http://www.forbes.com/sites/beltway/2014/07/15/whats-the-matter-with-kansas-and-its-tax-cuts-it-cant-do-math/
Kansas Governor Sam Brownback and his state legislature have embarked on a wonderful natural experiment. Once again we are testing the question: Can tax cuts pay for themselves? The answer– yet again– is a resounding no.
We’ve tried this experiment time and again. And tax cut proponents such as economist Art Laffer continue to insist they can turn fiscal dross to gold: Cut taxes deeply enough and the resultant boom in economic activity will boost revenues. Magic. Painless. Everything a politician would ever want.
Except this is fiscal snake oil. Over the past few years, Brownback and the Kansas legislature have gone all-in on this theory. The good news: They have left little room for ambiguity (though Brownback and his defenders are scrambling to find some, given the dismal results of their ambitious experiment).
The tax cuts in Kansas have been breathtaking. In 2012, at Brownback’s urging, the legislature cut individual tax rates by 25 percent and repealed the tax on sole proprietorships and other “pass-through” businesses. It also increased the standard deduction (though it eliminated some individual credits as well).
In 2013, the legislature cut taxes again. It passed a measure to gradually lower rates even more over five years. By 2018, the top rate, which was 6.45 percent in 2012, will fall to 3.9 percent. It also partially restored some of the credits it eliminated in 2012. This time, it did raise some offsetting revenue for the first few years but far less than the statutory tax cuts. The Center on Budget & Policy Priorities wrote up a nice summary of all the tax changes.
So what happened after all those tax cuts? Revenues collapsed.
From June, 2013 to June, 2014, all Kansas tax revenue plunged by 11 percent. Individual income taxes fell from $2.9 billion to $2.2 billion and all income tax collections plummeted from $3.3 billion to $2.6 billion, a drop of more than 20 percent.