If you buy a new or used truck or SUV at the end of the year and claim 100% business-use (by, for example, purchasing it on December 31st and driving it from the dealership to Office Depot to purchase paper for your business and then leaving it in the Office Depot parking lot until January 1st), then you can write off 100% of the cost of the vehicle in the year that you buy it even though you are likely never going to use that vehicle very often for business again. If you buy the same vehicle mid-year and use it 5% for your business, then your deduction would be 5% of the cost of the vehicle. This strategy works best if the vehicle is titled in the name of the business, but that isn’t absolutely necessary.