For most taxpayers in the US state taxes make up a much smaller portion of their total tax burden than federal taxes. So, overall, the tax burden in Washington

For most taxpayers in the US state taxes make up a much smaller portion of their total tax burden than federal taxes. So, overall, the tax burden in Washington isn't so much more regressive than a state with income tax. You can have luxury taxes, but it's hard to match income tax if your goal is to have a fairly progressive tax.