If the loan is a "secured loan" that qualifies for interest deduction, the lender will send you a 1098 to you, reporting that interest. If you don't have a 1098 (or equivalent) from the lender, the interest is not deductible. If you "did" receive something reporting the interest to you, that was not a 1098, then check the document. You're looking for phrases like "substitute 1098" or "in lieu of a 1098". Interest reporting documents with either of those phrases on it, indicates that you can deduct the interest reported on said document.
If your loan qualifies per the above, enter in the following area:
- Click on Federal Taxes (Personal using Home and Business)
- Click on Deductions and Credits
- Click on I'll choose what I work on (if shown)
- Under Your Home
- On Mortgage Interest, click on the start or update button