Get your taxes done using TurboTax

This is in the 2020 Refund Applied to 2021 section

I clicked on 2020 refund applied to 2021 federal taxes.

It then asks me how much of my 2020 federal refund I applied to 2021 federal taxes. 

The next screen is Amount of Extension Payment Made for 2020.  The amount is already populated.  See screen shot :