Filing with a Spouse Who Is Not a Resident

Many people on a work visa are married to someone who is not a US resident for tax: a spouse still living abroad, one who arrived late in the year, or one on a dependent visa who does not pass the substantial presence test. The default rules for that household are unfriendly. You cannot simply file a joint return, and the alternatives can mean a noticeably higher tax bill. There is an election that lets you file jointly, but it brings your spouse's worldwide income and accounts into the US system with it. This chapter explains the three ways to file, shows the tax under each for two common cases, and lists what the election costs beyond the tax.

Why the default is expensive

A married couple can normally file a joint return only if both spouses are US citizens or residents for the whole year. If you are a resident and your spouse is a nonresident alien, IRS Publication 519 gives you three main routes.

Married filing separately. You report only your own income. For 2026 the standard deduction is $16,100, and the brackets are the same as a single filer's up to the 35% bracket, where they become narrower. Many credits are reduced or unavailable on a separate return.

Head of household. A resident for the whole year who is married to a nonresident alien is treated as unmarried for this purpose if the spouse does not elect resident treatment. If you also pay more than half the cost of keeping up a home for a qualifying person, such as a child who lives with you, you may file as head of household, with a $24,150 standard deduction and wider brackets. A spouse alone is not a qualifying person.

The election to treat your spouse as a resident. Under section 6013(g), a US citizen or resident married to a nonresident alien can choose to treat the spouse as a resident for the whole year. You then file jointly, with the $32,200 joint standard deduction and joint brackets, and, in Publication 519's words, both spouses report worldwide income. A related election, under section 6013(h), covers a couple where one spouse becomes a resident during the year and is a nonresident at the start of it.

Two cases, computed

The first case is a spouse with no income: an H-4 spouse without work authorisation, or a spouse at home who is not working.

On wages of $150,000, filing separately costs $24,734 in 2026 federal income tax, with the top bracket at 24.0%. Filing jointly after the election, with no income from the spouse, the tax falls to $15,340, and the top bracket to 22.0%. When the spouse has little or no income, the election usually lowers the tax, sometimes by a large amount, because the joint deduction and brackets are twice as wide.

The second case is a spouse who earns abroad. Under the election, that income is added to the joint return.

If the spouse earns enough abroad to bring household income to $210,000, the joint tax before any credit is $28,540, more than the $24,734 the resident spouse would pay filing separately on their own wages. Whether the election still wins then depends on the foreign tax credit (chapter 3): if the spouse's country taxed that income, the credit can offset US tax on it, up to the US tax on the foreign share of income. Where the other country's tax is close to or above the US rate on that income, the election can still come out ahead; where the spouse's income was taxed lightly or not at all, it usually costs more.

The nonresident spouse calculator compares all three routes with your figures, including head of household and a simplified foreign tax credit, and finds the spouse income at which the election stops paying. It is the right tool for this decision, because the comparison depends on both incomes, the foreign tax paid and whether you qualify as head of household.

What the election brings with it

The tax comparison is only half the decision. Once the election is made:

• Worldwide income. The spouse's income from everywhere goes on the US return each year: salary abroad, interest, rent, gains.
• Accounts and funds. The Form 8938 instructions name a nonresident alien who elects to be treated as a resident as a "specified individual", so the spouse's foreign assets count toward Form 8938 (chapter 2), on the joint thresholds. Foreign mutual funds the spouse holds raise the PFIC questions in chapter 4. FinCEN's FBAR instructions define a US resident by the section 7701(b) residency tests and do not mention this election, so whether the spouse must also file an FBAR is worth confirming with a professional.
• An identification number. Both spouses need a Social Security number or an individual taxpayer identification number (ITIN). A spouse without an SSN usually applies for an ITIN with the first joint return.
• It lasts. The choice stays in effect for later years until it is suspended or ended. It is suspended, not ended, for any year in which neither spouse is a US citizen or resident at any time, and it resumes if one of you becomes a resident again. It ends if either spouse revokes it, or in the other ways Publication 519 lists, and once it has ended, Publication 519 says neither spouse can make it again for any later year. Revoking it is a decision to make deliberately.

The election is made by attaching a statement, signed by both spouses, to the first joint return for which it applies; Publication 519 lists what the statement must contain.

How to decide

A short way to frame it:

1. If the spouse has little or no income and few assets abroad, the election usually lowers tax and adds little paperwork.
2. If the spouse earns abroad and pays tax there at a rate close to the US rate, compute it: the credit may keep the election worthwhile.
3. If the spouse has substantial income taxed lightly abroad, or large foreign funds and accounts, filing separately or as head of household may cost less in tax and in reporting.
4. Look ahead. A spouse who will move to the United States next year and become a resident anyway may change the answer for both years.