Amends the Illinois False Claims Act. Provides that no court has jurisdiction over a civil action relating to or involving a false claim regarding certain tax acts administered by the Department of Revenue unless the action is brought by the Attorney General. Provides that the Department of Revenue has the sole authority to bring an administrative action and that the Attorney General has the sole authority to bring a judicial action under the Act for a false claim, statement, or record pertaining to certain taxes administered by the Department of Revenue. Contains provisions concerning reporting, investigative, and enforcement procedures for allegations of false claims pertaining to certain taxes. Contains provisions governing the payment of rewards to persons who provide information that leads to recovery of funds under the new provisions. Provides that the appeal of a determination regarding an award may be appealed exclusively to the Court of Claims and must be filed within 30 days of the determination of the award. Makes other changes, including a corresponding change in the Court of Claims Act. Effective January 1, 2020.