Island County Property Tax Appeal, Washington

Travis Bunn·Updated July 22, 2026

Island County is located in northwestern Washington and comprises Whidbey Island, Camano Island, and several smaller islands in Puget Sound. The county seat is Coupeville, with major population centers in Oak Harbor and Langley. With a median home value of approximately $593,300 and an effective property tax rate of 0.67% to 0.73%, Island County has a relatively lower tax rate compared to Washington's state median of 0.92% but higher home values than many counties. The median annual property tax bill is approximately $3,999, which is notably higher than the national median of $2,400. Property tax appeals are particularly important in Island County because approximately 25% of homes nationwide are overassessed, and with higher home values, even small assessment errors can result in homeowners overpaying by hundreds or thousands of dollars annually.

Notable cities: Oak Harbor, Coupeville, Langley

Median Home

$593,300

Tax Rate

0.70%

Annual Tax

$3,999

On the typical Island County home, valued near $593,300 at the county’s effective tax rate of 0.70%, 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: July 1, 2026, or within 30 days of the date the Island County Change of Value Notice was mailed, whichever is later

The appeal deadline is the later of July 1st of the current assessment year or within 30 calendar days of when the Island County Change of Value Notice was mailed by the Assessor's Office. If mailing your petition, it must be postmarked by midnight of the deadline. The assessment year is the year before the tax is due and is shown on the Value Change Notice.

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How Island County Assesses Property

100%of market value

Assessed by: Island County Assessor's Office

Assessment cycle: annual

Notices typically mailed: Spring to mid-June

Washington State law requires the Island County Assessor to value property at 100% of its true and fair market value. This means your assessed value equals your market value with no reduction. For example, if your home's market value is $593,300 (the county median), at Washington's 100% assessment ratio your assessed value would be $593,300, resulting in approximately $4,153 in annual taxes at the county's effective rate of 0.70%.

The Appeal Process

Appeals are heard by the County Board of Equalization. The Island County Board of Equalization consists of five members and two alternates who serve three-year terms with the goal of providing an impartial hearing and fair decision. Hearings are formal proceedings where you present evidence supporting your claim that the assessed value is incorrect, and the Assessor's Office may present their evidence supporting their valuation.

Contact the Island County Assessor's Office at (360) 679-7303 for an informal review of your property valuation before filing a formal appeal. Many property owners can resolve disagreements at this level, though you should still file your petition with the Board of Equalization to preserve your appeal rights.

Obtain a Petition for Appeal form by calling the Island County Board of Equalization at (360) 679-7379 or visiting their office in person. The appeal form must include specific reasons why you believe the assessor's valuation is incorrect, such as an appraisal, excessive deterioration, or sales of comparable properties showing lower values.

Gather strong evidence to support your appeal, including comparable sales of 3-5 similar properties that sold for less than your assessed value, photos documenting property condition issues, repair estimates for any defects, and documentation of any assessment errors (wrong square footage, incorrect features, or lot size discrepancies).

File your completed petition with the Island County Board of Equalization by the deadline, either July 1st of the assessment year or within 30 calendar days after the date of your Value Change Notice, whichever is later. If mailing, ensure your petition is postmarked by the post office no later than the filing deadline.

Attend your hearing before the Island County Board of Equalization. The Board is independent of the Assessor's Office and consists of Island County residents appointed by the County Commissioners who provide an impartial hearing. Present your evidence clearly, including comparable sales data and documentation of property conditions that support a lower valuation.

If the Board's decision is unfavorable, you may appeal to the Washington State Board of Tax Appeals within 30 calendar days of the mailing date of the Board of Equalization's decision. Appeal forms are available on the Island County BOE website or the State Board of Tax Appeals website.

As a final option, if your State Board of Tax Appeals decision is still unfavorable, you may appeal to Superior Court following the procedures and timelines outlined in state law. Consult with a property tax attorney to evaluate whether further legal action is warranted based on your specific case.

