If you use the same car for multiple businesses, then you would allocate the expenses based on the percentage of use for each vehicle. So, if you have 3 businesses and you use the car 25% for one, 25% for the next and 50% for the last, and you paid $1,000 in interest during the year, you would claim $250 for the first, $250 for the second and $500 for the third.
This will keep it from counting an expense multiple times.
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