You can deduct interest on a timeshare if it is deeded and recorded in public records and it meets all the requirements for deducting mortgage interest.
You can claim Mortgage interest on a maximum of two homes (main home and a second home)
For more information please check: Can I deduct the mortgage interest on a timeshare?
To enter form 1098 form on your return:
- Login to your account.
- Select Federal from the left menu.
- Go to Deductions and Credits.
- Select Your Home and scroll down to Mortgage Interest, Refinancing and Insurance.