes.
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