You can use the square feet method where you consider the square footage of the room being rented versus the square footage of your whole house.
Or, you can use a method to show that one room was rented versus all of the rooms in your house. Using this method, you cannot include only the bedrooms, you must consider the whole house number of rooms.
To learn more, take a look at the information in IRS Publication 527 regarding dividing expenses when renting part of a property.
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