To file either the 1040 (TurboTax) or the 1040NR (Sprintax), you must have either a Social Security number or an ITIN (Individual Taxpayer Identification Number).
If you are required to file either tax return, then you will have to get an ITIN (Individual Tax Identification Number) from the IRS.
The easiest way is to use TurboTax (if you are allowed to file a 1040) to create the return, then take it to a Taxpayer Assistance Center with a W-7. The W-7 applies for the ITIN, which is normally filed with your 1040.
If you can show a person at the Taxpayer Assistance Center your documentation (passport, etc.) then you avoid having to mail your documents and not having them for some weeks or months.
This can also be done by visiting a CAA (Certifying Acceptance Agent) who can "witness" your documents. Note that some CAAs may want to do your tax return as well as accept your W-7 - you will have to ask.
Please also see these links for more information:
Please see this TurboTax page on the W-7.
Also, please see How do I file with a W-7?
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