If you follow the order of entering information that TurboTax uses, you will enter your Schedule C and home office expenses before entering your Schedule A itemized deductions. This will allow the program to use proportional amount of the Whole Home expenses such as property tax as a Home Office expense. This calculation will be done in the Home Office section and the remaining 'personal' portion of the property tax will automatically be transferred to the Schedule A section of your return.
When you get to Schedule A, you will not enter the property tax again. Instead you will see messaging on the screen showing the amount that has been transferred from the Home Office section that is not being used as a Home Office expense.
So, enter this information into the Home Office section so that it can be taken into account, but be aware that if you already entered it in the Schedule A Itemized Deductions section that you may need to delete that entry so that it is not counted twice.
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