I’m getting divorced and I don’t have my soon to be ex wife social security number, how do I continue filing?

[Bsch4477]

Assuming you filed jointly in the past, look at your previous return. 

[rjs]

Or ask your wife for her Social Security number. If she won't give it to you, talk to your divorce lawyer.

Are you filing as married filing separately? You cannot file jointly unless your wife agrees and cooperates.