Mo. Rev. Stat. § 287.975
2. The advisory organization which makes a uniform classification system for use in setting rates in this state shall collect data for two years after January 1, 1994, on the payroll differential between employers within the construction group of code classifications, including, but not limited to, payroll costs of the employer and number of hours worked by all employees of the employer engaged in construction work. Such data shall be transferred to the department of insurance, financial institutions and professional registration in a form prescribed by the director of the department of insurance, financial institutions and professional registration, and the department shall compile the data and develop a formula to equalize premium rates for employers within the construction group of code classifications based on such payroll differential within three years after the data is submitted by the advisory organization.
*3. The formula to equalize premium rates for employers within the construction group of code classifications established under subsection 2 of this section shall be the formula in effect on January 1, 1999. This subsection shall become effective on January 1, 2014.
(L. 1993 S.B. 251 § 35, A.L. 2013 H.B. 404 & 614)
*Subsection 3 effective 1-01-14.