@fanfare , the formula is fine (ignoring the newly mentioned $13,988 of basis). Multiply then divide.
@ab22txin , are you saying that you had $13,988 of basis in nondeductible traditional IRA contributions carried in line 14 of your most recently filed Form 8606 which carries forward to line 2 of your 2022 Form 8606? If so, you are correct that the taxable amount of the Roth conversion would be zero because your basis on line 3 of $19,988 exceeds the $17,954 that should be on line 9. However, if your basis exceeded your balance in traditional IRA, it makes little sense that you did not convert everything to Roth.
