Key West, FL: Property Tax — What's Confirmed, and What Isn't

No State Income Tax, Same as the Rest of Florida

Florida has no state personal income tax, a real structural fact that applies in Key West exactly as it does in this site's other Florida markets, and one repeatedly cited across general cost-of-living and retirement-guide coverage as part of the state's broader pull on retirees and relocators moving from higher-tax states. It's worth naming plainly here for the same reason it matters everywhere else in Florida: property tax, not income tax, is where the state collects its share, which is exactly why the millage mechanics below deserve careful attention rather than an assumption that "no income tax" means "low taxes overall."

The Millage Rate We Could Not Confirm -- and Where the Real Sources Live

A Key West property tax bill is built from several layers stacked on top of each other: the City of Key West's own general fund millage (for property inside city limits), Monroe County's countywide general fund millage, the Monroe County School Board's millage, and any special-district assessments that apply to a specific parcel. This page cannot state a specific, current combined mill figure, or a specific current figure for any one of those layers, because the research behind this page could not independently confirm one against a fully-loaded primary source.

That's not for lack of trying to find the right sources. The City of Key West maintains its own dedicated "Millage Rate" page (cityofkeywest-fl.gov/1266/Millage-Rate), and the Monroe County Property Appraiser's office maintains its own dedicated "Millages" page (mcpafl.org/general-information/millages) -- both real, current, government-run pages that are exactly where a specific mill figure should come from. A direct attempt to load both pages during this research pass failed with a proxy error, the same tool-outage pattern this site's Key West research documented across an entire prior research session against Wikipedia, the National Hurricane Center, and multiple Monroe County and City of Key West government pages.

What search results did surface, at the level of a real, correctly-titled headline rather than a fully-read article: a keysnews.com report titled "Commission trims tax increase to 7.7%" describing Monroe County commissioners scaling back a preliminary countywide tax increase; a keysweekly.com headline, "SCHOOL BOARD ADOPTS TENTATIVE MILLAGE WITH TAX INCREASE," confirming the Monroe County School Board -- a separate taxing body from both the city and the county -- was independently moving its own millage upward in a recent budget cycle; and an atfkw.com headline, "BREAKING NEWS: Key West City Commission Tentatively Approves Budget at Rollback," suggesting the city commission at one point tentatively set its own rate at or near the "rollback rate" (the rate that would raise the same total revenue as the prior year, before accounting for new construction) for a recent fiscal year. None of these figures -- the exact percentage, the exact mill rate, or the exact fiscal year each applies to -- was confirmed via a fully-read primary source in this pass, and none should be treated as this year's settled rate.

A Flat, Reduced, or Rollback Rate Doesn't Mean a Falling Bill

A pattern this site has already documented in its other Florida markets applies here with at least as much force: a rate held at rollback, held flat, or even modestly reduced does not automatically mean a lower actual tax bill. The rollback rate itself is a revenue-neutral concept -- it holds total collections roughly level relative to the prior year -- but it's calculated against the prior year's tax roll, and rising assessed values on a specific property can still push that property's individual bill up even when the rate applied against the roll as a whole holds steady or drops. A buyer evaluating a specific Key West parcel should not assume a commission's rollback-rate vote translates into a flat bill for that property.

Florida's Homestead Exemption: The Same $50,000 Break, in Two Pieces

If a Key West or Monroe County property will be a buyer's permanent, primary residence, Florida's homestead exemption works exactly as it does everywhere else in the state. It's worth up to $50,000 total, split into two pieces: the first $25,000 applies to all levies, including school taxes, while a second $25,000 applies only to non-school levies, and only against the portion of assessed value between $50,000 and $75,000. In practice, the full $50,000 benefit only reaches its maximum value against the school-tax portion of a bill for a property assessed above $75,000 -- a threshold essentially every Key West home clears given this market's values and its documented land scarcity.

