Key Biscayne, FL

Very High · 303

Florida · Population 14,560 · Updated March 2026

$3,501
Median Rent / Month
$172,604
Median Income
$1,238,700
Median Home Value
$3,796
Owner Costs / Month

Affordability

How far your income goes in Key Biscayne

24.3%
Rent-to-Income Ratio
Affordable
Rent takes less than 25% of median income — considered affordable by HUD standards.

Tax Burden in Florida

State-level tax rates that affect your costs

0%
Income Tax (Top Rate)
6.0%
Sales Tax
0.86%
Property Tax Rate

Estimated Annual Costs

$42,012
Annual Rent
$0
State Income Tax
$10,653
Property Tax (est.)

Cost of Living Overview

Key Biscayne has a significantly higher cost of living than most US cities, driven largely by premium housing costs. With a cost index of 303 (where 100 equals the national median), Key Biscayne residents can expect to pay median rent of $3,501/month while earning a median household income of $172,604/year.

The median home value in Key Biscayne, FL is $1,238,700, with typical monthly owner costs around $3,796 including mortgage, insurance, and taxes. The median rent-to-income ratio of 24.3% means housing is relatively affordable here — well below the 30% threshold that HUD considers cost-burdened.

Florida has no state income tax, which can represent significant savings compared to high-tax states. Combined with a 6.0% sales tax rate and 0.86% effective property tax rate, the overall tax environment helps keep costs manageable in Key Biscayne.

Frequently Asked Questions

Common questions about living costs in Key Biscayne

What is the cost of living in Key Biscayne, FL?
The cost of living index in Key Biscayne, FL is 303 (US average = 100). Median monthly rent is $3,501, median household income is $172,604/year, and the median home value is $1,238,700.
Is Key Biscayne, FL affordable?
No, Key Biscayne is more expensive than the national average with a cost index of 303. The rent-to-income ratio is 24.3%—below the 30%% threshold considered affordable by HUD.
What is the average rent in Key Biscayne, FL?
The median gross rent in Key Biscayne, FL is $3,501 per month according to the US Census Bureau ACS 2023 data. Annual rent costs approximately $42,012.
What is the median household income in Key Biscayne?
The median household income in Key Biscayne, FL is $172,604 per year. This compares to the national median of approximately $80,000.
What are the taxes like in Florida?
Florida has a top income tax rate of 0%, a sales tax of 6.0%, and an effective property tax rate of 0.86%. Notably, there is no state income tax.