Renting vs buying in Bay Harbor Islands
Two islands in the bay, one residential and one commercial, by deliberate design since 1947. Here is the arithmetic of owning here rather than renting, on the millage actually charged, Florida's homestead exemption, and a condominium market reshaped by the law that followed Surfside, and then the part the arithmetic misses.
Calculator
The short answer
The typical home in Bay Harbor Islands was worth about $680,617 in June 2026, and a three-bedroom in this county asks roughly $4,096 a month. Both figures come from the same two Zillow indexes used for the Charlotte, Orlando and Palm Beach layers elsewhere on this site, in the same month, which is what makes all four comparable.
The millage is not the rate you pay. Bay Harbor Islands is charged 18.4810 mills, but a homesteaded buyer pays about $11,817 a year: the 1.74% used below, because $25,000 of taxable value comes off for every taxing authority and a second slice, indexed to inflation each 1 January since 2025, comes off for all of them except the school district. You file for it with the Palm Beach County Property Appraiser by 1 March of the year after you buy.
And then there is the insurance, which is the number that actually decides this. The $800 a month assumed here is $9,600 a year: a barrier-island estimate, well above the county average, because an address on the ocean side is the maximum windstorm and flood exposure case in the state outside the Keys. Flood is a separate compulsory policy on top of it. Tax and insurance together are $21,417 a year before a dollar of principal or interest. Replace the insurance figure with a real quote before you trust any result on this page; it moves the answer further than the mortgage rate does.
The seller's tax bill is not a guide to yours. Save Our Homes caps a homesteaded property's assessed value at 3% growth a year, and that cap resets to full market value the January after the sale, so a long-tenured owner can be taxed on a fraction of what you will be taxed on for the same house. Ask the property appraiser what the assessment would be at your purchase price, not what the current bill is.
And one thing that is different here from everywhere else in Florida. Miami-Dade is the only county in Florida where the deed tax is not 70 cents per $100. It is 60 cents, plus a 45-cent surtax that a transfer of a single-family dwelling does not pay, so a house is taxed at 0.6% and a condominium or townhouse at 1.05% on the same price. It is the seller's by convention either way, but it is priced into what a seller will accept, and in this county a great deal of what trades is not a single-family dwelling.
What this page cannot see. None of this includes a community development district assessment. A CDD is a special-purpose government that borrows to build a master-planned community's roads, drainage and amenities and repays the bonds through a non-ad-valorem line on your tax bill. Commonly $1,200 to $3,000 a year in the newer parts of Florida. It is in no millage, it is not in any figure here, and it is the first thing to check on a new-build address. Nor can it see a condominium association's reserve position, which in this county is the single largest financial risk attached to a purchase.
Your situation
Compare like for like: the rent on somewhere you would actually be willing to live, not the cheapest listing in the city. Drop the price to around $300,000 and the rent to a one-bedroom figure to compare apartments instead, and put the condo fee in under Assumptions.
20.0% down. The renter starts with this plus closing costs: $141,459: invested instead.
The single biggest lever. Buying costs a lot to enter and a lot to exit, and only time amortizes that away.
Assumptions: every one of them editable
Bay Harbor Islands's typical home value moved -2.2% in the year to June 2026. The 2% default is a long-run assumption rather than this market's recent experience: try both, and try zero.
What the renter earns on the down payment they never spent. This is the comparison's hidden lever. A renter who spends it instead of investing it does far worse than this model shows.
Florida forbids its counties and cities from controlling rents at all. The statute allowed a narrow exception (a declared housing emergency, a specific finding, and a referendum) and the legislature closed even that in 2023. There is no cap, no guideline and no prospect of one, so any rent-growth figure you enter here is a forecast rather than a legal ceiling.
Roofs, furnaces, fences, hail. Averaged out it is a real cost even in the years nothing breaks.
Zero for a single-family house. Where there is a condominium, $850 a month is a conservative figure for this county, and check the milestone inspection and the structural integrity reserve study first, because the law that requires them was written after the Champlain Towers South collapse in Surfside and the assessments that followed have run into six figures per unit.
