I am trying to split the income between me and my wife using form 8958, but when I try to adjust the tax withholding from the higher incomer, I am adding the difference in the subtraction adjustment, however, it only takes a negative value, but it seems to add that amount instead of subtracting it. For example, person A withheld 10k, person B withheld 2k, when I try to adjust person A's tax withheld amount from 10k to 6k, I can only input -4000 in the "Tax Withholding - Subtraction Adjustment", as it can only take a negative value. But turbotax thinks that person A's withholding is 14k, it seems to be subtracting whatever value is entered, but double negation resulted in addition.
