Get one of your clients prior tax returns.  Her Social will be on there.

Income high enough to file this year.  Haven't filed in past years.  No records available.  Wife won't provide.  Ssn is not available.  How to file without it?

Sounds like a phone call to the divorce lawyer is in order.

I'm wondering if you could start backup withholding on the alimony, maybe that will get her attention.

Divorce finalized prior to 2019? 

Divorce Date 10-1-18

I called spouse lawyer and requested a call to his client to encourage her to provide SSN.  He said.  They hadn't a relationship with client in past 3 or 4 months.  I thanked him for the professional courtesy.(eye roll)

ah, ok @-Dan- . Still good to go with deduction then. 

Yeah, thats a toughie. I thought I saw one person mention looking back at an old tax return while they were married. Thats a good idea. 

I LOVE @rbynaker idea. That would turn sh-t around REAL quick. 

Worst case, paper file with divorce decree stating alimony (unsure if decree states alimony amount).