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Updated 2025 Tax Year

Oklahoma County
Property Tax Guide

Everything you need to know about property taxes in Oklahoma County, OK. Rates, due dates, exemptions, and how it affects your monthly payment.

8 Official Sources
8 min read
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Quick Facts
Tax Rate
~1% effective rate (varies by taxing districts)
1st Due
Nov 1
2nd Due
Mar 31
Exemptions
5+ Available
Section 1

How Property Tax Works

Oklahoma County operates under Oklahoma's property tax system, where property taxes serve as a primary funding source for local government services, public schools, and special districts. The county assessor determines property values, while various taxing authorities set mill levies that combine to create your total tax rate. Property taxes in Oklahoma County fund essential services including public education, county operations, municipal services, and infrastructure maintenance.

Oklahoma County property owners typically face an effective tax rate around 1% of assessed value, though the actual rate varies based on your specific location and the taxing districts that serve your property. The county uses a mill-based system where each mill represents $1 of tax per $1,000 of net assessed value. Your total tax bill reflects the combined mills from all applicable taxing authorities, including the county, school districts, municipalities, and any special assessment districts.

Section 2

What Makes Up Your Tax Bill

ComponentRate (Mills)Description
County GeneralVariesBasic county operations and services
School DistrictVaries by DistrictLocal public school funding
MunicipalVaries by CityCity services (if within city limits)
State Tax4.5 MillsOklahoma state property tax
Special DistrictsVariesFire districts, library districts, other special services
Bond IssuesVariesVoter-approved debt service for infrastructure

Note: Total combined rate typically ranges from 80-120 mills (8%-12%) depending on location and applicable districts. Exact rates vary by property location and are updated annually.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Oklahoma County, property taxes are due in two installments:

First Installment
Nov 1
Delinquent after Dec 10
Second Installment
Mar 31
Delinquent after Apr 10
Pro tip: If you pay through mortgage escrow, your lender splits these payments across your monthly mortgage. If you pay directly, set calendar reminders to avoid late penalties.
Section 4

Supplemental Tax Bills

Supplemental taxes in Oklahoma County occur when property undergoes significant changes that affect its assessed value during the tax year. The most common triggers include new construction, major improvements, ownership changes that remove exemptions, or corrections to previous assessments. These taxes represent the difference between what was originally billed and what should have been billed based on the property's updated status.

Supplemental taxes are calculated by determining the new assessed value, applying the current tax rate, and prorating the additional tax owed based on the remaining months in the tax year. For example, if you complete a $50,000 home addition in July, and your tax rate is 100 mills, you would owe approximately $250 in supplemental taxes (($50,000 × 11.5% assessment ratio × 100 mills) ÷ 2 for half-year). The supplemental bill is typically issued separately from your regular annual tax bill.

Example Calculation

$300,000 Home:

  • Assessed Value: $300,000 × 11.5% = $34,500
  • Less Homestead Exemption: $34,500 - $1,000 = $33,500
  • Net Taxable Value: $33,500
  • Annual Tax (100 mills): $33,500 × 0.100 = $3,350
  • Monthly Payment: $3,350 ÷ 12 = $279

$600,000 Home:

  • Assessed Value: $600,000 × 11.5% = $69,000
  • Less Homestead Exemption: $69,000 - $1,000 = $68,000
  • Net Taxable Value: $68,000
  • Annual Tax (100 mills): $68,000 × 0.100 = $6,800
  • Monthly Payment: $6,800 ÷ 12 = $567

$1,000,000 Home:

  • Assessed Value: $1,000,000 × 11.5% = $115,000
  • Less Homestead Exemption: $115,000 - $1,000 = $114,000
  • Net Taxable Value: $114,000
  • Annual Tax (100 mills): $114,000 × 0.100 = $11,400
  • Monthly Payment: $11,400 ÷ 12 = $950

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Oklahoma County require borrowers to establish an escrow account for property tax payments, especially when the loan-to-value ratio exceeds 80%. Your lender collects monthly payments equal to your estimated annual property tax divided by 12, then pays the county treasurer directly when taxes become due. Oklahoma County property taxes are typically due by December 31st, though specific payment schedules may vary by taxing district.

Property owners should verify their escrow payments annually by comparing their tax bill to the amount their lender is collecting. If your property tax increases due to reassessment or rate changes, you may need to adjust your monthly escrow contribution to avoid a shortage. You can monitor your tax payments and verify amounts paid through the Oklahoma County Treasurer's office at https://www.oklahomacounty.org/treasurer/. Lenders typically conduct annual escrow analyses and will notify you of any required payment adjustments.

How HonestCasa Helps
  • Understand whether your escrow is set correctly
  • See how rising taxes will change your monthly payment
  • Plan ahead instead of being surprised by "shortage" letters
Section 6

Frequently Asked Questions

Q: When are property taxes due in Oklahoma County? A: Property taxes are generally due by December 31st each year, though payment schedules may vary by taxing district.

Q: What exemptions are available to homeowners? A: Oklahoma County offers a $1,000 homestead exemption for primary residences. Additional exemptions may be available for seniors, veterans, and disabled persons. Contact the assessor's office for specific eligibility requirements.

Q: How often are properties reassessed? A: Oklahoma County conducts annual assessments, with physical inspections typically occurring every 4-6 years unless significant improvements are made.

Q: How can I appeal my property assessment? A: Assessment appeals must be filed with the Oklahoma County Board of Equalization by the specified deadline, typically in March. Contact the assessor's office for forms and procedures.

Q: What happens if I pay my taxes late? A: Late payments incur penalties and interest charges. Properties with delinquent taxes may eventually face tax lien sales.

Q: Can I pay my property taxes online? A: Yes, Oklahoma County offers online payment options through the treasurer's website. Various payment methods including credit cards and bank transfers are typically accepted.

Q: How do I find information about my specific property? A: Use the property search tool at https://www.oklahomacounty.org/assessor/ to look up assessment details, tax history, and exemption information for any property in the county.

Q: What if I disagree with supplemental tax charges? A: Supplemental tax assessments can be appealed through the same process as regular assessments. Contact the assessor's office promptly to discuss your options and deadlines.

Verified Sources

Backed by 8 Official Government Sources

Every fact in this guide is sourced from official county, state, and federal documents.

01
County
Oklahoma County Assessoroklahomacounty.org
02
County
Oklahoma County Assessoroklahomacounty.org
03
2025 COPO 1st Quarter - Oklahoma.govoklahoma.gov
04
Tax Doc
House Studies Property Tax Reformokhouse.gov
05
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 ...oklegislature.gov
06
County
Oklahoma County Data & Informationdigitalprairie.ok.gov
07
2024 Supplement.xlsmokc.gov
08
2026 Form 901-P Business Personal Property Petroleum ...oklahoma.gov
All sources verified as of 2025 Tax Year

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