Ill. Admin. Code tit. 50, § 1705.20
a)
2) Section 288(1) of the Illinois Insurance Code, insofar as it authorizes additional benefits, permits Societies to provide in the life certificate, or supplemental thereto, for the following:
b) If the Director finds that the interests of present and future certificate holders of a Society are not adversely affected, he may authorize the Society to use the Commissioners' 1958 Standard Ordinary Mortality Table for ordinary insurance, and a rate of interest not to exceed 3½ percent per annum for calculating reserves and nonforfeiture values, if: