Pay Monroe County property taxes and find the right Keys office
The Monroe County Tax Collector handles property-tax collection, tax bill payments, delinquent collections and several state-agent services across the Florida Keys. The office does not decide your assessed value or homestead exemption—that belongs to the Monroe County Property Appraiser.
Use this guide to verify the tax account, understand the November-to-March payment cycle, choose a Key West, Big Pine Key, Marathon, Plantation Key or Key Largo office, and avoid sending money through the wrong website.
What does the Monroe County Tax Collector actually handle?
In Monroe County, Florida, the Tax Collector collects real-estate and tangible personal property taxes after the Property Appraiser completes the assessment roll. The office also handles many vehicle, vessel, driver-license, business-tax and other state-agent transactions, although services vary by branch.
Paying or searching a property-tax bill, confirming a posted payment, getting a prior tax bill, asking about a missing bill, installment or partial-payment options, delinquent tax redemption and tax certificates.
Assessed value, exemptions, homestead filings, parcel characteristics, ownership data, property search, TRIM notices and questions about how the taxable value was established.
The annual TRIM notice explains proposed values, exemptions and taxing-authority rates. It is not the same thing as the Tax Collector’s annual payment bill.
How to search and pay Monroe County property taxes online
The official Tax Collector website sends property-tax users to the Monroe County GovHub/County-Taxes portal. Use that linked system for live account information rather than relying on an amount copied into a directory, search result or old tax notice.
Open the Monroe County Tax Collector’s property-tax page or payment page first. That official page links to the authorized Monroe County tax account system.
Use the search fields presented by the live portal. Have the property address, owner information, parcel/account information or tax notice available so you can distinguish similar results.
Before opening checkout, verify that the record is for Monroe County, Florida and that the parcel, situs address, owner/account information and tax year match the bill you intended to pay.
An old printed notice may not show current interest, advertising costs or tax-certificate amounts. The live account should control when a balance has become delinquent.
The Tax Collector currently lists e-check with no additional service charge, a $2.85 PIN-debit service charge and a 2.85% credit-card service charge. Recheck the checkout screen before authorizing payment.
Keep the confirmation, tax account information, tax year and bank/card record. If the payment does not appear as expected, use that information when contacting the Property Tax Department.
Monroe County property-tax dates, discounts and where September 2026 fits
Monroe County’s regular annual real-estate tax cycle begins when tax notices are mailed on or before November 1. The gross annual amount is due by March 31, and unpaid real-estate taxes become delinquent April 1.
As of September 15, 2026, the normal 2026 annual bill cycle has not yet reached its November payment period. If you are enrolled in the quarterly installment program, however, the second installment is due September 30. If you are trying to pay an unpaid 2025 annual bill now, treat it as a delinquent account and use the live balance.
| Timing | Regular real-estate tax rule | What to do |
|---|---|---|
| On or before Nov. 1 | Annual tax statements are normally mailed. | Search online if the bill has not arrived by the second week of November. |
| November | 4% discount period. | Pay early only after verifying the correct tax year and parcel. |
| December | 3% discount period. | Check the live amount because the discount changes with the month. |
| January | 2% discount period. | Do not rely on a November amount saved earlier. |
| February | 1% discount period. | Confirm any mortgage/escrow payment before paying a duplicate bill. |
| March 31 | Gross annual amount due. | Resolve a missing or rejected payment before delinquency begins. |
| April 1 | Unpaid real-estate taxes become delinquent. | Use the live delinquent balance and Tax Collector instructions. |
Online, check, wire and other payment details
The official payment page currently lists e-check with no additional service charge. Use the routing information from an actual check/account and verify the account entry carefully before submitting.
The current official page lists a $2.85 service charge for PIN debit and 2.85% for credit cards. These processor costs can change, so the live checkout screen controls.
Checks on U.S. banks are directed to Sam Steele, Tax Collector, P.O. Box 1129, Key West, FL 33041-1129. Include enough bill/account information for proper posting.
The official payment page tells taxpayers to call 305-295-5090 for wire-transfer instructions rather than publishing bank details openly.
Quarterly installments, partial payments and homestead tax deferral
These programs solve different problems. Do not treat “installment,” “partial payment” and “deferral” as interchangeable terms.
For eligible real-estate and tangible personal property accounts with estimated tax over $100. The application window runs between November 1 and April 30 for the applicable tax roll year.
Allows current-year real-estate or tangible tax to be paid in pieces. Each partial payment must be at least $100, early-payment discounts are forfeited and the current-year balance must be cleared by March 31 to avoid delinquency.
