Have you been using the vehicle for business and taking expenses (mileage method or actual expense method)?
If yes, we need more details. The sale may result in taxable business income to you.
If no, then there are no income tax consequences any way around.
In either case, check with your state DMV regarding sales and use tax. When the new owner registers a vehicle in their own name, many states will charge sales tax based on the selling price or on the book value of the vehicle. Often there are exemptions if the buyer and seller are family members. Check your state rules to make sure you understand what taxes might be owed and how to avoid or minimize them if you can.
