Hi, I wonder if Turbotax service is applicable to be used outside US. I am from Malaysia.

[Critter-3]

TT has 2 programs ... one for the US tax return and one for the Canadian tax return.  Each can be used from anywhere in the world to complete one of those returns. 

[rjs]

If you are a U.S. citizen or U.S. resident alien you can use TurboTax to file your U.S. Form 1040 tax return. If you are a nonresident alien and you have to file a U.S. tax return, you have to file Form 1040-NR. You cannot do that with TurboTax. There is no TurboTax program for Malaysian tax.

[SteamTrain]

Two "Howevers" are

a)  that if you use any of the "Online" TurboTax programs that requires a software fee, you will likely need a US denominated Credit or Debit card to pay for the software fees.

b)  or if you are able to get hold of, and install the desktop software, you can e-file the  Federal forms, but would again need a US Credit/debit card to e-file the state forms  (except if you need NY state)

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Again, only if not needing to prepare a 1040NR, which TTX doesn't deal with at all.