In unincorporated Seminole County, the Seminole County property tax rate for the 2025–2026 fiscal year is roughly 13.68 mills, which works out to about $13.68 for every $1,000 of taxable value. That number is not set by one office. It stacks together levies from the county, the school board, a water management district, and local service units. If you live inside a city like Sanford, Lake Mary, or Altamonte Springs, your municipality adds its own millage on top.
How the Millage Breaks Down
A mill equals one dollar of tax per $1,000 of assessed taxable value.1Florida Department of Revenue. A Florida Homeowner’s Guide: Millage For property in unincorporated Seminole County, the proposed FY 2025–2026 rates are:2Seminole County Property Appraiser. Proposed 2025 Millage Rates
- County Operating: 5.3751 mills
- Fire/Rescue MSTU: 2.7649 mills
- Road MSTU: 0.1107 mills
- School Board, required local effort: 3.0010 mills
- School Board, discretionary operating: 2.2480 mills
- St. Johns River Water Management District: 0.1793 mills
Properties inside a city skip the unincorporated Municipal Service Taxing Unit charges for fire and roads but pick up the city’s own millage, which usually pushes the combined rate higher. These rates are reset every year through the Truth in Millage process under Florida Statutes Section 200.065, so expect movement up or down each cycle depending on budgets and countywide values.3Florida Senate. Florida Statutes 200.065 – Method of Fixing Millage
How to Calculate What You’ll Owe
Florida assesses all real property as of January 1 each year.4The Florida Legislature. Florida Code 192.042 – Date of Assessment The Property Appraiser sets your parcel’s just (market) value on that date, subtracts any exemptions, and arrives at taxable value. Your ad valorem tax equals taxable value multiplied by the total millage, divided by 1,000.
A worked example: a home with a just value of $350,000 and a $50,000 homestead exemption has a taxable value of $300,000. At a combined 13.68 mills, the ad valorem portion of the bill comes to roughly $4,104 before any early-payment discount. You can pull your own parcel’s assessed value, exemptions, and taxing-authority breakdown from the Seminole County Property Appraiser’s website.5Seminole County Property Appraiser. Seminole County Property Appraiser Home Page
One timing wrinkle matters for new builds. If a home or addition is not substantially completed by January 1, it carries no assessed value for that tax year. Once it reaches a usable state by the following January 1, the improvement is added to the roll.4The Florida Legislature. Florida Code 192.042 – Date of Assessment
Exemptions That Lower the Rate You Actually Pay
Homestead Exemption
If you own and permanently reside in a home as of January 1, you qualify for up to $50,000 off assessed value, split into two pieces that behave differently.6The Florida Legislature. Florida Code 196.031 – Exemption of Homesteads The first $25,000 is exempt from all property taxes, including school district levies. The second $25,000 applies only to assessed value between $50,001 and $75,000, and only reduces non-school taxes. The slice of value between $25,001 and $50,000 is fully taxable. So a home assessed at $100,000 or more gets the full $50,000 reduction on county, fire, and water management levies but only $25,000 off the school portion.7Florida Department of Revenue. Property Tax Information for Homestead Exemption
You can file online or in person at the Property Appraiser’s office. The regular window runs January 1 through March 1, with a filing deadline of March 2, 2026 for the 2026 tax year. Missing it means waiting; you can pre-file for the following year starting March 2.5Seminole County Property Appraiser. Seminole County Property Appraiser Home Page
Save Our Homes Cap
Once homestead is in place, Florida Statutes Section 193.155 caps annual increases in your assessed value at 3 percent or the change in the Consumer Price Index, whichever is lower.8Florida Senate. Florida Statutes 193.155 – Homestead Assessments The cap kicks in the year after you first receive the exemption, and over time it creates a widening gap between market value and taxed value. In a county where home values have climbed steeply, long-term owners can save thousands a year. The protection resets if you sell, move, or lose the exemption.