Commission and legal fees, charged against the price you eventually sell at. The owner's net worth below is after this comes off.
Net worth, side by side
The buyer's line is home value minus what is still owed minus the cost of selling, plus anything they invested in months when owning was cheaper. The renter's line is one portfolio: the down payment and closing costs they never spent, plus the monthly difference whenever renting is cheaper.
Show the year-by-year figures
| Year | Owner | Renter | Difference |
|---|---|---|---|
| 1 | $113,281 | $171,581 | −$58,300 |
| 2 | $132,616 | $202,868 | −$70,252 |
| 3 | $152,645 | $235,374 | −$82,729 |
| 4 | $173,403 | $269,152 | −$95,750 |
| 5 | $194,927 | $304,263 | −$109,336 |
| 6 | $217,257 | $340,766 | −$123,510 |
| 7 | $240,433 | $378,726 | −$138,293 |
| 8 | $264,502 | $418,210 | −$153,708 |
| 9 | $289,510 | $459,288 | −$169,777 |
| 10 | $315,508 | $502,033 | −$186,525 |
| 11 | $342,548 | $546,525 | −$203,976 |
| 12 | $370,689 | $592,842 | −$222,154 |
| 13 | $399,989 | $641,072 | −$241,083 |
| 14 | $430,514 | $691,303 | −$260,789 |
| 15 | $462,332 | $743,629 | −$281,297 |
| 16 | $495,516 | $798,149 | −$302,633 |
| 17 | $530,142 | $854,965 | −$324,823 |
| 18 | $566,295 | $914,187 | −$347,892 |
| 19 | $604,060 | $975,927 | −$371,867 |
| 20 | $643,533 | $1,040,306 | −$396,772 |
| 21 | $684,813 | $1,107,447 | −$422,635 |
| 22 | $728,005 | $1,177,484 | −$449,479 |
| 23 | $773,222 | $1,250,552 | −$477,330 |
| 24 | $820,586 | $1,326,798 | −$506,213 |
| 25 | $870,224 | $1,406,374 | −$536,150 |
| 26 | $922,273 | $1,489,437 | −$567,164 |
| 27 | $976,879 | $1,576,156 | −$599,276 |
| 28 | $1,034,198 | $1,666,706 | −$632,508 |
| 29 | $1,094,394 | $1,761,271 | −$666,876 |
| 30 | $1,157,640 | $1,860,039 | −$702,399 |
- The rate is fixed for the life of the loan, so there is no renewal to model, but nothing here credits you for refinancing into a lower one either.
- Neither household is credited with tax on their investments, and the buyer's gain on a principal residence is tax-free while the renter's portfolio may not be.
An estimate from published figures, not a lender quote.
Questions people actually ask
Is it worth buying in Bay Harbor Islands right now?
The typical home in Bay Harbor Islands is worth about $680,617 and a three-bedroom in this county asks roughly $4,096 a month. At 6.67% on a 30-year fixed loan with 20% down, the mortgage is $3,503 a month; add about $985 in property tax and $800 in homeowners insurance and the owner's month is closer to $5,287. If what you are buying is a condominium (and in this county a great deal of what trades is) the association fee is a fourth number that belongs beside those three, and in Miami-Dade it has been the fastest-moving of the four since 2022.
Why is the tax rate on this page 1.74% when Bay Harbor Islands is charged 18.4810 mills?
