Your Oklahoma county is
collecting more than it should.
Oklahoma limits annual taxable value increases to 5% — but assessors set base values too high. The County Board of Equalization deadline falls in late April. Miss it and you wait another year.
Average Oklahoma homeowner overpayment: $724/year — that's $60/month.
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Oklahoma BOE Deadline — Last Monday of April
Oklahoma homeowners can protest valuations between January 1 and April 1 with the county assessor. Appeals to the County Board of Equalization must be filed by the last Monday of April. Check your county for exact dates. Miss this window and you cannot appeal until next year.
All 77 Oklahoma Counties
Select your county to see your local tax rate, average overpayment, and filing options.
Why Oklahoma Homeowners Are Getting Overcharged
Oklahoma assesses residential property at 11% of fair cash value per Oklahoma Constitution Art. 10, § 8. But county assessors frequently overstate fair cash value — especially in fast-growing markets like Oklahoma City, Tulsa, and Edmond.
Oklahoma's constitution caps annual taxable value increases at 5% per year regardless of market movement. But if your assessor sets the base fair cash value too high in the first place, the 5% cap does nothing to correct the error. The only fix is a formal protest.
The appeal process begins with an informal protest to the county assessor (January–April), then escalates to the County Board of Equalization (BOE). Adverse BOE decisions can be appealed to District Court. Most disputes are resolved at the assessor or BOE level. Fairmark handles all of it for $79 flat.
Only a small fraction of eligible Oklahoma homeowners protest their valuations each year. The barrier isn't the process — it's awareness. Most homeowners don't know they're overassessed until they look.
Important: Assessment cannot go up from an appeal
Filing a BOE protest in Oklahoma cannot raise your assessment. The County Board of Equalization can only reduce or leave unchanged your current fair cash value — never increase it. There is zero risk to checking and filing.
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How Oklahoma Property Tax Appeals Work
- 1
Receive your assessment notice (January–April)
Oklahoma county assessors mail valuation notices in the first quarter of each year. The notice shows your property's fair cash value and estimated tax obligation. This is your annual signal to check whether your assessment is accurate.
- 2
File an informal protest with the county assessor
Between January 1 and April 1, you can file an informal protest with your county assessor. Fairmark reviews your assessment, gathers comparable sales evidence, and handles the protest on your behalf.
- 3
Escalate to the County Board of Equalization
If the informal protest is unsuccessful, you have until the last Monday of April to file with the County Board of Equalization (BOE). Form OTC-901 is the standard petition. Fairmark prepares and submits all documentation.
- 4
Receive your corrected assessment
If the appeal succeeds, your fair cash value is reduced for the current tax year. With Oklahoma's 5% annual cap applying to the lower base, the savings compound over time.
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