Get help using My DOR for estate tax. What is the estate tax?How do I file the estate tax return? You can locate excise tax and supplemental forms on the Department of Revenue website. The Assessor's office reviews and valuates all real property in Franklin County with the aid of a state approved mass appraisal software system. A property tax is a levy on property that the owner is required to pay, with rates set as a percentage of the home value.