Switzerland has permitted dual (and multiple) citizenship since 1992. If you naturalise as a Swiss citizen today, Switzerland will not ask you to renounce your existing nationality. But Switzerland’s position is only half the equation. Your home country may take a very different view — and if you do not check before applying, you risk losing one passport while gaining another.
This guide explains how Swiss dual citizenship works, the exceptions that still apply, the countries that create problems, and a real case where getting the sequence wrong nearly cost someone both citizenships.
The 1992 Change and What It Means Today
Before 1992, Swiss law operated on the principle of single nationality. A Swiss national who voluntarily acquired a foreign citizenship generally lost their Swiss passport. A foreign national naturalising as Swiss had to renounce their existing nationality.
This changed with the amendment of 1 January 1992, reflected in the current Federal Act on Swiss Citizenship (BüG). Since then:
- Swiss nationals can acquire foreign citizenship without losing their Swiss passport
- Foreign nationals naturalising as Swiss do not need to renounce their prior citizenship
- Individuals can hold Swiss citizenship alongside any number of other nationalities
What This Means for Naturalisation Applicants
If you are going through Swiss ordinary naturalisation or facilitated naturalisation, you will not be asked to give up your existing passport. Swiss authorities do not require proof of renunciation and do not inform your home country of your Swiss naturalisation.
The Other Side: Your Home Country’s Rules
Switzerland takes no position on whether other countries permit dual nationality. That is a matter for each country’s own laws. And this is where the friction lies.
Some countries — including Germany (with restrictions), Japan, China, India, and Singapore — limit or prohibit dual citizenship. If your home country requires renunciation upon acquiring Swiss citizenship, that obligation comes from your home country, not from Switzerland.
The critical point: check your home country’s rules before applying for Swiss citizenship. Discovering that you have automatically lost your original nationality after the fact is an irreversible problem.
Country-by-Country Dual Citizenship Compatibility
| Country | Permits Dual Citizenship with Switzerland? | Notes |
|---|---|---|
| United States | Yes | US taxes citizens globally regardless of residence |
| United Kingdom | Yes | No restrictions |
| France | Yes | No restrictions |
| Germany | Restricted | Voluntary acquisition of Swiss citizenship may require prior Beibehaltungsgenehmigung |
| Italy | Yes | No restrictions |
| India | No | Must renounce Indian citizenship |
| China | No | Must renounce Chinese citizenship |
| Japan | Restricted | Expected to choose one by age 22 |
| Brazil | Yes | No restrictions |
| Australia | Yes | No restrictions |
| Canada | Yes | No restrictions |
| Saudi Arabia | No | Automatic loss of Saudi citizenship |
| UAE | No | Automatic loss of Emirati citizenship |
| Singapore | No | Must renounce Singaporean citizenship |
This table provides general guidance. Laws change. Verify the current position with a legal adviser before applying.
Case Study: The German Executive Who Almost Lost Both Passports
A German executive working in Zurich for nine years applied for Swiss ordinary naturalisation. He had a C permit, spoke fluent Swiss German, and his commune approved the application without difficulty.
He did not check Germany’s dual citizenship rules before applying. Germany restricts dual citizenship: a German citizen who voluntarily acquires a non-EU nationality may automatically lose German citizenship unless they obtain prior permission (a Beibehaltungsgenehmigung) from the German authorities.
Switzerland and the EU have bilateral agreements, but Switzerland is not an EU member state. German law does not automatically treat Swiss nationality the same as EU nationality for dual citizenship purposes.
What happened: His Swiss naturalisation was approved and registered. Three months later, he discovered that under German law, he may have automatically lost his German citizenship at the moment the Swiss naturalisation took effect. He had not applied for a Beibehaltungsgenehmigung.
The resolution: He engaged German nationality counsel to argue for retention. The outcome was uncertain for months. He was eventually able to retain both citizenships, but the process cost over EUR 8’000 in legal fees and caused significant personal stress.
The lesson: For German nationals, the Beibehaltungsgenehmigung must be obtained before the Swiss naturalisation is finalised. The sequence matters. Doing it the other way round creates a gap where German citizenship may be lost. This applies to citizens of any country with dual citizenship restrictions — not just Germany.
