Average gov't school per-pupil expenditures are about $10k nationwide. Under a typical voucher program, parents are given vouchers worth half of that, or $5k/child.
Vouchers save the taxpayers money, but cost the teacher unions jobs.
A couple of problems with that. Kansas is a rural state, and the overwhelming majority of the school districts are rural districts with no private school alternatives available. Second problem, do you know what kind of income a couple has to have to result in a $5000 state income tax bill? Depending on deductions it's well over $110,000. So again, when the state is facing a deficit why would you subsidize private school tuition?