My spouse and I live abroad. My spouse has no SSN, does not work in or for a US enterprise and does not file US taxes. Turbotax requires a SSN to complete. Why?

Generally, if you file married filing separately the IRS uses the SSN to match information on the returns.

 You will not be able to e-file your tax return, you will have to print and mail the return. When TurboTax asks for your spouse's Social Security Number (SSN) then enter as a placeholder SSN (we suggest 999-88-9999, 999-88-9998 or 999-88-9987, as those numbers won’t produce any TurboTax program errors in a review check). After you printed your return your will have to white out the placeholder SSN and write "NRA" (for nonresident alien).

Please see How do I print and mail my return in TurboTax Online? for additional information.