What Save Our Homes does
Since 1992, Florida's constitution has limited how much the assessed value of a homesteaded property can rise each year to 3 percent or the change in the Consumer Price Index, whichever is lower. South Florida market values have often risen faster than that, so the assessed value of a home you have owned for a long time can trail its market value by a wide margin.
That gap is called the assessment difference. Your property appraiser's record for your home shows both numbers, usually labeled market or just value, and assessed value. For illustration only, imagine a home with a market value of $800,000 and an assessed value of $500,000. The assessment difference is $300,000. It is the reason owners who have held a home a long time often pay less in property tax than a recent buyer of a similar home.
What portability lets you do
Portability, in place since 2008, lets you transfer that assessment difference to a new Florida homestead, up to $500,000. The homestead exemption itself does not move with you. You apply for it again on the new home, and you file the portability form at the same time.
The new home has to be in Florida, but it can be in any county. A move from Miami-Dade or Broward to Brevard County qualifies. A move out of state does not.
The deadlines that matter
Two dates cause most of the trouble. First, you must establish the new homestead within three assessment years after you give up the old one. The Miami-Dade County Property Appraiser gives this example: if the previous homestead is abandoned in March 2024, the new one must be established by January 1, 2027.
Second, the application is due to the property appraiser by March 1. Homestead status is generally measured as of January 1, so the date you close on the new home can affect which tax year your new exemption and any transferred amount begin. Ask the property appraiser in the new county how your closing date fits before you set it.
When your new home costs less than the old one
This is the situation most downsizers are in. If the new home has a lower market value than the old one, you transfer a share of the assessment difference rather than all of it. The county calculation divides your previous assessment difference by your previous market value, then multiplies the result by the new home's market value.
Using the same illustration, $300,000 divided by $800,000 is 0.375. On a $400,000 replacement home, 0.375 times $400,000 is $150,000. In that example the new home would start with an assessed value about $150,000 below its market value. These numbers are made up to show the method. The property appraiser's staff and calculator give the official figure, and the Miami-Dade portability calculation page walks through it.
What portability does not fix
Portability lowers the assessed value of the new home. It does not change the tax rate. Millage rates differ by county and by taxing district, so ask for a current tax estimate on any specific home you are considering. Insurance, association fees, and utilities are separate costs, and the cost of living guide covers how they tend to compare between Miami and Melbourne.
Portability also does not require you to buy first. The window is measured in years, not weeks, which gives you room to sell first and shop carefully. The sell first or buy first guide covers how to weigh that choice.
Questions to ask before you list
Before you set a sale date, gather these answers:
- Do you currently receive the homestead exemption, and has it been in place continuously?
- What are the market and assessed values on your property record, and what is the difference?
- When will you give up the old homestead, and when could you establish the new one?
- Has the property appraiser in the new county told you how your closing date affects the first tax year?
- Has a CPA or attorney reviewed your situation, including anything about title, spouses, or earlier transfers?
Timing is where the sale and the purchase meet, and it is the part of a South Florida to Space Coast move Semiramis focuses on. If you would like to talk through yours, you can book a call.


