Filing US Taxes With a Non-Citizen Spouse

Most Americans who marry a non-US citizen abroad make a quiet tax mistake without realizing it: they file as Married Filing Separately and accept the worst available standard deduction, blocked Roth IRA contributions, and higher tax brackets — all because they assumed they had no other option. They did. The IRS allows a US citizen or resident to elect to treat a nonresident alien spouse as a US resident for income tax purposes, unlocking joint-filing benefits and — in the right situation — potentially excluding up to $260,000 of combined earned income under the Foreign Earned Income Exclusion. The decision has major tradeoffs, and it is permanent unless explicitly revoked.

This guide covers the three filing paths available to you, how the §6013(g) election works, when the math favors it, what it costs in treaty benefits, how to get your spouse's ITIN, and the one factor most expat couples miss: once you revoke the election, you can never make it again — not even if you remarry.

The Three Filing Paths for Expats Married Abroad

When a US citizen or resident is married to a nonresident alien (NRA), the default IRS rule is that you cannot file a joint return — the couple has different tax statuses. But the IRS offers an election to change that. Your options are:

• Married Filing Jointly (MFJ) via §6013(g) election: You elect to treat your NRA spouse as a US resident for the entire tax year. Both of you file a joint Form 1040 and report worldwide income together. Requires your spouse to have or obtain an ITIN.
• Married Filing Separately (MFS): No election required. Each spouse files (or does not file, in the case of the NRA spouse) separately. You report only your own income. This is the default if you do nothing.
• Head of Household (HoH): Available if you have a qualifying dependent (child or relative) who lived with you for more than half the year and you paid more than half the household expenses. Gives better rates and a higher standard deduction than MFS.

Each status produces materially different tax outcomes. The right one depends on whether your spouse earns income, which country that income comes from, whether you have qualifying dependents, and what your marginal tax rate is after applying the Foreign Earned Income Exclusion or Foreign Tax Credit.

The §6013(g) Election: Treating Your Spouse as a US Resident

Under IRS rules for nonresident spouses, you may elect to treat your NRA spouse as a US resident for income tax purposes. The legal basis is IRC §6013(g). Once you make this election, both of you are treated as US residents for all federal income tax purposes, for every year the election remains in effect.

The most immediate benefit is filing status: you can file a joint Form 1040 with the larger married filing jointly standard deduction ($30,000 for 2025 for most filers), access to joint tax brackets, and eligibility for tax credits that are restricted or eliminated under MFS.

How to Make the Election

Making the election requires a signed statement attached to your joint return for the first year it applies. The statement must include:

• A declaration that on the last day of the tax year, one spouse was not a US citizen or resident and the other was, and that you both choose to be treated as US residents for the entire year
• The name, address, and taxpayer identification number (SSN or ITIN) of each spouse

If your NRA spouse does not have a Social Security Number (which they almost certainly do not), they must apply for an ITIN using Form W-7 before or simultaneously with the first joint return. The return cannot be e-filed in the year you apply for the ITIN — it must be mailed to the IRS with the W-7 attached. See the ITIN section below for the full process.

You can also make the election retroactively by filing an amended Form 1040-X within the statute of limitations, which is generally three years from the original due date of the return.

What the Election Costs: Worldwide Income and Treaty Benefits

The election has two significant costs that many couples overlook.

Your NRA spouse's worldwide income goes on the US return. If your spouse earns $80,000 a year at their local job in Mexico City, that $80,000 is now reportable US income. You will need to apply the Foreign Tax Credit (FTC) for any Mexican taxes paid on that income to avoid double taxation. In high-tax countries like Germany, France, or the UK, the FTC typically covers the full US tax liability on the foreign-source income. In low-tax or no-tax countries (UAE, Panama, parts of Southeast Asia), the FTC may cover little or nothing — meaning your spouse's previously non-US-taxable income is now partially taxed in the US.

Treaty residency benefits are suspended. Per IRS rules, neither spouse can claim tax treaty benefits as a resident of a foreign country for any year the §6013(g) election is in effect. If you were relying on a US tax treaty to reduce withholding on investment income or to claim treaty-exempt pension income, making this election eliminates that. Certain treaty provisions may still apply — a qualified tax professional can review your specific treaty language — but the blanket treaty-residency claims are off the table. Review the US tax treaty and saving clause guide before making the election if treaty benefits matter to your situation.

FBAR: Does the Election Apply to Your Spouse?

