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As per this article from the IRS, you can deduct expenses for keeping up and running your entire home, but that assumes your office is in the home. One would assume this is because you can't operate the office without the house it sits in. The article also says that you can't deduct expenses for the parts of your home not used for business. I can't interpret this for you, I can only mention that the IRS could argue that the house is not used for business, so they could deny the utilities that only service the house.