contingent upon vs contingent on

contingent upon and contingent on both are adjectives.

Word	Noun	Adjective	Verb	Adverb
contingent upon	No	Yes	No	No
contingent on	No	Yes	No	No

As adjectives, contingent upon and contingent on are synonyms defined as:

contingent upon and contingent on: being determined by conditions or circumstances that follow

Other synonyms of contingent upon include contingent, dependant on, dependant upon, dependent on, dependent upon, depending on.

contingent upon (adjective)	contingent on (adjective)
being determined by conditions or circumstances that follow	being determined by conditions or circumstances that follow