Required form: Petition for Appeal form available from the Board of Equalization

Filing Methods

phone:Call the Board of Equalization at (360) 679-7379 to request appeal forms

in-person:Hand deliver to Board of Equalization office at 1 NE 7th Street, Suite 208, Coupeville, WA 98239

mail:Mail petition to Island County Board of Equalization, PO Box 5000, Coupeville, WA 98239 (must be postmarked by deadline)

email:Email submissions accepted (contact BOE office at 360-679-7379 for email address)

Evidence to Bring

Comparable sales of 3-5 similar properties that sold for less than your assessed valueRecent independent appraisal of your property as of the assessment datePhotos and repair estimates documenting property condition issues or defectsDocumentation of assessment errors (incorrect square footage, features, or lot size)Market analysis showing declining property values in your area

Island County Assessor Contact

Island County Assessor's Office

Phone: (360) 679-7303

Address: 1 NE 7th Street, Suite 208, Administration Building, Coupeville, WA 98239

Website: https://www.islandcountywa.gov/158/Assessor

Online Portal: https://assessor.islandcountywa.gov/propertyaccess/PropertySearch.aspx?cid=0

Hours: Monday to Friday, 8:00 AM to 4:00 PM

Tax Exemptions in Island County

Senior Citizen and Disabled Persons Exemption

Varies by income tier - reduction based on combined disposable income, property value, and local levy rates. Can provide full exemption from excess levies, frozen assessed value, or partial exemption on regular levies.

Provides a reduction in property taxes for qualifying senior citizens (age 61+) and disabled persons who own and occupy their primary residence in Island County.

Eligibility: Must be age 61+ by December 31 of assessment year (or age 57+ and surviving spouse/domestic partner of exemption participant, or disabled and unable to work). Must own and occupy primary residence in Washington with combined disposable income at or below Income Threshold 3 for Island County.Deadline: Apply with the Island County Assessor's Office. Once granted, renewal required once every five years based on cycle area. Contact Kayla Perez at (360) 678-7853 for assistance.

Disabled Veteran Exemption

Reduction varies based on disability rating, income level, property value, and local levy rates. Uses same tiered structure as senior/disabled exemption.

Provides property tax relief for qualifying veterans receiving compensation from the U.S. Department of Veterans Affairs for service-connected disabilities.

Eligibility: Must be a veteran receiving VA compensation with either: (1) combined service-connected evaluation rating of 80% or higher, or (2) total disability rating for service-connected disability without regard to evaluation percent. Must own and occupy primary residence with combined disposable income at or below threshold limits.Deadline: Apply with Island County Assessor's Office. Contact office at (360) 679-7303 for application materials and income threshold information.

Property Tax Deferral Program

Defers all qualifying property taxes. Higher income threshold (approximately $67,000 combined disposable income for 2026) than the exemption program.

Allows eligible senior citizens and disabled persons to defer payment of property taxes and special assessments. The Washington State Department of Revenue pays taxes on your behalf, creating a lien on the property with 5% simple interest that is repaid when property is sold or transferred.

Eligibility: Must be age 60+ by December 31 of application year or disabled. Must own and occupy home, have enough equity to secure the State's interest, and have combined disposable income at or below the Deferral Threshold for Island County. Must first apply for Senior/Disabled Exemption to reduce taxes before applying for deferral.Deadline: Apply with Island County Assessor's Office using Deferral Application for Senior Citizens and People with Disabilities and Combined Disposable Income Worksheet. Contact assessor at (360) 679-7303.

Island County Appeal Packet — $49

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Frequently Asked Questions

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

The deadline to file a property tax appeal in Island County is July 1, 2026, or within 30 calendar days of the date your Island County Change of Value Notice was mailed by the Assessor's Office, whichever date is later. If you mail your petition, it must be postmarked by the post office no later than midnight of the deadline. Missing this deadline means you cannot appeal your 2026 assessment and will have to wait until the next assessment year. It is critical to file on time even if you're still gathering evidence, as you can submit additional documentation later but cannot file a late petition.

How do I file a property tax appeal with the Island County Board of Equalization?

To file a property tax appeal in Island County, first obtain a Petition for Appeal form by calling the Board of Equalization at (360) 679-7379 or visiting their office at 1 NE 7th Street, Suite 208 in Coupeville. Complete the petition form with specific reasons why you believe the assessor's valuation is incorrect, and attach supporting evidence such as comparable sales, an independent appraisal, or documentation of property condition issues. You can file your petition by mailing it to PO Box 5000, Coupeville, WA 98239 (must be postmarked by deadline), hand-delivering it to the BOE office, or emailing it per instructions from the BOE. After filing, you will be scheduled for a hearing where you present your evidence to the Board members.

What evidence do I need to win my Island County property tax appeal?

To succeed in your Island County property tax appeal, you must provide market evidence that clearly shows the assessor's valuation is incorrect. The most compelling evidence includes comparable sales of 3-5 similar properties in your area that sold for less than your assessed value within the 12 months prior to the January 1st assessment date. You should also provide a recent independent appraisal conducted by a licensed appraiser, photos documenting any property condition issues or defects, repair estimates for necessary work, and documentation of any assessment errors such as incorrect square footage, wrong number of bedrooms or bathrooms, or inaccurate lot size. Simply stating that your taxes are too high or that you disagree with the value is not sufficient without concrete evidence.

