La modélisation des avantages au personnel : complexité et limites du modèle actuariel, le rôle majeur des comportements humains

The study is about the financial modelling of the advantages offered to the employees of a company. It shows in several steps, the way to build an actuarial model which aim is to evaluate the financial burden of social commitments granted by a company. The aim is to enter the commitments in the accounts, at their fair value, of the relating financial provisions in accordance with the International Financial Reporting Standards (IFRS) defining the employees benefits (IAS 19). It is demonstrated by a concrete example. Said example is the one of a phased-in retirement held at SNCF on 2008 (source : Advisory Board for Pensions ("COR : Conseil d'Orientation des Retraites"), document n°10, 11/02/2009). The aim is to show the complexity of such a modelling in terms of method and of choice of modelling, and the limits of the assumption (theoretical formalisation and calibration). The complexity and major role of human behaviour knowledge are underscored in the light of the estimation of the trust given to the financial assessment obtained. To conclude, it is possible to obtain a tangible range of results to react toward the image of the financial implication. Nevertheless, it does allow to obtain a range of sufficient credibility to handle with trust such social advantages.