A couple without a marriage contract still has a property regime — it was simply chosen for them by conflict-of-laws rules rather than by the spouses. For a family that spends its whole life in one country this is tolerable: the rules are familiar and predictable. For an international couple it is not: a relocation, a second passport or a house bought abroad can silently switch the applicable law. A marriage contract returns control — provided it is drafted with an eye on every country where the family lives, holds assets or could plausibly litigate.
Why an International Couple Needs One
The main trap sits in the default rules. In the EU the matrimonial property regime is governed by Regulation 2016/1103: absent a choice of law, the regime of the first common habitual residence after the wedding applies. A couple that started married life in Russia and divorces in Germany ten years later may discover that a German court divides their assets under Russian community-property rules — a surprise for both sides. Outside the EU the logic differs but is no softer: English and US courts apply their own law (lex fori), and a Russian court applies the Family Code wherever the marriage was concluded. The more mobile the family, the less sense it makes to rely on a default regime — at any moment it can turn out to be someone else's.
Three Worlds: Notarial Contract, Prenup, Russian Family Code
Continental Europe treats marriage contracts calmly and respectfully. The German Ehevertrag, the French contrat de mariage, the Spanish capitulaciones matrimoniales and the Swiss marital agreement are notarial documents that courts enforce almost without reservation; entrepreneurs routinely use them to elect separation of property (séparation de biens). The one visible filter is the German Inhaltskontrolle: a court reviews the contract for fairness and will not let the economically stronger side contract everything away.
England is a different world. Formally a prenup does not bind the court: the last word always belongs to the judge under s. 25 of the Matrimonial Causes Act 1973. But since Radmacher v Granatino (2010) a prenup is effectively upheld when it was signed freely, well in advance, with full disclosure of assets, and does not leave a spouse or children in need. In the US a prenup is a standard instrument under the UPAA/UPMAA: it works where there is voluntariness, disclosure and no unconscionability, with the details varying by state.
Russia sits in between. A marriage contract under Arts. 40–44 of the Family Code is notarial and can reshape the property regime freely, but it covers property matters only. A court may strike down terms that put a spouse in an "extremely unfavourable position" (Art. 44) — and Russian courts apply that proviso noticeably more often than German courts apply their Inhaltskontrolle, so heavily one-sided Russian contracts live in the risk zone.
What You Can Write In — and What Will Not Work
The subject matter is property: the regime (community, separation, shares — for everything or for specific assets), the fate of particular objects, business stakes, compensation mechanics. Many jurisdictions also allow spousal maintenance to be regulated — but this is exactly where the borders run: an English court will not allow a contract to leave a party in need, German practice protects the spouse raising children, and a Russian contract cannot regulate personal non-property matters at all. Questions about children — custody, residence, contact — cannot be locked in by contract anywhere: courts decide them by the child's interests at the moment of the dispute, not by a text signed before the child was born.
Choice of Law: Regulation 2016/1103 and Rome III
The strong move for a mobile couple is to choose the applicable law explicitly. EU Regulation 2016/1103 lets spouses subject their property regime in advance to the law of the citizenship or habitual residence of either of them — and that choice survives relocations. The separate Rome III Regulation (1259/2010) additionally allows, in participating states (Germany, France, Spain, Portugal and others), a choice of the law applicable to the divorce itself. A properly assembled package for a "Russia + EU" couple usually carries both layers: a choice of law for the property regime and an agreed divorce scenario — where to file and under which rules to divide (how the competent court is determined, and when a divorce is recognised abroad, is set out in cross-border divorce jurisdiction).
Recognition Abroad and Mirror Agreements
A contract that is perfect in one country can turn out to be paper in another. An English court will weigh a German notarial Ehevertrag merely as a "factor" in the Radmacher sense; a Russian contract in France will meet questions of form and public policy; an English prenup in Moscow — the Art. 44 caveat. The practice for families with assets in several countries is mirror agreements: coordinated texts, each enforceable under the rules of its own jurisdiction, plus legal opinions from local counsel confirming validity. It costs more than a single document — and incomparably less than a cross-border dispute about whether the contract works at all.
