Spook = correct There are common guidelines for depreciating vehicles. If you stick to those you should be right. The golden rule is, don't be too aggressive with depreciation schedules. Some people over-expense depreciation on their assets to reduce gross income and therefore pay less tax, which works in the short term while the asset is held. When the time comes to sell the asset, say at the end of 3 or 5 years, it can hurt. If you plan on holding the asset long term, say 10 or more years, and fully depreciate the asset over the first 5 years to minimize tax, say in a start up business, then you are a little safer as the sale value of a 10 year old car may only be a few thousand dollars. Personally I wouldn't recommend that avenue, nor would most good accountants.