No! "Your home office business deductions are based on either the percentage of your home used for the business or a simplified square footage calculation.
The most exact way to calculate the business percentage of your house is to measure the square footage devoted to your home office as a percentage of the total area of your home. If the office measures 150 square feet, for example, and the total area of the house is 1,200 square feet, your business percentage would be 12.5%."
Based on your scenario: The property tax deduction that you would apply for your home on Schedule A is 94% of the $14,887 total ($13,994). You can only deduct 6% of that total amount as a home office expense ($14,887 x 6% = $893). Thus, $13,994 + $893 is your total property tax.
You will make similar calculations for mortgage interest, utilities, etc. 94% to the home + 6% to the office = 100%.
The simplified option for calculation the home office deduction: The rate for the simplified square footage calculation is $5 per square foot, with a maximum of 300 square feet (or $1,500). E.g., if your wife's home office is only 150sq ft, then 150 x $5 = $750 total office deduction.
Please read this TurboTax Help article for more information: The Home Office Deduction
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