To get an online transcript or a copy by mail visit the IRS website. If you can't get your spouse's SSN you can't e-file. Leave the box blank and print and mail in your return. Attach a statement to explain your situation.
If you meet the qualification to be "considered unmarried" you might be able to file as Head of household.
To be Considered Unmarried:
1. You file a separate return
2. You paid more than half the cost of keeping up your home for the tax year.
3. Your spouse did not live in your home during the last 6 months of the tax year. Your
spouse is considered to live in your home even if he or she is temporarily absent due to special circumstances.
4. Your home was the main home of your child, stepchild, or foster child for more than half the year.
5. You must be able to claim an exemption for the child.
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