On Wednesday, August 20, 2025, IIT phone lines will be down for maintenance. However, you can access tax account information or ask a question online.
Marihuana Retailers Excise (MRE) Tax
Homeowner's Principal Residence Exemption
Property Tax Forfeiture and Foreclosure
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This letter was sent because an adjustment was made to your return for the identified tax year. An explanation of the adjustment(s) will begin in the second paragraph of the letter. If you disagree with the adjustment(s), submit documentation to support your claim. Do not send original documents, as they will not be returned.
Example: If your withholding was adjusted, submit a copy of your W-2 and/or 1099 forms on 8 ½ x 11 paper to verify your withholding amount.