A separate program for qualifying homestead-exempt taxpayers whose taxes are high relative to household income. A deferral creates a lien and deferred taxes accrue interest.
Quarterly installment schedule
| Installment | Due date | Calculation / discount | Practical note |
|---|---|---|---|
| First | June 30 | One-quarter of prior year’s gross tax, discounted 6% | If paid in July instead, the first-payment discount is lost. Failure to make it by July 31 ends that year’s installment participation. |
| Second | September 30 | One-quarter of prior year’s gross tax, discounted 4.5% | This is the next installment date for enrolled taxpayers as of September 15, 2026. |
| Third | December 31 | One-quarter of adjusted current-year tax, discounted 3% | A missed prior installment can be rolled into a later payment, with the relevant discount lost. |
| Fourth | March 31 | One-quarter of adjusted current-year tax, no discount | Any unpaid balance remaining April 1 becomes subject to delinquent-tax rules. |
What happens after Monroe County property taxes become delinquent?
For real estate, unpaid taxes become delinquent April 1. The official Important Dates page states that a 3% interest charge is added to the gross real-estate tax amount at that point. Advertising costs and tax-certificate procedures can follow if the balance remains unpaid.
Do not calculate a payoff from the original November bill. Open the live account or contact the office for the amount currently required.
The office states that delinquent real-estate accounts are advertised and that related advertising costs are added.
Florida uses tax certificates for delinquent real estate. A certificate is a lien against the real estate; it is not a direct purchase of the property.
When a tax certificate exists, the property owner or other authorized payer redeems it by paying the required taxes, interest and applicable costs through the official process.
The official Tax Collector explains that after the statutory waiting period a certificate holder may apply for a tax deed, and the Clerk of the Circuit Court conducts the tax-deed sale process.
Monroe County Tax Collector office locations for property-tax service
The official Office Locations page lists property-tax service at the Key West Main Office, Big Pine Key Satellite Office, Marathon Branch, Plantation Key Branch and Key Largo Branch. Branch service menus differ, especially for driver-license tests, passports and specialty transactions.
MAIN
Key West Main Office
Address: 1200 Truman Ave., Ste. 101, Key West, FL 33040
Hours: Monday-Friday, 8:00 a.m.-4:45 p.m. Driver-license services end earlier.
Phone: 305-295-5000
Property-tax service: Yes. Also handles a broad range of vehicle, business tax and other listed services.
KEY
Big Pine Key Satellite Office
Address: 247 Key Deer Blvd., Big Pine Key, FL 33043
Detailed locations-page hours: Tuesday-Thursday, 8:30 a.m.-4:15 p.m.
Phone: 305-872-4751
Property-tax service: Yes.
Important: The official homepage summary has displayed different Big Pine hours from the detailed locations page. Check the live Office Locations page immediately before driving there.
Marathon Branch Office
Address: 3015 Overseas Hwy., Marathon, FL 33050
Hours: Monday-Friday, 8:00 a.m.-4:45 p.m.
Phone: 305-289-6034
Property-tax service: Yes. Driver-license testing and other service-specific cutoffs can be earlier than closing time.
KEY
Plantation Key Branch Office
Address: 88800 Overseas Hwy., Plantation Key, FL 33070
Hours: Monday-Friday, 8:00 a.m.-4:45 p.m.
Phone: 305-852-7150
Property-tax service: Yes. The published service list is narrower than some full-service branches, so verify the branch before combining a tax trip with another transaction.
LARGO
Key Largo Branch Office
Address: 101487 Overseas Hwy., Key Largo, FL 33037
Hours: Monday-Friday, 8:00 a.m.-4:45 p.m.
Phone: 305-853-3562
Property-tax service: Yes. The office also lists driver-license and several other services.
Tax Collector vs Property Appraiser vs Clerk: where should your records question go?
In Florida, “property records” can mean at least three different things. Sending the question to the right office is usually faster than calling the closest government counter.
| Your question | Start with | Reason |
|---|---|---|
| How much tax is due? | Tax Collector | The Tax Collector maintains the payment account and collects the billed amount. |
| Did my tax payment post? | Tax Collector | Payment history and current bill status belong to the collection side. |
| Why is my assessed value this high? | Property Appraiser | The Property Appraiser establishes assessed value and maintains the assessment roll. |
| Where is my homestead exemption? | Property Appraiser | Homestead and other property-tax exemptions are assessment functions. |
| I need a parcel/property search | Property Appraiser | Property characteristics, assessment, exemptions and parcel information are maintained there. |
| I need a deed or recorded instrument | Clerk / official records route | Recorded instruments are not Tax Collector payment records. |
| A tax certificate exists | Tax Collector | Certificate redemption and tax-deed application amounts begin with the Tax Collector. |
Other services provided by the Monroe County Tax Collector
The Florida Tax Collector is more than a property-tax cashier. Monroe County’s office acts as an agent for state and local agencies and publishes branch-specific service menus.
