Nonresident Spouse Joint Return Election Guide Under Section 6013(g) (2025-2026)
Nonresident return flow (Form 1040-NR)
How a nonresident individual reports U.S.-source income to the IRS.
Classify the income
Effectively connected (ECI) vs. fixed/determinable (FDAP).
Gather U.S.-source documents
1042-S, K-1, or other statements of U.S. income.
Prepare Form 1040-NR
ECI on the main form; FDAP on Schedule NEC.
File and reconcile withholding
Credit amounts already withheld at source.
Key Takeaways
- A nonresident spouse can join a resident or citizen spouse on a joint return only by making the resident-treatment election.
- The election pulls both spouses into full-year U.S. resident treatment and worldwide-income reporting.
- Treaty nonresidency positions are not compatible with the election for that year.
- The signed statement and TIN support should be assembled as part of the return file.
The default rule is separate treatment, but section 6013(g) opens an elective door
Publication 519 says a married couple generally cannot file a joint return if either spouse was a nonresident alien at any time during the year. The same publication also gives the main exception foreign-founder households keep asking about: if one spouse is a U.S. citizen or resident alien at year-end and the other is a nonresident alien at year-end, the couple can choose to treat the nonresident spouse as a U.S. resident.
That election is powerful because it changes the filing posture completely. It is not a small check-the-box preference about rates. It converts the return into a full-year resident filing framework.
The benefit comes with full-year resident consequences
Publication 519 is direct about what happens after the choice is made. Both spouses are treated as U.S. residents for the entire tax year, both are taxed on worldwide income, and both must file a joint return for the year of the choice. The same guidance also says neither spouse can claim under a treaty not to be a U.S. resident while using this rule.
That means the election should never be made by looking only at the standard deduction or the joint brackets. Foreign salary, foreign investment income, and foreign business activity all have to be pulled into the analysis first.
The mechanics matter because the election file is evidence, not just paperwork
Publication 519 says the spouses make the choice by checking the joint-return box, entering the nonresident spouse's name, and attaching a statement signed by both spouses. The statement must declare that one spouse was a nonresident alien and the other a U.S. citizen or resident at year-end and that both choose resident treatment for the entire year. If the nonresident spouse does not have an SSN, the file also needs an ITIN path.
A clean election file therefore includes the signed statement, the identification-number plan, and a worksheet showing why the worldwide-income tradeoff still made sense.
Frequently Asked Questions
Can I file jointly with my nonresident spouse without making an election?
Generally no. Publication 519 says the joint-return route is available only if the spouses choose to treat the nonresident spouse as a U.S. resident under the section 6013 election rules.
Does the election force us to report foreign income too?
Yes. Publication 519 says both spouses are taxed on worldwide income for the year of the choice.
Does my nonresident spouse need an ITIN for the joint return?
Yes, unless the spouse has an SSN. Publication 519 says a nonresident spouse on the elected joint return needs an SSN or ITIN.
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