States We Serve › Oklahoma
Oklahoma Property Tax
Oklahoma moves fast. The protest window opens the day a valuation notice is mailed and closes thirty calendar days later, the County Board of Equalization sits through the spring, and the court appeal that follows is measured in days. Knowing the dates is most of the battle.
At a glance
- Date of value
- January 1 of the tax year.
- Assessment ratio
- Each county sets its own ratio between 11% and 13.5% of fair cash value (Adair County, for example, uses 12%). Ratios are fixed at their 1996 levels and cannot be changed without a vote. Okla. Const. Art. X §8
- Valuation increase cap
- Taxable fair cash value may rise no more than 5% a year for commercial and other non-homestead real property (3% for homestead and agricultural land). The cap lifts on a sale, new addition or substantial improvement. Art. X §8B
- Personal property rendition
- File with the county assessor between January 1 and March 15. Penalty of 10% after March 15 and 20% after April 15. 68 O.S. §2836
- Valuation notices
- Mailed when the assessor increases value; most counties send them February through April.
- Informal protest
- Within 30 calendar days of the mailing date on the notice. If value did not increase and no notice was sent, request a hearing by the first Monday in April. 68 O.S. §2876
- County Board of Equalization
- Appeal the assessor’s informal decision within 10 working days. Boards meet April 1 through May 31 (longer in the largest counties).
- Appeal from the board
- Property with a fair cash value of $3,000,000 or less: district court, within 10 days of the board’s order, tried de novo. Property over $3,000,000: the Court of Tax Review, within 30 calendar days of the mailing or delivery of the board’s order. Taxes must be paid, under protest, while either appeal is pending. 68 O.S. §2880.1, §3024, §2884
- Tax bills and due dates
- Bills go out in November. Pay in full by December 31, or half by December 31 and the balance before April 1. Penalty and interest run from April 1 at 1.5% a month.
- Sale price disclosure
- Full-disclosure state — documentary stamps on the deed show the price, and assessors use them.
- Intangibles
- Intangible personal property is not taxed.
The Oklahoma calendar
A typical year. Individual counties vary on when notices go out; the protest window is counted from the mailing date printed on your notice.
- Jan 1Date of value. Rendition filing period opens.
- Feb–AprValuation increase notices mailed.
- Mar 15Business personal property rendition deadline (10% penalty after; 20% after April 15).
- +30 daysInformal protest due 30 calendar days after the notice mailing date.
- 1st Mon. AprDeadline to request a hearing if you received no notice.
- Apr 1–May 31County Board of Equalization in session; appeal to the board within 10 working days of the assessor’s informal decision.
- +10 / +30 daysAppeal of the board’s order: district court within 10 days (value ≤ $3M) or Court of Tax Review within 30 calendar days (value > $3M).
- NovTax bills mailed.
- Dec 31Taxes due in full, or first half.
- Apr 1Second half due; penalties begin.
How an appeal moves
Three steps, each with a short clock, and the third step depends on the size of the property. Missing the first one ends the year’s appeal, so we calendar the notice date the day it arrives.
Informal protest
File with the assessor within 30 days of the notice mailing date. The assessor must rule within five working days of the informal hearing.
County Board of Equalization
Appeal within 10 working days of the assessor’s decision. The board hears evidence from both sides and issues a written order.
District court or Court of Tax Review
Value of $3 million or less: district court, within 10 days of the board’s order, heard fresh. Value over $3 million: the Court of Tax Review, within 30 calendar days — a three-judge panel of district judges appointed by the Supreme Court, which must rule within 12 months. Most cases settle before trial.
Pay under protest
If the case is in court when taxes come due, pay in full and file the payment-under-protest form with the treasurer so the disputed amount is held apart.
Laws worth knowing
Article X §8B — the 5% cap
Added by voters in 1996 and tightened in 2012. The assessor may not raise a parcel’s taxable fair cash value more than 5% a year (3% homestead/agricultural) regardless of market movement, except for a sale, new construction or a substantial improvement. After a sale the value resets to market.
Fair cash value and the income approach
68 O.S. §2817 defines fair cash value as the price a willing buyer would pay a willing seller, and directs the assessor to consider the cost, income and sales approaches. For income property, actual income and expenses and market cap rates are admissible and often decisive.
Payment under protest
68 O.S. §2884. When an appeal is pending in court, pay the full tax and file the protest form; the treasurer holds the disputed portion in escrow until the case is decided. Without the form the payment is treated as voluntary.
Court of Tax Review
68 O.S. §3024. A specialized court for larger and statewide tax disputes. For locally assessed property it hears appeals from county board orders where fair cash value exceeds $3,000,000, filed within 30 calendar days of the order. The Chief Justice assigns the case to a judicial district, whose presiding judge names a three-judge panel; a majority decides, within 12 months of assignment. The Clerk of the Supreme Court in Oklahoma City is the court’s clerk. It also hears public service corporation valuations, State Board of Equalization actions and illegal-levy protests.
Re-plats and splits
When a parcel is re-platted the county may require payment of the prior year’s full taxes plus a 20% deposit before the new plat is accepted; the excess is refunded once the new parcels are assessed.
Renditions and penalties
68 O.S. §2836–2837. Business personal property must be listed with the assessor each year; the penalty for a late rendition is 10% of the assessed value after March 15 and 20% after April 15, and an unrendered account may be estimated and assessed by the assessor.
Sales chasing
Oklahoma assessors routinely re-value a parcel to its recent sale price. A purchase above the prior assessment should be expected to show up in the next notice — and the 5% cap no longer protects it.
Official resources
Oklahoma Tax Commission — Ad Valorem Division · Title 68, Oklahoma Statutes (Article 28, Ad Valorem Tax Code) · County Assessors Association of Oklahoma · Rules of the Court of Tax Review
This page is general information about Oklahoma property tax procedure, not legal advice. Deadlines and ratios change; confirm the current year’s dates with the county or with us before relying on them.
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