This exemption lasts up to four years. Application Due Date: No application is required.The applicant must have owned and occupied the property as of January 1 and must have been 65 years of age or older during the tax year in question. Link to obtain further information about the various exemptions that are offered, the documents and filing process required for each exemption to be claimed. You can apply online for any of these exemptions through the Cook County Assessor's Office. The BOR accepts exemption applications for approximately 30 days, four times each year. Cook County homeowners may take advantage of several valuable property-tax-saving exemptions. A Senior Citizen Exemption Application Form; A closing or settlement statement; Copy of a recent property tax bill; Copy of proof of age and residency. To fill out this application, gather your personal information ready, including social security number and property details. This Video Shows you How to Complete an Application for Homestead Exemption.