First-time Homestead Exemption applicants and persons applying for the Homestead Assessment Difference (Portability) can file online. Currently the online application is only for Homestead Exemption and Portability.The deadline for filing for exemptions is March 1st. Exemption forms are available from the Miami-Dade County Property Appraiser's Office. 9. Contact your local property appraiser if you have questions about your exemption. File the signed application for exemption with the county property appraiser. You should complete all required forms and applica ons for the exemp on and file them with your county property appraiser. Applicants must file Form DR-501T, Transfer of Homestead Assessment Difference, to the property appraiser of the county in which their new home is located. A Florida Identification Card with an out of state driver license is not acceptable.