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Updated 2025 Tax Year

Grant County
Property Tax Guide

Everything you need to know about property taxes in Grant County, OK. Rates, due dates, exemptions, and how it affects your monthly payment.

10 Official Sources
8 min read
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Quick Facts
Tax Rate
1% base rate plus varying district levies (total rate varies by location within county)
Exemptions
4+ Available
Section 1

How Property Tax Works

Grant County, Oklahoma operates under a property tax system that funds essential local services including schools, roads, emergency services, and county operations. Property taxes are assessed annually based on fair market value as of January 1st each year, with Oklahoma's statewide base assessment rate around 1% of market value. The county assessor determines property values, while the county board of equalization sets the final tax rates each year.

Property tax rates in Grant County vary significantly by location within the county due to overlapping special taxing districts including school districts, fire districts, and other municipal services. The total effective tax rate combines the county's base levy with additional assessments from these various districts, resulting in different tax bills even for properties of similar value. Homeowners should verify their specific tax rate based on their exact location and applicable taxing districts.

Property taxes in Grant County are collected annually with the first installment due by April 30th each year. The tax system provides several credits and exemptions that require application - these benefits are not automatically applied and property owners must file the appropriate paperwork by specified deadlines to receive them.

Section 2

What Makes Up Your Tax Bill

Based on available data for Grant County Levy Year 2024 (Tax Year 2025):

ComponentRate (per $1,000)Description
State School Part 1$1.86Mandatory state school funding levy
County GeneralVariesCounty operations and services
Local School DistrictsVariesAdditional school district levies
Special DistrictsVariesFire districts, library districts, etc.
Municipal TaxesVariesCity taxes where applicable

Note: These rates apply to Levy Year 2024 for Tax Year 2025. The State School Part 1 rate of approximately $1.86 per $1,000 of assessed value is the only complete rate available from current data. Total effective rates typically range from $8-15 per $1,000 of assessed value depending on your specific location and applicable special taxing districts within Grant County. Contact the Grant County Assessor's office for your exact rate based on your property's location.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Grant County, property taxes are due in two installments:

Pro tip: If you pay through mortgage escrow, your lender splits these payments across your monthly mortgage. If you pay directly, set calendar reminders to avoid late penalties.
Section 4

Supplemental Tax Bills

Supplemental taxes in Grant County are triggered by specific events that change a property's assessed value or ownership status during the tax year. The primary triggers include new construction completion, property ownership transfers, and significant improvements that increase the property's value after the January 1st assessment date.

When supplemental taxes are levied, they are calculated based on the difference between the original assessed value and the new assessed value, prorated for the remaining portion of the tax year. For example, if a home addition is completed in July, supplemental taxes would be calculated on the increased value for the remaining 6 months of the tax year.

Supplemental tax bills are issued separately from regular annual property tax bills and have their own due dates. Property owners receive notice of supplemental assessments and have the right to appeal these assessments through the same process used for regular property tax appeals.

Example Calculation

Example 1: $300,000 Home

  • Market Value: $300,000
  • Assessed Value (≈11.5%): $34,500
  • Homestead Credit Applied: -$1,000 (if qualified and applied)
  • Net Taxable Value: $33,500
  • Estimated Tax Rate: $12.50 per $1,000
  • Annual Tax: $419
  • Monthly Escrow: $35

Example 2: $600,000 Home

  • Market Value: $600,000
  • Assessed Value (≈11.5%): $69,000
  • Homestead Credit Applied: -$1,000 (if qualified and applied)
  • Net Taxable Value: $68,000
  • Estimated Tax Rate: $12.50 per $1,000
  • Annual Tax: $850
  • Monthly Escrow: $71

Example 3: $1,000,000 Home

  • Market Value: $1,000,000
  • Assessed Value (≈11.5%): $115,000
  • Homestead Credit Applied: -$1,000 (if qualified and applied)
  • Net Taxable Value: $114,000
  • Estimated Tax Rate: $12.50 per $1,000
  • Annual Tax: $1,425
  • Monthly Escrow: $119

Note: Tax credits shown require application and approval. Rates are estimates as actual rates vary by specific location within Grant County.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Grant County require property tax escrow accounts, where monthly tax payments are collected along with mortgage payments and held until tax bills are due. Lenders typically collect 1/12 of the annual property tax amount each month, plus a small cushion to account for potential tax increases.

