You’ve probably seen or heard ads urging you to donate your car to charity. “Make a difference and receive tax savings,” one organization states. But donating a vehicle may not result in a big tax deduction — or any deduction at all. Donating your vehicle, trading it in, or selling it? Let’s say you’re buying a new car and want to get rid of your old one. Among your options are trading in the vehicle to the dealer, selling it yourself or donating it to charity. If you donate, the tax deduction depends on whether you itemize and what the charity does with the vehicle. For cars worth more than $500, the deduction is the amount for which the charity actually sells the car, if it sells without...