Correct, in order to e-file through TurboTax, each taxpayer must have an SSN or an ITIN.
If your spouse doesn’t have a Social Security number or ITIN, you’ll need to apply for one when you mail in your return. To do this, follow steps 1–3 above and then do this:
- Fill out Form W-7 and attach it to your return, as well as all necessary documentation.
- Mail the return to the address specified in the Form W-7 instructions.
Here is a TurboTax article that discusses how to file if your spouse is a nonresident alien.
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