In order to claim a portion of your mortgage interest for your home office, you will need to select actual expenses and NOT the simplified deduction. The question after Business conducted in home office will ask you which method you would like to use to claim the home office deduction, because screens change based on entries, yours may be a few questions later, but If you select "I'll enter actual expenses spreadsheet style, you will be able to enter your mortgage interest. This will be prorated based on the percet of the home that is used for the home office. You cannot claim the entire interest amount, only the amount that is equal to the home office percent.
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