Have you heard of Florida homestead portability? If you have owned and homesteaded a Florida home for more than a few years, you are almost certainly sitting on a Save Our Homes assessment differential — the gap between what the county says your house is worth and the much smaller number it is actually allowed to tax.
That differential is one of the largest and least-understood assets attached to long-tenured Florida homeownership. And it does not have to stay behind with the house you are selling.
Since Amendment 1 took effect in 2008, Florida law has allowed a homesteaded owner to carry that accumulated differential forward to the next Florida homestead. Keep in mind that the transfer is never automatic — it takes a separate form, filed inside a window that closes faster than most sellers expect.
What's more, the size of the differential you carry changes the property-tax figure your lender loads into the escrow analysis, which in turn changes the debt-to-income ratio underwriting uses to qualify you. That makes portability a mortgage question at least as much as a tax question, and it belongs in the conversation well before you sign a purchase contract.
Florida homestead portability transfers up to $500,000 of your Save Our Homes assessment differential to a new Florida homestead. You must establish the new homestead within three tax years of abandoning the old one.
What Is The Save Our Homes Cap?
Save Our Homes is the constitutional assessment limitation found in Article VII, Section 4 of the Florida Constitution and implemented in Florida Statutes § 193.155. Once a homestead exemption is in place, it limits the annual increase in your property's assessed value to 3% or the change in the Consumer Price Index, whichever is lower.
Note that the cap governs assessed value, not market value. Your county property appraiser keeps tracking just value — the market number — every January 1, while assessed value creeps upward slowly behind it.
The distance between those two numbers is your assessment differential, and it compounds year over year. In periods when Florida values climbed sharply, the CPI-limited cap ran at or just below its 3% ceiling while just values moved several times faster, which is precisely how six-figure differentials accumulate on ordinary houses.
Be aware that the cap resets the moment a property changes hands. A new owner is assessed at full just value on the January 1 following the sale, which is why a buyer's tax bill so often bears no resemblance to the seller's.
There is also a recapture provision, set out in the Department of Revenue's administrative rules, that works in the other direction. Even in a year when just value falls, assessed value still rises by the lesser of 3% or CPI until the two figures meet — so a soft market does not pause the climb.
The Save Our Homes differential is the gap between your home's just value and its capped assessed value. It grows in any year market value rises faster than the 3% or CPI limit, and it compounds.
What Is Homestead Portability, Exactly?
Portability is the statutory right to move your accumulated Save Our Homes differential from an abandoned Florida homestead to a new one. The mechanism is a subtraction: your new home's just value minus the transferred differential equals your new assessed value, before any homestead exemptions are applied.
The homestead exemption itself is a separate benefit that stacks on top. The first $25,000 applies to all taxing authorities including school districts, while a second tier applies to assessed value above $50,000 and is excluded from school levies.
Portability, by contrast, works at the assessment level rather than the exemption level, so it reduces the base that every taxing authority levies against — including schools. That is why a large differential is worth considerably more per dollar than an additional exemption of the same size.
Once the transferred differential lands on the new property, the 3% or CPI cap picks up again from that lower assessed value. In other words, you do not merely get a one-year discount; you restart the compounding from a lower base.
How Long Do I Have To Transfer The Cap?
The window is three tax years, and it is anchored to January 1 rather than to your closing date. Specifically, you must establish the new homestead as of January 1 of one of the three years immediately following the last January 1 on which you received the exemption on the prior home.
That three-year window is itself relatively recent. Florida voters extended it from two years to three by constitutional amendment effective in 2021, which quietly rescued a great many sellers who had been squeezed by construction delays and inventory shortages.
Note that the calendar math punishes late-year sellers and rewards planners. A seller who abandons a homestead in November has effectively spent a year of the window before the moving truck arrives, because the clock counts tax years, not months.
Timing anchor. Suppose you claimed the homestead exemption on your old house for the 2026 tax year and sold it in 2026. You would need to establish and qualify for a new Florida homestead as of January 1 of 2027, 2028, or 2029.
