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If the vehicle is used 100% for business purposes, you can take a direct write-off of up to $25,000 for a vehicle with a GVW over 6000 lbs. Section 179 of the internal revenue code allows the direct write-off only in the year the vehicle is placed in service. If the vehicle costs more than $25,000, then the excess over that amount is depreciated over 5 years.
If your vehicle is used less than 100% for business, you can only take a percentage of the $25,000. If it is less than 50% business use, you can not take any section 179 expense.
Since the vehicle is used, it does not qualify for bonus depreciation.