No. If you are still legally married you cannot file as Single. Your choices are married filing jointly or married filing separately OR---if you are the custodial parent of the children you might be able to file as Head of Household. Do you have the children? Have you lived apart for at least the last six months of 2020?
Your soon to be "ex' needs YOUR SSN in order to file, too. If you just cannot get the ex to cooperate at all--even through your attorney-- then file separate returns and hand write NOT AVAILABLE for his SSN and mail your return--you will not be able to e-file it.
Another thing to try---did you file joint returns in the past? Get a transcript or a copy of a past return from the IRS...his SSN will be on it.
https://www.irs.gov/individuals/get-transcript
Or you can pay the IRS $43 for an actual copy of your tax return which will include copies of your W-2’s
https://www.irs.gov/pub/irs-pdf/f4506.pdf
**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.**
