Can I wait to file amended return, if I know I will need to amend again?

Hello all! I have to amend my 2020 return because I had excess Roth IRA contributions. I received my 1099-R's this year, which included gains, resulting in my AGI increasing, resulting in my having to take MORE contributions out of my Roth IRA (thus, requiring another 1099-R). I know how much I need to pay in federal taxes (state is a refund due to other corrections).

 

Can I pay the additional federal taxes I now owe for 2020 via IRS online payment, have the second excess contribution withdrawn from my account, and file only one amended return next year, or do I have to file this first amended return, with payment, then withdraw the additional excess contributions, and file a second amended return?

 

One issue I see with this is Turbotax Online will not allow me to add an additional payment with a payment date past 12/31/2021.