Portability
If you move within Florida, you can transfer the difference between your old home’s market value and its capped assessed value to a new homestead, up to $500,000.8Florida Senate. Florida Statutes 193.155 – Homestead Assessments You have three assessment years from giving up the old exemption to establish a new homestead and claim the transfer. Buying up carries the full dollar amount of the difference. Downsizing proportionally reduces the transferred amount based on the ratio of new value to old.9The Florida Legislature. Florida Code 193.155 – Homestead Assessments The portability application is filed alongside the homestead application by March 1.
Senior Low-Income Exemption
Homeowners aged 65 or older whose total household adjusted gross income does not exceed $38,686 (the 2026 threshold, adjusted annually) may qualify for an additional exemption of up to $50,000. Applicants file a sworn income statement with the Property Appraiser by March 1.10FindLaw. Florida Statutes 196.075 – Additional Homestead Exemption for Persons 65 and Older If household income later rises above the limit, you must notify the Property Appraiser by May 1.
Disabled Veteran Exemption
Veterans with a service-connected total and permanent disability certified by the U.S. Department of Veterans Affairs owe no ad valorem taxes on their homestead, with no cap on home value and no income test.11The Florida Legislature. Florida Code 196.081 – Exemption for Totally and Permanently Disabled Veterans An un-remarried surviving spouse keeps the exemption. A partial disability rating of at least 10 percent qualifies for a smaller $5,000 reduction.
Non-Ad Valorem Assessments on the Same Bill
Your tax bill carries more than millage-based taxes. Non-ad valorem assessments are flat charges for specific services and do not change with your home’s value. In Seminole County, these commonly cover solid waste collection, street lighting, and water or drainage services, and some neighborhoods carry fire or stormwater assessments through Municipal Service Benefit Units.12Seminole County Tax Collector. Property and Tangible Taxes Two homes of different market values on the same street pay the same garbage pickup assessment. Because these fees are collected on the tax bill, missing payment carries the same consequences as missing ad valorem taxes.
The TRIM Notice and Challenging Your Assessment
Every August, you receive a Truth in Millage (TRIM) notice showing your proposed assessed value, applied exemptions, and the millage each authority plans to levy.3Florida Senate. Florida Statutes 200.065 – Method of Fixing Millage This is your window to catch valuation errors or a missing exemption before the final bill locks in.
If you believe your assessed value is too high, you have 25 days from the mailing date of the TRIM notice to file a petition with the Value Adjustment Board. The filing fee is $15. At the hearing you can present evidence such as recent comparable sales, an independent appraisal, or documentation of property defects. The burden starts with the Property Appraiser to show the assessment is correct.
If a lender escrows your taxes, forwarding the TRIM notice helps them adjust the escrow estimate, since it is more current than earlier projections.
Payment Discounts and Deadlines
Tax bills are mailed in November and the full amount is due by the end of March. Florida rewards early payment on a sliding scale:13Florida Senate. Florida Code 197.162 – Tax Discount Payment Periods
- November: 4 percent discount
- December: 3 percent discount
- January: 2 percent discount
- February: 1 percent discount
- March: face amount, no discount
On a $4,000 bill, paying in November saves $160. The Seminole County Tax Collector accepts online payments, mailed checks, and in-person visits.12Seminole County Tax Collector. Property and Tangible Taxes
If a lump sum is difficult, you can apply by April 30 for a quarterly installment plan when your estimated tax exceeds $100. The four installments carry their own smaller discounts, and once enrolled you stay on the plan each year unless you miss a payment.14The Florida Legislature. Florida Code 197.222 – Installment Method for Payment of Estimated Taxes
What Happens If You Don’t Pay
Unpaid property taxes become delinquent on April 1 with no grace period. A mandatory 3 percent interest charge applies immediately, and interest continues to accrue at 18 percent per year from the date of delinquency.15The Florida Legislature. Florida Code 197.172 – Interest Rate; Calculation and Minimum By June 1, the Tax Collector must hold a tax certificate sale, auctioning certificates on delinquent parcels. A certificate buyer pays your overdue taxes and earns interest when you repay. If you don’t redeem within two years, the holder can apply for a tax deed, which starts a foreclosure process that can end with you losing the property. Enrolling in the quarterly installment plan before April 30 or calling the Tax Collector about options is far cheaper than letting delinquency run.