tax revenue vs tax income

tax revenue and tax income both are nouns.

Word	Noun	Adjective	Verb	Adverb
tax revenue	Yes	No	No	No
tax income	Yes	No	No	No

As nouns, tax revenue and tax income are synonyms defined as:

Other synonyms of tax revenue include revenue, taxation.

tax revenue (noun)	tax income (noun)
government income due to taxation	government income due to taxation