When to Sign: Prenup vs Postnup
A contract can be signed both before and during the marriage — and this is not a technicality. In Russia and most of continental Europe a postnup is fully legal and works exactly like a prenup. In England a postnup is historically even stronger: it is free of the reproach of being "signed under pressure on the eve of the wedding". In the US some states treat postnups more strictly than prenups. The universal timing rules: do not sign a week before the wedding, give each side independent counsel and time to reflect, and fix full asset disclosure as an annex to the contract — these three points close 90% of future challenge grounds.
Practice
The working product for an international couple is not a "notary template" but a small project: an asset-and-jurisdiction map, a 2016/1103 choice of law, a principal contract in the anchor jurisdiction, mirror texts where the key assets sit, and a disclosure protocol. It should be revisited at every big turn — relocation, sale of a business, birth of children: a contract signed in one life must keep working in the next one. Where the marriage contract sits against the rest of the family perimeter — the property regime, succession and divorce — is laid out in the family cluster map.
Fourteen Jurisdictions Side by Side
The three worlds above become practical only when the requirements are read country by country. The set is the one used across the family and succession pages: the twelve jurisdictions of the pairwise prenup navigator plus Italy and China — the same fourteen that run through the succession map, the matrimonial regimes matrix and the divorce forum matrix. The first table covers the mechanics of signing: how the contract must be made, how much force it has once made, what the court can still do to it, and whether anyone outside the couple gets to see it.
| Jurisdiction | Form | Binding force | Fairness filter | Publicity |
|---|---|---|---|---|
| Russia | Notarial only; before the wedding (effective from registration) or at any time during the marriage | Binds the court on property | Terms leaving a spouse in an extremely unfavourable position are struck down (Arts. 42(3), 44(2) Family Code) | No register; creditors must be notified of the contract (Art. 46) |
| Kazakhstan | Written and notarised (art. 40(2) Marriage and Family Code); from the filing of the marriage application or at any time during the marriage — a model close to the Russian one | Binds the court on property | The same “extremely unfavourable” proviso | No register |
| Germany | Notarial deed with both parties present simultaneously; before or during the marriage | Strong — courts enforce it as written | Inhaltskontrolle: a tilt against the child-raising spouse will not stand | Entry in the Güterrechtsregister is optional and matters for third parties |
| Switzerland | Notarial deed (öffentliche Beurkundung); before or during the marriage | Strong, within the statutory menu | The statute sets the frame — freeform constructions fail | No public register |
| France | Contrat de mariage before a notary pre-wedding; a mid-marriage change also runs through a notary with no waiting period (Art. 1397 Civil Code as amended in 2019) | Strong | Adult children and creditors are notified of a change; the court steps in only on objection | Mentioned in the civil-status records |
| Spain | Escritura pública before a notary; before or after the wedding | Strong | Regional systems override: Catalonia and the Balearics run their own rules | Registered in the civil registry |
| Portugal | Premarital convention before a civil-registry official or by public deed (Art. 1710); under Portuguese law, separation is mandatory if either spouse is at least 60 at marriage (Art. 1720) | Within legal limits, including permitted tailored regimes | Statutory regimes or a tailored regime within legal limits (Art. 1698) | Registered in the civil registry |
| Italy | Atto pubblico before a notary on pain of nullity; separation of property can also be declared in the marriage act; any time before or during the marriage (art. 162 Civil Code) | Regime rules are separate; Cass. 20415/2025 upheld a specific reciprocal economic settlement conditional on separation, not every future-divorce clause | A waiver of the assegno divorzile stays void | Annotated in the margin of the marriage record — otherwise not opposable to third parties |
| Cyprus | Marriage-related contracts other than dowry-type promises require writing and at least two attesting witnesses (s. 77(2)), subject to statutory exceptions | Depends on the clause and applicable law; form alone does not settle enforceability | Section 26A concerns dowry-type property promises, not a blanket prohibition of every future-divorce clause | — |
| England and Wales | A written deed signed well in advance; the “28 days, independent advice, full disclosure” set is best practice from the Law Commission’s 2014 proposals, never enacted | Not binding — weight under Radmacher | Needs override the contract and the court keeps the last word (s. 25 MCA 1973) | None |
| United States | Written and signed; the UPAA/UPMAA are adopted by most but not all states (New York, Massachusetts and Ohio follow their own law) | Enforceable as a contract | Voluntariness, full disclosure and time to reflect are required almost everywhere; unconscionability defeats it | None |
| Israel | Written; before marriage, authentication by an authorised notary or marriage registrar, or court approval; during marriage, approval by a competent family or religious court. Religious-court procedure depends on jurisdiction over the couple. | Strong once approved | The approval itself is the filter | Through the approving body |
| UAE | For non-Muslims the agreement attaches to the marriage registration (Art. 6 of Federal Decree-Law 41/2022; in Abu Dhabi, Emirate Law 14/2021); for Muslims the personal-status framework and mahr apply | Recognised under the civil regime | Maintenance arrangements remain subject to court control | Filed with the marriage registration |
| China | Written agreement; notarisation is common practice, not a condition (art. 1065 Civil Code) | Binds the spouses | General contract defences — fraud, coercion | No register; a creditor is bound only if it knew of the agreement |
The second table answers what may actually go into the document, and whether the couple can pick the law that will read it.
