Most Americans in Switzerland assume Swiss tax is high enough to wipe out anything the IRS wants. In Geneva that’s usually right. In Zug it often isn’t, because Swiss income tax is set largely by your canton and commune, and a salary taxed at over 40% at the margin in Geneva is taxed at roughly half that in Zug.
The other thing that decides your US return is Swiss savings. Pillar 2, pillar 3a and Swiss funds are all tax-favoured in Switzerland, and the US treats each of them differently.
Do I still have to file a US return from Switzerland?
Yes, every year your gross worldwide income passes the filing threshold. For 2025 that’s $15,750 if you’re single and under 65, $400 of net self-employment income, and just $5 if you’re married to a non-American and file separately, which is how most mixed couples in Switzerland file. Swiss couples are assessed jointly by the canton, but that doesn’t carry over: filing jointly in the US means electing to put your spouse’s worldwide income on the 1040, and we only do that when the numbers say so.
Both countries tax the calendar year, so your Lohnausweis (the annual salary certificate) lines up with the US return. The deadlines for 2025 are:
- 31 March 2026: the usual cantonal deadline, including Zurich and Geneva. Vaud and some others use 15 March. Every canton grants extensions, though some charge for the longer ones.
- 15 April 2026: any US tax owed is due. Interest runs from here even if you file later.
- 15 June 2026: the automatic filing deadline for Americans living and working abroad.
- 15 October 2026: the extended US deadline if you file Form 4868 by 15 June. The FBAR is extended to the same date automatically.
Swiss assessments often arrive long after June. We file on the tax withheld or estimated and amend if the final cantonal assessment is materially different.
Why your canton decides between the FEIE and the foreign tax credit
Swiss income tax comes in three layers: direct federal tax, capped at 11.5% for individuals, plus cantonal and communal tax, each set as a multiple of a base tariff. The combined top rate is roughly 22% in the town of Zug and around 43% in Geneva, according to KPMG’s annual survey. Your commune and your church registration both move the number.
Where Swiss tax is higher than US tax on the same income, the foreign tax credit (Form 1116) takes US tax on your salary to zero and banks the excess for up to ten years. That’s our default for most people in Geneva, Vaud, Basel and Bern.
Where Swiss tax is lower, the credit leaves a US balance, and the foreign earned income exclusion (Form 2555) earns its place. It takes the first $130,000 of 2025 earnings off the US return, and the housing exclusion adds rent and utilities above $20,800 up to a city limit. IRS Notice 2025-16 sets that limit at $102,600 in Geneva and $72,100 in Bern. Zurich’s is only $39,219, barely above the $39,000 that applies anywhere not listed, which includes Zug, Basel and Lausanne. You can exclude up to the limit and still claim the credit on whatever income is left.
Two Swiss levies don’t count toward the credit. Wealth tax is a tax on assets, not income, and AHV and other social contributions are dealt with by the totalization agreement instead. Church tax is calculated on income, and we generally treat it as creditable.
Example: Daniel, single, on CHF 200,000 in Zug
Say Daniel earns CHF 200,000 in 2025, about $240,700 at the IRS average rate, and rents a flat for CHF 4,000 a month (about $57,800 a year). Assume his Swiss income tax comes to about CHF 25,000 (≈ $30,100), which is in the right range for a single person on this salary in Zug, though his own deductions will move it.
Credit only: US tax on his salary after the standard deduction is about $49,000. His Swiss tax covers $30,100 of it, leaving roughly $19,000 to pay the IRS.
Exclusion plus credit: he excludes $130,000 of salary and $18,200 of housing (Zug isn’t on the IRS list, so the default $39,000 limit applies). The remaining $92,500 is taxed at the rates it would have faced on top of the excluded income, about $20,600, and the share of his Swiss tax that relates to it, about $11,600, is credited. He owes roughly $9,000.
That’s about $10,000 a year in his favour. The catch is that once you revoke the exclusion you generally can’t go back to it for five years, so we’d look at where Daniel expects to be before electing it.
