E-file rejection IND-508: Primary SSN in the Return must not be equal to the Spouse SSN on another tax return for which filing status is Married Filing Jointly or filing status is Head of Household...
This rejection means that the first person on the return (the primary taxpayer) was listed as the spouse (or was used to claim the spouse exemption) on another tax return that has already been filed.
It can occur if your spouse has already filed your joint return, or if s/he filed their own return as Head of Household and put you down as their spouse.
Less commonly, this error can be triggered by an incorrect Social Security number or a fraudulently-filed return that used your SSN as the "spouse."
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