The IRS understands that there can be complications in a relationship and has a publication that I have included below for you. Just go to the table of contents and select Community Income right under Community Property.
After you finish your 2016 tax return, you will not be able to efile because the IRS requires married people filing separately to provide their spouse's information so that they can match specific data. The IRS will reject any attempt at efiling MFS returns without this information. The only option that you have is to paper-file your 2016 tax return. To do this, you would select Paper-File instead of Efile when you are in the File section after completing your return. Then print, sign, date and mail your tax return by April 18, 2017.
https://www.irs.gov/publications/p504/ar02.html#en_US_2016_publink1000176088
Good luck with everything!
