I am required to enter my wife's SSN in the form - she is not a US citizen, has never had one and we live outside the US.

[asbi536833]

Forgot to add I am filing MFS

[Opus 17]

If your spouse is a non-resident alien, does not have a tax number, and you are filing MFS, then you don't have to enter a tax or SSN number for your spouse.  However, you can't e-file without a tax number.  So, you need to print your return and file by mail, and write "NRA" in the space for the tax number.

If turbotax won't let you print without a tax number, you can use a fake number 999-88-9999, then white it out and write "NRA" before you file.