Here's a couple of thoughts that I haven't seen posted yet...
1. Washington has a special tax on personal property (i.e. cars, boats, motorhomes, etc) that is brought into the state, that has to be paid at the time of first registration. It is intentionally identical to the sales tax amount

, but has a provision to give you credit for any similar tax that you've already paid in another state. I think that it has a provision that says it doesn't apply after you've owned the item for a million years, but I'm not sure about that, since I've always been tagged on the deal.
2. Oregon's income tax can be deducted from your federal income tax. Washington's sales tax deduction is provisional - it's never been made permanent, and is due to expire again this year.
3. Oregon's property tax (read: house) is much higher, generally, than Washington's. But again, this is generally deductible.
4. If you live in Washington (e.g. Vancouver), and work in Oregon (e.g. Portland), this is the worst possible scenario. You will pay Oregon income tax on your earnings in that state, and Washington taxes on all your spending in this state. Better to do it the other way around if you're planning on being a border dweller.
5. Overall, Washington's tax rates (and cost of living) are generally quite a bit higher than Oregon's.
Despite all that, I've lived in Washington since I moved here in 1959. There's much more to it than taxes, or we'd all be gone.
