How the proposed homestead exemption (“Save Our Homes from Excessive Property Taxes”) would affect Key Biscayne's local tax base — parcel by parcel.
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Type your street address to see how the proposed homestead exemption would change your estimated property tax.
Data sources & modeling assumptions (read me)
Parcel universe: all ZIP 33149 folios from Miami-Dade County's live ArcGIS “Property @ PaGis” layer. (The UM GDSC mirror in the brief is dead — its query backend 400s on every request — so we use the county's own equivalent layer.)
Values & exemptions: per-folio from the Miami-Dade Property Appraiser public roll API (certified 2025 roll). The GIS layers carry no exemption flag or taxable value — this API is the source for both.
Taxable base used: the non-school local taxable value (county/municipal taxable, after current exemptions). This is the base the Village of Key Biscayne + Miami-Dade county millage levy on. School taxable differs slightly (the extra $25K homestead exemption doesn't apply to schools) and is excluded from this model's base.
The bill: exempts the first $250K (then $500K, then all) of a homestead's value from taxation. Modeled as: reduce each homestead's taxable value by the exemption (floor $0); non-homestead residential & commercial are unchanged in every scenario.
Millage default 15.6226 mills = combined Village + County + School + special districts (2025). Village-of-KB-only operating millage is 2.9794. Both editable below.
Validation: summed Key-Biscayne-municipality taxable ≈ , vs the published $11.6B record base — a close match.
$100K$250K$500KFull elimination
Combined 15.6226Village only 2.9794
Scenario comparison — local revenue retained vs lost, at current millage & geography
Revenue retainedRevenue lost
Homestead vs non-homestead — share of taxable base