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IRS.gov Website
Publication 17
taxmap/pub17/p17-045.htm#en_us_publink1000171689

Renting Part of
Property(p70)

rule
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, qualified mortgage insurance premiums, and real estate taxes, as rental expenses on Schedule E (Form 1040). You can also deduct as rental expenses a portion of other expenses that normally are nondeductible personal expenses, such as expenses for electricity or painting the outside of your house.
There is no change in the types of expenses deductible for the personal-use part of your property. Generally, these expenses may be deducted only if you itemize your deductions on Schedule A (Form 1040).
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 house used for rental purposes as well as on the furniture and equipment you use for rental purposes.
taxmap/pub17/p17-045.htm#en_us_publink1000171691

How to divide expenses.(p70)

rule
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. The two most common methods for dividing an expense are based on (1) the number of rooms in your home, and (2) the square footage of your home.