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Key Biscayne, Miami-dade County, Florida Property Taxes

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Property Taxes in Key Biscayne, Florida

  • Median Key Biscayne, Florida effective property tax rate: 1.34%, significantly higher than the national median of 1.02%, and higher than the Florida state median of 1.10%.

  • Median Key Biscayne, Florida home value: $1,190,595

  • Median annual Key Biscayne, Florida tax bill: $14,891, $12,491 higher than the national median property tax bill of $2,400.

How are property taxes in Miami-Dade calculated?

Property taxes in Key Biscayne, Florida are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.

Understanding Key Biscayne's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Key Biscayne, knowing local tax details benefits homeowners and investors.

Last Updated April 13, 2026

Key Biscayne, Miami-dade County, Florida Property Tax Bill Calculator

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

1.34%

Estimate Property Tax Bill

$15,954

$14,805

SAVE WITH OWNWELL

$774

Average Annual Tax Savings

How Does the Key Biscayne Property Tax Calculator Work?

Use this Key Biscayne property tax calculator to estimate your annual tax bill. Enter your property's assessed value and our calculator applies Key Biscayne's median effective tax rate of 1.34% — based on actual property records in Miami-Dade County — to generate your estimate.

Enter your property's estimated assessed value — the figure the local appraisal district uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Key Biscayne's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.

Your bill may vary by ZIP code within Key Biscayne: rates range from 1.34% in 33149 to 1.34% in 33149, primarily due to differences in school district levies and local assessment districts.

The median property tax bill is $14,891, which is higher than the Florida median property tax bill by $12,491. If your estimate is higher than expected, Ownwell can appeal your Key Biscayne assessment — you only pay if we save you money.

About Key Biscayne Property Taxes

About Property Taxes in Key Biscayne, Miami-Dade, Florida

Key Biscayne's median effective property tax rate of 1.34% is higher than the Florida state median of 1.10% and higher than the national median of 1.02%. This rate reflects the Miami-Dade County base levy combined with local school district levies and Municipal Service Benefit Units (MSBUs) that vary by subdivision throughout the city.

Property tax rates are not uniform across Key Biscayne. Homeowners in ZIP code 33149 carry a median effective rate of 1.34%, while those in 33149 pay 1.34%. This spread — 0 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across Miami-Dade County. Understanding which part of Key Biscayne you live in can make a meaningful difference to your annual tax bill.

Key Biscayne homeowners who believe their assessed value is too high can file a formal appeal with the local Property Appraiser before the September 16, 2026 deadline each year.

If your estimated bill above seems higher than expected, Ownwell can review your assessment and protest on your behalf. You only pay if we save you money.

Property Tax Rates Across Key Biscayne, Miami-dade County, Florida

As noted earlier, local government entities set tax rates, which can vary widely within a state.

Why? Because annually, each county estimates its required budget to provide services and divides that by the total value of all taxable property within its jurisdiction. This calculation results in the property tax rate.

While there are votes and laws involved in setting tax rates and budgets, in a nutshell, this is the annual process.

Below, you can compare Key Biscayne's effective property tax rate to other cities in Florida and the median property tax rates in Florida and the U.S.

Property Tax Rates Across Key Biscayne, Miami-dade County, Florida

Source: Ownwell

0.75%

1.45%

2.16%

Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.

Median Effective Key Biscayne Tax Rate

1.34%

Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.

Median Effective Miami-dade County Tax Rate

1.38%

Median Effective Florida Tax Rate

1.10%

Median Effective United States Tax Rate

1.02%

Property Tax Rates Across Key Biscayne, Miami-dade County, Florida

Zip10th Percentile25th PercentileMedian Tax Rate75th Percentile90th Percentile
331490.67%1.00%1.34%1.48%1.57%

Source: Ownwell

Property Tax Assessment Values Across Key Biscayne, Miami-dade County, Florida

When examining property taxes in Key Biscayne, Florida, understanding the distinction between "market value" and "assessed value" is crucial.

