If you had unemployment benefits on your return then if your modified adjusted gross income (AGI) is less than $150,000, then you can exclude up to $10,200 of unemployment compensation paid in 2020 from your taxable income. Amounts over $10,200 for each individual are still taxable.
If this is the case and you did not have any other changes on your return, then you do not have to file an amended return.
"If you have already filed your 2020 Form 1040 or 1040-SR, there is no need to file an amended return (Form 1040-X) to figure the amount of unemployment compensation to exclude. The IRS will refigure your taxes using the excluded unemployment compensation amount and adjust your account accordingly. The IRS will send any refund amount directly to you." (IRS)
If you did not have unemployment then you will have to file an amended return to claim the additional refund. Please review everything carefully. You can e-file your 2020 amended federal tax return, but most states require amendments to be printed and filed by mail. Please see FAQ How to amend a tax return for instructions.
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