@pkleeberg "On form 2210 part two, line 10, tax withheld smart worksheet, the first box for a calculated withholding for January one through April 15 remains red"
Are the amounts in those boxes correct? You said you retired mid-year, so your withholding reported on your W-2 should be attributed to the first two quarters. Did you check box D (withholding to be calculated as of date paid instead of equal installments) as well as box C?
I had a case a few years ago where my spouse was an employee for the first three months of the year only and my penalty didn't go away until I checked box D and entered the details of when the withholding was done.
