FOR COUNTY AUDITOR'S USE ONLY: Taxing district and parcel or registration number. Auditor's application number.Now you can file for the Homestead Exemption using our NEW SmartFile Paperless web-based filing system! Lake County Homestead Exemption. Only one Homestead application is allowed per property. 2. You must notify the Auditor's office of any changes to ownership or eligibility status. The Homestead Exemption application can be filled out at the county auditor's office in which the property is located.