About 1.74% of what you pay for the house, which is lower than the 18.4810 mills charged here, and the difference is Florida's homestead exemption rather than any assessment lag. The state assesses at full market value and a purchase resets the assessment to the price. What there is instead is an exemption: $25,000 of taxable value comes off for every taxing authority and a second slice comes off for all of them except the school district, which levies 6.4990 of the 18.4810. That second slice was $25,000 through the 2024 tax roll and has been adjusted for inflation every 1 January since, under the 2024 amendment to Article VII section 6 of the state constitution, so it is now somewhat more than $25,000. The figures here use the base amount, because the Department of Revenue sends the adjusted figure to the county property appraisers rather than publishing it. The difference is worth a few dollars a year on a bill, and the county property appraiser can tell you the amount in force. A homesteaded buyer's first-year bill is therefore about $11,817 on the $680,617 typical home value here. 2.3965 of those mills is the county's Fire Rescue district levy, which Bay Harbor Islands pays because it contracts the service rather than running its own department. The exemption is not automatic: you file for it with the Miami-Dade Property Appraiser by 1 March of the year after you buy. The seller's tax bill is not a guide to yours. Save Our Homes caps a homesteaded property's assessed value at 3% growth a year, and that cap resets to full market value the January after the sale, so a long-tenured owner can be taxed on a fraction of what you will be taxed on for the same house. Ask the property appraiser what the assessment would be at your purchase price, not what the current bill is.
What makes up the 18.4810 mills?
Four things, and only one of them is the municipality's own. Every incorporated address in Miami-Dade pays 12.3450 mills before anything else: the school district's 6.4990, a countywide 5.4549 covering county operating and debt and the Children's Trust, and 0.3911 for the regional water districts. Then the county library district's 0.2812 mills, which Bay Harbor Islands pays. Bay Harbor Islands's own levy is 3.4583. And then fire: 2.3965 mills to the county's Fire Rescue district, which Bay Harbor Islands pays because it contracts the service. For comparison, an address in the unincorporated county (where more than half of Miami-Dade actually lives) pays that base plus the Fire Rescue district plus a 1.909-mill Unincorporated Municipal Service Area levy in place of a city rate.
Why is the seller's tax bill so much lower than the figure here?
Save Our Homes. A homesteaded property's assessed value may rise no more than 3% a year (or the change in the consumer price index, whichever is lower) for as long as the same owner keeps the exemption, and it resets to full market value the January after a sale. On this $680,617 house the first-year bill is about $11,817; a neighbour who bought before the last decade's run-up may be paying a fraction of it for an identical property. If you already own a Florida homestead you can port up to $500,000 of the accrued benefit to the next one; if you are arriving from out of state or abroad, you cannot, and the figure on this page is yours.
Is the deed tax really different in Miami-Dade?
Yes, and it is the only county in Florida where it is. Miami-Dade is the only county in Florida where the deed tax is not 70 cents per $100. It is 60 cents, plus a 45-cent surtax that a transfer of a single-family dwelling does not pay, so a house is taxed at 0.6% and a condominium or townhouse at 1.05% on the same price. It is the seller's by convention either way, but it is priced into what a seller will accept, and in this county a great deal of what trades is not a single-family dwelling. On this $680,617 property the deed tax is $4,084 if it is a single-family dwelling and $7,146 if it is not. A difference of $3,063 at the same price. The buyer's own taxes are unaffected: the documentary stamp on the note at 0.35% and the intangible tax on the mortgage at 0.2% are charged statewide, and on a $544,493 loan come to $2,995.
What are the closing costs on a Bay Harbor Islands home?
The deed tax is the seller's by convention, so the buyer's side is the settlement fee at about $850, an owner's title policy, an inspection at about $700 (in Florida that usually means a general inspection plus wind mitigation and four-point reports the insurer will want) recording at about $90, and $2,995 in documentary stamp and intangible taxes on the loan itself. That is the $5,335 default above, before the lender's own charges. Note the loan taxes get larger the less you put down, which is unusual among closing costs.
How long do you have to stay for buying to beat renting in Bay Harbor Islands?
Getting in is about $5,335 and getting out roughly 6.1%: a 5.5% commission plus the seller's 0.6% deed tax, or about $41,518 on this property, and 0.45% more if it is not a single-family dwelling. The carrying cost is what moves the answer though: $21,417 a year in tax and insurance that a renter does not pay, plus an association fee if there is one. Put your own insurance quote and your own association fee into the calculator before you read anything into the crossover year.
Does Florida have rent control?
