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 on Schedule E (Form 1040). 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 the first 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 tenants' 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
the rental use and the 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.
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