Titles, registrations, license plates, vessel services and related motorist transactions. Not every test or specialty service is offered at every branch.
Several offices handle driver-license services, with earlier service cutoffs and branch restrictions for testing.
The Tax Collector handles Local Business Tax services. Check the appropriate branch and current application requirements.
This is especially relevant in the Florida Keys rental market. Use the dedicated Tax Collector department rather than the property-tax account portal.
Several offices list hunting and fishing license service as part of the Tax Collector’s state-agent role.
Depending on location, services may include concealed-weapon permit applications, passports, birth certificates and hurricane re-entry stickers.
Common Monroe County tax problems and the fastest next step
Search the official tax account. If you still cannot locate the expected bill by the second week in November, contact the Property Tax Department at 305-295-5044.
Do not assume the informational notice means the escrow payment posted. Check the live tax account before making a second payment.
Paying the bill and challenging the assessment are separate workflows. Contact the Property Appraiser for value, exemption or parcel-record issues.
Discounts change monthly before delinquency, and interest/costs can change after April 1. Use the live amount rather than recalculating from an old paper bill.
Keep your own record of every partial payment and remaining balance. Partial payments lose the early-payment discount and must be completed by March 31 to avoid delinquency.
This article covers Monroe County, Florida—the Florida Keys. Do not use these portals for Monroe County in New York, Pennsylvania, Michigan, Mississippi or another state.
Open the official Monroe County source that matches the task
Use the following only after identifying which office or service you need. Fees, branch hours, appointment availability, delinquent balances and forms can change.
Monroe County Tax Collector FAQs
What is the official Monroe County Tax Collector website?
The official Monroe County, Florida Tax Collector website is MonroeTaxCollector.com. Property-tax payments should begin there or through the GovHub/County-Taxes portal linked from that site.
How do I pay Monroe County Florida property taxes online?
Open the official Tax Collector payment page, follow its property-tax payment link to the authorized Monroe County GovHub portal, locate the correct account, verify the parcel and tax year, review the current fee and save the payment confirmation.
When are Monroe County Florida property taxes due?
Annual tax notices are normally mailed on or before November 1. Early-payment discounts are 4% in November, 3% in December, 2% in January and 1% in February. The gross amount is due by March 31 and unpaid real-estate taxes become delinquent April 1.
What are the online property-tax payment fees?
The official payment page currently lists e-check at no additional charge, a $2.85 service charge for PIN debit and a 2.85% service charge for credit cards. Verify the live checkout amount because processor fees can change.
Where is the main Monroe County Tax Collector office?
The Key West Main Office is at 1200 Truman Ave., Suite 101, Key West, FL 33040. The office-location page lists Monday-Friday hours of 8:00 a.m.-4:45 p.m., with earlier cutoffs for some driver-license services.
Can I pay Monroe County property taxes in installments?
Eligible taxpayers may use the quarterly installment plan. The official schedule lists payments on June 30, September 30, December 31 and March 31. Eligibility, application deadlines and continuing participation rules should be checked on the official Alternative Payment Options page.
Can I make partial property-tax payments?
Florida’s statutory partial-payment option is available for current-year real-estate and tangible personal property taxes under the official program. Monroe County states that each partial payment must be at least $100, early-payment discounts are forfeited and the balance must be paid by March 31 to avoid delinquency.
What happens if Monroe County property taxes are not paid by March 31?
Unpaid real-estate taxes become delinquent April 1. The official Important Dates page states that a 3% interest charge is added to the gross real-estate amount, and advertising and tax-certificate procedures may follow if the balance remains unpaid.
Does buying a Monroe County tax certificate mean you own the property?
No. The Tax Collector explains that a tax certificate is a first lien against real estate, not a sale of the property. A later tax-deed process is separate and subject to Florida law.
Who handles property value and homestead exemption questions?
The Monroe County Property Appraiser handles assessed values, property records, exemptions, homestead filings and TRIM information. The Tax Collector collects the tax bill after the assessment roll is certified.
The TaxCollectors.org Editorial Team researches and reviews U.S. tax collector offices, property tax procedures, payment resources, deadlines, and official government links. TaxCollectors.org is an independent information publication operated by Quarks Systems Global Solutions.