40 ILCS 5/2-148

The Speaker of the House and the President of the Senate, in the preparation of payroll vouchers for payments of salary to participants, shall indicate in addition to other things: (1) the amount of contributions to be deducted from the salary of each participant included in each voucher, (2) the net amount payable to each participant after such deductions and, (3) the total of all participant contributions so deducted. An additional certified copy of each payroll voucher certified by the State shall be prepared and forwarded along with the original payroll voucher to the State Comptroller for transmittal to the board as herein provided.