| Jurisdiction | Subject matter | Maintenance | Children | Postnup | Choice of law |
|---|---|---|---|---|---|
| Russia | Property only: the regime, specific assets, stakes, compensation | Spousal support may be provided for; personal relations may not | Outside the contract | Equally valid | Art. 161 Family Code — available to spouses without common citizenship or residence |
| Kazakhstan | Property matters (Arts. 39–43 Marriage and Family Code) | Provided for | Terms on the property rights of children born or adopted in the marriage are allowed (Art. 39(2)) — unlike Russia; custody is not | Equally valid | Art. 275: common residence, then last common residence; if there was never a common residence, Kazakh law applies on Kazakh territory. The article has no express choice clause; foreign-contract form and effect require separate analysis. |
| Germany | The regime, the Versorgungsausgleich and maintenance | Waivable, but the court checks the trade-off | Outside the contract | Equally valid | Regulation 2016/1103, plus Rome III for the divorce itself |
| Switzerland | Election among the statutory regimes and adjustment of the accrual shares | Limited | Outside the contract | Equally valid | Under the PILA; 2016/1103 does not apply |
| France | Regime election (séparation de biens, communauté universelle) and clause tailoring | Maintenance and the prestation compensatoire are only weakly contractable | Outside the contract | A mid-marriage change, on notice to adult children and creditors | 2016/1103 and Rome III |
| Spain | Election and tailoring of the regime, compensation clauses | Partly | Outside the contract | Equally valid | 2016/1103 and Rome III |
| Portugal | Statutory regimes — community of acquisitions, full community, separation — or a tailored regime within legal limits | Limited | Outside the contract | The convention precedes marriage; subsequent regime changes are restricted to statutory exceptions, including judicial separation (Arts. 1714–1715) | 2016/1103 and Rome III |
| Italy | Regime election — separazione dei beni, conventional community, fondo patrimoniale — and a specific separation-conditional economic settlement upheld in Cass. 20415/2025; transfer formalities remain separate | The assegno divorzile cannot be waived | Outside the contract | Any time, by atto pubblico; a change needs every original party (art. 163) | 2016/1103 and Rome III |
| Cyprus | Assess each proposed property clause under Law 232/1991 and the applicable-law rules | By the court | Outside the contract | Assess the proposed agreement and its timing; no blanket conclusion from s. 26A | Choice of law is subject to Regulation 2016/1103, including mandatory rules and temporal scope |
| England and Wales | Almost anything on assets | A spouse or the children cannot be left in need | Outside the contract | Historically stronger than a prenup — no eve-of-wedding pressure | The court applies English law whatever the clause says |
| United States | Assets and alimony | Waivable in many states absent unconscionability | Child support and custody cannot be locked in | Treated more strictly than a prenup in some states | The forum applies its own standards |
| Israel | Property and resource balancing | Provided for | Outside the contract | Available with approval by a competent family or religious court | By Israeli conflict rules |
| UAE | Property and the financial terms of the marriage | Remains subject to court control | Outside the contract | Available under the civil regime | Non-Muslim foreigners: either spouse may insist on the law of their home country (art. 1(1) Decree-Law 41/2022); by agreement, another UAE personal-status law (art. 1(2)) |
| China | Ownership of pre-marital and marital property — separate, joint or partly joint | Economic assistance to a spouse in hardship, by agreement or by the court (art. 1090) | Outside the contract | Equally valid | Law of either spouse’s habitual residence or nationality, or of the main property’s location (art. 24 of the 2010 Choice-of-Law Act) |
Three groups come out of the pair. The civil-law group — Russia, Kazakhstan, Germany, Switzerland, France, Spain and Italy — generally requires a public deed and then enforces the result, with a fairness filter that varies from the German Inhaltskontrolle to the Russian “extremely unfavourable” proviso. The common-law group — England, the United States, and Israel with its approval requirement — makes the form trivial and the signing procedure decisive: disclosure, independent advice and time to reflect are what the court will examine years later. Cyprus calls for separate analysis of the clause, Law 232/1991 and the applicable-law rules; s. 26A is not a universal answer on prenup enforceability. China sits apart from both groups: plain writing suffices, but the agreement binds outsiders only if they knew of it.
