U.S. taxes for Americans in Switzerland: what to file, and how to catch up.
Americans in Switzerland still file a U.S. return every year, and Swiss banks know exactly who their American clients are; many will only keep you if your U.S. filings are in order. Catching up is usually straightforward. Pillar 2, Pillar 3a and Swiss funds need care, and in low-tax cantons the U.S. bill can be bigger than the Swiss one.
Sound familiar?
- Your Swiss bank asked for a W-9 or threatened to close your account.
- You pay into a Pillar 3a because it saves Swiss tax.
- You moved for work at an international company and stayed.
- You hold Swiss funds through your bank.
How does the IRS treat Swiss pensions and bank accounts?
Every one of these goes on your FBAR. What differs is how the IRS taxes them.
| Account | U.S. treatment | |
|---|---|---|
| Pillar 2 (BVG / pension fund) | The treaty doesn’t shelter it for U.S. citizens living in Switzerland. Employer contributions and growth could be taxable for the U.S., depending on the plan; the rules aren’t settled. | Check first |
| Pillar 3a | U.S. treatment is debated. Growth may be taxable, and some 3a products hold PFICs. | Watch out |
| Swiss funds | Usually PFICs (Form 8621), with complex reporting and tax rules. | Watch out |
| Swiss bank accounts | Interest is taxable, and the accounts count toward your FBAR total. | Taxable |
| Swiss withholding tax (35%) | Taken from Swiss dividends and interest, then refunded or credited to Swiss residents, so only the Swiss tax you finally bear counts toward the foreign tax credit. | Check first |
| Swiss wealth tax | Not an income tax, so it doesn’t reduce your U.S. tax. | Plan ahead |
Which Swiss investments are PFICs?
Swiss funds and ETFs, and the European funds that Swiss banks put in their portfolios and in many 3a products. For U.S. tax they’re passive foreign investment companies, or PFICs, with their own reporting and harsh default tax rules.
- Each fund needs its own Form 8621 in most years, and gains can be taxed at the top U.S. rate plus an interest charge, unless an election was made in time.
- A managed portfolio at a Swiss bank can hold a dozen or more funds, each its own form, which is why bank mandates are often the costliest part of a Swiss filing.
- Not PFICs: shares of individual companies, bonds, and bank deposits. A 3a held as a bank savings account, rather than in funds, is far simpler.
What does the U.S.–Switzerland tax treaty actually say?
The treaty was signed in 1996, and a protocol on exchanging tax information, signed in 2009, took effect in 2019. For Americans living in Switzerland, these parts matter most:
- The saving clause. The U.S. can tax its citizens as if the treaty didn’t exist, except for the provisions the treaty lists.
- Swiss pensions. The treaty doesn’t give U.S. citizens living in Switzerland the deferral on Pillar 2 and Pillar 3a that some U.S. treaties give for local pensions, which is why their U.S. treatment is debated.
- Relief from double tax. The U.S. gives a credit for Swiss federal, cantonal and communal income taxes on the same income.
- Information exchange. Since 2019, the IRS can ask Swiss authorities for bank information in group requests, on top of what Swiss banks already report under FATCA.
AHV/AVS contributions are covered by a separate U.S.–Switzerland social security agreement, which generally means you pay into one system, not both. Read the U.S.–Switzerland tax treaty on IRS.gov.
When are Swiss and U.S. taxes due?
Both tax years run January to December, so each Swiss year lines up with one U.S. return. Your Lohnausweis (salary certificate) and tax assessment give most of what the U.S. return needs.
| Switzerland | United States | |
|---|---|---|
| Tax year | January to December | January to December |
| Annual return | Usually March 31, with extensions common; the date depends on your canton. On a B permit you’re usually taxed at source instead, and above CHF 120,000 a year you file a full return. | April 15, moved to June 15 automatically when you live abroad, or October 15 with an extension |
| Paying the tax | Installments or a final bill from the canton, or withheld at source | April 15, even if you file later |
| Foreign accounts | Listed with your assets on the Swiss return | The FBAR, due October 15, filed online |
Foreign tax credit or exclusion: which wins in Switzerland?
It depends on your canton and your salary, more than almost anywhere in Europe. Swiss income tax is federal, cantonal and communal, and the total varies widely.
- In higher-tax cantons, like Geneva or Vaud, Swiss tax on a salary is often close to or above the U.S. tax, and the foreign tax credit covers most or all of it.
- In low-tax cantons, like Zug or Schwyz, Swiss tax can be well below the U.S. tax. Then the foreign earned income exclusion, up to $130,000 for 2025, plus the housing exclusion, does more, and the credit covers what it can of the rest.
- High salaries in low-tax cantons can still leave a U.S. bill after both, because the U.S. rates are higher than the Swiss ones.
We run your returns both ways before choosing. How we compare the exclusion and the credit.
A worked example: a finance manager in Zug
Sarah is a U.S. citizen working in Zug on CHF 180,000 a year, renting an apartment and paying into her employer’s pension fund and a Pillar 3a in funds. Her Swiss bank has asked her to prove she’s compliant.
| Item | How it’s handled |
|---|---|
| Salary | Zug’s tax is well below the U.S. tax on it. The exclusion and housing exclusion cover the first part, the credit covers what Swiss tax it can, and a modest U.S. bill can remain. |
| Pension fund | On the FBAR. Her employer’s contributions and the growth could be taxable for the U.S., depending on the plan, so we check it before filing. |
| Pillar 3a in funds | The funds are usually PFICs, with a Form 8621 each, and the growth could be taxable as it builds. |
| Her bank | Once her catch-up package is filed, we provide what the bank usually asks for to show her U.S. filings are in order. |
| Catching up | Three years of returns and six FBARs under the Streamlined procedures, with no penalty if she qualifies. |
Catching up from Switzerland
Most Americans in Switzerland who fell behind without meaning to can catch up under the Streamlined Foreign Offshore Procedures: three years of returns, six years of FBARs and, if you qualify, no penalties. If only FBARs are missing, or you’ve moved back to the U.S., another route may fit better. See every IRS catch-up option for expats, compared.
Common questions
My Swiss bank says I must prove I’m compliant. Can you help?
Yes. Once your catch-up package is filed, we can provide what banks usually ask for to show your U.S. filings are in order.
Should I keep my Pillar 3a?
Often the Swiss tax savings outweigh the U.S. cost, but not always. We’ll show you both sides before you decide.
Is my Pillar 2 pension taxed by the U.S.?
Possibly, while it builds. The treaty doesn’t shelter it for U.S. citizens living in Switzerland, so employer contributions and growth could be taxable for the U.S., depending on the plan. The rules aren’t settled, and we explain the options before filing.
Does Swiss wealth tax reduce my U.S. tax?
No. It’s a tax on assets, not income, so it doesn’t count toward the foreign tax credit.
Do I pay U.S. Social Security tax in Switzerland?
Generally not if you pay into the Swiss AHV/AVS system. The U.S.-Switzerland totalization agreement prevents paying into both systems for the same work in most cases.
I'm taxed at source on a B permit. Do I still file in the U.S.?
Yes. Swiss tax at source doesn’t change your U.S. filing. Your Lohnausweis shows the Swiss tax withheld, which counts toward the foreign tax credit.
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