Swiss Marriage, Divorce & Prenups: What Expats Need to Know

• Register your foreign marriage at the Swiss Zivilstandsamt when you arrive — usually alongside Anmeldung.
• Swiss default = Errungenschaftsbeteiligung (participation in acquired property). Salary-built assets are shared; pre-marriage assets, gifts and inheritances stay separate.
• A prenup (Ehevertrag) must be signed before a Swiss notary to be valid. Sample cost CHF 500–2,000.
• The 2nd pillar pension earned during the marriage is split 50/50 — mandatory.
• Swiss divorce is no-fault. Joint agreement + notarised settlement = fast track. Contested = slow and expensive.
• Cross-border couples can pick their governing law via a choice-of-law clause — a very powerful clause most expats miss.

Swiss marriages are civil first, religious optional. Every marriage — foreign or domestic — needs to sit in the federal civil registry to be recognised for taxes, permits, inheritance and pensions.

1. Marrying in Switzerland: file a preparatory procedure (Vorbereitungsverfahren) at your Zivilstandsamt. Documents needed: passports, birth certificates, proof of address, certificates of civil status (Ledigkeitsbescheinigung), and — for non-Swiss — evidence of legal residence. Foreign docs must be apostilled and translated. Cost around CHF 300–500.
2. Ceremony: any Zivilstandsamt in Switzerland, weekdays and Saturday mornings. Two adult witnesses. Held in one of the official cantonal languages.
3. Foreign marriage abroad: register with the Swiss commune where you first live. Bring original certificate + apostille + certified translation into German/French/Italian. The Zivilstandsamt forwards it to the federal Infostar database.
4. Name choice: since 2013 both spouses keep their birth surnames by default. You can jointly declare one spouse's name as the family name.

New to the paperwork side of Switzerland? Start with how to register after you arrive.

Swiss law offers three regimes. One applies automatically, the other two require a notarised Ehevertrag.

Under the default regime, careful documentation of Eigengut matters enormously. If you brought CHF 200,000 of savings into marriage and can't prove it 15 years later, courts often treat it as Errungenschaft and split it. Keep dated statements.

An Ehevertrag is a notarised contract that changes your default regime. It can be signed before marriage or at any point during it. To be valid it must be:

• Written by a Swiss notary (each canton regulates notaries differently — some are private lawyer-notaries, others are cantonal officials).
• Signed in the notary's presence by both spouses.
• Filed / recorded — the notary handles this.

Typical clauses:

• Regime choice: usually Gütertrennung for dual-career couples with separate finances.
• Choice of law: for international couples, this may be the most valuable clause of all — see next section.
• Adjustments to the death share (Vorschlagszuweisung): the surviving spouse can be given more or less than the statutory half of Errungenschaft.
• Explicit list of Eigengut with values — future-proofing.

What an Ehevertrag cannot do: it cannot waive the 50/50 split of Pillar 2 accumulated during marriage, cannot cut protected inheritance shares (Pflichtteil) below statutory minima, and cannot pre-fix child maintenance.

Cost benchmark: a straightforward Gütertrennung Ehevertrag runs CHF 500–1,500 in most cantons. Add CHF 500–1,500 for a choice-of-law clause and a proper Eigengut inventory. Cheap insurance against a five-figure divorce fight.

Under the Swiss Federal Act on Private International Law (IPRG / LDIP), spouses can elect the law that governs their matrimonial property regime. The choices are:

• The law of the country where at least one spouse is a citizen, or
• The law of the country where they live.

Without an election, the default rule is: the law of the common domicile — i.e., once you both live in Switzerland, Swiss law takes over prospectively.

This matters when, for example, a British couple lived under English common-law rules (no communal regime) and moves to Switzerland: after establishing common Swiss residence, new Swiss Errungenschaft quietly begins accruing. A single-page choice-of-law clause in an Ehevertrag keeps your assets under the law you actually married under. This is one of the highest-leverage documents an expat couple can sign.

Swiss divorce is no-fault. Adultery, unreasonable behaviour and the like are not grounds and rarely relevant. Two paths:

Every divorce settlement must be approved by a court. Judges routinely check that the deal is not manifestly unfair — especially on maintenance and pensions — and can send couples back to renegotiate.

• Errungenschaft: 50/50, unless prenup says otherwise. Includes salary, savings, joint investments, home appreciation funded during marriage.
• Eigengut: stays with its owner. Proof matters.
• Pillar 1 (AHV): individual contributions during the marriage are pooled and equally split when calculating each spouse's future AHV pension (Splitting). Automatic.
• Pillar 2 (BVG): 50/50 split of the pot accumulated during the marriage — statutory, near-untouchable.
• Pillar 3a: forms part of matrimonial property unless it comes from Eigengut. Usually split 50/50 under the default regime.
• Maintenance (Alimente): modest by international standards. Courts expect financial self-sufficiency after divorce; longer marriages with children see longer support.
• Family home: whoever has primary custody usually gets to stay; the other spouse retains their share of the value.

Model your pension picture with our 3-pillar guide and see the pension-split trap in the pension mistake most people make.

Swiss family law strongly favours joint parental authority (gemeinsame elterliche Sorge), held by both parents after divorce as a rule. Custody arrangements (Obhut) are separate: physical care can be shared or assigned mainly to one parent, but legal decision-making remains joint unless the court says otherwise.

• Moving abroad with a child requires the other parent's consent or court approval — Hague Convention rules apply.
• Child maintenance is set by cantonal guidelines and family income. Both parents contribute pro-rata.
• Mediation is encouraged; some cantons make it near-mandatory before contested court steps.

• Tax filing: married couples file jointly in Switzerland — the so-called Ehepaarbesteuerung, often a small penalty at higher incomes. Divorce switches you back to single filing effective for the entire tax year.
• Quellensteuer: at-source tax rates for married couples differ from single rates; notify your employer within a month of divorce.
• Permits: a permit obtained via family reunification (marriage) can be re-examined on divorce. B permits generally survive if the marriage lasted ≥ 3 years and integration is sufficient (Art. 50 FNIA). See family reunification rules.
• Property: title deeds must be updated after a settlement — the notary handles this against the divorce decree.

• Never registering the foreign marriage — everything downstream (taxes, permits, pensions) breaks.
• Assuming a foreign prenup carries over unchanged — it may, partially, but Swiss courts apply Swiss mandatory rules on Pillar 2 and Pflichtteil regardless.
• No written Eigengut inventory. Fifteen years later, no one remembers what CHF sat where.
• Verbal agreements on money. Nothing binds until it's notarised.
• Rushing a joint divorce petition without a proper pension and property valuation. Cheap now, expensive later.
• Ignoring the choice-of-law clause — the most under-used tool in expat marriages.

1. Register your foreign marriage at the Zivilstandsamt on arrival.
2. List Eigengut assets in writing, with dated statements — keep it safe.
3. Discuss the three regimes; decide whether an Ehevertrag makes sense.
4. If international, add a choice-of-law clause to the Ehevertrag.
5. Book a notary; budget CHF 500–2,000.
6. Keep annual snapshots of pension statements (AHV IK-Auszug + Pillar 2 certificate).
7. If separating, get one legal consultation before signing anything — most cantons offer 30-minute Rechtsauskunft for CHF 40–80.