When insured parties experience a loss for a specified peril, the coverage entitles the policyholder to make a claim against the insurer for the covered amount of loss as specified by the policy. The fee paid by the insured to the insurer for assuming the risk is called the premium. Insurance premiums from many insureds are used to fund accounts reserved for later payment of claims – in theory for a relatively few claimants – and for overhead costs. So long as an insurer maintains adequate funds set aside for anticipated losses (called reserves), the remaining margin is an insurer's profit.
Med Pay and bodily injury insurance are two other types of coverage that usually follow the person, not the car. Med Pay coverage pays for any injuries that an insured or his passengers may incur in an accident, regardless of who is at fault. Such coverage usually follows the driver. It is based on people, not the vehicle. In fact, such coverage sometimes covers the insured when he is walking or biking. This coverage also usually follows the driver when he rents a car, because the rental vehicle is a substitute for the insured’s own vehicle. However, Med Pay coverage sometimes follows the car. If the passengers in a vehicle don’t have coverage of their own, Med Pay and PIP coverage can extend to their injuries.
The financial stability and strength of an insurance company should be a major consideration when buying an insurance contract. An insurance premium paid currently provides coverage for losses that might arise many years in the future. For that reason, the viability of the insurance carrier is very important. In recent years, a number of insurance companies have become insolvent, leaving their policyholders with no coverage (or coverage only from a government-backed insurance pool or other arrangement with less attractive payouts for losses). A number of independent rating agencies provide information and rate the financial viability of insurance companies.