Oklahoma Property Tax Calculator

How Oklahoma property tax is calculated

1. Value. The county assessor sets the home's fair cash value.
2. Assessed value. Multiply by the county's assessment percentage for real property: 11.00% in Oklahoma County and 11.00% in Tulsa County, 11.00% to 13.00% across all 77 counties (Oklahoma Tax Commission, 2024).
3. Exemptions. Subtract $1,000 for the homestead exemption, plus another $1,000 if you qualify for the additional homestead exemption.
4. Levy. Multiply the taxable value by the total millage for your location and divide by 1,000. A mill is $1 of tax per $1,000 of taxable value.

For example, a $300,000 home in Oklahoma City's district code 200 with the homestead exemption: $300,000 × 11% = $33,000; minus $1,000 = $32,000; × 122.90 mills ÷ 1,000 = $3,932.80 a year, or $327.73 a month.

Fair cash value vs. the price you pay

The Oklahoma County Assessor defines fair cash value as the price a knowledgeable, willing buyer and seller would agree on with neither under pressure, and market price as the amount actually paid in a particular sale. They're often close, but the assessor's number is the one that's taxed, so use it here if you have it.

Oklahoma's Constitution (Art. 10, § 8B) limits how fast fair cash value can rise: 3% a year for homestead and agricultural property and 5% for everything else. The limit doesn't apply in a year the title is transferred or improvements are made. So when you buy, the home can be revalued to fair cash value that year. In Oklahoma County, the assessor's deed codes show that a sale removes the previous owner's cap and exemptions, so file for your own homestead exemption. The cap limits the value, not the bill: a new bond levy can still raise your tax.

Oklahoma County millage by city and school district

Oklahoma County publishes a total levy for each district code. The 2025 rates were certified Nov 17, 2025 and range from 87.80 mills (Unincorporated · Oakdale #29) to 140.78 mills (Nichols Hills · Oklahoma City #89). On a $250,000 home with the homestead exemption, that's $2,327 to $3,731 a year. The district code is printed on your tax bill and on the assessor's property record.

Assessment percentages and average rates for all 77 counties

Outside Oklahoma County, the calculator uses each county's average effective millage from the Oklahoma Tax Commission's 2024 Ad Valorem Statistics, the latest edition published. It's an average across every taxing district in the county, so your district can be higher or lower. Your county treasurer's or assessor's site has the district rates.

Exemptions homeowners can claim

• Homestead exemption: $1,000 off the assessed value of the home you own and live in on January 1. Apply with your county assessor on OTC Form 921 by March 15 (or within 30 days of a notice of valuation increase); applications after that take effect the next year. Once granted, it continues while you live there.
• Additional homestead exemption: another $1,000 for heads of household whose gross household income from all sources for the previous year was $30,000 or less. Apply on OTC Form 994. (The Oklahoma County Assessor's page shows $30,000 in one section and $25,000 in its glossary; the Tax Commission's rule says $30,000.)
• Senior valuation freeze: owners 65 and older below an income limit set from HUD's county median can have their homestead's value frozen (Okla. Const. art. 10, § 8C; Form 994). The calculator doesn't model it.

The formula

Tax per year = (V × A − E) × M ÷ 1,000
Tax per month = Tax per year ÷ 12