Combined sales tax
10.55%, up from 10.35% in Jan 2026
Washington's 6.5% state rate sits underneath a local layer that Seattle and King County each raised by 0.1% for a new public safety sales tax on January 1, 2026, taking the combined Seattle rate from 10.35% to 10.55%, meaningfully higher than many other Washington cities and higher than King County's own unincorporated-area rate. A rate that just moved is exactly the kind of change that leaves a rate table stale if nobody catches it.