Income contingent schemes have been widely used in student lending in the few last decades. Recently, in the aftermath of the crisis of 2007-2008, several authors argued that income contingent loans have much better risk profiles than traditional fixed loans, and they proposed to extend their scope to other areas of retail lending, too. Hence, understanding this scheme can be relevant from the point of view of both human resource management and financial engineering. In this paper we analyzed the unusual characteristics of income contingent repayments, and derived closed formulas for stability, success and shape. We concluded that humped debt paths can be frightening; however, if the growth rate of the debt is lower than the growth rate of the income, then it is not a debt trap, but a natural consequence of this patient and flexible scheme, which requires new methods of communication, risk management, financing and administration.
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