If your rental car gets scratched, dented, or damaged in any other way, you may be on the hook for the costs. You can purchase a collision damage waiver, to cover the costs of damaging the rental, for $20 to $30 a day. If you have your own car insurance policy, your comprehensive or collision coverage may cover damage to a rental car. You’ll have to pay a deductible first, though, and it won’t be worth filing a claim if the damage is less than your deductible.