215 ILCS 5/55
In cases where contingent liability of members is provided for, the provision therefor shall be plainly stated in each policy with prominence equal to the indemnifying clause. In addition, each such assessable policy, other than an accident or health policy, issued or delivered in this State insuring against the hazards included in Class 2, subparagraph (b) of Section 4 after September 1, 1967 must have the following statement printed in bold face on the face of the policy: "This is an assessable policy". If a mutual company other than life has a surplus equal to the capital and surplus required in Section 13, for a stock company transacting the same kind or kinds of business, such company may issue policies without contingent liability. Any such mutual company which shall have issued policies without contingent liability after the acquisition of such surplus may continue to do so as long as it maintains a surplus equal to the capital and surplus of a stock company doing the same kind or kinds of business, but no company may issue such policies except during such time as it shall continue to have such a surplus, but any company which is, immediately prior to July 1, 1965, issuing policies without contingent liability, may continue to do so as long as it maintains a surplus equal in amount to that which would have been required immediately prior to July 1, 1965. After July 18, 1967, no company subject to this Article may make, levy or impose upon its members any assessment based on their contingent liability unless ordered to do so by the Director under Section 60 of this Code.
215 ILCS 5/55