No. FinCEN has clarified that the determination of whether an individual is a US resident for FBAR purposes is made "without regard to elections under section 6013(g) or 6013(h) of the Internal Revenue Code." Making the §6013(g) election does not make your NRA spouse subject to FBAR requirements for their own foreign accounts.

This is different from the §7701(b) first-year election (a separate procedure for people who were not US residents for the full year), which can trigger FBAR obligations. The §6013(g) spousal election does not.

As the US citizen, you remain subject to all existing FBAR and FATCA requirements. If you hold a joint account with your spouse, you must report it on FinCEN Form 114 if the aggregate of your foreign accounts exceeds $10,000 at any point during the year.

Married Filing Separately: The Default and Its Traps

Filing as Married Filing Separately is the automatic path if you take no action. It is sometimes the right choice, but it carries several penalties that many expats do not realize apply to them specifically:

• Lower standard deduction: $15,000 for 2025, versus $30,000 for MFJ — costing you roughly $15,000 of tax-free income at your marginal rate
• Roth IRA phase-out starts immediately: If you file MFS and your MAGI exceeds $10,000, you cannot contribute to a Roth IRA. At all. The phase-out range that applies to single filers ($150,000-$165,000 for 2025) does not apply to MFS. This is a significant retirement savings cost for anyone earning above $10,000 while using MFS — see the expat retirement account guide for the full MFS impact on contributions
• No student loan interest deduction
• No Earned Income Credit
• Higher marginal rates: MFS uses the same brackets as single filers except the 37% bracket starts at $626,350 versus $751,600 for MFJ (2025 figures)
• Social Security: up to 85% taxable with an income floor that hits sooner for MFS filers

The only scenario where MFS clearly wins is when your NRA spouse has significant income in a low-tax country that would be dragged onto your US return under an MFJ election, generating a US tax bill that exceeds everything you gain from joint filing.

Head of Household: The Often-Overlooked Option

If you have a qualifying dependent — a child or qualifying relative for whom you provide more than half the support and who lives with you for more than half the year — you may be eligible to file as Head of Household even when married to a nonresident alien, provided you lived apart from your spouse for the last six months of the year.

Head of Household gives you a $22,500 standard deduction (2025) versus $15,000 for MFS, and more favorable tax brackets than MFS. For expats with children, this is often better than MFS and worth checking before defaulting to that status.

FEIE and the Spouse Election: Double the Exclusion

If you make the §6013(g) election and your NRA spouse also qualifies for the Foreign Earned Income Exclusion — meaning they have earned foreign income and meet either the bona fide residence test or the physical presence test — your spouse can claim their own FEIE on the joint return.

For 2025, the FEIE limit is $130,000 per qualifying person. A couple where both spouses qualify can exclude up to $260,000 of combined earned income from US taxation on a joint return. For many expat couples, this is the single most compelling reason to make the election.

The Foreign Tax Credit and Your Spouse's Income

When your NRA spouse's income is on the US return, the Foreign Tax Credit is what prevents double taxation. For every dollar of foreign income tax your spouse pays to their country's government, you can claim a dollar-for-dollar credit against your US tax liability on that same income — subject to the basket and limitation rules under IRC §904.

Whether the FTC fully neutralizes the US tax on your spouse's income depends on the effective tax rate in their country:

Country / Tax Level	Example	FTC Coverage of US Tax on Spouse's Income	Election Impact
High-tax (30%+)	Germany, France, UK, Canada	Full — foreign taxes likely exceed US tax	Election usually neutral or slightly positive
Moderate tax (15-30%)	Mexico, Colombia, Spain	Partial — some US tax likely remains	Depends on spouse's income level; model it
Low tax (0-15%)	UAE, Bahrain, Panama, Paraguay	Minimal — most of spouse's income becomes US-taxable	Election is often costly unless spouse earns under FEIE limit
No tax	Tax-free country with zero income tax	None — full US tax on spouse's income	Election is usually harmful unless FEIE covers full amount

The interaction between the FEIE and the FTC adds a wrinkle: you cannot apply the FTC to income already excluded by the FEIE. If your spouse's income is fully covered by the FEIE, the FTC becomes less relevant. If the spouse earns above the FEIE limit, the FTC becomes the primary shield against double taxation on the excess. See the FEIE vs. Foreign Tax Credit comparison for the mechanics.

When the Election Helps — and When It Doesn't

Getting Your Spouse's ITIN (Form W-7)

To file a joint return with an NRA spouse, the NRA spouse needs an Individual Taxpayer Identification Number (ITIN). This is applied for using IRS Form W-7.

