Reinsurance is insurance that is purchased by an insurance company (reinsurer) from another insurance company (insurer) as a means of risk management, to transfer risk from the insurer to the reinsurer. The reinsurer and the insurer enter into a reinsurance agreement which details the conditions upon which the reinsurer would pay the insurer's losses (in terms of excess of loss or proportional to loss). The reinsurer is paid a reinsurance premium by the insurer, and the insurer issues thousands of policies.
For example, assume an insurer sells one thousand policies, each with a $1 million policy limit. Theoretically, the insurer could lose $1 million on each policy – totaling up to $1 billion. It may be better to pass some risk to a reinsurance company (reinsurer) as this will minimize the insurer's risk.
There are two basic methods of reinsurance:
Facultative Reinsurance In facultative reinsurance, the ceding company cedes and the reinsurer assumes all or part of the risk assumed by a particular specified insurance policy. Facultative reinsurance is negotiated separately for each insurance contract that is reinsured. Facultative reinsurance normally is purchased by ceding companies for individual risks not covered by their reinsurance treaties, for amounts in excess of the monetary limits of their reinsurance treaties and for unusual risks. Underwriting expenses and, in particular, personnel costs,are higher relative to premiums written on facultative business because each risk is individually underwritten and administered. The ability to separately evaluate each risk reinsured, however, increases the probability that the underwriter can price the contract to more accurately reflect the risks involved.