Washington County Property Tax Appeal, Oregon

Travis Bunn·Updated July 24, 2026

Washington County is Oregon's second-most populous county with approximately 611,700 residents as of 2025, and serves as a key economic hub in the Portland metropolitan area. The county seat is Hillsboro, and major population centers include Beaverton, Tigard, Tualatin, and Forest Grove. Property tax appeals matter significantly here because Washington County residents pay some of the highest property taxes in Oregon, with a median annual bill of $5,122 compared to the statewide median of $3,895. The county's median home value of $610,700 is the highest in Oregon, and its effective tax rate of 0.84% exceeds both the state average (0.78%) and approaches the national average (0.89%). With approximately 207,000 property tax statements mailed annually and property values consistently rising, homeowners who successfully appeal can save hundreds or even thousands of dollars each year.

Notable cities: Hillsboro, Beaverton, Tigard, Tualatin, Forest Grove, Sherwood, Cornelius

Median Home

$610,700

Tax Rate

0.84%

Annual Tax

$5,122

Population

611,700

On the typical Washington County home, valued near $610,700 at the county’s effective tax rate of 0.84%, an over-assessment of even 10% means you are overpaying year after year until you appeal it. Here is how to find out if yours qualifies.

2026 Appeal Deadline: December 31, 2026

That is at most 128 days away. Your exact date is on your assessment notice, so do not wait on it.

See if your Washington County home is over-assessed

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Oregon home against evergreen hills. Washington County appeal guide.

How Washington County Assesses Property

100%of market value

Assessed by: Washington County Department of Assessment and Taxation

Assessment cycle: annual

Notices typically mailed: October 17-21

Oregon assesses property at 100% of its Real Market Value (RMV), which is the price your property would sell for on the open market as of January 1st each year. However, your actual Assessed Value (AV) used to calculate taxes is the lower of the RMV or the Maximum Assessed Value (MAV), which can only increase by 3% annually under Oregon's Measure 50. For example: if your home's market value is $610,700 (the county median), and your MAV has kept pace, your assessed value would be $610,700, resulting in approximately $5,130 in annual taxes at Washington County's effective rate of 0.84%. If your MAV is lower due to the 3% cap, you pay taxes on that lower amount instead.

The Appeal Process

Appeals are heard by the Board of Property Tax Appeals (BOPTA). PVAB hearings are informal and do not require an attorney. The board is comprised of independent citizens appointed by the Board of Commissioners who must make decisions based on evidence presented and their knowledge of the market.

Step 1: Review your property tax statement received in late October for the Real Market Value (RMV), Maximum Assessed Value (MAV), and Assessed Value (AV) listed for your property.

Step 2: Gather evidence supporting a lower property value, including comparable sales of similar properties that sold for less than your assessed value, recent appraisals, photos documenting property condition issues, or records showing assessment errors (wrong square footage, incorrect features).

Step 3: Complete the Property Value Appeals Board (PVAB) petition form (Form 150-310-063), available by downloading from the county website, calling (503) 846-3854, or picking up in person at 155 N First Avenue, Suite 130, Hillsboro.

Step 4: Submit your completed petition form with all supporting documentation by mail, in person, or electronically before the December 31, 2026 deadline, no filing fee is required.

Step 5: Attend your informal PVAB hearing, typically scheduled between February and April 15, where you'll present your evidence to independent citizen board members; alternatively, you may elect to have the board decide based on your written petition alone without attending.

Step 6: If you disagree with the PVAB decision, you may appeal to the Oregon Tax Court Magistrate Division (with a $50 filing fee) within the allowed timeframe, and further to the Tax Court Regular Division if needed.

Step 7: As a final option, decisions from the Tax Court Regular Division may be appealed directly to the Oregon Supreme Court.

