Webto further address the gap between wages and the unpredictable rise in inflation, by agreement, the 3. 5% increase is retroactive to december 1, 2021. As the cook county. Webhow to read volume ii of the cook county budget book the president’s executive budget recommendation contains summary information about the proposed. Weban employee who is promoted to a position in a higher salary grade shall be entitled to placement in the step of the new salary grade which will provide a salary of their. Webthe average employee salary for cook county, illinois in 2023 was $91,923. This is 28. 1 percent higher than the national average for government employees and 26. 7 percent.