IRS has been running behind processing Amended Returns. My daughter's 2020 Amended Return was received by IRS on August 4, 2021 and was just processed on May 13, 2022. That is 40 weeks and 2 days! This is double the 20 weeks that IRS indicates. It also took well over the 3 weeks IRS indicates for it to show up as being received on the Where's My Amended Return website.
