Keeping Your US 401(k) or IRA in Switzerland: Reporting and Tax Rules

The Short Answer: Yes, You Can Keep It — Here's What Changes

Moving to Switzerland doesn't force you to close your 401(k), Traditional IRA, or Roth IRA. You can leave the account exactly where it is, keep contributing where the plan allows it, and let it keep growing. What changes is everything around the account: which country gets to tax it first, what you need to report every year, and — for Roth IRAs specifically — whether Switzerland recognizes it as a retirement account at all. That last point catches a lot of people off guard, so we'll spend real time on it below.

Why Both Countries Get to Tax the Same Account

The US-Switzerland tax treaty has a rule, Article 18, that says pension and retirement account distributions are taxed by your country of residence — meaning Switzerland gets the primary right to tax your IRA or 401(k) once you live there. If that were the whole story, you'd only deal with Swiss tax. But the treaty also has a 'saving clause,' a provision that lets the United States keep taxing its citizens no matter where they live or what a treaty article says. The practical result: Switzerland taxes the distribution, the US taxes it too, and you claim a foreign tax credit on Form 1116 so you're not taxed twice on the same dollar. This treatment applies across the board — Traditional IRAs, 401(k)s, Roth IRAs, SEPs, and SIMPLE plans are all covered under the current US-Swiss competent authority arrangement.

The Reporting Checklist: FBAR, Form 8938, and Your Swiss Return

Because the account sits in a US institution, most people assume it's outside the scope of foreign-account reporting. It isn't — reporting obligations are based on where you live and file, not on where the account happens to be held, and once you're a Swiss resident your US retirement accounts get pulled into the same disclosure framework as any other foreign-held account.

• FBAR (FinCEN Form 114): required if the combined value of all your foreign financial accounts — IRAs and 401(k)s included — exceeds $10,000 at any point in the year.
• Form 8938 (FATCA): required once you cross the relevant threshold, which for married couples filing jointly abroad is $400,000 at year-end or $600,000 at any point during the year.
• Swiss tax return: a Traditional IRA or 401(k) is generally left off the wealth tax schedule (treated like a Swiss pension asset), while a Roth IRA has to be declared as an ordinary investment account, value and all.

The FBAR and Form 8938 obligations run on separate tracks with separate penalties, and it's easy to file one and forget the other, especially in your first year abroad when everything about your tax situation has changed at once. If you want the full mechanics — deadlines, what counts as an 'account,' and how the two filings interact — FBAR Filing for Americans in Switzerland: 2026 Deadlines and Rules walks through it in detail.

How Switzerland Taxes a Traditional IRA or 401(k)

Switzerland generally treats a Traditional IRA or 401(k) the way it treats a Swiss pillar 3a account — a tax-privileged retirement vehicle rather than a regular brokerage account. That means the balance typically isn't added to your assets for cantonal wealth tax purposes while it sits untouched, and you're not taxed annually on growth inside the account. Tax shows up when money comes out: distributions are taxed as pension income under Swiss rules, at rates that are generally more favorable than ordinary income tax. If you take money out before age 59½, though, Switzerland (like the US) tends to treat that as breaking the pension wrapper — the preferential treatment falls away and it's taxed like a regular withdrawal instead. For a broader look at how Swiss authorities categorize US retirement vehicles alongside pillar 2 and pillar 3a, Swiss Pension Plans and US Taxes: Compliance Guide for American Expats is a useful companion piece.

Why Roth IRAs Get Uniquely Bad Treatment in Switzerland

This is the piece that surprises the most people, because it inverts everything the Roth IRA is designed to do. In the US, a Roth IRA is the deal where you pay tax now and everything after that — growth, distributions — is tax-free. Switzerland doesn't see it that way. Because a Roth doesn't match the profile of a recognized Swiss pension product, it gets taxed as an ordinary investment account instead: growth and income inside the account are taxed annually as they occur, the full account value is added to your assets for cantonal wealth tax every year whether you touch the money or not, and distributions are taxable on top of that. None of the tax-free character you were promised on the US side survives the trip across the Atlantic.

If you're holding a Roth and wondering how large this exposure really is in your situation, Why Your Tax-Free Roth IRA Becomes Taxable Income in Switzerland breaks down exactly how the annual growth and wealth tax pieces get calculated.

A Recent Fix: Dividend Withholding Just Got Better

There's genuinely good news on the compliance side. Swiss financial institutions withhold tax on dividends paid by Swiss companies, and separately, US dividends held inside a foreign-owned account used to face steep Swiss-side friction. Under a 2025 update to the treaty framework, IRAs, 401(k)s, and Roth IRAs held by US persons resident in Switzerland now qualify for a 0% Swiss withholding rate on US-source dividends inside those accounts, down from a rate that previously ran as high as 15–30%. New IRS-Switzerland Deal Cuts Withholding on Pension Dividends covers what triggered the change and how to make sure your custodian is actually applying it.

The Big Decision: Keep the Account Open or Cash Out Before You Move

For most people, the math favors keeping the account open rather than cashing out before relocating. A full withdrawal before age 59½ triggers ordinary US income tax on the distribution plus a 10% early-withdrawal penalty — an expensive way to simplify your paperwork. Keeping the account also sidesteps a separate problem entirely: once you're a Swiss resident, most Swiss-domiciled mutual funds and many Swiss-managed portfolios trigger the PFIC rules (a punitive US tax-and-reporting regime for foreign pooled investments). Money that stays inside a US-domiciled IRA or 401(k) never becomes a PFIC question in the first place.

• Keeping the account open: preserves US tax-deferred growth, avoids the PFIC trap of Swiss-domiciled funds, but adds the annual FBAR/FATCA reporting layer and — for a Roth — ongoing Swiss wealth tax.
• Cashing out before or shortly after the move: ends the reporting obligation but usually means immediate US tax, a 10% penalty if you're under 59½, and permanently losing decades of future tax-deferred growth.
• Access matters too: not every US brokerage will keep a Swiss-resident account open. A handful of firms — including Schwab International, Interactive Brokers, and, on a limited basis, Fidelity — still service Americans living in Switzerland, but policies change and it's worth confirming directly rather than assuming.

Where This Gets Personal

Everything above is the shared structure — the treaty article, the reporting forms, the general Swiss treatment of Traditional versus Roth accounts. What it doesn't answer is what's right for your specific mix of account types, your canton's wealth tax rate, your age relative to 59½, and whether you're likely to retire in Switzerland or move back to the US. That's a personal-planning question, not a general one, and it's exactly the kind of cross-border puzzle we work through with clients every day at US Expat Wealth, where American tax rules and Swiss pension and tax rules get looked at together instead of in isolation.