If you are considering buying a home, do you know how to calculate the portability benefit? 

Residential property owners with a qualified Homestead Exemption can transfer all or a significant portion of their "Save Our Homes" benefit to their new property. Portability allows you to transfer up to $500,000 of your property’s actual 3% assessment cap to your new property anywhere in Florida.  

http://www.pcpao.org/PortabilityCalculator.html

http://www.miamidade.gov/pa/faq_portability.asp