I owe a substantial underpayment penalty on my 2021 return. But I also had a substantial refund on my 2020 return, which I had applied to my 2021 estimated taxes. Examining Form 2210, specifically line 11, I find that the refund was applied to the amount in Column B (6/15/2021). But the instructions for Form 2210 state "Any overpayment from your 2020 return applied to your 2021 estimated tax payments. Generally, treat the payment as made on April 15, 2021." And Turbotax will not allow me to override this to include the previous year refund to Column A rather than Column B.
