When you rent a room in your home, you have to apportion the common expenses such as mortgage interest and property taxes between the personal use and the business use (rental). One common method of determining the business use percentage is to divide the square footage of the rented area by the total square footage of your home.
The business use portion is deducted as an expense in the rental section and the personal use portion is claimed as an itemized deduction in Schedule A - Itemized deductions.
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