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In general, a home office deduction is allowed if the home office meets at least one of three criteria: 1) the home office is the principal place of business; 2) the home office is the place where the business owner meets with clients and customers as part of the normal business day; or 3) the place of business is a separate structure on the property, but is not attached to the house or residence. The deduction is figured on the size of the home office as a percentage of the total house or residence. For example, if the total house size is 2,400 square feet and the home office is 240 square feet, 10 percent of the total house is considered used for business. That would allow the business owner to deduct 10 percent of the household's costs for electricity, real estate taxes, mortgage interest, insurance, repairs, etc. as business expenses.