Illinois has a flat tax of 4.95%. The easy way to verify your Illinois tax is to multiply you one month of income times 4.95%. Illinois also has a personal exemption that will be subtracted from your income, but multiplying one month of income tax 4.95% will give you a ballpark estimated if your return is correct.
To correctly complete you return, you will have to allocate the Illinois portion of your California wages on your Illinois return.
You can contact TurboTax. Click on the link here.
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