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US citizen married to non-resident alien; how do I file taxes?
From what you've described, your spouse is a non-resident alien for US tax purposes. You have two choices: Use the Nonresident Spouse Treated As Resident election and file as Married Filing Jointly. Since your spouse doesn't have, and doesn't currently qualify for, an SSN, he/she will need to apply for an ITIN together with the tax filing. Note that by becoming a resident alien, your spouse's worldwide income the whole year would be subject to US taxes, and would need to be reported on your joint tax filing, though he/she will be able to use the Foreign Earned Income Exclusion to exclude $100k of her foreign earned income, since he/she will have been out of the US for 330 days in a 12-month period. Or, file as Married Filing Separately. You write "NRA" for your spouse's SSN on your tax return. As a nonresident alien, if your spouse doesn't have any US income, he/she doesn't have to file a US tax return, and doesn't need to apply for an ITIN. Which one is better is up to you to figure out.