Florida Homestead Tax Calculator

Where property data comes from

Address and parcel lookup uses the Okaloosa County Property Appraiser's public ArcGIS REST service:

gis.myokaloosa.com/arcgis/rest/services/BaseMap_Layers/MapServer/111

Optional enrichment may also read the Property Appraiser's per-parcel detail page and AssessmentInformation layer for district names and overlay detection. We are not affiliated with the Property Appraiser or Tax Collector.

Where millage rates come from

Ad valorem millage lines come from the Okaloosa County Tax Collector's certified 2025 millage chart, maintained in this project's data files and validated against real TRIM notices. Line-item rates match TRIM Column 3 (proposed 2025 rates), not prior-year Column 1 figures.

Non-ad valorem assessments (flat fees, MSBUs, stormwater, etc.) are not included because they are set per parcel and are not available through the public feeds we use.

How calculations work

The calculator applies Florida homestead exemption rules to each millage line: $25,000 on school lines (unchanged in every scenario) and a scenario-specific amount on non-school lines. It models three SJR 2-F scenarios — current law plus Phase 1 and Phase 2.

Monitoring & accuracy

A nightly automated check verifies that the county ArcGIS lookup endpoint still responds. That catches outages and breaking schema changes, not subtle data errors. See our project's docs/monitoring.md for upstream health check details.

Countywide fiscal impact (computed)

We compute projected ad valorem revenue reductions for Okaloosa County taxing districts by applying SJR 2-F exemption phases to currently homesteaded parcels in the public Property Appraiser roll, using 2025 certified millage rates. Regenerate with npm run compute:fiscal-impact.

• Phase 1 ($150,000 exemption): approximately 30.6 million in reduced ad valorem revenue (34.3% reduction on current homestead ad valorem)
• Phase 2 ($250,000 exemption): approximately 49.7 million (55.6% reduction)

These figures use SJR 2-F's exact exemption levels. They will be cross-checked against the County's own fiscal impact analysis when an SJR 2-F-specific version is published. See docs/fiscal-impact-validation.md for methodology notes.

Corrections

Found a mismatch with your TRIM notice? Email info@saveourhomescalc.com with your parcel number and we'll investigate.