@Once a year Accountant
Yes, you use the 2021 TurboTax desktop program to amend the 2021 tax return.
No, the amended return cannot be e-filed it must be printed and mailed to the IRS.
If there are taxes owed on the amended return, you pay the taxes owed. After the taxes are paid the IRS will send you a bill in the mail for any penalties and interest.
