Rate Breakdown

Property taxes in Monroe County are calculated by multiplying the assessed value (minus exemptions) by the total local millage rate.

How Property Tax Works in Monroe County

Monroe County, like the rest of Florida, bases property taxes on the assessed value of the real‑estate parcel. Each year the County Property Appraiser (CPA) determines the market value of a property by reviewing recent sales, construction costs, and any improvements. Once the market value is established, the CPA applies the statutory homestead exemption (if qualified) and any other applicable exemptions, resulting in the taxable value.

The taxable value is then multiplied by the county’s total millage rate (expressed in mills, where one mill equals $1 per $1,000 of taxable value). Monroe County’s millage includes contributions to the County School Board, the City of Key West (or other municipalities), the Monroe County Tax Collector, the fire district, and special districts such as the Monroe County Tourist Development Tax. For 2024, the combined rate is roughly 16.5 mills, though exact rates may vary by property type and location.

Formula:
Property Tax = Taxable Value × (Total Millage Rate ÷ 1,000)

Available Exemptions

Florida offers several exemptions that directly reduce the taxable value of a property. In Monroe County, the most common are:

• Homestead Exemption – Up to $50,000 for primary residences. The first $25,000 applies to all taxes; the second $25,000 (excluding school taxes) applies only to assessed values above $50,000.
• Senior Citizen Exemption – $5,000 for owners 65 or older who meet income limits.
• Disability Exemption – $5,000 for residents with a qualifying disability, plus an additional $5,000 for those 65+ with a disability.
• Veteran & Service‑Member Exemptions – Up to $5,000 for honorably discharged veterans and service members, with additional benefits for surviving spouses of veterans who died in combat.

All exemptions are applied before the millage rate is calculated, so they lower the overall tax bill. Applications must be filed with the Monroe County Property Appraiser by March 1 of the tax year.

Payment Schedule & Deadlines

Monroe County property taxes are due in two installments:

• First Installment – November 1, with a discount if paid before November 30.
• Second Installment – March 1, with a discount if paid before March 31.

If a payment is missed, a 10% penalty is added to the overdue amount, plus a $10 interest charge per $100 of tax owed. Continued delinquency can result in a tax lien, a tax certificate sale, and eventually a tax deed foreclosure. Property owners may opt for monthly installments through the Tax Collector’s “Pay‑As‑You‑Go” program, which spreads the tax burden and eliminates penalties.

Appealing Your Assessment

If you believe your property’s market value is inaccurate, you have the right to contest it.

1. File a Petition – Submit a written petition to the Monroe County Value Adjustment Board (VAB) by the deadline listed on your notice of proposed taxes (usually within 30 days of receipt).
2. Gather Evidence – Provide comparable sales, recent appraisals, photographs, or repair estimates that support a lower value.
3. VAB Hearing – Attend the hearing; the board will consider your evidence and may request additional information.
4. Decision & Further Review – The VAB issues a written decision. If you disagree, you may appeal to the Florida State Board of Administration within 30 days of the VAB decision.

Timely filing and a well‑documented case are essential for a successful appeal. The Monroe County Property Appraiser’s website provides sample forms and detailed guidance to help you through each step.