I filed my 2020 taxes and it is pending. I received a 1099R in the mail today. Is there any way I can add it to my pending return?

[MinhT1]

If you have already filed your return, you'll need to wait for your tax return to either be rejected or accepted, if it is rejected you can add your Form 1099-R, correct any other errors on the return and resubmit it.

If it is accepted, you will need to amend your return to include the Form 1099-R. 

Please be aware that Form 1040X will not be available in TurboTax until February 18, 2021, but once it is available, you will be able to prepare and e-file your amended return.

Please see this TurboTax FAQ for instructions on how to amend your tax return in TurboTax.