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Technical reserves have three parts: case reserves on reported claims, an IBNR provision for claims incurred but not yet reported, and a loading for unallocated claims handling expense. IBNR is estimated from development patterns and is the largest source of reserving uncertainty.
IBNR
IBNR = Reported outstanding x IBNR factor %
Total reserve
Reserve = (Case reserves + IBNR) x (1 + Claims handling expense %)
Ultimate incurred
Ultimate = Paid to date + Case reserves + IBNR
Simplified reserving illustration only. Statutory reserving requires actuarial methods, development triangles, discounting and risk margins under the applicable framework. Not actuarial or accounting advice.
Because claims take time to be reported, especially liability and injury claims. Without IBNR the reserve understates the ultimate cost of the year.
From loss development triangles — chain-ladder or Bornhuetter-Ferguson methods — applied to historical reporting patterns for the class of business.