This worked for me. 2020 it was 300.00 now it's 600.00. Turbotax has a bug that's putting in 300.00. As the instructions say you should enter 600.00 for tax year 2021. When the final check is run it catches the 300.00 as being wrong and asks you to change it. Just type in 600.00 if filing jointly and it will fix it.
