Before Trump finishes his tax plan, he might want to go to Kansas
Sam Brownback
Sam Brownback

(Kansas Gov. Sam Brownback.AP Photo/Charlie Riedel)

President Trump's tax plan doesn't have a lot of details yet, but Treasury Secretary Steven Mnuchin gave us one big clue — a proposed 15% business tax rate, a big drop from the current 35%.

But ask some Kansans and you'll learn how that kind of tax cut could have serious unintended consequences.

In 2013, as part of the state's largest-ever tax cuts, Kansas slashed its business tax rate down to 0%. It was supposed to spur economic growth.

After all, if businesses have more money in hand, they can, theoretically, hire more people and invest in making new products.

Instead, researchers from a number of institutions say it turned more into a "tax avoidance" program, rather than encouraging investment. A lot of white-collar workers like law partners, accountants, and doctors stopped taking salaries and instead started claiming the profits of the business. For them, state income tax essentially went from a maximum of 4.6% to nothing. This has led to the ongoing budget crisis.

“Kansas has been an unmitigated budgetary disaster,” says Dr Lori McMillan, a tax-law professor at Washburn University told Business Insider. “It was a very messy, blunt club when a scalpel was needed.”

The economic growth from the tax cuts never materialized. Kansas was saddled with an almost instantaneous budget hole, leaving schools and pensions drastically underfunded. Infrastructure repairs were put on hold. And to deal with a $700 million drop in revenue — almost twice what was predicted — Kansas raised its sales tax, hurting all residents, but especially lower income Kansans.

Kansas has some peculiarities, but the lessons still apply nationally. In the state, the 0% tax applies only to "pass-through" businesses, which send their profits directly to the companies' owners. Before this law, those owners would just pay Kansas' individual tax rate. The 2012 law effectively created a new category just for them, where they pay nothing.

Screen Shot 2017 05 04 at 6.30.09 PM
Screen Shot 2017 05 04 at 6.30.09 PM

(The Tax Foundation)

Nationally, 90% of US companies are pass-throughs, according to the Tax Foundation, so it's possible Trump's tax cut would have similar effects. It could also encourage some higher-income workers to become independent contractors rather than remain companies' employees.

"The logic is simple," Joseph Rosenberg and Leonard Burman of the Tax Policy Center say. "If wage income is taxed at 33 percent but business income is taxed at 15 percent (as under Trump’s campaign proposal), taxpayers may reduce their tax liability by more than half if they can effectively recharacterize their wage income as business income.”