Washington has no state income tax on wages, so your paycheck is reduced only by federal income tax, Social Security, Medicare and whatever benefits you elect. On the statewide median household income of $95,000, that is worth several thousand dollars a year compared with a typical taxing state.
No wage income tax; a capital gains excise tax applies to large gains. Statewide median household income is $95,000, which is the default loaded above.
Remember that a state with no income tax is not automatically cheaper overall. Washington has an effective property tax rate of 0.83% and average homeowners insurance of $1,200 a year — states without wage income tax typically recover revenue through property or sales taxes.