Important Dates
Dates and deadlines for filing documents and applications with the Assessor's Office are listed below:
Please refer to the Community Outreach Events Program and Calendar for a list of times and places that applications will be accepted in addition to applying at the Assessor's Office.
January 1st – March 15th
- Accept applications for Homestead Exemption
- Accept applications for Additional Homestead Exemptions (Double Homestead)
- Accept applications for Senior Valuation Limitation
- Accept applications for Exempt Manufacturing
- Accept Personal Property Renditions for Business, Farm, and Manufactured Home (Mobile Home)
Homestead Exemption applications are accepted at any time throughout the year. However, the application must be filed by March 15 or within 30 days from the mailing date indicated on the "Notice of Increase in Valuation of Real Property" to be approved for the current year. Any application filed after these dates cannot be approved until the following year. Please refer to the Community Outreach Events Program and Calendar for a list of times and places applications will be accepted in addition to applying at the Assessor's Office.
February 1
All Real Property divisions and combinations of Real Property deeds with a notary date no later than December 31st must be filed with County Clerk, for the division or combination to be applied to the current year tax roll.
March 16
A 10% statutory penalty must be added to all Business, Farm, and Manufactured Home (Mobile Home) Personal Property Renditions not received or postmarked by March 15.
1st Monday in April
Last day to file an informal appeal if you were not mailed a “Notice of Increase in Valuation of Real Property”.
April 16
A 20% statutory penalty must be added to all Business, Farm, and Manufactured Home (Mobile Home) Personal Property Renditions not received or postmarked by April 15.
May 31
June 1
Application for Oklahoma Claim For Credit or Refund of Property Taxes (538-H Circuit Breaker) should be completed in order to assure it is received by the Oklahoma Tax Commission by June 30.
June 15
September 15 – October 1
Ownership and address changes for the current tax roll will be cut off immediately upon receipt of new millage rates. If you have moved or changed your mailing address, please notify our Title Research Department at (918)596-5129 or (918)596-5118, 8:00–5:00 Monday–Friday (excluding holidays) in order to receive proper notification of change of value notices and tax statements.