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Reinsurance is insurance that an insurance company purchases from another insurance company to insulate itself (at least in part) from the risk of a major claims event.[1] With reinsurance, the company passes on ("cedes") some part of its own insurance liabilities to the other insurance company. The company that purchases the reinsurance policy is referred to as the "ceding company" or "cedent".[2] The company issuing the reinsurance policy is referred to as the "reinsurer". In the classic case, reinsurance allows insurance companies to remain solvent after major claims events, such as major disasters like hurricanes or wildfires. In addition to its basic role in risk management, reinsurance is sometimes used to reduce the ceding company's capital requirements, or for tax mitigation or other purposes.[1]
The reinsurer may be either a specialist reinsurance company, which only undertakes reinsurance business, or another insurance company. Insurance companies that accept reinsurance refer to the business as "assumed reinsurance".[3]
There are two basic methods of reinsurance:
There are two main types of treaty reinsurance, 'proportional and non-proportional, which are detailed below. Under proportional reinsurance, the reinsurer's share of the risk is defined for each separate policy, while under non-proportional reinsurance the reinsurer's liability is based on the aggregate claims incurred by the ceding office. In the past 30 years there has been a major shift from proportional to non-proportional reinsurance in the property and casualty fields.