I filed an amended paper return for 2019 in January. I've been checking periodically on its status using the Where's my amended return tool? Up until today it showed it was "in process" on a bar chart. Today it gave me a message to call an 800 number with an extension number. I've repeated called and been on long holds.
My question is if I hadn't checked the status and tried to call, will the IRS eventually notify me by mail what it is they need for the amended return to be completed?
