If you rent part of your property, you must divide certain expenses between the part of the property used for rental purposes and the part of the property used for personal purposes, as though you actually had two separate pieces of property.

You can deduct the expenses related to the part of the property used for rental purposes, such as home mortgage interest and real estate taxes, as rental expenses. You can deduct the expenses for the part of the property used for personal purposes, subject to certain limitations, only if you itemize your deductions on Schedule A (Form 1040). You can also deduct as a rental expense a part of other expenses that normally are nondeductible personal expenses, such as expenses for electricity, or painting the outside of your house. You cannot deduct any part of the cost of a single phone line even if your tenants have unlimited use of it.

You do not have to divide the expenses that belong only to the rental part of your property. For example, if you paint a room that you rent, or if you pay premiums for liability insurance in connection with renting a room in your home, your entire cost is a rental expense. If you install a second phone line strictly for your tenant's use, all of the cost of the second line is deductible as a rental expense. You can deduct depreciation, discussed later, on the part of the property used for rental purposes as well as on the furniture and equipment you use for rental purposes.

How to divide expenses. If an expense is for both rental use and personal use, such as mortgage interest or heat for the entire house, you must divide the expense between rental use and personal use. You can use any reasonable method for dividing the expense. It may be reasonable to divide the cost of some items (for example, water) based on the number of people using them. However, the two most common methods for dividing an expense are one based on the number of rooms in your home and one based on the square footage of your home.

Example. You rent a room in your house. The room is 12 x 15 feet, or 180 square feet. Your entire house has 1,800 square feet of floor space. You can deduct as a rental expense 10% of any expense that must be divided between rental use and personal use. If your heating bill for the year for the entire house was $600, $60 ($600 x 10%) is a rental expense. The balance, $540, is a personal expense that you cannot deduct.

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