First there IS a difference between increase and income although I would not expect YOU to recognize that fact! Second it is ENTIRELY up to the individual tithe payer to determiner what his increase is! No agent with a gun will show up on your doorstep if you fail to pay your full tithe unlike the WONDERFUL income tax system!
You are a nut, simple as that. This sales tax is obviously a relgious obsession with you. No wonder it is so difficult to deal with you.