@ronroberts
1) pay the estimated taxes by January 15, 2024.
2) if it turns out you have a underpayment tax penalty, complet form 2210 and be sure to check PART II BOX C.
then you have the arduous take of completing your taxes on the form for each quarter of the year so prove that that you actually did not under estimate the payment for the first three quarters, but rather had this large income lump in the 4th quarter, which you duly paid by January 15, 20024.
