Back in 2021, I filed my 2020 tax return using the IRS Free File Program delivered by TurboTax. However, recently, I received a W-2C from my old employer changing my Social Security Tax Withheld by increasing it by $1400.
I'm not allowed to amend my 2020 taxes due to using the IRS Free File Program delivered by TurboTax. Do I have to manually fill out a 1040-X somewhere else?
