50 ILCS 355/5-30
Annually, the third party shall provide the municipality or county with a final summary of the review for publication. It is the responsibility of the third party to ensure that this summary includes no personal or identifying information of taxpayers and that all such taxpayer information is kept confidential. If the summary includes any discussion of tax revenue, it shall include only aggregate amounts by tax type, and shall in no way include information about an individual return or an individual taxpayer, even with identifying information redacted. No aggregated data may be published that includes taxpayer information for 4 or fewer taxpayers. In addition, due to the preliminary nature of such a summary based only on unaudited financial information, no claim of specific tax savings or revenue generation may be made in the summary.
50 ILCS 355/5-30