You can claim deductible business auto/truck expenses in one of two ways.
- IRS Mileage Rate: You can claim business miles times the IRS mileage rate. IRS mileage rates for business activities are $0.56/mile in 2014 and $.575/mile in 2015. You can add parking and tolls to the mileage rate.
- Actual Cost: You can claim your actual costs including depreciation (or, for a lease, lease payments) times the percentage that you use your car for business. Actual costs would include gas, oil, insurance, repairs, etc. Payments on a note would not be deductible. The cost of the vehicle would be deducted through depreciation instead (or lease deducting lease payments if you lease it.)