Wage earners were never required by the Law to tithe. Jesus did not tithe. Modern tithe teaching is purely a man-made doctrine to guilt people into supporting institutional religion and its professional clergy class.
Just to clarify for those who really do not know.
What you said was not the case for when tithing was instituted.
For, Israel was a theocracy.
Now, corrupted clergy use it the way as you stated, in distortion and abuse.