I'm thinking of changing primary residence and converting my current one to run a business. The house needs a lot of work so I'm wondering if I can do the repairs and deduct them as a business expense? Obviously thinks that don't make sense such as laundry or shower would be left out of the deductions. What happens if a year later I move the business elsewhere and flip the house as a residence? I've lived there more than two years so expect not to pay capital gains tax. I understand this is perfectly legal for landlords/flippers to do, but the business in question would be more online sales type.