Mo. Rev. Stat. § 288.150
Contributions unpaid for any quarter which become due and payable after the last day of the calendar quarter in which this act became* effective (August 28, 1994) shall bear interest at the rate established by the Internal Revenue Code pursuant to Title 26, Section 6621(b), in effect on the date on which such contribution became due, provided, however, that such interest shall abate for any period of any extension of time granted by the division pursuant to the provisions of section 288.090. Such interest shall accrue for each month, or part of a month, after such date until payment is received by the division, except that:
(L. 1951 p. 564, A.L. 1982 H.B. 1521, A.L. 1994 S.B. 559, A.L. 1998 S.B. 922)
Effective 1-01-99
*Word "becomes" appears in original rolls.