The program only uses line 8b with seller financed loans, as you are aware. Line 8a holds the actual 1098 and "none of the above". Which leaves two options for your son.
1. Select none of the above, the mortgage interest goes to line 8a. The IRS may someday inquire about the interest and you provide the amortization schedule or whatever proof you have.
2. Switch to the desktop version, go into forms mode and input the mortgage interest directly on line 8b. This voids the accuracy guarantee of the program. See How do I switch from TurboTax Online to the TurboTax software?
@13153
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
