10% limit? - that would be tithing the government.
“I am the Lord thy God, thou shalt have no false gods before me.”
Except tithing to God is the minimum. You’re also supposed to give offerings. With the government, tithing should be the maximum. Tithing means a tenth of something. It’s not sacrilegious to use it for non-Scriptural reasons.
If 10% is good enough for Jesus, why, it oughta be good enough for Uncle Sam!