Yes, if you are taking a deduction for a home home office and are using actual expenses (such as real estate taxes, mortgage, insurance, utilities, etc.), you would compare the size of your home office to your entire house in order to get the correct percentage. For example, if your house is 1,000 sq feet, and your home office is 100 sq feet, then your home office is 10% of your entire house. Therefore, allocate 10% of your real estate taxes, mortgage, insurance, utilities, etc. to the home office.
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