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  • Writer's pictureSimona

Property Assessments and Taxes in Island County


As a trusted Real Estate advisor, my commitment is to empower my clients with essential insights into the real estate market on Whidbey Island, Washington. One frequently discussed topic among our clients is the intricate workings of property assessments and taxes in Island County. To demystify this process, we recently hosted a presentation by Jason Joiner from People’s Bank, a former Deputy Assessor at Island County. Jason’s expertise has enriched our understanding and enables me to assist my clients better. I am eager to share these valuable insights with you, providing a clearer understanding of how property assessments and taxes operate in Island County.


In Washington State, property taxes in Island County are determined using a budget-based system rather than a rate-based system. This distinction is pivotal for understanding how property tax calculations work. In a budget-based system, the county establishes its annual budget, and property owners contribute a portion of that budget proportionate to the assessed value of their property. This setup means that the total property tax collected is dictated by the county's budget, not by fluctuating property tax rates.

For an in-depth explanation, we suggest viewing this informative YouTube video that simplifies the fundamentals of property assessments and their correlation with taxes.



Under Washington State law, property tax increases are typically capped at 1% annually. However, there are instances where raising the baseline beyond this limit becomes necessary to accommodate rising costs and inflation. This procedure is referred to as a "lid lift," which mandates approval from voters. Essentially, voters may be periodically asked to authorize a lid lift to enable the county to sustain its fiscal obligations without being adversely affected by inflationary pressures.

Living in Island County offers the distinct advantage of comparatively lower property tax rates when compared to other regions across Washington State. This benefit holds substantial value for property owners and is a key factor for prospective residents considering a move to the area.

Island County is divided into six appraisal areas, with county assessors mandated to conduct physical inspections of one area annually. The remaining areas undergo adjustments based on a conservative market-based increase. Known as the "catch-up method," this approach typically results in more noticeable increases in property values during the year when an area is physically inspected.

This method ensures that property assessments accurately reflect market changes and any alterations to the property itself. However, it also means property owners should anticipate potential fluctuations in their assessed values from year to year.

When buying a property, it's crucial to budget for potential increases in property taxes, particularly if the purchase price exceeds the current assessed value. A prudent guideline is to allocate approximately 1% of the purchase price toward property taxes. This conservative approach helps buyers anticipate and prepare for potential tax adjustments, ensuring they aren't surprised by significant increases post-purchase.

The Island County Planning Department furnishes a list of permits to the assessor's office, which utilizes this data to make necessary adjustments to assessed property values. For instance, a permit for replacing a hot water heater might not impact the assessed value, whereas a permit for a new kitchen would likely result in an upward adjustment.

It's crucial to understand that assessors performing physical inspections do not report unpermitted improvements to the planning department. Therefore, while unpermitted improvements may be identified and assessed later on, assessors themselves do not actively report these discoveries.

Property owners have the option to appeal their property assessment if they disagree with it. Upon receiving the assessment notice in June, you have 30 days from the date indicated on the letter to file an appeal with the Board of Equalization. Detailed instructions for filing an appeal are typically provided on the back of the assessment notice. This process enables property owners to present their case and possibly obtain a revised assessment.


It's important to recognize that private sector appraisers typically charge around $800 per appraisal, whereas the Island County Assessor’s office receives approximately $23 per assessment. Despite this substantial disparity in compensation, there is often an expectation from the public for the same level of service and accuracy from county assessors. This contrast underscores the challenges that public sector assessors face in striving to maintain high standards of service with limited resources.


Navigating the complexities of property assessments and taxes in Island County can seem overwhelming, yet it is a crucial aspect of property ownership. Familiarizing yourself with this process empowers you to manage your financial obligations effectively and make well-informed decisions regarding your property investments.

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