This is a test of commonsense. Complete the next sentence:

How to tithe ten percent to a church
Budget your tithe.
Biblically, a tithe is literally one-tenth of what god has blessed you with. This is not necessarily limited to your paycheck, but that is where most people today begin.
The question of whether to tithe off of the gross or net pay is really a matter for your conscience, but your aim should be to give to god one-tenth of your best. So if seventy-five percent of your check is deducted before you ever see it, you may want to take that into consideration.