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Scam Alert: Fake Texts and Websites Impersonating IDOR

Be alert for fraudulent messages or websites attempting to steal your banking information, login credentials, or credit card details. The Illinois Department of Revenue (IDOR) will never request personal or financial information via text message. To confirm official communications or contact details, always visit https://tax.illinois.gov.

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Affordable Housing Special Assessment Program

The Illinois Department of Revenue is required to annually certify a percent change in Consumer Price Index (CPI) for purposes of administering the Affordable Housing Special Assessment Program. 35 ILCS 200/15-178.

Illinois Department of Revenue History of CPI-U and Percent Increase Used for Affordable Housing Special Assessment Program 01/13/2026
Calendar Year CPI Assessment Year January CPI-U December CPI-U Percent Increase
Base Year 2021 2022 — — 0.00%
2022 2023 281.148 296.797 5.57%
2023 2024 299.170 306.746 2.53%
2024 2025 308.417 315.605 2.33%
2025 2026 317.671 324.054 2.01%

Source: Bureau of Labor Statistics CPI Data  

PTAX-AFH (N-01/26)