The call comes in every January. A client I helped buy a home in the fall calls with something like: "Marie, I just got my property tax bill. I thought you said it was around $8,000 a year. This says $14,000."
I understand the shock. And I've had this conversation enough times that I've gotten good at explaining exactly why it happens. Miami property taxes have a quirk that catches almost every out-of-state buyer off guard, and even plenty of locals who haven't bought recently.
How Miami-Dade Property Taxes Are Calculated
Miami property taxes are calculated by multiplying your assessed value (after exemptions) by a millage rate. One mill equals $1 per $1,000 of taxable value. The millage rate you pay is actually a combination of layers: Miami-Dade County general services, the school board, your city's municipal rate if you live in an incorporated area, and several special district levies for fire, library, and water management.
Add it all up and total millage in Miami-Dade runs roughly 19 to 23 mills depending on your exact location. On a taxable value of $500,000 at 21 mills, that's $10,500 a year before any exemptions.
You can look up your assessed value and tax history on the Miami-Dade Property Appraiser's website. It's public information and worth checking before you make an offer on any property.
Why New Buyers Pay More Than the Seller Did
Here's the part that shocks people. When you buy a home in Florida, the county resets the assessed value to the purchase price in your first year of ownership. No Save Our Homes protection yet. No partial-year benefit. You're taxed on market value from day one.
The seller might have owned the home for 15 years and had their assessed value capped well below market. Their tax bill was calculated on $350,000 even though the home just sold for $700,000. Yours will be calculated on $700,000 minus whatever exemptions you qualify for. Same house, very different tax bills.
This is one of the most important conversations I have with buyers before closing. I pull the seller's current assessed value and compare it to the purchase price so clients know exactly what to expect in year one. There should be no surprises. But there are, regularly, when buyers haven't had that conversation.
The Homestead Exemption
If you're buying a primary residence, apply for the Homestead Exemption. The deadline is March 1 of the year you want it to apply. It's free and it's one of the most valuable things a new Florida homeowner can do.
The exemption works in two layers. The first $25,000 reduces your assessed value for all taxes, including school taxes. A second $25,000 applies to the portion of value between $50,000 and $75,000, but only for non-school taxes. The practical effect for most homeowners: savings of $800 to $1,500 per year. Good, but the real value of Homestead is what comes attached to it.
Apply through the Miami-Dade Property Appraiser's office. You'll need a Florida driver's license, a Florida vehicle registration, and confirmation that this is your primary residence. The process is straightforward and can be done online.
Save Our Homes: The Cap That Saves Real Money
Once you have Homestead Exemption, your assessed value is capped. It can only increase by 3% per year or the Consumer Price Index, whichever is lower. In years with strong property value appreciation, this cap is worth far more than the base exemption.
Say you buy a home for $600,000 in 2026 and values in your neighborhood rise 7% a year for five years. Without the cap, your assessable value approaches $840,000 by 2031. With Save Our Homes, it stays around $696,000. The difference in your annual tax bill at that point is around $3,000 per year. Over 15 years of ownership, this protection can save you $30,000 or more. That's real money.
This is why longtime homeowners in Miami often pay far less in property taxes than someone who just bought a similar house next door. The Save Our Homes differential builds steadily over time.
Non-Homesteaded Properties: A Different Story
Investment properties, vacation homes, and second residences don't qualify for Homestead or Save Our Homes. The county assesses them at full market value every year, with no cap on increases.
This matters for buyers of rental properties in particular. An investor who's owned a building for 20 years might be paying taxes on an assessed value that's a fraction of today's market. The moment you buy it, the clock resets. Rental income projections need to account for your actual first-year tax exposure, not the seller's comfortable grandfathered rate.
Portability: Take Your Savings With You
Florida allows homeowners to transfer their Save Our Homes benefit when they move to a new primary residence in-state. You can transfer up to $500,000 of accumulated differential to the new property.
Say your old home was assessed at $350,000 but sold for $800,000. That $450,000 gap is your portability amount. When you buy your next Florida home, you can apply that benefit to reduce the new property's assessed value from day one. But you have three years after giving up your last homestead to claim it on a new one. Miss the window and it's gone permanently.
I make sure every client who's moving within Florida knows about portability before they list their current home. It changes the math on what they can afford in the next purchase.
The Common First-Year Surprises
| Surprise | What Actually Happens |
|---|---|
| November tax bill arrives | Bills go out in November. Pay in November and get a 4% discount; due March 31 at full amount. |
| Escrow shortage in year 1 | Lender used seller's assessed value to estimate your escrow. Your actual bill will likely be higher. |
| Missed Homestead deadline | March 1 is absolute. Miss it and you wait a full calendar year. |
| TRIM notice in August | County sends proposed assessment. You have a short window to appeal if the number is too high. |
| Special assessment line items | Some properties carry additional district levies that aren't obvious before closing. |
The November early-pay discount is real money. A 4% discount on a $12,000 tax bill is $480 saved by writing one check in November instead of March. Most homeowners with mortgage escrow accounts don't see this benefit because the lender pays automatically, but if you pay your own taxes, mark your calendar.
The escrow adjustment confuses people most. Your lender estimates your escrow at closing based on the current assessed value, which is the seller's number, often well below what you paid. When the county reassesses at your purchase price, the real bill is higher. Your lender will notify you of a shortage in year one and adjust your monthly payment to catch up. Not a penalty. Just the system doing its math with better inputs.
If you're buying in Miami and want to understand what year-one costs actually look like, use the calculator on our site or reach out directly and we'll run real numbers for your specific situation.