Do you own a business in Illinois? Here’s some helpful links and information.
There is state income tax in Illinois. Employers should have their employees fill out form IL-W-4.
Additional information on Illinois’s income withholding tax, can be found here.
Illinois does have reciprocity agreements with Iowa, Kentucky, Michigan and Wisconsin. If any of your employees reside in one of those states they need to complete form IL-W-5-NR
Additional information on Illinois’s income reciprocity agreements can be found here.