In most states, if you have your own auto insurance policy, the coverage will apply to you and the rental car you are using. This means that if there is an accident involving your rented vehicle, your existing auto policy would still provide coverage. However, keep in mind that this type of protection only applies within the United States and its territories – it does not extend to international rentals. In Massachusetts, it is mandated by law that rental car companies must carry a certain amount of liability protection for any accidents involving their vehicles. For example, they must be able to cover up to $5,000 worth of damage claims concerning their cars. After the required liability limits are reached by the rental company, any remaining costs will come out of the renter’s personal auto or named non-owner policy.