Required form: Property Value Appeals Board (PVAB) Petition (Form 150-310-063 or Washington County PVAB petition form)

Filing Methods

online:Contact (503) 846-3854 for electronic filing options and forms

mail:Washington County Property Value Appeals Board, 155 N. First Ave., Suite 130-MS9, Hillsboro, OR 97124

in-person:Department of Assessment & Taxation, 155 N First Avenue, Suite 130, MS 9, Hillsboro, OR 97124 (Monday-Friday, 8:30 AM - 5:00 PM)

phone:Call (503) 846-3854 for forms and filing assistance

Evidence to Bring

Comparable sales of similar propertiesRecent independent appraisalPhotos of property condition or defectsRepair estimates or contractor bidsDocumentation of assessment errors (incorrect square footage, features, or lot size)

Washington County Assessor Contact

Washington County Department of Assessment and Taxation

Phone: 503-846-8741

Address: 155 N First Avenue, Suite 130, Hillsboro, OR 97124

Website: https://www.washingtoncountyor.gov/at

Online Portal: https://washcotax.co.washington.or.us/

Hours: Monday-Friday, 8:30 AM - 5:00 PM

Tax Exemptions in Washington County

Disabled Veteran Exemption

$27,092 for basic exemption; $32,512 for service-connected disability (2026 amounts, increase 3% annually)

Reduces assessed value for veterans with at least 40% service-connected disability or their surviving unremarried spouse

Eligibility: Must be a veteran certified by the U.S. Department of Veterans Affairs or Armed Forces as 40% or more disabled, or surviving spouse/registered domestic partner who has not remarried; must own and occupy the property as primary residenceDeadline: April 15

Senior and Disabled Property Tax Deferral

Full deferral of property taxes; state pays county on homeowner's behalf with approximately 6% annual interest

Allows qualifying homeowners age 62+ or receiving federal Social Security disability to defer property tax payments until the property is sold

Eligibility: Must be age 62+ or receiving federal Social Security disability; household income must be below approximately $54,500-$57,500; must have sufficient equity to secure state's interest in the propertyDeadline: April 15

Measure 50 Assessment Growth Cap

Maximum Assessed Value (MAV) can only increase by 3% per year, regardless of market value increases

Constitutional limit on assessed value increases, providing automatic tax relief for longtime homeowners

Eligibility: Automatic for all property owners; no application requiredDeadline: Automatic - no application needed

Washington County Appeal Packet · $49

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Frequently Asked Questions

What is the deadline to appeal my property taxes in Washington County for 2026?

The deadline to file a property tax appeal with the Washington County Property Value Appeals Board (PVAB) is December 31, 2026. If December 31 falls on a weekend or holiday, the deadline automatically extends to the next business day. The filing period opens when property tax statements are mailed out in late October. You must submit your completed PVAB petition form and supporting documentation by this deadline, and there is no fee to file. Missing this deadline means you'll have to wait until the next tax year to appeal your property value.

How do I file a property tax appeal online in Washington County?

To file a property tax appeal in Washington County, you must complete a Property Value Appeals Board (PVAB) petition form, which can be downloaded from the county website at washingtoncountyor.gov or obtained by calling (503) 846-3854. While the county does accept electronic submissions, you should contact the PVAB office at (503) 846-3854 to confirm current online filing procedures. You can also file by mail to Washington County Property Value Appeals Board, 155 N. First Ave., Suite 130-MS9, Hillsboro, OR 97124, or in person at the Department of Assessment & Taxation during business hours (Monday-Friday, 8:30 AM - 5:00 PM). All filings must be received by December 31, 2026.

What evidence do I need to win a property tax appeal in Washington County?

The strongest evidence for a Washington County property tax appeal includes comparable sales data showing similar properties in your area that sold for less than your assessed value within the past year. You should gather at least 3-5 comparable sales with similar characteristics (square footage, bedrooms, bathrooms, lot size, age, and condition). Additional supporting evidence includes a recent independent appraisal from a licensed Oregon appraiser, photographs documenting property condition issues or defects, repair estimates from licensed contractors, and documentation of any assessment errors such as incorrect square footage, wrong number of rooms, or features you don't have. The Property Value Appeals Board makes decisions based on evidence and market knowledge, so clear, objective documentation is critical to success.

How much can I save by appealing my property taxes in Washington County?

The savings from a successful property tax appeal in Washington County depend on how much your assessed value is reduced. At Washington County's effective tax rate of 0.84%, every $10,000 reduction in assessed value saves you approximately $84 per year in property taxes. For example, if you successfully reduce your assessed value from $610,700 (the county median) to $575,000, a reduction of $35,700, you would save approximately $300 annually. Given that approximately 25% of homes nationwide are overassessed by an average of $1,346 per year according to industry data, Washington County homeowners who appeal and win can realize significant savings that compound year after year, especially given Oregon's 3% annual assessment growth cap under Measure 50.

