Key Biscayne, Florida · public appraisal records
Are you overpaying property taxes in Key Biscayne?
We analyzed 1,283 homes in Key Biscayne, Florida against comparable homes in the same ZIP. About 29.2% are assessed more than 15% above the typical comparable home, an estimated $26K a year each in property-tax overpayment. Is yours one of them?
That's 6.3 points lower than the 35.5% average across the 453 Florida cities we analyzed, Key Biscayne ranks #365 of 453 for over-assessment.
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Key Biscayne TRIM season: your county mails its Truth-in-Millage notice in August. You then have 25 days, until about September 15, 2026, to file a Form DR-486 petition with the Value Adjustment Board. Check your just value now so your evidence is ready.
Where over-assessment clusters in Key Biscayne
Streets in Key Biscayne with the most homes assessed above comparable homes nearby. We show the street and a count only, never a specific address or owner. Enter your address below to see if yours is one of them.
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Free instant analysis against comparable homes in Key Biscayne. No signup. About 30 seconds.
Check my Key Biscayne home, freeHow we measured this
We compared every single-family home in Key Biscayne to the median comparable home in the same ZIP, using public county just (market) value from the Florida DOR roll, the value a §194.011 VAB petition actually challenges, not the Save Our Homes-capped assessed value, and counted a home as over-assessed when it sits more than 15% above that median. This is a city-level screen, it shows where over-assessment is common, not whether any specific home is over-assessed. See the full nationwide methodology and ranking. Data as of July 2026.
Other Florida cities we analyzed
Frequently asked
How many homes in Key Biscayne, Florida are over-assessed?
About 29.2% of single-family homes in Key Biscayne, roughly 375 of the 1,283 we analyzed, are assessed more than 15% above the typical comparable home in the same ZIP. That's 6.3 points lower than the 35.5% average across the 453 Florida cities we analyzed, Key Biscayne ranks #365 of 453 for over-assessment. The average over-assessed home in Key Biscayne sits about 101.6% above its comparables, an estimated $26K a year in property-tax overpayment.
Which streets in Key Biscayne have the most over-assessed homes?
Among the homes we analyzed in Key Biscayne, over-assessment clusters most on Island Dr (51 homes), Harbor Dr (42 homes), S Mashta Dr (28 homes). We publish the street and a count only, never a specific address, enter your own address to see whether yours is assessed above comparable homes nearby.
How do I appeal my property taxes in Key Biscayne, Florida?
Your county property appraiser mails a TRIM (Truth in Millage) notice in mid-to-late August showing your home's proposed just (market) value. You then have 25 days, most 2026 deadlines land around September 15, to file a Form DR-486 petition with your county Value Adjustment Board (VAB), for a $15 filing fee per parcel. Under Florida Statute §194.011 the petition challenges your just value, so comparable sales that value your home below the appraiser's figure are the evidence that wins. AppealMyTax builds that pre-filled VAB petition kit for your Key Biscayne home for $49 flat, sign and file in about 5 minutes, and you keep 100% of any savings.
When is the Key Biscayne property tax appeal deadline?
25 days after your county mails its TRIM notice, which for most Florida counties means mid-September (around September 15, 2026). The Clerk of the Value Adjustment Board must physically receive your DR-486 petition by the deadline, a postmark does not count, so file a few days early. Miss it and you wait a full year for the next window.
Is it worth appealing in Key Biscayne if I have a homestead exemption?
Often yes. Winning a lower just value can cut this year's bill, and for a homesteaded home that lower value then becomes the base your 3% Save Our Homes cap grows from, so a single Key Biscayne win compounds over every year you own the home. Non-homesteaded homes (rentals, second homes, recent purchases) tend to see the largest immediate reduction because their assessed value tracks market value directly.
Does living in Key Biscayne mean my home is over-assessed?
Not necessarily. This is a city-level screen built from public appraisal records, it shows where over-assessment is common, not whether your specific home is over-assessed. The only way to know is a per-home comparison against similar properties nearby, which our free address check does in about 30 seconds.