If it's deductible, it goes
1. Deductions & Credits.
2. Your Home.
3. Mortgage Interest, Refinancing, and Insurance
This, from the IRS Publication 936, Home Mortgage Interest:
Time-sharing arrangements. You can treat a home you own under a time-sharing plan as a qualified home if it meets all the requirements. A time-sharing plan is an arrangement between two or more people that limits each person's interest in the home or right to use it to a certain part of the year.
Rental of time-share. If you rent out your time-share, it qualifies as a second home only if you also use it as a home during the year. See Second home rented out , earlier, for the use requirement. To know whether you meet that requirement, count your days of use and rental of the home only during the time you have a right to use it or to receive any benefits from the rental of it.
