Do I need to file amendment for the unemployment tax break

[Barnett69]

Do I file amendment to get the unemployment tax break

[Critter-3]

If you filed before the $10,200 unemployment exclusion, the IRS will recalculate your return for you. There is no need for taxpayers to file an amended return unless the calculations make the taxpayer newly eligible for additional federal credits and deductions not already included on the original tax return.

See this new IRS announcement May 14, 2021
https://www.irs.gov/newsroom/irs-begins-correcting-tax-returns-for-unemployment-compensation-income-...

You may need to amend your state return
https://ttlc.intuit.com/community/state-taxes/help/do-i-need-to-amend-my-state-return/00/2134732

You can log back in or open your return and it should automatically update your return and show you the new refund. But the updated return won't be sent. The IRS will adjust it for you. You may need to update the Desktop program for it.