payment by results

noun

a system of wage payment whereby all or part of the wage varies systematically according to the level of work performance of an employee

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012