When filing separately, you only need your spouse‘s income to determine your qualifications for the premium tax credit. There may be a workaround to leave it off, or maybe just guess a high enough number that you won’t qualify for the PTC if you already know you don’t qualify. But you won’t be able to e-file without a Social Security number. You will need to file by mail and attach a written statement that gives your spouse‘s name and address, any other identifying information that you have, and a brief explanation of why you don’t have the SSN.
