I believe you are thinking of the Section 179 deduction. It started out as a $100,000 tax deduction. It was later reduced to only about $25,000 if I remember right. You have to have had a small business and the truck must have been used at least 50% of the time for legitimate business reasons. The mileage for each trip must be documented. Talk to your accountant/CPA for clarification. In my case, I worked for another company most of the year. I then started my company at the end of the year. I bought the truck in June, and used it about 56% of the time for business. It may still work out better in the long run to do a normal depreciation and use the actual expense method to determine your taxes instead of using the standard mileage deduction.