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Updated 2025 Tax Year

Washington County
Property Tax Guide

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

7 Official Sources
8 min read
Quick Facts
Tax Rate
Varies by location due to multiple taxing districts - county, city, school, fire, library districts combined
1st Due
Oct 17
2nd Due
Nov 15
Exemptions
5+ Available
Section 1

How Property Tax Works

Washington County operates under Oregon's property tax system, which funds essential local services including schools, fire protection, libraries, parks, and county operations. Property taxes are calculated based on assessed value and vary significantly by location within the county due to different combinations of special taxing districts. Each property may be subject to taxes from multiple jurisdictions including the county, cities, school districts, fire districts, library districts, and other special service districts.

The county assesses approximately 207,000 properties annually, generating about $1.742 billion in property tax revenue. Property tax statements are mailed between October 17-21 each year, with payments typically due by November 15. Effective tax rates generally range from 1.0% to 1.5% of assessed value, though rates can vary considerably based on your specific location and the special districts that serve your property. All tax credits and most exemptions require separate applications and are not automatically applied to your property tax bill.

Section 2

What Makes Up Your Tax Bill

ComponentApproximate RateDescription
County General Fund$0.85-1.20 per $1,000Basic county services, roads, public safety
School District$4.50-6.50 per $1,000Local school operations and bonds
Education Service District$0.30-0.50 per $1,000Regional education support services
Community College$0.60-0.80 per $1,000Portland Community College district
Cities$2.00-4.50 per $1,000Municipal services (varies by city)
Fire District$0.80-1.50 per $1,000Fire protection and emergency services
Library District$0.40-0.70 per $1,000Public library services
Parks & Recreation$0.30-0.80 per $1,000Parks and recreational facilities
Special AssessmentsVariesLocal improvement districts, bonds

Rates shown are for FY 2024-2025 and vary significantly by specific taxing district combinations. Your actual tax rate depends on which districts serve your property location. Total combined rates typically range from $10-16 per $1,000 of assessed value.

Section 3

When Are Property Taxes Due?

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

First Installment
Oct 17
Delinquent after Dec 10
Second Installment
Nov 15
Delinquent after Apr 10
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 significant changes occur to a property during the tax year. The most common triggers include change of ownership, completion of new construction, or major improvements that increase the property's assessed value. These taxes cover the difference between the original assessment and the new assessed value for the remaining portion of the tax year.

Supplemental taxes are calculated by determining the increase in assessed value, applying the same tax rate as your regular property tax bill, then prorating the amount based on the number of months remaining in the fiscal year. For example, if you purchase a home in January that was previously assessed at $400,000 but now has a market value of $500,000, you would receive a supplemental tax bill for the $100,000 increase in assessed value, prorated for the remaining months until the next regular assessment cycle. Supplemental tax bills are typically mailed within 60-90 days of the triggering event and have separate due dates from regular property taxes.

Example Calculation

Example 1: $300,000 Home

  • Assessed Value: $300,000
  • Homestead Credit Applied: -$3,000 (requires application)
  • Net Taxable Value: $297,000
  • Combined Tax Rate: $12.50 per $1,000
  • Annual Tax: $3,712.50
  • Monthly Escrow: $309.38

Example 2: $600,000 Home

  • Assessed Value: $600,000
  • Homestead Credit Applied: -$3,000 (requires application)
  • Net Taxable Value: $597,000
  • Combined Tax Rate: $13.75 per $1,000
  • Annual Tax: $8,208.75
  • Monthly Escrow: $684.06

Example 3: $1,000,000 Home

  • Assessed Value: $1,000,000
  • Homestead Credit Applied: -$3,000 (requires application)
  • Net Taxable Value: $997,000
  • Combined Tax Rate: $14.25 per $1,000
  • Annual Tax: $14,207.25
  • Monthly Escrow: $1,183.94

Note: Tax rates vary by specific location and special district combinations. Credits shown require separate applications and are not automatically applied. Actual rates for your property may differ significantly.

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Section 5

Escrow & Property Taxes

Most homeowners with mortgages have their property taxes collected through an escrow account managed by their lender. Your mortgage servicer estimates your annual property tax amount and collects 1/12 of that estimate with each monthly mortgage payment. The lender then pays your property taxes directly to Washington County when they become due in November.

It's important to verify that your lender has paid your taxes correctly and on time. You can check payment status and view your tax account online at https://www.washingtoncountyor.gov/at/property-tax-payments. If your assessment changes significantly or if tax rates increase, your lender may require an escrow analysis and adjust your monthly payment accordingly. Property owners remain ultimately responsible for ensuring taxes are paid even when using escrow, so monitor your account regularly and contact your lender immediately if you notice any discrepancies or late payments.

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 property taxes due in Washington County? A: Property tax statements for FY 2024-2025 are mailed between October 17-21, with payment due by November 15. Payments must be postmarked by November 15 to avoid penalties.

Q: What tax credits are available and how do I apply? A: Common credits include the Homestead Credit (limits assessment growth to 3% annually), Senior/Disabled Citizen Credit, Veterans Disability Credit, and Low-Income Rental Housing Credit. All credits require separate applications filed with the County Assessor's office by specific deadlines.

Q: How does the Homestead Credit work? A: The Homestead Credit caps annual assessment increases at 3% for owner-occupied primary residences. It does not reduce market value but limits how much your assessed value can increase each year. You must file an application to receive this benefit.

Q: When do I need to file for tax credits? A: Most credit applications must be filed by April 1st for the following tax year. New property owners have until December 31st of their first year of ownership to apply for applicable credits.

Q: How is my property assessed? A: Washington County assesses all properties annually as of January 1st. Assessments are based on market value as of the previous tax year, using comparable sales, income approaches, and cost methods.

Q: What happens if I pay my taxes late? A: Interest begins accruing on unpaid taxes after November 15th at a rate set annually by the state. Additional penalties may apply for taxes that remain unpaid beyond May 15th of the following year.

Q: Can I pay my property taxes online? A: Yes, you can pay online, view your tax statement, and check payment history at https://www.washingtoncountyor.gov/at/property-tax-payments. The county accepts credit cards, debit cards, and electronic checks.

Q: How do special district taxes affect my bill? A: Your property may be subject to taxes from multiple special districts including fire, library, parks, water, and sanitary districts. Each district sets its own tax rate, which is why rates vary significantly by location within the county.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed with the Washington County Board of Property Tax Appeals by December 31st. Contact the Assessor's office at https://www.washingtoncountyor.gov/at/ for appeal forms and procedures.

Q: Do I need to reapply for tax credits each year? A: Most credits, once approved, continue automatically as long as you remain eligible. However, you must notify the Assessor's office if your circumstances change, and some credits may require periodic re-certification.

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