Were any of your past returns--like 2023 or earlier--filed jointly? Did you try looking at your old returns for the SSN? And....your "ex" needs your SSN just as much as you need his so that he can file MFS. Is it too contentious to just give each other the SSN's?
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