The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The Miami-Dade County appraisal district estimates the market value for tax purposes.

The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.

Assessment notices:

In Miami-Dade County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of August.

Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. For Key Biscayne, the median home price is $1,190,595, with tax bills ranging significantly across the county. ZIP code 33149 has the highest median home price at $1,190,595.

Property Tax Assessment Values Across Key Biscayne, Miami-dade County, Florida

Source: Ownwell

$162,312

$29,023,649

$57,884,986

Median Key Biscayne Market Value

$1,190,595

Median Miami-dade County Market Value

$420,480

Median Florida Market Value

$310,033

Median United States Market Value

$235,294

Property Tax Assessment Values Across Key Biscayne, Miami-dade County, Florida

Zip10th Percentile25th PercentileMedian Home Price75th Percentile90th Percentile
33149$537,240$829,252$1,190,595$2,421,801$3,675,211

Source: Ownwell

Property Tax Bills Across Key Biscayne, Miami-dade County, Florida

Property tax bills in Key Biscayne are based on the assessed value of a home, not its market price alone. Local tax rates are applied to that assessed value, and the final bill can also reflect exemptions and other local factors. With a median home price of $1,190,595, homeowners in this area often face substantial tax obligations, especially when assessed values rise.

What does this mean for homeowners? A higher assessed value can lead to a higher property tax bill, even if the home has not been sold. In Key Biscayne, property tax bills vary widely, with the 25th percentile at $9,003, the 75th percentile at $28,147, and the 90th percentile at $46,733. That is well above the national median property tax bill of $2,400.

Ownwell helps homeowners review their assessments, identify potential savings, and appeal unfair property tax bills. By challenging inaccurate assessments and finding eligible exemptions, Ownwell can help reduce what homeowners pay each year.

Property Tax Bills Across Key Biscayne, Miami-dade County, Florida

Source: Ownwell

$2,098

$248,335

$494,572

Median Key Biscayne Tax Bill

$14,891

Median Miami-dade County Tax Bill

$4,977

Median Florida Tax Bill

$3,263

Median United States Tax Bill

$2,400

Property Tax Bills Across Key Biscayne, Miami-dade County, Florida

Zip10th Percentile25th PercentileMedian Tax Bill75th Percentile90th Percentile
33149$5,974$9,003$14,891$28,147$46,733

Source: Ownwell

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Frequently Asked Property Tax Questions in Key Biscayne, Florida

How are property taxes calculated in Key Biscayne, Florida?
Property taxes in Key Biscayne, Florida are calculated by multiplying your property's assessed value by the applicable tax rate set by local taxing authorities. The assessed value is determined by the county assessor and may differ from your property's market value depending on local assessment ratios and exemptions.
How do I appeal my property taxes in Key Biscayne, Florida?
To appeal your property taxes in Key Biscayne, Florida, you typically need to file a formal protest or appeal with your local appraisal district or assessor's office by the stated deadline. You'll need evidence such as comparable sales, a recent independent appraisal, or documentation of property condition issues. Ownwell can handle this entire process for you.
What property tax exemptions are available in Key Biscayne, Florida?
Common property tax exemptions in Key Biscayne, Florida include homestead exemptions for primary residences, senior citizen exemptions, veteran exemptions, and disability exemptions. Exemption amounts and eligibility requirements vary by county. Contact your local appraisal district or check Ownwell for details specific to your property.
When are property taxes due in Key Biscayne, Florida?
Property tax deadlines in Key Biscayne, Florida vary by county but typically include an assessment notice period in spring or early summer, followed by an appeal deadline, and a tax payment due date in the fall or winter. Check with your county assessor's office for specific dates in your area.
How can Ownwell help reduce my property taxes in Key Biscayne, Florida?
Ownwell provides professional property tax appeal services in Key Biscayne, Florida. Our team analyzes your assessment, gathers evidence, files all paperwork, and represents you at hearings — all with no upfront cost. You only pay a percentage of your savings if we successfully lower your tax bill.