Topic · Filing status
Married to a non-US citizen: filing status, your spouse's income, and the SSN problem
Being married to a foreign national is the most common thing that makes an expat return hard to file at all — and the choice you make in year one is harder to unwind than most people expect.
By Danilson Ramos · Founder, Atamatax
Updated August 2026
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You are American, your spouse is not, and you live abroad. Nothing about that is unusual, and yet it is the fact that most often turns a straightforward return into a stuck one — because before you can report a single number you have to answer a question with long consequences: does your spouse enter the US tax system with you?
Your spouse's own obligation, first
A person who is neither a US citizen nor a US tax resident, with no US-source income and no US connection, generally has no US filing obligation. Marriage to an American does not create one. Whatever you decide about your own return, the default position is that your spouse's foreign salary and foreign accounts are simply outside the system.
The two realistic filing statuses
| Married filing separately | §6013(g) election to file jointly | |
|---|---|---|
| Whose income is on the return | Yours only | Both spouses' worldwide income |
| Standard deduction | The MFS amount | The larger joint amount |
| Brackets | MFS brackets, which compress quickly | Joint brackets, which are wider |
| Spouse needs an SSN or ITIN | Generally an identifying number is still required or the spouse is identified as a nonresident alien | Yes, without exception |
| Spouse's foreign accounts | Not yours to report unless you have an interest in them | Now part of a joint return's reporting picture |
| Duration | Chosen year by year | Continues until revoked |
| Can it be undone | Yes, freely | Revocable once; you generally cannot elect again with the same spouse |
When the election helps, and when it backfires
The election is attractive when your spouse has little or no income: you get joint brackets and the larger standard deduction while adding almost nothing to the taxable side. It becomes a bad trade when your spouse earns well, because their entire foreign income joins yours on a US return, and the foreign tax credit machinery has to absorb the resulting US tax on income the US had no claim to before.
The asymmetry is that the good version is reversible only once. Making the election in a year your spouse earned nothing, then revoking it when their career takes off, closes the door for good.
Head of household, the option people miss
A US citizen married to a nonresident alien can, in defined circumstances, be considered unmarried for filing purposes and use head-of-household status — which has better brackets and a larger standard deduction than filing separately. It requires a qualifying person and the other statutory conditions, and it is worth testing before defaulting to MFS on the assumption that marriage forecloses it.
The identifying-number problem
This is where first filings stall. A joint return requires an identifying number for your spouse. If they are not eligible for an SSN, the route is an ITIN applied for on Form W-7, which is submitted with the return rather than in advance and requires certified identity documentation. It takes time, and it is the single most common reason a return prepared in February is still not filed in July.
Catching up when only one spouse is a US person
If you are years behind, the same choice reappears inside the Streamlined Foreign Offshore Procedures, and it compounds: an election made for a catch-up package applies to every year in it. The certification on Form 14653 is signed by the US person whose conduct is being certified, so a mixed-nationality couple is not certifying jointly about a single history. Decide the status question before the package is assembled, not while it is being signed.
Working out which way to go
- Confirm your spouse has no independent US filing obligation — no US citizenship, no green card, no substantial presence, no US-source income.
- Estimate your own US tax filing separately, with the foreign tax credit or the exclusion applied as appropriate.
- Estimate the joint result, remembering it adds your spouse's full worldwide income.
- Test whether head-of-household status is available before assuming the choice is only between MFS and a joint election.
- Weigh the multi-year consequence, not this year's number: the election continues until revoked and cannot be re-made.
- If you choose jointly, start the ITIN application early — it is the long pole.
See what your situation actually triggers
The free diagnostic maps your household's income, accounts and holdings to the US forms they trigger, and shows the assumptions behind each conclusion.
Authorities cited
- IRC §6013(g) — IRC §6013(g) — election to treat a nonresident alien spouse as a US resident
- IRC §2(b) — IRC §2(b) — definition of head of household
- Form W-7 — Form W-7 — Application for IRS Individual Taxpayer Identification Number (ITIN)
- IRS · international individual FAQ — IRS — Frequently asked questions about international individual tax matters
- IRC §6012 — IRC §6012 — Persons required to make returns of income
- 31 CFR §1010.350 — 31 CFR §1010.350 — FBAR (FinCEN Form 114) filing requirement and $10,000 threshold
- IRS Streamlined Foreign Offshore Procedures — U.S. Taxpayers Residing Outside the United States — Streamlined Foreign Offshore Procedures
- IRS Form 14653 — About Form 14653 — Certification by U.S. Person Residing Outside of the United States (Streamlined Foreign Offshore)
Primary sources (Cornell Legal Information Institute for the US Code and CFR; IRS.gov for forms, procedures, and treaty documents). This page is general information, not individualized tax or legal advice.
Atamatax provides tax preparation support and educational resources. This website does not constitute legal or tax advice.