MOST STATE TAX SYSTEMS REGRESSIVE: No state has more regressive taxes on its citizens than Washington, followed by Texas, Florida, South Dakota and Nevada, according to a distributional analysis of state tax systems that will be released today by the Institute on Taxation and Economic Policy. Most states take a larger share of income from low- and middle-income families than from wealthy families, it said. The 10 most regressive in the rankings tax their residents in the bottom 20 percent of the income scale at rates up to six times higher than the wealthy, while their middle-income families pay a rate up to four times higher as a share of their income than the wealthiest families, said the report, the sixth edition of the analysis. California is the most progressive, ranking 51st, just ahead the District of Columbia.