Starting July 1, 2013, the interest on fuel taxes owed to Washington State from your IFTA tax return will be based on rates established by the Internal Revenue Service. For details, see Interest charged on late returns.
Learn how to apply for an IFTA license and get your decals.
Find out how to file your quarterly IFTA tax return in Washington, and how to get copies of your returns.
IFTA requires motor carriers to keep detailed records for each vehicle. Find out what’s required.