If you are married and your filing status is Married Filing Jointly, you must have an SSN or ITIN for your spouse. If you are married and your filing status is Married Filing Separately, your return cannot be filed electronically without your spouse's SSN or ITIN; however, you can mail it in.
Your federal tax return goes to a different location depending on the state that you live in. See this list to determine the location for you. Where to File Paper Tax Returns (irs.gov)
If your spouse is not eligible to get an SSN, they can file Form W-7 with the IRS to apply for an ITIN. Nonresident Spouse
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