No, and Bay Harbor Islands is not permitted to introduce it. Florida forbids its counties and cities from controlling rents at all. The statute allowed a narrow exception (a declared housing emergency, a specific finding, and a referendum) and the legislature closed even that in 2023. There is no cap, no guideline and no prospect of one, so any rent-growth figure you enter here is a forecast rather than a legal ceiling. In this county that has bitten unusually hard: Miami-Dade rents rose faster than almost anywhere in the United States in the early 2020s and there was no statutory brake on any of it. The county has since used other instruments (tenant notice periods, its own affordable housing surtax program) but none of them is a cap.
What is this calculator not accounting for in Bay Harbor Islands?
Four things. Condominium reserves: Florida's 2022 legislation requires a milestone structural inspection and a fully funded structural integrity reserve study, and in this county (where the Champlain Towers South collapse in Surfside prompted the law) the resulting special assessments have run into six figures per unit. Nothing on this page models that. Insurance: the $800 a month here is a county-level estimate and your quote will turn on roof age, construction, opening protection and flood zone. None of this includes a community development district assessment. A CDD is a special-purpose government that borrows to build a master-planned community's roads, drainage and amenities and repays the bonds through a non-ad-valorem line on your tax bill. Commonly $1,200 to $3,000 a year in the newer parts of Florida. It is in no millage, it is not in any figure here, and it is the first thing to check on a new-build address. And the local variation: 9 miles from downtown Miami in a straight line is not a drive time: None., and a single figure for a municipality of 5,937 people averages over housing stock that in this county ranges from pre-war bungalows to towers finished last year. The seller's tax bill is not a guide to yours. Save Our Homes caps a homesteaded property's assessed value at 3% growth a year, and that cap resets to full market value the January after the sale, so a long-tenured owner can be taxed on a fraction of what you will be taxed on for the same house. Ask the property appraiser what the assessment would be at your purchase price, not what the current bill is.
Which figures here are estimates
The home values, rents and every component of the millage come from published sources, each listed below with the period it describes. These do not:
- Home insurance: $505 a month on the mainland and $800 on the barrier islands, against a Miami-Dade average of about $6,045 a year. It varies more by roof age, construction, opening protection and flood zone than by municipality, and it is the input most worth replacing with a real quote
- The condominium fee at $850 a month, which in this county is conservative and has been moving upward since Florida's 2022 milestone inspection and reserve legislation
- The split of rent by bedroom count, derived on the same ratios the other Florida layers use. The level is measured, the shape is assumed
- The rent in the two municipalities Zillow publishes no index for, which falls back to the median of the other twenty-two
- The utilities an owner pays over a renter, at $160 a month
- Maintenance at 1% of the home's value a year
- Every forward-looking rate: appreciation, rent growth, cost inflation and the return on the invested difference
- And nothing at all for a community development district assessment, which is less common here than in central Florida but not absent
If you want the payment side on its own. Prepayments, the month mortgage insurance stops, and the documentary stamp and intangible taxes Florida charges on the loan: the Bay Harbor Islands mortgage calculator covers it. To see how Bay Harbor Islands compares with the other twenty-three municipalities in this county, use the county comparison; Bay Harbor Islands is 9 miles from downtown Miami. For the same rules and the same indexes one county north, see Boca Raton and the Palm Beach coast.
