Mike Kehoe supported a ballot measure to eliminate the state income tax, which was resoundingly defeated at the polls Tuesday. Office of Governor Mike KehoeMissouri voters on Tuesday soundly rejected Amendment 5, which would have eliminated the state income tax. Missouri has a graduated individual income tax and a flat corporate income tax rate, according to the Tax Foundation . "The legislature did not need to amend the Missouri constitution to eliminate the income tax. Missouri Realtors again "went the citizen initiative petition route," Charton said, noting that plans to tax services included a tax on realtor commissions.