This Law Firm Publication by Fisher & Phillips LLP discusses the increase in the Missouri minimum wage from $7.35 to $7.50 and from $3.68 to $3.75 for tipped employees. This increase, which applies to all employers except retail and service businesses with less than $500,000 in annual gross sales, took place under a statutory cost of living formula.These changes went into effect on January 1, 2014.