Purpose
To inform agencies of the change in the Illinois income tax withholding rate.
Affected Employees
Employees who live and work in the State of Illinois
Background
Effective July 1, 2017, the Illinois income and supplemental tax rates will increase from 3.75% to 4.95%.
Effective Date(s)
Institution paychecks dated July 20, 2017
Administration paychecks dated July 26, 2017
Agency Actions
Notify affected Employees.
OSC Actions
OSC will update the Illinois withholding tax table with the new withholding rate percentage of 4.95 percent (.0495).
Questions
Questions regarding this bulletin may emailed to the Tax and Compliance Mailbox.