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

Published August 2026 · Updated September 2026

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.

This matters more than it sounds. Every choice below is a choice about whether to voluntarily bring income that is currently outside US tax into it — permanently and worldwide, not just for the year you are trying to file.

Whose accounts are actually in scope

The question people open with is rarely about filing status. It is: which of my spouse's things do I now have to report? The answer is narrower than most people fear, and it turns on your own interest in each account rather than on the marriage.

The account	On your FBAR?	On Form 8938?	The rule behind it
Your own account, held alone	Yes, if the combined peak is over the threshold	Yes, if you meet the threshold	Your account, your report. The simple case.
A joint account with your spouse	Yes — reported at its full value, not half	Yes	The FBAR reports the maximum value of the account, not your share of it. Halving a joint balance is a common and consequential mistake.
Your spouse's own account, no interest of yours	No	No — unless you file jointly	You report accounts you have a financial interest in or signature authority over. Being married to the holder is neither.
Your spouse's account you can sign on	Yes — signature authority is reportable even with no ownership	Generally no; 8938 follows ownership	The two forms genuinely differ here, which is why one answer for both is wrong.
Any account, if you make the §6013(g) election	Assessed on the joint return's facts	Assessed on the joint return's facts	Electing to treat your spouse as a US resident brings their worldwide position into the system.

Two traps in that table. A joint account is reported at its full maximum value, not your half. And signature authority on your spouse's account is reportable for the FBAR even though you own none of it — the classic case being an elderly parent's or a spouse's account you were added to for convenience.

Do you need my spouse's income?

Only if you elect to file jointly, and that is a consequence of the choice rather than a precondition for making it. Filing separately, your spouse's foreign salary is not reported on your return and their figures are not needed to prepare it.

What is needed either way is enough to compare the two routes — usually an approximate figure for your spouse's income and the foreign tax on it. An estimate is enough to model the decision; the full documentation only becomes necessary if you actually elect. Anyone asking for your spouse's complete tax file before that choice is made is collecting more than the question requires.

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.

Atamatax prepares the return and its schedules from the facts you enter, including the filing status you choose. Form W-7 is out of scope for the package — the ITIN application runs alongside the return — and the §6013(g) election is yours to make — a decision with multi-year consequences that belongs to you.

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

Free case scoping maps your household's income, accounts and holdings to the US forms they trigger, and shows the assumptions behind each conclusion.

Build my case scope

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 — 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.

Frequently asked questions

Does my non-US spouse have to file a US tax return?#

Generally no. A spouse who is not a US citizen or US tax resident, with no US-source income and no US status, has no US filing obligation of their own, and marrying an American does not create one. What you decide about your own filing status can change that — which is exactly why the decision deserves attention.

Should I file married filing separately or elect to file jointly?#

It depends chiefly on your spouse's income and on how long you expect the answer to hold. With a low-earning spouse the joint election buys wider brackets and a larger standard deduction at little cost. With a well-paid spouse it pulls their entire worldwide income onto a US return. The election continues until revoked, and revoking it generally prevents you making it again with the same spouse — so model several years, not one.

How do I file when my spouse has no SSN or ITIN?#

A joint return requires an identifying number for your spouse, so if they are not eligible for an SSN you apply for an ITIN on Form W-7, submitted with the return along with certified identity documents. Filing separately avoids that dependency but has its own cost in brackets and deduction. Form W-7 is out of scope for the package; the ITIN application runs alongside it.

Can I be head of household if I am married to a non-US citizen?#

In defined circumstances, yes. A US citizen married to a nonresident alien can be treated as unmarried for filing purposes where the statutory conditions — including a qualifying person — are met, which gives better brackets and a larger standard deduction than filing separately. It is worth testing rather than assuming marriage rules it out.

Do I report my spouse's foreign bank accounts on my FBAR?#

An account your spouse owns alone, in which you hold no financial interest and over which you have no signature authority, is not yours to report. A joint account is a different matter and generally is reportable by you. Electing to file jointly changes the reporting picture for the return, and it is one of the consequences worth weighing before making the election.

How does Streamlined work when only one spouse is a US person?#

The certification on Form 14653 is signed by the US person about their own conduct, so a mixed-nationality couple is not jointly certifying a single history. The filing-status choice still has to be made, and it applies across every year in the package rather than year by year. Settle the status question before the package is assembled.