If you've owned a Florida home for several years, there's a good chance your property tax bill looks a lot friendlier than your neighbor's on a similar house purchased recently. That gap is the work of the Save Our Homes (SOH) amendment — a constitutional provision that limits how fast your assessed value can rise each year. The annual cap is tied to the Consumer Price Index or 3%, whichever is lower. For 2025, it sat at 2.9%, and for 2026 it's 2.7%. Over a decade or two, that compounding protection builds into a substantial cushion: your home might be worth $600,000 on the open market while your assessed value — the number your taxes are actually based on — is still sitting at $350,000. That $250,000 gap is your SOH differential, and it's worth real money every single year.
Here's where Florida gets genuinely generous: you don't have to abandon that benefit when you move. A provision known as portability lets you transfer all or a portion of your accumulated SOH differential to a new Florida homestead. The portable amount is capped at $500,000, and it can only move to another property within the state of Florida that qualifies for the homestead exemption — but within those guardrails, it's a powerful tool that applies whether you're upsizing to a larger place, downsizing to a condo, or relocating across county lines.
Understanding the SOH Differential
The differential is simply the difference between your home's just (market) value and its assessed value at the time you leave. If your home's market value is $450,000 but your assessed value is only $285,000 thanks to years of Save Our Homes protection, your portable benefit is $165,000. Applied to a new $500,000 home, that would reduce its assessed value to $335,000 — trimming a meaningful chunk off your annual tax bill from day one.
Upsizing vs. Downsizing: The Math Is Different
When you move up to a home with an equal or greater market value than the one you're leaving, the calculation is straightforward: you can transfer the full SOH differential, up to the $500,000 cap. Moving from a $400,000 home assessed at $200,000 to a $500,000 home? Your $200,000 portable amount comes with you, and the new home starts with an assessed value of $300,000 instead of the full $500,000 market value.
Downsizing works differently. When your new home's market value is lower than your old home's market value, only a proportional share of the benefit transfers. The formula scales your SOH differential by the ratio of the new home's value to the old home's value. For example, if you move from a home valued at $300,000 down to one valued at $180,000, you can transfer 60% of your accumulated SOH benefit ($180,000 ÷ $300,000 = 60%). You don't lose the benefit entirely — you simply carry a proportionate slice of it forward. For seniors and retirees considering a smaller home or a condo, this is especially reassuring: downsizing no longer means starting from scratch at full market-value taxation.
The Three-Year Window
Florida voters approved an expansion of the portability window in November 2020, extending it from two years to three. That change took effect January 1, 2021. The clock starts from January 1 of the last year your homestead exemption was in place — not necessarily the date you sold. So if you sell your home at any point during 2026, the clock runs from January 1, 2026, giving you until January 1, 2029 to establish a new homestead and claim portability. If you moved out and abandoned your homestead in mid-2025 but didn't sell until 2026, the window begins from the abandonment year, not the sale year — a subtle but important distinction worth clarifying with your county property appraiser.
Applying: Form DR-501T and the March 1 Deadline
Portability is not automatic — you must apply for it. When you establish homestead at your new property, you'll file two forms with your new county's property appraiser: Form DR-501 (the standard homestead exemption application) and Form DR-501T (Transfer of Homestead Assessment Difference). Both must be submitted by March 1 of the tax year for which you want the benefit to apply. Miss that deadline and you may forfeit the savings you spent years building up.
The DR-501T has two main parts: one for your new homestead property and one for your previous homestead. You'll need the parcel ID or folio number from your former home — check your old TRIM notice or the prior county's property appraiser website if you don't have it handy. If you're moving between counties, your new property appraiser will coordinate with the old county to verify the benefit amount; the previous county issues a Certificate of Transfer that completes the process on their end. Many counties now offer online filing, making the whole process considerably easier than it once was. Keep a document organizer handy for your TRIM notices and property records — you'll want them at your fingertips.
A Few Details Worth Knowing
- You don't have to sell your old home first. All homesteaders on the previous property simply need to have abandoned it as a primary residence — the property itself doesn't need to be sold before portability becomes available.
- Co-owners and divorced spouses: If multiple people were on the homestead title, the portable benefit is generally divided equally unless a divorce decree specifies otherwise. To transfer 100% of the differential, all homesteaded owners of the previous property need to move to the new one.
- Portability can be used every time you move, as long as each move meets the eligibility requirements.
- The new homestead must be in Florida. Portability doesn't cross state lines.
- Your new home starts at full market value in year one — the SOH cap kicks in during the second year of your homestead exemption. The portable benefit, however, reduces your assessed value right from the start, which is where the real first-year savings show up.
Practical tip: Before you close on a new home, look up the property on your prospective county appraiser's website to see its current just value, then run the numbers using your known SOH differential. Many county appraisers offer free portability calculators online that let you model both the upsizing and downsizing scenarios in minutes. Deadlines, form versions, and online filing options can change, so always confirm the specifics directly with your new county's property appraiser office before you file — and if your benefit is substantial, consider a quick conversation with a Florida property tax attorney or CPA to make sure you're maximizing what you've earned.
