loss reserve: The liability recorded on the balance sheet for unpaid losses. The loss reserve consists of the case basis reserve, the reserve for claims known to the company but not yet paid; and the reserve for incurred but not reported losses (IBNR). IBNR in residential mortgage insurance is a small amount compared to IBNR in many long-tail property-casualty lines of business and consists mainly of an estimate of the aggregate dollar amount of currently delinquent mortgages which will remain delinquent or go to claim in a short period of time, causing the establishment or increase of case basis reserves for those mortgages.
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