<prompt> Human: Im not sure if this is the best sub to post this, so please feel free to direct me elsewhere. My husband paid his ex-wife alimony in 2016 and we wanted to deduct it from our taxes. To do this, however, we need her SSN. He cant find it on their previous tax forms because theyre customer copies from HR Block and per usual, when he sent her an email asking about it, she refused to cooperate probably because she didnt report said alimony on her taxes. From what Ive read, not having her SSN when we report the alimony will result in a 50 fine for us and no alimony deduction.Is there any way around this aside from trying to get a court order for her SSN so we can file?  <response>: You can request previous tax forms from the IRS which would have her social on it. 