You must file with the county or city where your home is located. Each county has different applications and required documents.If you own and live in your home, you are likely eligible for the Regular Homestead Exemption. If you own and live in a house in Fulton County, you may qualify for homestead exemption. Here are links to online Decatur's property tax exemption forms. Please see farther below for details on procedures and eligibility. Homestead exemption is used to lower your property tax. If your monthly mortgage payment include an escrow for the property tax, the answer is yes.