You would be responsible for the whole deductible amount yourself as the policyholder. Financing documents normally require you to obtain state liability and physical damages of collision and comprehensive on the vehicle and have you responsible to pay the deductible if you need to use any coverage that requires a deductible to be paid.

Though the lien holder has the title on the vehicle until you pay for it completely and mandates that you have proper insurance coverage on the car, you the car purchaser is the one responsible for maintaining the insurance thus paying for any deductibles due in event of a claim.