If your taxes wind up higher, then you have to file your U.S. taxes, but they wind up being minimal to 0, as the U.S. counts the taxes you pay there in lieu of

If your taxes wind up higher, then you have to file your U.S. taxes, but they wind up being minimal to 0, as the U.S. counts the taxes you pay there in lieu of paying to the U.S.. Mostly your extra expense should be in fees paid to one of the tax accountants who actually know their way around these tax laws/treaties.