If you have a car that you used for business purposes you can deduct chauffeur's salary, garage rentals, gas, insurance, license fees, oil and lubrication, parking, repairs, tires, washing and other expenses related to the maintenance of that car.
If you sell that car and if you incur a loss on that sale (against the depreciated book value) you can deduct that loss on your business tax return (or your Schedule C if your a sole proprietor)
