disincentive

dis|in|cen|tive /d'ɪsɪns'entɪv/ (disincentives)
[N-VAR] oft N to n/-ing, N to-inf
A disincentive is something which discourages people from behaving or acting in a particular way. (FORMAL)
High marginal tax rates may act as a disincentive to working longer hours.
= deterrent
incentive