discretionary
adjective /dɪˈskreʃənəri/
  /dɪˈskreʃəneri/
[usually before noun] (formal)- decided according to the judgement of a person in authority about what is necessary in each particular situation; not decided by rules
- You may be eligible for a discretionary grant for your university course.
 - The court has a discretionary power to appoint a receiver in such circumstances.
 
Oxford Collocations DictionaryDiscretionary is used with these nouns:- award
 - grant
 - income
 - …