5 ILCS 70/6
Two or more Acts which relate to same subject matter and which are enacted by the same General Assembly shall be construed together in such manner as to give full effect to each Act except in case of an irreconcilable conflict. In case of an irreconcilable conflict the Act last acted upon by the General Assembly is controlling to the extent of such conflict. The Act last acted upon is determined by reference to the final legislative action taken by either house of the General Assembly, whether such final action is passage on third reading in the second house, concurring in or receding from an amendment, adoption of a conference committee report, acceptance of the Governor's specific recommendations for change, or passage over the Governor's veto. However, for the purpose of determining the effective date of laws under Section 10 of Article IV of the Constitution of 1970 and "An Act in relation to the effective date of laws", approved July 2, 1971, a bill is "passed" at the time of its final legislative action before presentation to the Governor as provided in paragraph (a) of Section 9 of Article IV of the Constitution of 1970.
An irreconcilable conflict between 2 or more Acts which amend the same section of an Act exists only if the amendatory Acts make inconsistent changes in the section as it theretofore existed.
The rules of construction provided for in this section are applicable to Acts enacted by the same General Assembly throughout the 2 year period of its existence.
5 ILCS 70/6