Mo. Rev. Stat. § 144.740

Any person who willfully makes a false return, or who willfully makes a false statement in any return filed with or transmitted to the director of revenue relating to the amount of any sales or tax due under sections 144.600 to 144.745 shall, in addition to other penalties provided by law, and upon conviction thereof, be fined not more than ten thousand dollars, or be imprisoned in the county jail for not more than one year or by not less than two nor more than five years in the state penitentiary or by both fine and imprisonment together with the cost of prosecution.