You will only deduct a percentage of the utilities for your home as an expense of the home office. The percentage is based on the square feet of the home office versus the square feet of the whole house. For example, if the home office is 100 square feet and the whole home is 1000 square feet, then 10% of the utilities may be included as a home office expense.
When you are entering this information into TurboTax and you choose to use the actual expense method to claim your home office (instead of the simplified method), pay close attention to the messages on the screen to see if the program is asking you to enter the total expenses for the whole house or just the percentage for the home office. There will be categories for both in case you had some specific expenses that related only to the home office and not the whole house.
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