Taxes in Sammamish
Washington's no state income tax and Sammamish's roughly 10.1% combined sales tax apply to residents, layered with King County's real, highest-in-Washington effective property tax rate and a capital gains excise tax genuinely relevant given the city's exceptionally high household incomes.
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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 -- particularly relevant given Sammamish's exceptionally high median household income ($239,690-$245,694).
Sammamish's combined sales tax
Sammamish's combined sales tax rate is estimated at approximately 10.1%, slightly below the Bellevue/Kirkland/Redmond urban-core rate -- confirm the current precise rate for a specific address, as this figure was not independently pinned to one confirmed source this pass.
King County's highest-in-Washington property tax rate
Sammamish shares King County's countywide average effective property tax rate of roughly 0.83% -- the highest of Washington's 39 counties -- with every other market in this batch except Bainbridge Island (Kitsap County).
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 Sammamish's genuinely high-net-worth resident base.
Key takeaways
- Washington has no state personal income tax, but does levy a real, current capital gains excise tax (7%-9.9%) directly relevant to Sammamish's high incomes.
- Sammamish's combined sales tax is estimated at approximately 10.1% -- confirm the current precise rate directly.
- 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, relevant given Sammamish's high-net-worth base.
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