The purpose of the Northern Illinois Business Advocacy Coalition is to act as the grassroots lobbying organization for member Chambers of Commerce of the Northern Illinois region. Current Chambers that are part of NIBAC include: Arlington Heights, Barrington, Buffalo Grove, Des Plaines, Elgin, Hoffman Estates, Lake Zurich, Mount Prospect, Rolling Meadows, and Wheeling/Prospect Heights along with the Greater O'Hare Association and Schaumburg Business Association. NIBAC will engage in issues-oriented strategic and tactical programs in government relations on the State, County, Regional and National level.

NIBAC will achieve this purpose by developing and executing programs that inform and educate its members, and advocate for and against legislation that impacts on the business community in Northern Illinois. NIBAC will identify, quantify and communicate to its membership, key State, County, Regional and National business-related issues and provide programs to address those issues identified as either beneficial or detrimental to the business community of the region.