Street Economics

Martin County, Florida

HJR 1 Homestead-Exemption Tax-Base Exposure

Martin County . 2025 final assessment roll

Snapshot

The Martin County read

Martin County fits the Bedroom Residential Monoculture archetype. The base is owner-occupied single-family housing at moderate value with thin commercial, industrial, or rental property. This is the maximum-exposure profile: almost every dollar of value is the exact kind of property the amendment exempts, and stripping the homesteads leaves little taxable base behind. At full $250,000 phase-in in 2028, the county’s exposure sits at 20.4%, with an 11.8% hit at the 2027 $150,000 step. The driver is straightforward: a high homestead share combined with a low commercial share means the exemption lands on nearly the whole base at once.

Of 79,037 residential housing units, 61.4% are owner-occupied, 13.7% are owned by out-of-state owners, and 24.9% are non-homestead but Florida-owned. The Florida-owned non-homestead share is notably larger than the out-of-state share, which reads as a local rental market rather than an absentee-ownership story. That local rental base is a structural asset worth protecting and expanding.

Land-use composition

Share of taxable value by category, Martin County, 2025 roll:

Residential dominates at nearly 3 in every 4 dollars of value. Commercial, industrial, and multifamily together account for just 10.1% of the base, which is the structural source of the county’s exposure. The Other/Vacant share at 6.3% and the Agricultural share at 5.3% represent land that has not yet been converted to its highest taxable use.

What the exposure band means

Moderate exposure. A meaningful but absorbable hit. The place has some non-homestead base to lean on. Mitigation is about steering future growth, not emergency response.

Looking ahead

Neither of the following changes the exposure figure above; both shape how the county grows its base after the amendment takes effect.

First, beginning January 1, 2027, the annual assessment-increase cap on non-homestead property drops from 10% to 5%, covering commercial, industrial, and small residential rentals of nine units or fewer. Because capped values can only rise 5% a year, the main engine of base growth in these categories becomes transactions: a sale or change of control resets a property to market value, so transaction velocity matters more to non-homestead base growth than it did under the old cap.

Second, new Florida residents who did not maintain a Florida permanent residence as of December 31, 2026 phase into the larger exemption over five years rather than receiving it all at once. This cannot be read from the roll, so the figures above assume full application of the exemption to every homestead. Near-term exposure could run slightly lower than modeled in areas where many recent arrivals are still inside their five-year window.

Where the opportunity is

These recommendations are based solely on the tax roll’s land-use composition. They do not account for whether local land development regulations and zoning permit the use, whether there is local obstruction, or the political dynamics that typically decide what actually gets approved. This is a starting point for a conversation, not a development plan.

• With commercial at only 5.5% of the base, building a commercial and employment spine is the single highest-leverage move available to Martin County. Converting a share of future growth from rooftops to taxable commercial square footage that carries no homestead exemption is the most direct path to a more resilient base. The target should be a neighborhood-serving retail node, a small office or medical-office cluster, or a light-flex business park positioned along an existing arterial where infrastructure already exists.
• Multifamily rental is the second major lever. Apartments pay full freight under the amendment. At only 2.3% of the base today, there is substantial room to allow well-sited rental development near jobs and transit, which adds non-homestead value and workforce housing simultaneously. The county’s 24.9% Florida-owned non-homestead residential share signals that local landlords are already active participants in the market, which is a foundation to build on.
• Any commercial and rental growth should be concentrated along an existing arterial or corridor rather than scattered across the county. Keeping new non-homestead square footage in one place allows a real non-homestead spine to form rather than staying thin everywhere. Directing both new commercial square footage and well-sited rental to that corridor is the organizing principle.
• The county should also prioritize commercial and industrial parcels for future growth rather than more subdivisions. Each new subdivision adds homestead value the amendment will exempt while adding service demand the millage must cover. The Other/Vacant share at 6.3% and the Agricultural share at 5.3% represent land that could be redirected toward non-homestead uses if the development code and market conditions align.
• Finally, any existing employment anchor already in place, whether a hospital, college, distribution facility, or government office complex, should be protected and intensified. These are the non-homestead taxpayers already contributing to the base, and their expansion is the fastest path to deepening it.

Watch-out: do not solve a revenue hole by approving more single-family subdivisions. Each one adds homestead value the amendment will exempt while adding service demand the millage must cover. That is the trap that created the exposure in the first place.

Source and scope

All figures are drawn from the Florida Department of Revenue 2025 final assessment roll, the most recent certified roll in the state’s possession. The roll is used here as a structural proxy for tax-base composition, not as a dollar forecast for any specific budget year. HJR 1 / CS-HJR 1F is on the November 2026 ballot; the 2026 roll is the assessment roll in place when voters decide. If the amendment passes, the first roll affected is the 2027 roll at the $150,000 step, followed by the 2028 roll at full $250,000 phase-in. Ownership shares are measured on a residential-units basis. The out-of-state ownership figure is a mailing-address proxy: it undercounts true outside ownership because an out-of-state owner using an in-state mailing address counts as Florida-owned, and it does not prove where any individual owner actually lives. This read is a land-use-composition starting point, not a full fiscal, economic, or legal analysis.

Place: Martin