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This study focuses exclusively on taxpayers registered with the Washington State Department of Revenue. Using the results of a stratified random sample of audits, this report estimates taxpayer noncompliance for state taxes included on the Department's combined excise tax return. Drawing on multiple years of sample data requires statistically projecting the assessments to a single mid year to account for inflation factors and to create measurable and comparable information.
Revenue will work with businesses that cannot file or pay their taxes on time due to the recent flooding in Washington state. Learn more about disaster relief resources available for flood-impacted businesses and individuals.