tithable

noun

1. one tenth of the annual produce of one's land or of one's annual income, paid as a tax or contribution to support a church or its clergy
2. 1. a tenth part
   2. any small part
3. any tax or levy

transitive verb tithed, tithing

1. to pay a tithe of (one's produce, income, etc.)
2. to levy a tithe on or collect a tithe from

intransitive verb