The calculation seems incorrect for those MFJ over 150k. With both spouses over 65. In TurboTax it took the total combined of both spouses and subtracted 150k = (a) . Took 6% of that (a) number = (b). It then took 6000 -b to get c. It multiplied c times 2 to get additional deduction. Shouldn’t it take b from 12,000? It is using combined income of both spouses should it not reduce from 12000? Thanks
