The Illinois Senior Freeze Exemption application is an income-based tax exemption program for seniors who are 65 years or older and have a total household income that is below the income limit set by the state. Seniors with qualifying incomes are eligible to receive an exemption from property taxes on their primary residence in Illinois. The Senior Freeze Exemption application must be filed each year with the county assessor's office in order to receive the exemption. There are two types of Illinois Senior Freeze Exemption application, the initial application and the renewal application. The initial application is used for first-time applicants who are 65 years or older and have a total household income that is below the income limit set by the state. The renewal application is used by applicants who have already received the Senior Freeze Exemption in a prior year and need to renew their exemption. Both the initial and renewal applications require proof of age, proof of ownership of the property, and proof of household income.