626e402c_ois_Employers___Tax_Foundation__Industry
77% (2nd largest share) 53% (5th largest share) [Economic Position of Industry] In forecasts of the state’s long-term economic future, the high-tech services industry has been cited as source of future state growth.[24] This industry’s employment is at the highest level it has ever been, and jobs in the subsector are high-paying.[25] Real state GDP for legal services was severely impacted during the peak of the recession in Illinois and saw negative growth the next two years (the only subsector in this industry that had negative growth during these years).[26] [Industry] 
Professional, Scientific, and Technical Services
Moving to a Progressive Income Tax Would Increase Taxes on the Majority of Illinois Employers | Tax Foundation
Industry