Illustrative figures, rounded. His Swiss tax is an assumption, not a calculation from the Zug tariff.
I’m on a B permit and taxed at source. What changes?
Foreign employees on a B permit usually pay Quellensteuer: tax withheld from each payslip at a rate set by the canton, with no annual return. C-permit holders, and anyone married to a Swiss citizen or C-permit holder, are assessed the ordinary way instead.
Earn CHF 120,000 or more in gross salary and the canton puts you into a mandatory nachträgliche ordentliche Veranlagung (NOV): a full return after the year ends, with your source tax credited against the result. Below that you can ask for one, but the request has to reach the canton by 31 March of the following year and that deadline isn’t extended. Once you’re in, you stay in until you leave source taxation. People ask for the NOV to claim pillar 3a, commuting and childcare deductions, and they’re sometimes surprised that it also brings in wealth tax and a full list of their assets.
For the US return, what matters is the final Swiss tax. Source tax is creditable in the year it’s withheld, and if the NOV later changes it, we adjust the credit.
Example: Sarah, a B-permit engineer in Geneva on CHF 130,000
Take Sarah, single, earning CHF 130,000 in 2025, about $156,400. Her employer withholds source tax, and because she’s over CHF 120,000 Geneva assesses her through the NOV. Assume her final Swiss income tax is about CHF 26,000 (≈ $31,300).
Her US tax before credits, after the $15,750 standard deduction, is about $26,600. The foreign tax credit wipes it out, so she owes $0, and roughly $4,700 of unused Swiss tax carries forward to a future bonus year.
Her CHF 7,258 pillar 3a contribution cuts her Geneva tax. It does nothing on the US side: the full salary stays in her US income, and the account goes on her FBAR.
The exclusion would also get her to zero, since her rent is well under the Geneva limit of $102,600. We’d still pick the credit here because it builds a carryforward and keeps IRA contributions open.
Illustrative figures, rounded. Her Swiss tax is an assumption; the real one comes from her Geneva assessment.
How the US treats pillar 1, pillar 2 and pillar 3a
The US–Swiss treaty of 1996 has an article on pension contributions, Article 28(4), but the saving clause lets only people who are neither US citizens nor green-card holders use it against the US. So an American in Switzerland gets no US deduction for Swiss pension contributions, whatever the Swiss side allows.
| Swiss pillar | In Switzerland | On your US return (how we handle it) |
|---|---|---|
| Pillar 1: AHV/AVS | Payroll contributions of 10.6%, split with the employer, plus 2.2% unemployment insurance | No US deduction or credit. The totalization agreement stops double contributions. A Swiss state pension paid to you in Switzerland is US-taxable, with credit for Swiss tax |
| Pillar 2: BVG/LPP pension fund | Contributions and buy-ins deductible; capital withdrawals taxed separately at a reduced rate | Your contributions aren’t deductible and become after-tax basis. Lump sums (retirement, home purchase, leaving Switzerland) are taxable as ordinary income, with credit for the Swiss withdrawal tax. On Form 8938 above the threshold |
| Pillar 3a | Contributions deductible up to CHF 7,258 for 2025 (CHF 36,288 without a pension fund) | Not deductible. We treat growth as taxable as it’s earned. Reported on the FBAR and Form 8938 |
Pillar 3a is the unsettled part
There’s no IRS guidance on 3a and the treaty doesn’t cover it, so practitioners split. Some treat it as a foreign pension and defer the growth; others treat a bank 3a as a taxable savings account and a securities 3a as a foreign trust holding PFICs. We lean toward treating 3a as taxable each year, because nothing in the law supports deferral for a US citizen. Rev. Proc. 2020-17 generally lifts the Form 3520 trust filings for accounts like 3a, but not the income tax. In practice that makes a plain bank 3a (a Konto, earning interest) the easy one to report, and a fund-based 3a with a Swiss bank or app provider the expensive one. If you haven’t opened a 3a yet, talk to us first.
