Why Your Miami Property Tax Bill Won’t Look Anything Like the Seller’s

There is a number on almost every listing that quietly misleads buyers, and it is not the price. It is the annual property tax figure.

That number is the current owner’s bill. If they have owned the home for fifteen years and lived in it as their primary residence, it may bear almost no relationship to what you will pay in your first full year of ownership. On a high-value Miami property, the gap between the two figures is regularly tens of thousands of dollars a year. Buyers who model the seller’s number into their carrying costs are not being careless. They are being reasonable, and the system is genuinely counterintuitive. Here is how it actually works.

The reset

Florida caps how fast a homesteaded property’s assessed value can rise. The Save Our Homes provision limits annual increases to 3 percent or the change in the Consumer Price Index, whichever is lower. For 2026 that figure came in at 2.7 percent.

Over a long ownership, this compounds into something remarkable. A Coral Gables home bought for $500,000 in 2008 and homesteaded since might carry a market value near $1.8 million today while its assessed value sits somewhere around $850,000. The owner has accumulated close to a million dollars of protection between what the home is worth and what it is taxed on. At Miami-Dade millage, that gap is worth something on the order of $18,000 to $20,000 a year to them.

None of it transfers to you. A change of ownership resets the assessed value to full market value. The Property Appraiser revalues the property as of January 1 following the sale, and your first full-year bill is calculated on that reset figure, not the seller’s protected one.

This is the single most common source of carrying-cost shock among out-of-state buyers in Miami, and it is entirely predictable if you know to look for it.

Doing the arithmetic yourself

The formula is simple. Annual tax equals taxable value multiplied by the millage rate, divided by 1,000. A mill is one dollar per thousand dollars of taxable value.

Combined millage in Miami-Dade generally runs somewhere between roughly 18 and 21 mills depending on the municipality, because the total stacks county, school board, city and any special district levies. Coral Gables, Bal Harbour, Miami Beach and unincorporated Miami-Dade all sit at different points in that range, and the spread is not trivial. Three mills of difference on a property with $2 million of taxable value is $6,000 a year, or $60,000 across a decade of ownership. A prestigious postcode does not guarantee a lower rate, and it is worth checking the specific jurisdiction rather than assuming.

One refinement: assessed value following a sale is set by the Property Appraiser under Florida’s mass-appraisal methodology and does not always land exactly at your purchase price. It is often somewhat below it. That is a helpful cushion, but not one to build a budget around.

Millage rates for the coming year are adopted by each jurisdiction in September, effective October 1, and reflected on the November bill. If you are buying now, you are modelling against rates that are about to be reset.

What homestead is actually worth

If the property will be your permanent primary residence, you can apply for the homestead exemption, and it does two things.

The first is a direct reduction in taxable value. For the 2026 tax year the maximum exemption is $51,411, made up of a $25,000 exemption that applies to all levies including school taxes, plus a second tier of $26,411 that applies only to non-school millage. That second tier used to be a flat $25,000; Amendment 5, approved by voters in November 2024, now indexes it to inflation annually, and it can only rise.

The second benefit is far more valuable over time: homestead status starts your own Save Our Homes cap running from the year after it is granted. On a multi-million dollar property in a rising market, that cap is worth vastly more over a ten-year hold than the exemption itself.

The application goes to the county Property Appraiser on Form DR-501, and the standard deadline is March 1 of the year you are claiming. You must own and occupy the property as your permanent residence as of January 1 of that tax year. Missing the deadline costs you a full year of both benefits, which is an expensive administrative oversight.

Portability, and who it does not help

If you are selling one Florida homestead and buying another, you can transfer your accumulated Save Our Homes differential to the new property. The transfer is capped at $500,000 of accumulated assessment difference, filed on Form DR-501T alongside your new homestead application. You have three tax years from abandoning the previous homestead to establish the new one.

This is a powerful benefit for existing Florida owners trading up, and it is one reason the local move-up market functions the way it does. It is also worth saying plainly: portability transfers a Florida benefit between Florida homes. A buyer arriving from New York, Chicago or California has nothing to port. You start fresh at market value.

The second-home position

If the Miami property will be a second home rather than your primary residence, the picture changes. Non-homestead property receives no homestead exemption, no 3 percent cap and no portability. It does get a separate assessment cap of 10 percent a year on the non-school portion, which offers some protection against runaway assessments but far less than homesteaded owners enjoy.

For buyers weighing whether to make Miami their primary residence, this differential is one of the larger financial variables in the decision, and it sits alongside the state income tax question rather than separately from it.

The vote in November, and the date attached to it

This is the part that is genuinely time-sensitive, and most buyers have not heard about it yet.

On June 2, 2026, the Florida Legislature passed HJR 1-F during a special session. It will appear on the November 3, 2026 ballot as Amendment 3, and it needs 60 percent approval to take effect. If it passes, it would replace the current homestead structure with a $25,000 exemption against school millage plus a much larger non-school exemption, phasing in at up to $150,000 in 2027 and up to $250,000 in 2028, with CPI adjustments from 2029. It would also reduce the assessment cap on non-homestead property from 10 percent to 5 percent, which matters considerably for second-home and investment buyers.

Here is the detail that should be on the radar of anyone currently planning a move to Florida. As drafted, residential owners who are permanent Florida residents as of December 31, 2026 would be eligible for the larger exemption amounts when they phase in. Those who establish Florida residency on or after January 1, 2027 would start at a lower new-resident exemption level and step up only after maintaining a Florida homestead for a period of years.

In other words, the timing of when you establish residency could carry real long-term value. The amendment has not passed yet, and nobody should restructure their life around a ballot measure that may fail. But if you were already planning to make the move, the calendar is worth discussing with your tax adviser now rather than in January.

Model your year one honestly

Before you write an offer, ask for three things: the property’s current assessed value and market value from the Property Appraiser’s records, the combined millage for that specific municipality, and an estimate of your own year-one bill calculated on a reset assessment. The Miami-Dade Property Appraiser publishes an estimator built on exactly this framework, and any competent agent should be running it for you unprompted.

Then add the non-ad valorem assessments, which appear on the same bill and are not captured by the millage calculation at all.

Chris King models year-one carrying costs on every property our buyers consider, including the tax reset, so the number in your budget is your number rather than the seller’s. If you are considering a Miami purchase and want to see the real arithmetic on a specific address, we are happy to run it.

This article is general information, not tax or legal advice. Exemption amounts, caps and ballot proposals change; confirm your position with a Florida CPA or attorney and the county Property Appraiser.