Illinois Audit, Tax and Consulting

The fifth largest in Illinois

With eight offices and more than 1,400 professionals throughout the state, we’re not only the fifth-largest accounting firm in Illinois, but also the largest focused on middle market companies. We combine full-service capabilities with deep resources, industry knowledge and senior-level involvement to help our clients succeed. Illinois is also home to RSM’s corporate headquarters, located at One South Wacker Drive in Chicago.

Our client service

Our Illinois offices serve midsized businesses in a variety of industries, including manufacturing and wholesale distribution, financial institutions, health care, real estate, private equity groups, financial services, government entities and nonprofit organizations.

Our charitable efforts

In addition to serving the needs of our clients, our Illinois offices are committed to serving the needs of our community. Through the personal and collective efforts of our professionals, we are actively involved by devoting time, money and support to a variety of charitable organizations and community efforts.  Some of the representative organizations include the Greater Chicago Food Depository, YMCA, Big Brothers Big Sisters, The Salvation Army and Special Olympics Illinois.

Employment opportunities

For information about the employment opportunities currently available in Illinois, please visit the Careers section of our site.

Illinois Insights

Illinois adopts SALT deduction workaround for pass-through entities

Illinois becomes the latest state to adopt a pass-through entity tax as a workaround to the federal SALT deduction limit.

Illinois revises rules for nonprofits making tax-exempt purchases

New and clarified regulatory requirements for purchases made by, or on behalf of, exempt entities in Illinois effective June 3, 2021.

Illinois offers $250 million in grants for COVID-19 recovery

Small businesses that experienced losses in 2020 due to COVID-19 are eligible for grants ranging up to $250,000.

State tax law changes for the second quarter of 2021

A summary of important updates for determining deferred tax provision under ASC 740 for the quarter ending June 30, 2021.

Illinois enacts fiscal year 2022 budget with tax changes

Significant tax changes made to GILTI, bonus depreciation, net operating loss limitations and the phase-out of the state’s franchise tax.

Chicago provides narrow guidance on Wayfair economic nexus

A new nexus safe harbor is available for remote sellers making under $100,000 of sales to Chicago customers in the previous four quarters.

2020 Elections: State and local tax ballot measures to know

Looming budget shortfalls coupled with tax-related ballot measures in many states could significantly affect 2021.

Illinois tax tribunal: company president liable for withholding tax

President held personally liable for unpaid income tax withholding even after another corporate officer found responsible.

Middle market relief for businesses impacted by the coronavirus

Widespread availability of credits and economic incentives during the COVID-19 pandemic may help businesses increase cash flow.

Illinois sales tax ruling on financial services software and services

Financial services businesses providing software and services to Illinois customers may have multiple transaction tax obligations.

Illinois Locations

Corporate Headquarters

30 S Wacker Dr
Suite 3300
Chicago, IL 60606

John Bird, Chicago market leader
John George, Chicago market leader
Pete Mulvey, Chicago market leader
Paul Nockels, Chicago market leader


2021 S. 1st Street
Suite 110
Champaign, Illinois 61820

John Kaiser, Central Illinois market leader


117 East Main St.
Suite 210
Galesburg, IL 61401

John Kaiser, Central Illinois market leader


401 Main St.
Suite 1200
Peoria, IL 61602

John Kaiser, Central Illinois market leader


1252 Bell Valley Road
Suite 300
Rockford, IL 61108

Pat Shaw, Rockford office leader


20 N. Martingale Road
Suite 500
Schaumburg, IL 60173

Rob Stoettner, Schaumburg market leader


3161 West White Oaks Drive
Suite 204
Springfield, IL 62704

John Kaiser, Central Illinois market leader

Careers in Illinois

Search open positions in Illinois, or learn more about working at RSM.

Still a student? Learn more about our Internships.

Illinois Events

2019 Illinois Government Finance Officers Association conference

Join us for the 2019 Illinois Government Finance Officers Association (IGFOA) annual conference, Sept. 8-10, 2019.

  • September 08, 2019

United Fresh 2019

FreshTec 2019 features networking, education, and a product showcase with produce operations and fresh-cut processing executives.

  • June 10, 2019

RSM Technology Summit Chicagoland

The RSM Technology Summit is a one-day event that offers educational sessions specifically for Microsoft Dynamics GP users.

  • May 07, 2019