discretionary
dɪˈskrɛʃ(ə)n(ə)ri
adjective
available for use at the discretion of the user.
there has been an increase in year-end discretionary bonuses
optional,non-compulsory,voluntary,at one’s discretion,up to the individual,non-mandatory,elective,open to choice,open,unrestricted,permissive,discretional