It’s simple for now because no one is looking at it. But it will cause a world of problems for employers who are treating contractors as de facto employees when and if someone does start looking.
I was asking because last year I billed a few times from NL a company registered in Florida. My accountant thought for some reason that I had to inform tax authorities over there. But he didn’t have experience with it.
You start a sole proprietorship and then just invoice your US-based client monthly.
It's very simple for both sides.