For AHV itself, the US–Swiss totalization agreement (in force since 1 November 1980) assigns you to one system. Work for a Swiss employer and you pay AHV only. If a US employer sends you for five years or less, you can stay in US Social Security with a certificate of coverage. Self-employed people living in Switzerland pay into AHV and are exempt from US self-employment tax; the Swiss certificate (form CH/USA 10, from your Ausgleichskasse) goes with the US return.
Swiss funds, the 35% withholding tax and PFICs
Swiss investment funds and ETFs, including the ones your bank will steer you toward for a 3a or a savings plan, are almost always PFICs for US tax. Each needs Form 8621, and without an election a sale is taxed at the top US rate for every year you held it, plus interest. Individual shares in Swiss companies aren’t PFICs and are far simpler.
Swiss companies withhold 35% Verrechnungssteuer on dividends. As a Swiss resident you get all of it back by listing the holding in the securities schedule (Wertschriftenverzeichnis) of your cantonal return. Because it’s refundable, it isn’t creditable on the 1040. The dividend is still US income, and the credit comes from the ordinary Swiss income tax on it, in the passive category, which can’t shelter your salary.
Owning a Swiss home: Eigenmietwert, mortgages and selling
Switzerland taxes homeowners on the Eigenmietwert, a notional rent for living in your own home. The US doesn’t, so it never goes on your 1040. Voters approved abolishing it on 28 September 2025, and the Federal Council has set the change for 1 January 2029, when most mortgage-interest deductions on your own home go with it.
A franc mortgage creates a quiet US issue. If the franc falls against the dollar before you repay, the US sees a taxable exchange gain on the loan, even though you repaid exactly what you borrowed; a loss isn’t deductible. When you sell, the cantonal real-estate gains tax (Grundstückgewinnsteuer) is creditable, and the US home-sale exclusion covers up to $250,000 of gain ($500,000 jointly), measured in dollars.
Swiss banks, FATCA and reporting your accounts
After the UBS case in 2009 and the US Justice Department’s programme for Swiss banks from 2013, many banks decided Americans were more trouble than they were worth. Today most will open an account if you sign a W-9, but some still turn US persons away and many limit what you can invest in. If that happens, PostFinance and the cantonal banks are the usual places to try next.
Swiss banks currently report US accounts under a Model 2 FATCA agreement, which runs through the banks themselves. A Model 1 agreement with automatic government-to-government exchange was signed on 27 June 2024; Switzerland’s State Secretariat for International Finance gives 1 January 2029 as the earliest date it takes effect. Either way, assume the IRS knows your balances.
File an FBAR if your non-US accounts together topped $10,000 at any point in 2025, counting 3a and vested-benefits (Freizügigkeit) accounts. Form 8938 goes with your return once foreign assets exceed $200,000 at year end or $300,000 at any time ($400,000 / $600,000 married filing jointly). For income we convert at the IRS 2025 average of CHF 0.831 per $1 (about $1.20 per franc); FBAR balances use the Treasury rate for 31 December. Our FBAR guide goes through the details, or we can file it for you.
Dual Swiss–US citizen and never filed?
Citizenship, not residence, creates the obligation, so Swiss citizens born in the US are expected to file. Many find out when their bank asks for a W-9. If it wasn’t wilful, the Streamlined Foreign Offshore Procedures let you catch up with three years of returns and six years of FBARs, with no penalty; most people in Switzerland owe little or nothing once credits are applied. See our Streamlined guide. If you kept a home or other ties in a US state, read our state tax guide too, because some states keep treating you as a resident.
What we’d do for you
We start with your canton, your permit and your salary certificate, run the credit and the exclusion side by side, and decide how to report your pillar 2, 3a and any Swiss funds before anything is filed. Then we file the 1040, the FBAR and Form 8938 together so they tell the same story. See pricing or how expat filing works.