All exemption applications must be filed with the assessor on or before March 1st of each year. Complete the Homestead Declaration form.The form must be printed legibly in black ink. Homestead Exemptions. The deadline for filing an application for a homestead exemption in Athens-Clarke County is April 1. Appeals must be filed on the proscribed form within 30 days of the postmark date of the County Bd. Disabled applicants must complete form DTE 105E,. Complete and sign the application form; Gather supporting documentation; Mail or deliver your application to the Clark County Assessor's Office. A copy of one photo ID from List A must be provided along with an Occupancy Affidavit (the affidavit is provided within the online application). Compliant forms must be filed before March 31 of the current year.