Married to a non US citizen: your options, and the election you probably shouldn’t make

You are American. Your spouse is not, has never lived in the United States, has no US income, and has no connection to the country beyond being married to you.

Every year you have to decide how to file. The default and the easy option point in different directions, and the easy option is frequently a five figure mistake that cannot be undone.

The default. You file alone, report your own income, and your spouse stays entirely outside the US tax system. Their salary, their savings, their inheritance, their business, none of it is reported and none of it is taxed.

The cost is real: a lower standard deduction than a joint return, compressed brackets, and the loss or reduction of several credits and deductions.

For most Americans abroad it is still the right answer, and here is why. The foreign earned income exclusion and the foreign tax credit typically reduce your US tax to zero or close to it regardless of which brackets apply. A joint return improves brackets you were not going to pay tax in anyway, while permanently exposing your spouse’s entire worldwide income. You are giving up something real to gain something you did not need.

Frequently overlooked and often better than filing separately.

If you have a qualifying child or dependent and you maintain the household, you may be able to file as head of household while your spouse remains a nonresident. The brackets and standard deduction are better than married filing separately, and your spouse still stays out of the system.

There is a specific rule permitting a US citizen married to a nonresident to be treated as unmarried for this purpose. Where you have children and your spouse is nonresident, this should always be checked before defaulting to separate filing.

You may elect to treat your nonresident spouse as a US resident for tax purposes and file jointly. This is the one to be careful with.

The election is made once and applies to all later years until revoked. And revocation is close to permanent: having revoked, the election is generally not available to that couple again.

Tax software asks whether you are married and whether you want to file jointly. Filing jointly produces a lower number on screen. You click it.

What happened is that you brought a person with no US connection into the US tax system, permanently, along with their salary, their family business, their inherited property, and every bank account they hold, all of which are now reportable, with penalties attached to the reporting.

• Your spouse earns more than you. Their income is now taxed by a country they have never lived in.
• Your spouse owns a business. A local company they inherited or built becomes a controlled foreign corporation, with Form 5471 and possibly GILTI attached.
• Your spouse has family assets. Accounts, trusts, and property that were nobody’s business are now reportable on the FBAR and Form 8938.
• You divorce, or they do not want this. You have committed another adult to a foreign tax authority, and unwinding it forecloses the option forever.

The situations where it can be right are narrower and specific: your spouse has genuinely little or no income, you have significant US source income not covered by the exclusion or credits, and the improved brackets produce a real saving that persists year after year. That is a calculation. It is not a checkbox.

Whichever route you take, you will probably need an identifying number for your spouse. Filing separately, you generally need their identifying number or an acceptable notation on the return. Filing jointly, they must have an ITIN.

Start it early. A W-7 sitting in the queue is a common reason a return goes late.

One more thing that catches people, and it is not obvious. Transfers between US citizen spouses are unlimited and untaxed. Transfers to a noncitizen spouse are not. There is instead an annual limit, indexed each year, a substantial figure, but a limit, and amounts above it eat into your lifetime exemption and require a gift tax return.

This matters more than it sounds. Putting your spouse’s name on a jointly purchased property, moving money into a joint account they can access, or transferring an investment portfolio can all be gifts. Couples restructuring their finances after a move do this routinely without knowing there is a threshold. If your spouse is not a US citizen, check the number before you retitle anything.

• Do not let software make this decision. Whatever it shows you, the joint number will usually be lower and the consequences are not on the screen.
• Check head of household first if you have children. It is frequently the best of the three and gets skipped.
• If considering the joint election, run it over five years, not one. It persists, and so does the reporting.
• Inventory what your spouse actually owns before electing, company interests, accounts, trusts, inherited property. That list is what you are volunteering into the US system.
• Talk to your spouse. This is a decision about their financial privacy and their tax exposure, made on your return, and it is close to irreversible.
• If the election has already been made and you now realise what it means, get advice before revoking. Revocation is permanent, and there may be a better sequence.

If you are filing with a non US spouse for the first time, or you have been filing jointly and want to know what it committed you to, a consultation will lay out the three options against your actual numbers.

This article is general information, not tax or legal advice. Thresholds and rules change, and whether any of this applies depends on your specific facts.