Assuming you have another car available for personal use and this truck is "strictly" for business use it will more than likely be to your tax advantage to lease the vehicle. Your entire lease payment will be deductable. I'll try and give you an example using 15,000 miles a year for the first year. Purchase vehicle actual expense method:depreciation=$3060 (20% of vehicle cost limited to $3060), gas=$1500, insurance=$1000, repairs and maintenance=$750, this gives you a total deduction of $6310. Purchase using standard mileage will give you a total dedction of $4650. Now I'll give you the figures using the lease method. Lease using standard mileage will give you the same deduction of $4650. Now leasing using the actual cost method:lease payments=$4800(assuming $400 a month), gas=$1500, insurance=$1000, repairs and maintenace=$750, giving you atotal deduction of $8050. this gives you a $1740 bigger deduction than purchasing. Assuming your in the 28% bracket plus 15% self employment tax this gives you $748 additional dollars in your pocket every year, over 4 years you save almost $3000(this figure varies a little bit since the depreciation deduction for purchasing varies from year to year). If you tell me your lease payment amounts, mileage for the year, and insurance costs I will redo all the numbers and give you actual figures to see which method is best for you.