If you purchase a used pickup truck or even a used utility
truck for commercial usage, it is going to be deductible under Section
179 (Source: Used Utility Truck by Hengehold Trucks).
You will be able to take the full purchase price of the truck and
deduct it from your taxes. It is important to note, however, there is
another consideration which is known as bonus depreciation. This is only
going to be allowable on new equipment, including new vehicles. If you
are a large business and spend $560,000 or more annually on capital
equipment, you may be able to take advantage of the bonus depreciation
on new vehicles that are purchased. You will not be able to use it on
used vehicles.
There are always considerations when purchasing anything
for your business. Talk to your accountant before making your purchase
to determine if it is going to be to your financial benefit to purchase
something that is used. You will likely find that it will be beneficial.