Mo. Rev. Stat. § 144.490: Penalty for false return.

Any person who willfully makes a false return, or who willfully makes a false statement in any return under oath or otherwise filed with or transmitted to the director of revenue relating to the amount of any sales or tax due under sections 144.010 to 144.510, 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.