Supplemental Liability Insurance (SLI) is another type of coverage that you will encounter while renting a car. This provides liability protection for up to $1 million. Rental companies are required by law to provide the state required amount of liability insurance. For a fee of approximately $10 per day, the car rental company will supplement the liability insurance that the company must, by New York law, provide. If you are a renter who has minimal assets, the minimum coverage that car rental companies provides may be adequate to protect you from lawsuits by victims of accidents involving the rental car. If you have your own automobile insurance policy with coverage above the minimum amounts, your policy should cover you when you operate a rental vehicle, so SLI is likely not needed. However, since SLI usually provides $1 million of liability protection, considerably more coverage than most consumers have under their own automobile insurance policies, if there is a reason that you want more coverage for the rental than you ordinarily carry for your own car or you do not have an automobile insurance policy, buying the SLI may make sense.