Sources
- Zillow Home Value Index (ZHVI), all homes, mid-tier, smoothed and seasonally adjusted: city file, June 2026 · Zillow Research · retrieved Supports: A typical home value for the 35th to 65th percentile of each municipality's market, computed on one method across all twenty-four, The same series and month the Charlotte, Orlando and Palm Beach pages use, so all four American layers can be read against each other, Year-over-year change to June 2026
- Zillow Observed Rent Index (ZORI), all homes, smoothed: city file, June 2026 · Zillow Research · retrieved Supports: Asking rents across the whole rental stock for the twenty-two municipalities Zillow indexes
- Table 1: Comparison of Taxes Levied, county and municipal governments, fiscal years 2024-25 and 2025-26: Miami-Dade · Florida Department of Revenue, Property Tax Oversight · retrieved Supports: The adopted 2025-26 millage rate for Miami-Dade County and every municipality in it, The county's own components: countywide 4.5740, Fire/Rescue 2.3965, Library 0.2812 and the Unincorporated Municipal Service Area at 1.9090, Municipal rates from Sunny Isles Beach's 1.7000 to Biscayne Park's 9.3000
- 2025 millage rates and taxing authorities, Miami-Dade County · Miami-Dade County Property Appraiser · retrieved Supports: A published combined rate for unincorporated Miami-Dade of 16.9317 mills, Its components: school district 6.4990, countywide 5.7361, regional water districts 0.3911, Fire Rescue 2.3965 and UMSA 1.9090, which this layer's stack reproduces exactly, Millage code 0100, the City of Miami, at 19.9878 mills for 2025: 7.1080 of city operating levy and 0.2536 of city debt service on the countywide 12.6262, Opa-locka's municipal operating levy of 8.9797, and a 2025 total of 24.0024 for millage code 0800, A city debt service column, which nine of the twenty-four municipalities here carry: Miami 0.2536, Miami Beach 0.2779, North Bay Village 1.1666, Golden Beach 0.6000, Miami Shores 0.1331, North Miami Beach 0.2000, Miami Gardens 0.4331, Doral 0.4810 and Homestead 0.2446, A blank library district column for Hialeah, North Miami, North Miami Beach, Homestead, Miami Shores, Bal Harbour and Surfside, which are outside the county library district, A blank Fire Rescue column for Miami, Miami Beach, Coral Gables, Hialeah and Key Biscayne, which is the five this layer flags
- About Fire Rescue · Miami-Dade Fire Rescue · retrieved Supports: The Fire Rescue district covering the unincorporated county and twenty-nine municipalities, Miami, Miami Beach, Coral Gables, Hialeah and Key Biscayne operating their own fire departments and lying outside the district
- Documentary stamp tax · Florida Department of Revenue · retrieved Supports: A Miami-Dade deed rate of 60 cents per $100 rather than the 70 cents charged in every other county, A Miami-Dade surtax of 45 cents per $100, not due on a document transferring only a single-family dwelling, 35 cents per $100 on a promissory note, statewide
- Annual estimates of the resident population for incorporated places, 2020 to 2024 · United States Census Bureau, Population Estimates Program · retrieved Supports: 2020 census counts and 2024 estimates for each municipality, Miami at 487,014 and Hialeah at 235,388; Golden Beach at 1,034
- Average cost of home insurance in Florida, 2026 · MoneyGeek · retrieved Supports: A Miami-Dade County average of about $6,045 a year: below Palm Beach County's $6,614, A Florida average of about $3,815 and a national average of about $2,543
- Primary Mortgage Market Survey · Freddie Mac · retrieved Supports: 30-year fixed-rate mortgage averaging 6.67%
- Documentary stamp tax · Florida Department of Revenue · retrieved Supports: 70 cents per $100 on a deed, in every county except Miami-Dade, which charges 60 cents plus a 45-cent surtax, 35 cents per $100 on a promissory note or other written obligation to pay money
- Governmental leasehold intangible personal property tax and the non-recurring intangible tax on mortgages · Florida Department of Revenue · retrieved Supports: A non-recurring intangible tax of 2 mills: 0.2%, on the obligation secured by a mortgage on Florida real property
- Property tax exemptions and additional benefits · Florida Department of Revenue · retrieved Supports: A $25,000 homestead exemption applying to all taxing authorities and a second slice, $25,000 in the 2024 base year and adjusted for inflation each 1 January since, applying to all but the school district, The Save Our Homes assessment limitation of 3% or the change in CPI, whichever is lower, Portability of up to $500,000 of accrued Save Our Homes benefit to a new homestead, The 1 March filing deadline
- Chapter 2023-17, Laws of Florida: preemption of rent control · The Florida Senate · retrieved Supports: The repeal of the referendum exception that had allowed a local rent control ordinance in a declared housing emergency
These are estimates built from published figures, not a lender quote, a pre-approval or financial advice. Rates, premiums and state and federal rules change; confirm anything you plan to act on with a mortgage professional and read the sourcing methodology.