The governing body of each State institution coming under this retirement system, the State Comptroller or other State officer certifying payroll vouchers including payments of salary or wages to teachers, and any other employer of teachers, shall, monthly, forward to the secretary of the retirement system the member contributions required under this Article.
Each employer specified above shall, prior to August 15 of each year, forward to the System a detailed statement, verified in all cases of school districts by the secretary or clerk of the district, of the amounts so contributed since the period covered by the last previous annual statement, together with required contributions not yet forwarded, such payments being payable to the System.
The board may prescribe rules governing the form, content, investigation, control, and supervision of such statements and may establish additional interim employer reporting requirements as the Board deems necessary. If no teacher in a school district comes under the provisions of this Article, the governing body of the district shall so state under the oath of its secretary to this system, and shall at the same time forward a copy of the statement to the regional superintendent of schools.
The board may also require reporting requirements that are different than those prescribed in this Section and may require different reporting requirements for different benefits or purposes established under this Article, including, but not limited to, any optional benefit plan an employee chooses to participate in.
40 ILCS 5/16-155