After you file

Thank you! This is all actually incredibly helpful!

 

I've tried amending last year's return with TurboTax, but it won't let me access the actual forms to enter the numbers from the IRS calculations. Is there any way to work around that? 

 

(I got the notice CP11 because the IRS claimed there was an error and I can only take a charitable donation deduction of 60%, not 100% - which I believe is some sort of error. So TurboTax just gives me the same numbers as before.)