You must own and reside in your residence in order to take this credit. Each year applicants must complete and file Form PTAX-340 with the Chief County Assessment Officer.Most homeowners are eligible for this exemption if they own and occupy their property as their principal place of residence. You can apply online for any of these exemptions through the Cook County Assessor's Office. Homestead Exemption Application Forms. A person who will be 65 years of age during the current assessment year shall be eligible to apply for the homestead exemption during that assessment year. You can get an application here General Homestead Exemption Form or you can call 630-208-3818 and one will be mailed to you. Owner Occupied Exemption. All applications must be submitted online through the Smartfile E-Filing Portal. There is no annual renewal for this exemption.