First I would manually prepare the 8990 to see if you get any additional deduction. If not, e-file without it and then file an amended return with it by mail. If yes, you have to decide among the following - all require filing an amended return by mail:
1) take the deduction and include the manual 8990
2) don't take the deduction and e-file without the 8990, then amend including the 8990.
3) take the deduction and e-file without the 8990. then amend to include the 8990. This could delay any refund you are due
maybe Turbotax will do something for 2025.
