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International Registration Plan (prorate)
Learn the easy way to license commercial vehicles operating in more than one state.
Fuel tax
See information about various fuel taxes in Washington state, including information about dyed diesel and potential fuel tax refunds.
International Fuel Tax Agreement (IFTA)
Get information about IFTA licenses, tax returns, and recordkeeping requirements for carriers operating in more than 1 state or province.
News and updates
Read about recent and upcoming changes affecting Fuel Tax, IFTA, IRP, and Prorate customers.
Laws and rules
Learn about current prorate and fuel tax laws and rules, and view recent rulemaking activity.