Illinois' manufacturers want some certainty. Mark Denzler with the IMA says big companies are looking for a set of rules that don't change with the wind, which is why the group is pushing four tax exemptions at the Capitol.

Denzler says the biggest, the research and development grant, is worth big money to companies in the state but has expired four times over the past 13 years.

The IMA is also asking for certainty on exemptions for graphic arts and coal mining.