The Illinois Certificate of Error-Senior Citizen Exemption is a document issued by the Illinois Department of Revenue to provide a monetary exemption to qualified senior citizens. This certificate allows senior citizens who meet certain criteria to be exempt from paying certain taxes on their incomes. There are two types of Illinois Certificate of Error-Senior Citizen Exemptions: the Homestead Exemption and the Special Senior Citizen Exemption. The Homestead Exemption is available to any senior citizen who owns and occupies a primary residence in Illinois. The Special Senior Citizen Exemption is available to senior citizens who are 65 years of age or older, and meet certain income and asset criteria. In order to qualify for either of these exemptions, the applicant must provide proof of age, income, and assets.