Due to a recent law change, you can again now deduct 100% of the cost of your new or used truck or SUV with a gross vehicle weight rating of 6,001 lbs or more used for your self-employed business. To maximize the deduction, buy it near the end of the year to ensure it is very near 100% business-use. In order to avoid recapturing the large depreciation deduction in future years, be sure to maintain business-use of 50% or more of the vehicle for the first 5 years of ownership.