Don't forget the US has federal income tax (even if you only make $30k/yr); Washington doesn't have an income tax but has all sorts of sales tax, and then of course there's the matter of health insurance costs. Choose the wrong plan in the US and get into a car crash through no fault of your own, and suddenly you're declaring medical bankruptcy on minimum wage. How many days of PTO and sick leave is that minimum wage job giving? Is the workplace unionized? How much is rent for that matter? Did you get housing in, say, Sthlm by waiting in line or did you use one of the loopholes? How much does food cost, in the grocery store, eating out, and food delivery. How easy is it to recycle?

There's a lot more thought that should go into a consideration when choosing between two places to live. A simple dollars to SEK comparison doesn't begin to scratch the surface of it.