This car is used by all 3 of us not only for our self-employment activities but for all our personal activities too. How do you determine what part of your gas & other expenses goes for your self-employment activity? For my husband & I, we use the standard mileage deduction since we track those miles. According to things we've read, if your spouse is the owner but allows you to use the car for self-employment mileage, you can claim it. Why would she be any different?
