You will need to amend the 2020 tax return that was filed to add the unemployment compensation and for the exclusion to be applied.

An amended return, Form 1040-X, can only be printed and mailed to the IRS if the original tax return was not e-filed. The IRS will take up to 16 weeks or longer to process an amended tax return.

Before starting to amend the tax return, wait for the tax refund to be received or the taxes due to be paid and processed by the IRS.

See this TurboTax support FAQ on amending a tax return originally completed and filed using the 2020 TurboTax editions - https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-return/01/27439

@cnreck 

Yes, since you did not report the 1099-G on your original return, you will need to amend your tax return and report that information.

Here is a link to help you get started with amending your return.

https://turbothttps://turbotax.intuit.com/tax-tips/amend-return/video-how-to-amend-your-tax-return/L...