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Yes, enter only the square footage that you occupy under the Home Office topic. Likewise, any expenses shared with the rental space should be reported at 50% for the Home Office.
Complete the Rental Property section, including property taxes and mortgage interest, before you work on the Home Office topic. TurboTax will allocate the correct personal percentage to your itemized deductions and should present that amount to be allocated to your Home Office.
Be sure to review Form 8829, specifically Lines 10 & 11, to confirm that you are claiming the correctly allocated amount of mortgage interest and real estate taxes for the Home Office Deduction.
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