Also note ... if the spouse filed jointly but did NOT put your income on the return then that return will have to be amended to add your income.
Now if they did not have permission to file a joint return then and only then could you file a separate return after the filing deadline. You will need to add an explanation to the paper filed return for it to be accepted. And the spouse will have to amend their return as well with a written explanation of why there is an unallowed change in the filing status. You may want to think this over long and hard before choosing this option.