Miss the third January 1 and the differential does not shrink or partially survive — it disappears entirely. Confirm your specific dates with the county property appraiser in the county where the new home sits, because the qualifying facts are determined locally.
The new homestead must be established by January 1 of one of the three years following the last year you claimed the old exemption. Miss that window and the differential is gone permanently.
How The Math Works When You Trade Up
Upsizing is the simple case. If the new home's just value is equal to or greater than the old home's just value, you transfer the entire differential, subject only to the $500,000 statutory ceiling.
Consider an owner whose old home carried a just value of $520,000 and an assessed value of $310,000. The differential is $210,000, and it moves in full.
Buying a new Florida homestead with a just value of $700,000, that owner's new assessed value would be $700,000 minus $210,000, or $490,000. Homestead exemptions then come off that figure before the millage rate is applied.
Combined millage in Florida commonly runs somewhere in the range of roughly 15 to 22 mills depending on county, municipality, and special districts, so the 18 mills used in the examples below is illustrative rather than a quote for your address. At that illustrative rate, $210,000 of transferred differential is worth about $3,780 a year, or roughly $315 a month.
That $315 is not a rebate you receive at the end of the year. It is a line item that never enters your monthly escrow in the first place, which is the part that matters to a lender.
If the new home's just value equals or exceeds the old home's, you transfer the full differential up to $500,000. Your new assessed value is just value minus that amount.
How The Math Works When You Downsize
Downsizing uses a proportional formula instead, which is where most homeowners guess wrong. You do not carry the full differential to a cheaper house; you carry the same percentage of assessment reduction you enjoyed before.
The calculation is straightforward. Divide the new home's just value by the old home's just value, then multiply that ratio by your old differential.
Take an owner with an old just value of $700,000 and an old assessed value of $420,000, for a differential of $280,000 — a 40% reduction. Moving to a home with a just value of $450,000, the ratio is $450,000 divided by $700,000, or about 64.3%.
Multiply 64.3% by $280,000 and the transferred differential is roughly $180,000. The new assessed value becomes $450,000 minus $180,000, or $270,000, which preserves the original 40% discount exactly.
At the same illustrative 18 mills, that $180,000 is worth about $3,240 a year against the tax bill of a buyer with no differential at all. The following table sets the two rules side by side.
| Scenario | Rule applied | Amount transferred | Practical effect |
|---|---|---|---|
| Upsize (new just value at or above old) | Full differential, capped at $500,000 | Entire differential | Dollar-for-dollar reduction of the new assessment |
| Downsize (new just value below old) | New just value ÷ old just value × old differential | Proportional share | Same percentage discount, smaller dollar amount |
| Very large differential | $500,000 statutory ceiling | Capped at $500,000 | Amounts above the ceiling are forfeited |
All of the above is why downsizing decisions in Florida deserve a portability calculation before a listing decision, not after. The proportional rule can quietly convert what looked like a large tax saving into a modest one.
Downsizing transfers a proportional share. Divide new just value by old just value, multiply by the old differential, and that is what you carry — so your percentage discount stays the same.
The $500,000 Ceiling And Split Ownership
Florida caps the transferred assessment differential at $500,000. Owners in long-held coastal and infill properties can exceed that ceiling, and the excess is simply not portable.
Joint ownership adds a second layer. When two or more people owned the abandoned homestead — most commonly spouses, but also siblings or unmarried co-owners — each owner has a share of the differential, and the county needs to know how that share is allocated.
Florida's Form DR-501TS, the Designation of Ownership Shares of Abandoned Homestead, exists for exactly this purpose. Filing it lets co-owners specify who carries what, which matters enormously when two people are separating and buying two new homesteads.
Remember that these are legal determinations made by your county property appraiser on the specific facts of title, marriage, and occupancy. If ownership is anything other than a single individual moving from one house to one house, get the allocation confirmed in writing before you close.
