After you file

The IRS will recalculate the taxes due based on the unemployment compensation exclusion, starting in May, and send you a refund, if eligible.  There is no need to file an amended return for the exclusion.

Go to this IRS website for information - https://www.irs.gov/newsroom/irs-to-recalculate-taxes-on-unemployment-benefits-refunds-to-start-in-m...