@Farmgirl1231 wrote:
I mailed a paper return in mid-March 2021, but the "Where's My Refund" does not show that it was received. Do I wait until the IRS sends me a letter or should I mail a 2nd return? Or should I do something else?
Not a good idea. If you mail a 2nd return and there is already a return in the IRS system then the IRS will red flag both returns for human inspection which can delay things for up to a year.