Key facts about the W-7 process:

• Cannot be e-filed: Form W-7 must be mailed or submitted through an IRS-authorized Certifying Acceptance Agent (CAA). The entire return must be paper-filed in the year of first application
• Documentation required: The IRS requires original documents or copies certified by the issuing authority (not notarized copies). A valid foreign passport submitted with the W-7 satisfies both the identity and foreign status requirements in a single document
• Processing time: 7-11 weeks outside tax season; up to 14 weeks during peak filing season (January 15 through April 30). Plan accordingly — if you are applying in February, your return will not be processed until well after the April 15 deadline, and you may need to file for an extension
• ITIN expiration: An ITIN expires after 3 consecutive tax years of non-use (it expires on December 31 of the third year). If your spouse's ITIN expires, it must be renewed before the joint return can be processed
• Where to mail: Internal Revenue Service, ITIN Operation, P.O. Box 149342, Austin, TX 78714-9342

Alternatively, if your spouse can visit a US embassy, consulate, or an IRS Taxpayer Assistance Center in the US, a Certifying Acceptance Agent there can verify original documents without you having to mail your spouse's passport. This is often the safer route for anyone who cannot afford to be without their passport for 3-4 months.

Source: IRS — Nonresident Spouse rules and Instructions for Form W-7, checked June 2026.

Revoking the Election: The Once-in-a-Lifetime Rule

The §6013(g) election continues indefinitely until revoked. Either spouse may revoke it, even without the other's consent. Revocation is effective for the first tax year after the year in which you notify the IRS, unless the couple mutually agrees to an earlier date.

Here is the critical fact: once revoked, neither spouse can make this election again for any future tax year — even if married to a different person later. The IRS is explicit about this. If you revoke and your circumstances change (your spouse's income drops, or you move to a high-tax country where the election would now benefit you), you are locked out permanently.

The election also ends automatically — but not permanently — if neither spouse qualifies as a US citizen or resident for a given tax year. This is a suspension, not a full end; you can resume the election when one spouse again qualifies as a US resident. The election also ends permanently on the death of either spouse, legal separation under a final divorce decree, or inadequate recordkeeping (if the IRS determines you cannot substantiate your compliance with the election's reporting requirements).

Decision Checklist

• Does your NRA spouse have earned income? How much, and from which country?
• What is the income tax rate in your spouse's country? Does a US-[country] tax treaty exist?
• Will your spouse independently qualify for the FEIE (bona fide residence or physical presence test)?
• Do you have qualifying dependents who could support a Head of Household filing status instead?
• Are you planning to contribute to a Roth IRA? MFS blocks contributions above $10,000 MAGI
• Are you claiming treaty benefits as a resident of your country of residence? If so, the §6013(g) election eliminates those
• Does your spouse have foreign accounts over $10,000? (They will NOT owe FBAR under §6013(g), but you still must report any joint accounts)
• Are you prepared for the paper-filing requirement and 7-11 week ITIN processing delay in the first year?
• Have you modeled the full-year tax comparison for all three statuses (MFJ, MFS, HoH) with actual income figures before making a choice?

Conclusion

The nonresident alien spouse election is one of the most consequential and least-discussed decisions in expat tax planning. It permanently changes how both spouses are treated under US tax law, and it cannot be made a second time if revoked. The couples who benefit most from the §6013(g) election are those where the NRA spouse earns under the FEIE limit, or earns significant income in a high-tax country where the FTC fully offsets the US liability on their income. Couples where the NRA spouse earns substantial income in a low-tax jurisdiction — common in Gulf countries, Panama, Paraguay, and parts of Southeast Asia — often find the election is an expensive mistake.

Run the numbers for all three filing statuses before the first year you are eligible, ideally with a US expat tax professional who can model the FEIE and FTC interaction for your specific income mix. The analysis is worth every dollar it costs — the election, once made, governs every future return.

For the broader framework of how US taxes work when living abroad, see the US expat banking and taxes guide.

Sources checked

• IRS — Nonresident Spouse (§6013(g) Election Rules)
• IRS Publication 519 — US Tax Guide for Aliens (2025)
• IRS — Instructions for Form W-7 (December 2024)
• FinCEN — FBAR Filing for Spouses

Disclaimer: This article is for general informational purposes only and does not constitute legal or tax advice. Tax rules for nonresident alien spouses are fact-specific and can vary based on your country of residence, treaty status, and income structure. Consult a qualified US international tax professional before making or revoking a §6013(g) election.