File for homestead exemption online. Currently the online application is only for Homestead Exemption and Portability.Property owners in Florida may be eligible for exemptions and additional benefits that can reduce their property tax liability. The deadline for filing for exemptions is March 1st. Exemption forms are available from the Miami-Dade County Property Appraiser's Office. 9. You are in the process of filing a petition with the Value Adjustment Board (the "VAB") to request a tax exemption or property classification for 2018. This. If, as a new owner, you want to receive a Homestead Exemption in Miami-Dade or Broward County, you must apply before March 1st of the following tax year. If, as a new owner, you want to receive a Homestead Exemption in Miami-Dade or Broward County, you must apply before March 1st of the following tax year. Chevron-up Icon Homestead Fraud. Senior Citizen Exemption.