A tax exemption enabling business owners to pay no state tax on business income is a boon to many Kansas lawmakers.

The Wichita Eagle reports nearly 70 percent of lawmakers or their spouses own a business or property that allows them to benefit from the exemption.

Gov. Sam Brownback and his wife, Mary, also stand to benefit from the law, which was passed in 2012 at the governor’s urging. Brownback would not discuss his family’s taxes when asked at the Capitol last month.

The law exempts the owners of limited liability companies, S-corporations, limited partnerships, family farms and sole proprietorships from paying state income tax on their non-wage business income. The law also extends to other sources of pass-through income, such as rents, royalties and trusts.