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Possible online services disruption due to Internet related outage

A worldwide technology outage is causing disruption to some State of Illinois online systems.  We are aware of this issue and are diligently working on restoration.

FY 2024-18, What's New for Illinois Income Taxes

News – Thursday, January 4, 2024

Changes for 2023 Illinois Income Tax forms and schedules for individuals and businesses, 2024 Withholding Income Tax forms and schedules, and tax preparers and software developers.

See FY Bulletin 2024-18, What's New for Illinois Income Taxes for more information.