Marriage to a Swiss citizen who is not a US person changes several US tax rules that felt automatic while you were single. The default filing status becomes Married Filing Separately, gifts to your spouse lose the unlimited marital deduction and are instead subject to a $194,000 annual cap, estate planning requires a QDOT if you want to defer US estate tax, and new reporting duties can appear around gifts and joint foreign accounts. None of this is a reason to panic; it is a reason to understand the landscape and make a few deliberate choices.
The core shift in one line
Your Swiss spouse is not a US citizen or resident. Under US rules, that one fact flips several default settings on your tax return even though nothing else about your life has changed.
Filing Status: Married Filing Separately by Default
As a US citizen married to a nonresident alien spouse, you cannot simply file Married Filing Jointly. The default—and usually the right answer—is Married Filing Separately (MFS). That status generally means higher tax brackets and more limited deductions than joint filing, but it keeps your spouse outside the US tax net. The alternative, the IRC 6013(g) election, is available but almost always should be declined.
The 6013(g) election: what it does and why most couples skip it
If both of you make the 6013(g) election, your spouse is treated as a US resident for the entire tax year. That means both spouses' worldwide income is subject to US tax and, in practice, the couple generally loses the ability to use treaty benefits that would otherwise apply to the nonresident spouse. The election also requires your spouse to have an ITIN and binds you to similar treatment in later years unless you obtain IRS consent to revoke it. For most Americans in Switzerland, this is a poor trade; Married Filing Separately is the cleaner starting point.
The Gift-Tax Gap: $19,000 vs. $194,000
In a marriage between two US persons, gifts between spouses are generally unlimited under the marital deduction. When your spouse is not a US citizen, that unlimited treatment disappears for gift tax purposes. Instead, you get a special annual exclusion of $194,000 for gifts to a non-citizen spouse in 2026, up from $190,000 in 2025. For comparison, the ordinary annual gift tax exclusion for any other recipient remains $19,000 per person in 2026.
The figure to remember in 2026
Gifts to your non-citizen spouse above $194,000 in a single year begin to use your lifetime gift and estate tax exemption of $15,000,000 per person—now made permanent and indexed for inflation from 2027—and are subject to a top rate of 40% once that exemption is exhausted.
$194,000
Special annual gift tax exclusion for gifts to a non-citizen spouse for 2026, up from $190,000 in 2025
Amounts above that special exclusion are taxable gifts. They are not necessarily taxed today; they reduce your lifetime exemption of $15,000,000 per person, which was made permanent by the One Big Beautiful Bill Act effective January 1, 2026. The top transfer tax rate remains 40%.
The Estate-Tax Problem: No Unlimited Marital Deduction Without a QDOT
The same non-citizen gap appears at death. The unlimited marital deduction that normally lets assets pass to a surviving spouse free of US estate tax does not apply when the surviving spouse is not a US citizen. To defer estate tax, assets must pass to a Qualified Domestic Trust, known as a QDOT, under IRC 2056A. Without a QDOT, the estate may face US estate tax sooner than expected—not because the IRS is hunting you, but because the standard deduction simply is not there.
What changed in July 2026
On July 9, 2026, the Treasury issued final QDOT regulations that took effect July 10, 2026. The updated rules modernize the procedures and security requirements for QDOTs—covering how trusts are structured, secured and administered. The changes mostly affect trustees and legal counsel; for you, the practical takeaway is that any existing QDOT should be reviewed against the new requirements, and any new plan should be built on the current rules. A cross-border estate plan is not a one-time document; it needs to be kept current. For a broader look at how this fits into a US expat's estate plan, see Estate Planning for US Expats in Switzerland: Why It Matters and How to Get It Right.
New Reporting Duties: Form 3520, FBAR/Form 8938, and ITIN
Marriage often creates reporting obligations that did not exist before. If you receive gifts from a foreign person—including your nonresident spouse—totaling more than $100,000 in a calendar year, you must report them on Form 3520 Part IV. This is a disclosure form, not automatically a tax bill, but the penalties for not filing can be severe, so treat the threshold seriously. The same Form 3520 used to report inheritances from foreign estates is explained in Inheriting from Switzerland as a US Citizen: Tax, Form 3520, and Probate.
Joint foreign accounts with your spouse can also trigger FBAR (FinCEN Form 114) if the aggregate value of your foreign financial accounts exceeds $10,000 at any point in the year. Depending on your filing status and the account values, Form 8938 may also be required. If you need to file a joint return under a 6013(g) election or certain other forms, your spouse will need an ITIN, requested with Form W-7.
Before and After the Wedding: A Short Checklist
You do not need to resolve every issue on the wedding day, but a few actions can prevent surprises.
- Before the wedding: discuss filing status with your spouse and agree on the Married Filing Separately default unless a professional sees a clear 6013(g) benefit.
- Before the wedding: review any joint accounts or property arrangements you plan to open, and understand the FBAR/Form 8938 thresholds.
- Before the wedding: map out gifting plans above $100,000 so you know Form 3520 will be required.
- After the wedding: update beneficiary designations on retirement accounts, life insurance and Swiss pension assets with both systems in mind.
- After the wedding: build or refresh your estate plan with a QDOT if you want to defer US estate tax for a non-citizen spouse.
- After the wedding: if you made any reportable gifts or have foreign accounts, schedule the filings early rather than at the deadline.
Marriage to a Swiss citizen does not make you a tax outlier; it simply means the ordinary US rules for non-citizen spouses now apply. Most of this is manageable once you see the defaults clearly. The dangerous part is assuming the US system treats your spouse the same way it treats a US citizen spouse—it does not. At US Expat Wealth, we work with Americans in Switzerland to map both systems under one roof, so you can make a clear plan and get on with the life you are building together.