Depreciation is essentially an allowance for "wear and tear." The wear and tear on your truck is a business expense that you can deduct. However, when you sell the truck, you may have a taxable event if you sell it for more than the depreciated value. For example, if the truck has a life of 5 years, and you sell it for $2000, 6 year from now, that $2000 is taxable income, even though it would not be if you sold a used personal vehicle. You deducted all the original value, now if you get more value by selling it, that becomes taxable.
Also, in the winter do you use it for work or personal use? That affects things. @JeffreyR77 can you return and address this issue? I know what to do if you use a personal vehicle in business, but not if you use a business vehicle personally. Maybe they are the same if this is an unincorporated sole proprietorship.
