Regardless if I efile with Turbotax or use USPS to mail my 2024 return on 4/15/25 & pay the underpayment penalty amount by using 4 equal quarters in part III of Form 2210 (Penalty Computation).
Can I later amend 2024 fed tax return to refigure underpayment penalty using annualized income installment method in Schedule AI of Form 2210 since a good portion of AGI occurred in 4th quarter?
