Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
incentive [ɪnˈsɛntɪv] n (inducement) сти́мул
cpd
incentive scheme систе́ма поощре́ния
incentive bonus материа́льное поощре́ние
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.