Taxes in Issaquah
Washington's no state income tax and Issaquah's roughly 10.1% combined sales tax apply to residents, layered with King County's real, highest-in-Washington effective property tax rate and the statewide capital gains excise tax.
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Learn moreNo state personal income tax -- and the fuller picture
Washington has no state personal income tax. As documented in full in bellevue-wa.js, the state's capital gains excise tax (7% on WA-allocated long-term gains up to $1M, 9.9% above per the 2025 SB 5813 amendment) is real, current, legally settled law -- directly relevant to Issaquah's Costco-executive and broader Eastside tech-adjacent workforce.
Issaquah's combined sales tax
Issaquah's combined sales tax rate is estimated at approximately 10.1%, consistent with general King County suburban patterns -- confirm the current precise rate directly for a specific address.
King County's highest-in-Washington property tax rate
Issaquah shares King County's countywide average effective property tax rate of roughly 0.83% -- the highest of Washington's 39 counties -- with every other King County market in this batch.
Washington's state estate tax
Washington levies its own state estate tax on estates above a statewide exemption threshold, distinct from the federal estate tax -- a real, current consideration for Issaquah's Costco-executive resident base.
Key takeaways
- Washington has no state personal income tax, but does levy a real, current capital gains excise tax (7%-9.9%) on high earners.
- Issaquah's combined sales tax is estimated at approximately 10.1%.
- King County's effective property tax rate (~0.83%) is the highest of Washington's 39 counties.
- Washington levies its own state estate tax above a statewide exemption threshold.
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