Mo. Rev. Stat. § 86.130: Rates of contribution.

Subject to the provisions of sections 86.010 to 86.193 as to the certification of rates of contribution payable by members until the first valuation, the rates of contribution payable by members according to their ages at becoming members shall be as follows:

Age at becoming a contributor. Rate. Age at becoming a contributor. Rate.

20 3.53% 40 4.52%

21 3.56% 41 4.59%

22 3.60% 42 4.66%

23 3.64% 43 4.73%

24 3.68% 44 4.80%

25 3.72% 45 4.88%

26 3.76% 46 4.96%

27 3.80% 47 5.04%

28 3.85% 48 5.12%

29 3.90% 49 5.20%

30 3.95% 50 5.27%

31 4.00% 51 5.34%

32 4.05% 52 5.42%

33 4.10% 53 5.50%

34 4.15% 54 5.60%

35 4.21% 55 5.70%

36 4.27% 56 5.80%

37 4.33% 57 5.90%

38 4.39% 58 5.99%

39 4.45% 59 6.08%