How Portability Changes The Escrow Line Your Lender Uses
Here is the part that rarely makes it into a tax explainer. Your lender is going to estimate the annual property-tax bill on the new home, divide it by twelve, and carry that number in both your monthly payment and your debt-to-income ratio.
The trouble is that lenders arrive at that estimate several different ways, and two of them are wrong for a Florida buyer using portability. Some default to the prior year's actual tax bill pulled from the county, which reflects the seller's capped assessment and badly understates your future obligation.
Others apply a flat percentage of the purchase price — often somewhere between 1.5% and 2.0% in Florida — which assumes no differential at all and overstates your obligation if you are porting a large one. Only the third approach, running the portability-adjusted assessment through the actual millage for that parcel, produces a number that matches reality.
The table below shows how far apart those three methods land on the $700,000 purchase from the upsize example, using the same illustrative 18 mills and a combined $50,000 of homestead exemption.
| Tax estimate method | Assessment used | Approx. annual tax | Approx. monthly escrow |
|---|---|---|---|
| Seller's prior-year bill | $340,000 (seller's capped value) | $5,220 | $435 |
| Full just value, no portability | $700,000 | $11,700 | $975 |
| Full just value with $210,000 ported | $490,000 | $7,920 | $660 |
The spread between the top and bottom rows is $540 a month on the same house. That is the difference between an approval and a decline for a borrower sitting near a debt-to-income ceiling.
Run it the other direction and the effect is just as concrete. At an illustrative note rate near 7% — published averages move constantly, and your actual rate depends on credit score, loan-to-value, and term — the $315 monthly saving from portability supports roughly $45,000 to $50,000 of additional loan amount within the same qualifying ratio.
There is a timing wrinkle too, and it produces the classic Florida escrow shortage letter. Because assessments are set as of January 1, a buyer who closes in June is generally billed that November on the assessment that existed the preceding January 1, with the reset and the portability adjustment both landing the following January 1.
Accordingly, a lender who escrows year one off the seller's old bill will collect too little, then issue a shortage notice and a payment increase in year two. Ask for the escrow analysis assumptions in writing, and if the number came from the seller's bill, ask underwriting to rerun it. Our Florida mortgage guide walks through how the rest of the payment stack — principal, interest, insurance, and any association dues — assembles around that escrow figure.
Keep in mind that property taxes are only one of two escrow lines moving hard in Florida right now. The homeowners insurance affordability squeeze can swamp a portability saving on the same closing statement, so model both lines together rather than in isolation.
Portability lowers the assessed value your tax escrow is calculated on, which lowers PITI and the debt-to-income ratio underwriting uses. Ask your lender which tax figure they used.
How To File For Portability In Florida
Portability requires an affirmative filing with the county property appraiser where the new homestead is located, and it is filed alongside — not instead of — your homestead exemption application. Here is a list of the steps involved:
- Abandon the prior homestead. Notify the property appraiser in the county where the old home sat that you have abandoned the homestead. Some counties handle this automatically on transfer of title, and others expect written notice, so confirm rather than assume.
- File Form DR-501. This is the original application for homestead exemption on the new property, and portability cannot exist without an approved homestead on the new home.
- File Form DR-501T. Titled Transfer of Homestead Assessment Difference, this is the actual portability form. It asks for the prior property's address, parcel identification, county, and the year you last received the exemption there.
- File Form DR-501TS if ownership was shared. The Designation of Ownership Shares of Abandoned Homestead allocates the differential among co-owners. Skipping it when it applies is one of the more common reasons a transfer comes back smaller than expected.
- Meet the March 1 deadline. Applications are due by March 1 of the tax year in which you are claiming the benefit. Filing in January or February of the qualifying year is the safest practice.
- Read the TRIM notice in August. Your Notice of Proposed Property Taxes shows the assessed value the appraiser actually used. If the differential is missing or wrong, you generally have 25 days from the mailing date to petition the Value Adjustment Board.
