A mechanism contained in a proportional or an excess of loss agreement that requires the ceding insurer to be responsible for a certain amount of ultimate net loss above the company’s designated retention and below the designated reinsurance limit, and which would otherwise be reimbursed under the reinsurance agreement. A loss corridor is usually expressed as a loss ratio percentage of the reinsurer’s earned premium, or a combined ratio if the reinsurance agreement provides for a ceding commission to the company. Loss corridors are employed to mitigate the volatility or variability of reinsurance loss projections and pricing risk and to enhance the alignment of interests of the ceding insurer and the reinsurer.