E-file rejections IND-508: Primary SSN in the Return must not be equal to the Spouse SSN on another tax return
A return that was rejected with Primary SSN in the Return must not be equal to the Spouse SSN on another tax return (IND-508) usually occurs because somebody else filed a joint return and used your Social Security number for their spouse.
First, find out if your spouse already filed your joint return. If they did, and you want to file separately, you should file a paper return, but expect a future contact from the IRS asking you and your spouse to straighten out which filing status(es) the both of you want to use.
On the other hand, if your spouse didn't file your return (or you don't have a spouse) go back to the Personal Info section, click Edit next to your name, and double-check your Social Security number. Correct it if neeced, then go through the File section again to resubmit your return.
But what if my Social Security number is correct?
It's likely that another taxpayer, inadvertently or otherwise, filed their return using your Social Security number.
We strongly recommend that you check our resources in this article - What to do if you suspect tax-related identity theft. You can also click here for additional information at IRS.gov.
You won't be able to fix this rejection; you'll need to file a paper return.