If you do not rent your property to make a profit, you can deduct your rental expenses only up to the amount of your rental income. You cannot carry forward to the next year any rental expenses that are more than your rental income for the year. For more information about the rules for an activity not engaged in for profit, see Not-for-Profit Activities in chapter 1 of Publication 535.
Report your not-for-profit rental income on Form 1040 or Form 1040NR, line 21. You can include your mortgage interest and any qualified mortgage insurance premiums (if you use the property as your main home or second home), real estate taxes, and casualty losses on the appropriate lines of Schedule A (Form 1040) if you itemize your deductions.
Claim your other rental expenses, subject to the rules explained in chapter 1 of Publication 535, as miscellaneous itemized deductions on line 23 of Schedule A (Form 1040). You can deduct these expenses only if they, together with certain other miscellaneous itemized deductions, total more than 2% of your adjusted gross income.
If your rental income is more than your rental expenses for at least 3 years out of a period of 5 consecutive years, you are presumed to be renting your property to make a profit. You may choose to postpone the decision of whether the rental is for profit by filing Form 5213.
See Publication 535 for more information.