What happens at a Property Value Appeals Board hearing in Washington County?

Washington County PVAB hearings are informal proceedings held between February and April 15 where you present your case to a panel of independent citizens appointed by the Board of Commissioners. You do not need an attorney to represent yourself. The clerk will notify you of the time and place to appear, and you'll have the opportunity to present your evidence showing why your property's assessed value should be lower, including comparable sales, appraisals, photos, and other documentation. The board members will review your evidence and may ask questions about your property. Alternatively, you can choose not to attend and let the board render a decision based solely on the written petition and evidence you submitted. The board has authority to hear appeals of property value only, not the amount of tax you pay or tax rates.

Can I appeal both my Real Market Value and Maximum Assessed Value in Washington County?

Yes, you can appeal your Real Market Value (RMV) with the Washington County Property Value Appeals Board. Under Oregon's Measure 50 system, your property has both an RMV (the estimated market price as of January 1) and a Maximum Assessed Value (MAV) that can only increase 3% per year. Your actual Assessed Value (AV) used for taxes is the lower of the two. When you appeal to PVAB, you're challenging the county assessor's determination of your property's Real Market Value. If you successfully reduce your RMV below your MAV, your taxes will be calculated on the lower RMV. The MAV itself is calculated based on statutory formulas and is not directly appealable, but reducing your RMV can provide immediate tax savings if your RMV is currently lower than your MAV.

What is the disabled veteran property tax exemption worth in Washington County?

For tax year 2026, Washington County's disabled veteran exemption is worth $27,092 in reduced assessed value for veterans with at least 40% disability rating, or $32,512 for service-connected disabilities. The exemption amounts increase by 3% each year. At Washington County's effective tax rate of 0.84%, the basic exemption saves approximately $228 per year, while the service-connected disability exemption saves approximately $273 annually. To qualify, you must be a veteran certified by the U.S. Department of Veterans Affairs or Armed Forces as being 40% or more disabled, or be the surviving unremarried spouse or registered domestic partner of a qualified veteran. You must own and occupy the property as your primary residence. Applications must be filed with the county assessor by April 15.

If I disagree with the PVAB decision, what are my appeal options in Washington County?

If you are not satisfied with the Property Value Appeals Board's decision in Washington County, you have several levels of appeal available. First, you may appeal to the Magistrate Division of the Oregon Tax Court, which requires a $50 filing fee and must be filed within 30 days of the PVAB decision. The Magistrate Division will conduct a new review of your case. If you disagree with the Magistrate Division's decision, you can further appeal to the Regular Division of the Oregon Tax Court, which provides a more formal hearing process. Finally, decisions from the Regular Division can be appealed to the Oregon Supreme Court as a last resort. Each level requires filing within specific deadlines and following proper procedures, so it's important to note the decision dates and act quickly if you wish to continue your appeal.

Official Resources

Washington County Assessment & Taxation Official Website →

Official county website with property tax information, assessment details, exemption applications, and appeal forms.

Washington County Property Value Appeals Information →

Detailed information about the PVAB appeal process, petition forms, hearing schedules, and filing instructions.

Washington County Property Search and Tax Lookup →

Online portal to search property records, view assessments, check tax statements, and access valuation history.

Oregon Department of Revenue Property Tax Resources →

Statewide property tax information, exemption forms, deferral program applications, and Oregon tax laws.

For state-wide appeal information including Oregon's assessment ratio and deadlines, see our Oregon Property Tax Appeal Guide →

Considering professional help with your appeal? Compare pricing, coverage, and pros/cons in our Best Property Tax Appeal Services (2026) or browse side-by-side service comparisons →

More Oregon Counties

Clackamas County (Oregon City)Multnomah County (Portland)

← All Oregon property tax appeal info

Sources: https://www.washingtoncountyor.gov/at/appraisal/bpp/property-value-appeals-formally-board-property-tax-appeals-bopta | https://smartasset.com/taxes/washington-county-oregon-property-tax-calculator | https://www.washingtoncountyor.gov/at | https://propertytaxrates.org/exemptions/oregon/ | https://www.appealdesk.com/appeals/oregon/washington

Last verified: 2026-07-24