what is the nature of the investment interest - attributable to royalties, passive activity, nonpassive trade or business or investments? where did the investment interest get deducted? - schedule A, C, E, F.
it's possible that the investment interest ended up being allocated to more than one schedule. we can't see your tax return.
from 4952 instructions
Part III—Investment Interest Expense Deduction
Line 8
Individuals. Generally, enter the amount from line 8 on Schedule A even if all or part of it is attributable to a partnership or an S corporation. However, if any part of the interest expense is attributable to royalties, enter that part on Schedule E page 1. Also, if any part of the interest is attributable to a trade or business that isn’t a passive activity, enter that part on the schedule where you report other expenses for that trade or business.