Most Florida county property appraiser offices publish a portability estimator on their websites, and the printout from that estimator is the single most useful document you can hand a loan officer. Deliver it before underwriting locks the tax figure, not after the closing disclosure is issued.
Where Portability Will Not Help You
Portability is narrower than its reputation, and several common assumptions about it are simply incorrect. Some of the limits worth knowing include:
- Florida-to-Florida only. A differential must have been earned on a prior Florida homestead. An assessment cap or exemption from another state does not travel with you.
- Homestead property only. Second homes, rentals, and investment property do not generate a portable differential. Those properties fall under a separate 10% non-homestead assessment limitation that excludes school district levies and does not transfer.
- No partial rescue after the window. The three-year rule is a cliff, not a slope. There is no reduced transfer for a homeowner who files in year four.
- The ceiling is absolute. Differentials above $500,000 lose the excess permanently, which is a real consideration for owners of long-held high-value properties.
- It does not stop the recapture rule. Your new assessed value will still climb by the lesser of 3% or CPI each year, even in a year when just value flattens or declines.
All of these limits point the same direction: portability rewards sequencing. A homeowner who knows the window, the formula, and the filing dates before listing keeps a benefit that a homeowner who learns about it at the closing table has often already forfeited.
The same sequencing logic applies to the loan itself. If you are weighing whether to keep the old property rather than sell it, note that abandoning the homestead is what starts the portability clock, and our discussion of the mortgage rate lock-in effect covers the competing pull of a below-market note. Buyers purchasing a unit rather than a single-family home should also review Florida condo financing requirements, since a condominium can qualify as a homestead while still facing lender-side hurdles that have nothing to do with taxes.
Frequently Asked Questions
How long do I have to use Florida homestead portability?
You must establish the new homestead within three tax years of the last year you received the exemption on the old one. File Form DR-501T with Form DR-501 by March 1 of the year you claim it.
What happens to my portability if I downsize?
You transfer a proportional share, not the full differential. Divide the new just value by the old just value, then multiply that ratio by your old differential to get the amount you carry.
Does portability work if I move to Florida from another state?
No. Portability only transfers a Save Our Homes differential earned on a prior Florida homestead. An out-of-state assessment cap or exemption does not follow you into Florida.
How much can I transfer with Florida homestead portability?
The transferred assessment differential is capped at $500,000. If you upsize, you carry the full differential up to that ceiling; if you downsize, the proportional formula usually lands below it.
Why is my Florida property tax bill higher than the seller's?
The Save Our Homes cap resets when a property sells. Your assessment is set at full just value the January 1 after closing, so a long-tenured seller's capped bill understates what you will owe.
Does portability lower the escrow payment my lender qualifies me on?
It can, if underwriting uses the portability-adjusted assessment instead of full just value. Give your loan officer the county property appraiser's portability estimate before the tax figure is locked.
Putting The Differential To Work
A Save Our Homes differential is real, transferable, and quantifiable, and it behaves far more like an asset on your balance sheet than like a line on a tax bill. Treating it that way — calculating it, protecting the filing window, and handing the number to your lender early — is what converts it from a tax curiosity into borrowing capacity.
If you are comparing Florida against other markets, it is worth seeing how differently states structure this protection; Indiana's constitutional property tax caps take a circuit-breaker approach rather than an assessment-growth approach, with very different consequences for a long-term owner. And for readers thinking past the next purchase, our piece on turning home equity into generational wealth covers how capped assessments compound alongside principal paydown over a full ownership cycle.
Before you list or write an offer, pull the portability estimate from your county property appraiser and ask your loan officer, in writing, which tax figure the file is using. Those two documents cost nothing and routinely change the size of the loan you qualify for.
This article is for informational purposes and is not financial, mortgage, tax, or legal advice. Property tax determinations are made by your county property appraiser under Florida law, and figures shown here are illustrative — consult a licensed professional in your jurisdiction.