Florida requires homestead exemption applications by March 1 of the tax year for which the exemption is sought; missing that date generally means waiting until the following year. The Monroe County Property Appraiser's office maintains its own homestead-exemption filing resources as part of its dedicated site, a useful starting point for a property-specific application rather than relying on a generic statewide example.

Save Our Homes: The Assessment Cap, and Why It Matters on a Four-Mile Island

Once a property carries an active homestead exemption, Florida's Save Our Homes constitutional amendment caps how much its assessed value can rise each year going forward, limiting increases to whichever is lower: 3%, or the change in the Consumer Price Index. This is the identical statewide mechanic already documented for this site's other Florida markets, and it applies the same way in Monroe County -- there is no separate, weaker, or stronger local version of Save Our Homes in Key West.

The cap protects assessed value, not market value, so a homesteaded owner's tax bill can end up meaningfully lower than a comparable non-homesteaded neighbor's after several years of appreciation. That gap is likely to matter more in Key West than in a typical mainland Florida market: this site's research on Key West describes a market defined by extreme land scarcity on a roughly four-square-mile island and a state-mandated growth cap (ROGO, the Rate of Growth Ordinance) that constrains new supply -- conditions widely associated with sustained upward price pressure on existing homes. The benefit is also portable: a homeowner moving from one Florida homestead to another can carry a portion of their accumulated Save Our Homes benefit to a new property rather than starting over at full assessed value. As with the homestead exemption itself, Save Our Homes only attaches to a permanent, primary residence -- it does not apply to second homes, vacation rentals, or investment property.

Non-Homestead Property, and Why That Matters More in a Vacation-Rental Market

Non-homestead property in Florida -- second homes, seasonal residences, and investment property -- is instead subject to a separate, less generous 10% annual cap on assessed-value increases, applied automatically without an application, and that cap resets toward full market value whenever the property changes ownership. Neither the homestead exemption nor Save Our Homes applies to this category.

That distinction carries real weight in Key West specifically. This site's research on the market describes Key West as having genuinely restrictive short-term-rental rules -- transient rentals are generally limited to specifically licensed or zoned properties, with a capped, citywide pool of transient rental licenses -- and a dense secondary market exists for buying a unit that already carries a valid license. A buyer purchasing a non-homesteaded property specifically for short-term-rental income should budget for taxable value tracking closer to actual market appreciation than a homesteaded neighbor's capped assessment, and should not assume a seller's current tax bill -- which may reflect years of an existing homestead exemption, or may already reflect non-homestead treatment -- will resemble their own bill after a sale resets the assessment.

Property Tax Is Only One Layer of Carrying Cost Here

Millage rates and exemptions are what this page covers, but they are not the whole ownership-cost picture in Key West, and it would be misleading to imply otherwise. This site's Key West research documents Monroe County's low average elevation as the widely-cited reason the Keys carry some of the highest flood-insurance costs in the country, and separately documents real, elevation-driven building-code requirements (substantial-improvement rules that can require elevating an entire older structure once a renovation crosses a set cost threshold) that can add significant, non-tax cost to owning or renovating a Key West home. Neither a specific current flood-insurance premium figure nor a specific substantial-improvement cost threshold was confirmed via a fetched primary source in that research pass, and none is stated here -- that's covered, and its own gaps are disclosed, on this site's coastal-insurance and flood-zones pages, not this one. The point for a property tax page to make honestly: judge a Key West purchase by total carrying cost, not by the millage line alone.

What This Page Does Not State, and Why

This page deliberately does not state a current City of Key West general fund millage, a current Monroe County countywide millage, a current Monroe County School Board millage, a combined total mill rate for any specific parcel, or an effective tax-rate percentage of home value, because none of those figures were confirmed against a fully-loaded City of Key West, Monroe County Property Appraiser, or Truth-in-Millage (TRIM) document in the research behind this page. That's a real, disclosed gap, not an oversight -- get a direct confirmation pass against the primary sources named above, or against a specific parcel's own TRIM notice, before budgeting a Key West tax bill.