What is the senior citizen property tax exemption worth in Island County?

The senior citizen property tax exemption in Island County provides varying levels of tax reduction based on your combined disposable income, property value, and local levy rates. Qualifying seniors age 61 and older who own and occupy their primary residence may receive full exemption from excess levies, a frozen assessed value that prevents increases, or partial exemption on regular levies depending on their income tier. The exact dollar amount varies by property and income level. For example, seniors with the lowest qualifying incomes receive the greatest benefit, potentially saving several hundred to over a thousand dollars annually. You must apply through the Island County Assessor's Office and renew once every five years. Contact Kayla Perez at (360) 678-7853 for personalized information about your potential savings.

What happens at a Board of Equalization hearing in Island County?

At an Island County Board of Equalization hearing, you will present your case before five board members who are county residents appointed by the County Commissioners and trained in real estate valuation. The hearing is a formal proceeding where you explain why you believe the assessor's valuation is incorrect and present your supporting evidence, including comparable sales, appraisals, photos, and documentation of property defects or assessment errors. The Assessor's Office representative will also attend and present their evidence supporting their valuation. Board members may ask questions of both parties to better understand the property and the evidence presented. After hearing both sides, the Board will issue a written decision that can reduce your assessed value, keep it the same, or in rare cases increase it if the evidence supports a higher valuation.

Can I appeal my Island County property tax assessment online?

Island County does not currently offer a fully online portal for filing property tax appeals electronically through a website. However, you can request appeal forms by phone at (360) 679-7379 from the Board of Equalization, and email submission of petitions may be accepted according to BOE procedures. The primary filing methods are mailing your completed petition to PO Box 5000, Coupeville, WA 98239, or hand-delivering it to the Board of Equalization office at 1 NE 7th Street, Suite 208 in Coupeville. You can access the Island County property search database online at assessor.islandcountywa.gov to review your assessment details and find comparable property sales to support your appeal, but the formal petition must be submitted via mail, in-person, or email per BOE instructions.

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

The amount you can save by appealing your property taxes in Island County depends on how much your property is overassessed and the strength of your evidence. With Island County's median home value of $593,300 and effective tax rate of 0.70%, if your assessment is overvalued by just 10%, you could be overpaying approximately $415 per year in property taxes. If your property is overassessed by 15-20%, your annual overpayment could exceed $600-$830. National statistics show that approximately 25% of homes are unfairly overassessed, paying an average of $1,346 too much annually. A successful appeal not only reduces your taxes for the current year but can also establish a lower baseline for future assessments, resulting in cumulative savings over many years. The key is providing strong comparable sales evidence showing your property's true market value is lower than the assessed value.

What is the median property tax bill in Island County compared to Washington state?

The median annual property tax bill in Island County is approximately $3,999, which is significantly higher than the national median of $2,400 but compares favorably within Washington state. Island County's effective property tax rate of 0.70% is lower than Washington's state median rate of 0.92%, meaning homeowners pay a smaller percentage of their home's value in taxes. However, because Island County's median home value of $593,300 is higher than many other Washington counties, the total tax bill is still substantial at nearly $4,000 per year. The county ranks 29th out of 39 counties in Washington for property tax rates. For comparison, the average homeowner in Island County pays $2,616 according to some data sources, though this varies significantly based on property location, taxing districts, and local levies that apply to your specific property.

Official Resources

Island County Assessor's Office →

Official Island County Assessor website with property information, exemption programs, and assessment details.

Island County Property Search Database →

Online tool to search property values, assessment history, and comparable sales in Island County.

Island County Board of Equalization →

Information about the Island County Board of Equalization, including how to file appeals and hearing procedures.

Washington Department of Revenue Property Tax Resources →

State-level property tax information including exemptions, appeals guidance, and property tax laws in Washington.

For state-wide appeal information including Washington's assessment ratio and deadlines, see our Washington 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 Washington Counties

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← All Washington property tax appeal info

Sources: https://www.islandcountywa.gov/289/Appealing-An-Assessed-Valuation | https://www.islandcountywa.gov/223/Board-of-Equalization | https://www.islandcountywa.gov/158/Assessor | https://www.islandcountywa.gov/269/Exemptions | https://dor.wa.gov/taxes-rates/property-tax | https://www.tax-rates.org/washington/island_county_property_tax | https://www.ownwell.com/trends/washington/island-county | https://propertytaxbystate.com/washington/island-county

Last verified: 2026-07-22