HonestCasa logoHonestCasa
Updated 2025 Tax Year

Gilliam County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
$3.845 per $1,000 assessed value (base rate, varies by district)
Exemptions
4+ Available
Section 1

How Property Tax Works

Gilliam County property taxes fund essential local services including schools, fire protection, public safety, roads, and county operations. The county operates under Oregon's property tax system, where taxes are calculated based on assessed value multiplied by the applicable tax rate. For the 2025-26 fiscal year, Gilliam County's base property tax rate is $3.845 per $1,000 of assessed value.

Property tax rates in Gilliam County vary by location within the county due to special taxing districts such as school districts, fire districts, and other local improvement districts. Property owners may be subject to additional assessments beyond the base county rate depending on which special districts serve their property. The county assessor determines assessed values annually, and property owners have appeal rights if they disagree with their assessment.

Section 2

What Makes Up Your Tax Bill

ComponentRate (per $1,000)Description
Base County Rate$3.845Gilliam County general operations (FY 2025-26)
School DistrictsVariesLocal school district levies
Fire DistrictsVariesFire protection services
Special AssessmentsVariesLocal improvement districts, bonds

Note: The $3.845 rate applies to the FY 2025-26 levy year and represents the base county rate only. Actual tax rates vary significantly by location within Gilliam County depending on which special taxing districts serve each property. Contact the Gilliam County Assessor's office for your specific total tax rate.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Gilliam 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 are additional property tax bills issued when there are changes in property ownership or improvements after the regular assessment date. Common triggers include property sales (change of ownership), new construction, or completion of major improvements that increase assessed value.

Supplemental taxes are calculated by applying the current tax rate to the difference between the old and new assessed values, prorated for the portion of the tax year remaining. For example, if a property's assessed value increases by $50,000 due to new construction completed in January, and the total tax rate is $10 per $1,000, the supplemental tax would be $500 prorated for the remaining months in the tax year.

Example Calculation

Example 1: $300,000 Home

  • Assessed Value: $300,000
  • Less: Homestead Credit (if applied for): varies
  • Net Taxable Value: $300,000 (assuming no credits)
  • Tax Rate: $3.845 per $1,000 (base rate only)
  • Annual Tax: $1,154
  • Monthly Escrow: $96

Example 2: $600,000 Home

  • Assessed Value: $600,000
  • Less: Available Tax Credits (requires application): varies
  • Net Taxable Value: $600,000 (assuming no credits)
  • Tax Rate: $3.845 per $1,000 (base rate only)
  • Annual Tax: $2,307
  • Monthly Escrow: $192

Example 3: $1,000,000 Home

  • Assessed Value: $1,000,000
  • Less: Applied Tax Credits (must file application): varies
  • Net Taxable Value: $1,000,000 (assuming no credits)
  • Tax Rate: $3.845 per $1,000 (base rate only)
  • Annual Tax: $3,845
  • Monthly Escrow: $320

Note: These examples use only the base county rate. Actual taxes will be higher due to additional special district assessments. Most tax credits require annual application and are not automatic.

See How Taxes Affect Your Payment

Property taxes are just part of your total monthly cost. Get the full picture.

Calculate Now
Section 5

Escrow & Property Taxes

Most mortgage lenders require property tax escrow accounts for Gilliam County properties. Lenders collect monthly payments equal to 1/12th of the annual property tax bill plus a cushion amount. Property taxes in Gilliam County are typically due April 1st, and lenders must pay the full annual amount by this deadline to avoid penalties.

Homeowners should verify their escrow payments annually when they receive their property tax statement. If your assessed value or tax rate changes significantly, contact your lender to adjust monthly escrow payments. Lenders are required to provide an annual escrow analysis showing deposits, payments, and any surplus or shortage. When you pay off your mortgage, you become responsible for making direct tax payments to Gilliam County.

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 Gilliam County property taxes due for FY 2025-26? A: Property taxes are due April 1st. Late payments are subject to penalties and interest charges.

Q: What tax credits are available and how do I apply? A: Tax credits may include homestead credits, senior deferral, and disability credits. All tax credits require application - they are not automatic. Contact the Gilliam County Assessor's office for specific application forms and deadlines.

Q: What is the homestead credit and how does it work? A: The homestead credit limits assessment increases on your primary residence, typically capping annual growth at 3%. This reduces your taxable assessed value, not market value. You must file an application to receive this credit.

Q: What is the deadline for tax credit applications? A: Most tax credit applications are due by April 15th. The homestead rebate application deadline is July 1st. Senior tax deferral applications are due by April 15th.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed with the Gilliam County Board of Property Tax Appeals. The board typically convenes in the spring to hear appeals.

Q: What happens if I pay my taxes late? A: Late payments incur penalties and interest charges that accrue until the full amount is paid. Contact the county tax collector for specific penalty rates.

Q: Can I pay my property taxes online? A: Contact the Gilliam County tax collector's office to inquire about online payment options and accepted payment methods.

Q: How do special district taxes work? A: Special districts (fire, school, etc.) levy additional taxes beyond the base county rate. Your total tax rate depends on which districts serve your property location.

Q: When must special assessments be filed? A: The deadline for filing special assessments is March 15th.

Q: How are property values assessed? A: Property assessments are based on real market value as of January 1st of each tax year. The county assessor reviews and updates assessments annually.

See the Full Picture of Your Home Costs

Property taxes are just one piece of homeownership. HonestCasa helps you understand your total monthly cost and explore safe ways to access your home equity.

Total Monthly Cost

Mortgage + taxes + insurance + HOA

Equity Growth

Track how your equity grows over time

Safe Equity Access

Options for projects or debt payoff

Free • No credit check • 2-minute estimate