Property tax bills in Grant County are due April 30th annually. Escrow servicing companies usually pay these bills in late April to ensure on-time payment. Homeowners should receive an annual escrow analysis statement showing how their payments are calculated and any adjustments needed for the following year.

If you don't have an escrow account, you're responsible for paying property taxes directly to Grant County by the April 30th deadline. Late payments incur penalties and interest charges. Homeowners can verify their tax payments and escrow account accuracy by checking with the Grant County Treasurer's office or accessing online payment records.

How HonestCasa Helps
  • Understand whether your escrow is set correctly
  • See how rising taxes will change your monthly payment
  • Plan ahead instead of being surprised by "shortage" letters
Section 6

Frequently Asked Questions

Q: When are Grant County property taxes due for Tax Year 2025? A: The first installment is due by April 30, 2025. If the due date falls on a weekend or holiday, the payment deadline may be extended to the next business day.

Q: What homestead tax credits are available and how do I apply? A: Grant County offers a homestead exemption that must be applied for with the county assessor. This credit caps annual assessment increases rather than reducing market value. Applications can be filed starting in January, with a deadline of March 15 for the current tax year. Late applications apply to the following tax year.

Q: How does the homestead credit work? A: The homestead credit limits how much your property's assessed value can increase each year, not your property's market value. You must file an application with the Grant County Assessor and requalify if your exemption is cancelled. This requires an active application - it's not automatic.

Q: Can I pay my property taxes online? A: Contact the Grant County Treasurer's office to verify current online payment options and accepted payment methods for property taxes.

Q: What happens if I pay my property taxes late? A: Late payments incur penalties and interest charges. The exact penalty structure should be confirmed with the Grant County Treasurer's office.

Q: How do I appeal my property assessment? A: Property assessment appeals must be filed with the Grant County Board of Equalization. There are specific deadlines and procedures that must be followed for appeals to be considered.

Q: Why do property tax rates vary within Grant County? A: Tax rates vary based on special taxing districts including school districts, fire districts, library districts, and municipal boundaries. Your exact location determines which districts apply to your property.

Q: When are properties assessed each year? A: Property values are assessed annually as of January 1st. The assessment reflects the property's condition and market value as of that date.

Q: Are there other tax credits available besides homestead? A: Additional exemptions may be available for seniors, disabled persons, or veterans. Contact the Grant County Assessor's office for a complete list of available programs and application requirements.

Q: What triggers a supplemental tax bill? A: Supplemental taxes are triggered by ownership changes, new construction completion, or significant improvements made after the January 1st assessment date.

Verified Sources

Backed by 10 Official Government Sources

Every fact in this guide is sourced from official county, state, and federal documents.

01
County
GRANT COUNTY LEVY YEAR 2024 for TAX YEAR 2025grantcountywa.gov
02
Tax Doc
2025 REPORTS AND OPINIONS OF THE PROPERTY TAX ...revenue.nebraska.gov
03
County
Property Tax - Grant Countyin.gov
04
County
Grant County Property Taxesnacdashboard.nara.gov
05
County
GRANT COUNTY - Oklahoma State Auditor & Inspectorsai.ok.gov
06
Tax Doc
TAX YEAR CALENDARgrantcountynm.gov
07
2026-2027 Form 921 Application for Homestead Exemptionoklahoma.gov
08
Oklahoma Homeowners Can Now Access Grants up to ...oid.ok.gov
09
Oklahoma Insurance Department Releases Grant Details for ...oid.ok.gov
10
County
GRANT COUNTY - Oklahoma Digital Prairiedigitalprairie.ok.gov
All sources verified as of 2025 Tax Year

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