Oklahoma County Assessor
Important Dates for Assessment Purposes

January 1:

All taxable real and personal property appraised and assessed as of this date.

January 1st - March 15th

Listing of all taxable real and personal property in the county.
Accepts applications for additional homestead exemptions.
Accepts applications for senior valuation freeze.
Accepts applications for exempt manufacturing.

4th Monday in January:

Board of Equalization session commences for the purpose of correcting and adjusting the assessment roll to conform to fair cash value and such other responsibilities as prescribed by law.

March 15:

If any personal property is not listed on or before March 15th , but on or before April 15th, when such property is assessed there shall be added to the assessed valuation of such property a mandatory penalty of 10% of the assessed value.

  April 15:

If any personal property is not listed on or before April 15th, when such property is assessed there shall be added to the assessed valuation of such property a mandatory penalty of 20% of the assessed value.  

  May 1st:

A taxpayer may file a complaint if the valuation of property has not increased or decreased from the previous year if the complaint is filed on or before the first Monday in May.  Such complaint shall be made upon a form prescribed by the Oklahoma Tax Commission. 

  May 31:

Board of Equalization adjourns.

  June 15:

No later than June 15th or 1st working day thereafter,  County Assessor prepares an annual abstract (summary) of assessed valuations on all taxable property within the county and transmits said abstract to the Oklahoma Tax Commission. 

  July 31:

On or before July 31st, the State Auditor certifies public service valuations to all assessors.

  October 1:

Tax roll delivered to County Treasurer
Click here for more tax bill information including payment schedules with the County Treasurer's Office