Washington Clarified Tax Rules for Software Development
New interim guidance from the state separates development services from royalty income for master software copies.
Updated on Oct. 9, 2026 in Software
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The Washington Department of Revenue has issued interim guidance that excludes master copies and retained rights from the statutory definition of computer software. This distinction dictates how various components of custom software projects are taxed within the state.
Why it matters
By defining these elements as outside traditional software tax categories, the state has established how companies must bifurcate project costs. This prevents development work from being incorrectly classified for Business and Occupation (B&O) tax reporting.
The guidance splits costs into two buckets: development work incorporated into a master copy is taxed as professional services, while compensation for retained intellectual property rights is taxed as royalty income.
The players
Washington Department of Revenue
The state agency responsible for the administration of tax laws and regulatory guidance for businesses operating within Washington.
The details
The Department of Revenue determined that master copies and retained rights fall outside the state's standard statutory definition of computer software. Consequently, development work integrated into a purchaser's master copy is now subject to the service and other activities B&O tax. Conversely, payments for intellectual property rights kept by the developer are classified as royalty income, subjecting them to different tax rates.
Timeline
October 8, 2026: Washington Department of Revenue issued interim tax guidance.
The Tech Race
This guidance clarifies how software engineering activities map to existing Washington Business and Occupation (B&O) tax categories. It follows a pattern of state agencies refining tax codes to keep pace with modern digital product development.
Software companies operating in Washington must now categorize their project invoices to distinguish between professional services and royalty-based intellectual property. This shift will require accounting teams to update billing structures to align with the new tax classifications.
The takeaway
Businesses should review their current development contracts to ensure compliance with the new service versus royalty bifurcations. Watch for final rulemaking updates from the Department of Revenue as the state transitions this interim guidance into permanent policy.
Further reading
For more on how technical product development interacts with state regulations, visit the Software section.
Source note: This article includes information reported by Bloombergtax.
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