Low income already taxed to the hilt

Jerry McConoughey had this letter in the April 3 Dispatch/Rock Island Argus. "Regarding the proposed sales tax for schools, there is no doubt the schools need more money, and I'm all in favor of finding a source of funding. But increasing the sales tax is not a fair way to do it. The burden of such a tax would fall on the poor and those on fixed incomes. A much fairer way to fund our schools is through an increase in the graduated income tax so those who earn more pay a little more. ..... This is what Minnesota did and it's working fine. An alternative, but not a very good one, is to enact a luxury tax on certain high-priced items such as luxury cars. I know some people think the proposed tax is so small that it would not financially harm anyone. Unfortunately, low-income people are already taxed to the hilt and even a modest increase would hurt them. And I, for one, do not want to see that happen.