Practical Friction Points for Dual Citizens
Which passport to use: Switzerland does not formally require Swiss nationals to use their Swiss passport to enter, but you should identify as Swiss when dealing with Swiss authorities. When travelling internationally, use whichever passport is most convenient.
Military service: Switzerland has mandatory military service for Swiss male citizens. Dual citizens living in Switzerland are subject to this obligation. Some countries impose their own military service obligations regardless of other citizenships held.
Consular protection: Switzerland can only provide consular protection in third countries — it cannot protect you in the country of your other nationality, as that country views you as its own national.
Tax: Swiss citizenship does not itself create Swiss tax residency. Tax residency is determined by where you live. If you hold Swiss citizenship but live abroad, you are not subject to Swiss income tax (unlike the US, which taxes citizens globally). Switzerland has over 100 double tax treaties. In practice, dual citizens running a Swiss company from abroad face three recurring issues: (1) determining where “effective management” sits for treaty purposes, (2) avoiding permanent establishment risk in the residence country, and (3) structuring director fees and dividends to minimise double taxation. See our guide on double tax treaties.
Banking: Swiss banks scrutinise the nationality and tax residence of ultimate beneficial owners (UBOs). US persons face near-automatic rejection from most Swiss banks due to FATCA reporting obligations — a constraint driven by banking policy, not corporate law.
Children of Dual Citizens
A child born to a Swiss parent acquires Swiss citizenship automatically at birth, regardless of where the child is born or what citizenship the other parent holds. Swiss citizenship acquired by descent must be registered at the Swiss consulate for children born abroad. For births abroad after 1 June 1985, the age-25 registration deadline under Art. 7a BüG applies — see Swiss citizenship by descent.
Reclaiming Swiss Citizenship
If you or an ancestor previously held Swiss citizenship that was lost, reinstatement (Wiedereinbürgerung) under Art. 51 BüG may be available. This is a substantially simpler and faster procedure than ordinary naturalisation for qualifying applicants.
Frequently Asked Questions
Does Switzerland notify my home country when I naturalise Swiss?
No. Swiss authorities do not inform foreign governments. Whether your home country discovers your Swiss naturalisation depends entirely on that country’s own rules and practices.
I’m German — will I lose my German citizenship if I naturalise Swiss?
Potentially. Germany restricts dual citizenship for non-EU nationalities. You must apply for a Beibehaltungsgenehmigung from the German authorities before your Swiss naturalisation is finalised. Getting the sequence wrong can result in automatic loss of German citizenship.
Can I use my foreign passport to live in Switzerland if I am also Swiss?
Once you are Swiss, Swiss law considers you Swiss inside Switzerland. Your foreign passport does not give you different rights. Use Swiss documents for Swiss administrative purposes.
Can a Swiss company owner hold dual citizenship?
Yes. Dual citizenship has no bearing on your ability to own and operate a Swiss company. You can form a company regardless of how many citizenships you hold.
Does dual citizenship affect Swiss military service obligations?
Dual citizens living in Switzerland are subject to Swiss military service obligations. Dual citizens living abroad are generally exempt. Check your home country’s position on military service.
Can I lose my Swiss citizenship if I acquire another nationality?
No, not since 1992. The 1992 amendment applies going forward and is not retroactive.
Which countries do not allow dual citizenship with Switzerland?
India, China, Japan, Singapore, and many Gulf states do not permit dual citizenship. Germany has restrictions with exceptions. If your home country prohibits dual nationality, acquiring Swiss citizenship results in loss of your original nationality under your home country’s laws.
Do Swiss dual citizens pay tax in both countries?
Swiss citizenship does not create Swiss tax residency. If you live abroad, you are not subject to Swiss income tax. The US is the exception — it taxes citizens globally. Switzerland has extensive double tax treaties to mitigate double taxation.
Can I reclaim Swiss citizenship I lost before 1992?
You may be eligible for reintegration under Art. 51 BüG. This is a facilitated procedure, substantially faster than ordinary naturalisation.
Lawsupport (Morgan Hartley Consulting) Grafenauweg 4, Zug, Switzerland +41 44 51 52 592 [email protected]