If you are not a U.S. citizen or legally registered alien with a green card and a social security number, then you can't even use the TurboTax program at all to file a U.S. tax return, specifically *because* of tax treaties which no version of TTX can handle. You'd have to file the 1040NR return which the TTX program does not have or support. For that, you'll use the service at www.sprintax.com which has no association with TurboTax, other than being referred to that site if/when applicable.
