All exemption applications must be filed with the assessor on or before March 1st of each year. Forms: DTE 105 A - Homestead Exemption Application for Senior Citizens, Disabled Person and Surviving Spouses.Complete the Homestead Declaration form. The form must be printed legibly in black ink. The senior citizens homestead exemption (35 ILCS. Disability Benefits can apply for the property tax deduction. The Tax Exemption Program for Senior Citizens and People with Disabilities reduces your property tax liability. You do not need to repay these taxes.