The cheapest way to lose a contract is the form column, not the substance one. A German deed signed by the parties on different days, a Portuguese convenção executed after the wedding, an Israeli agreement made during the marriage without the court — each is not a weak contract but no contract. In England the mirror failure is the opposite: the deed is formally fine and collapses because one side had no separate lawyer and no schedule of assets.
Choice of law closes the gap only where a court will read the clause. Regulation 2016/1103 fixes the property regime for the EU states that participate, Rome III adds the law of the divorce itself, and Art. 161 of the Russian Family Code offers the same option to spouses with no common citizenship or residence. English and American courts will judge the contract by their own rules whatever law it names — which is why a family with English or US exposure ends up with mirror agreements rather than one governing-law clause. Where the case will actually be heard is a separate decision, set out in cross-border divorce jurisdiction and in the divorce navigator.
Advice, court review and recognition
The third table covers what gets examined years later: whether each side had its own lawyer and the full picture of assets, how far a divorce court can still reopen the bargain, what happens to a contract signed in another country, and whether Regulation 2016/1103 applies at all.
| Jurisdiction | Independent advice and disclosure | Court review at divorce | A contract signed abroad | Regulation 2016/1103 |
|---|---|---|---|---|
| England and Wales | Not statutory, but missing advice or disclosure cuts the weight under Radmacher | Full: s. 25 MCA 1973, needs prevail | A factor, whatever law and form it carries | Not bound |
| United States | UPMAA: access to independent counsel and adequate disclosure; California: counsel or a written waiver, and seven days to sign (Fam. Code § 1615(c)) | Unconscionability; child terms always reopen | Choice-of-law clauses generally honoured, forum public policy last | Not bound |
| France | Not required; the notary advises both | Narrow: the prestation compensatoire is fixed at the divorce | Formal test: writing, date, signatures, plus residence-state formalities (arts. 23–25 of the Regulation) | Participant |
| Spain | Not required; the notary advises both | Void if contrary to law or to spousal equality (art. 1328 Civil Code) | Same Regulation test | Participant |
| Italy | Not required; notary | Support for the weaker spouse cannot be contracted away | Same Regulation test | Participant |
| Germany | Not required; the notary must instruct both (§ 17 BeurkG) | Two stages: validity at signing, exercise at divorce | Same Regulation test | Participant |
| Switzerland | Not required; notary | Within the statutory regimes; maintenance set by the court | Valid in form under the applicable law or the law of the place of signing (art. 56 PILA) | Not an EU state |
| Portugal | Independent advice is distinct from the civil-registry or public-deed form | Regime must stay within legal limits; post-wedding changes only within statutory exceptions (Arts. 1714–1715) | Same Regulation test | Participant |
| Cyprus | — | Check the particular clause under the applicable property and contract law | Foreign execution does not by itself resolve enforceability | Participant |
| Israel | The approving body checks free and informed consent | The approval is the review | By Israeli conflict rules | Not an EU state |
| Russia | Not required; the notary explains the consequences | Art. 44 Family Code: an “extremely unfavourable position” | Form: governing law, place of signing or Russian law (art. 1209 Civil Code) | Not an EU state |
| Kazakhstan | Not required; notary | The same unfavourable-position test | Art. 275 gives the conflict rule, not a complete test of a foreign contract's form, validity and effects on third parties | Not an EU state |
| UAE | — | Post-divorce support set by the court on the art. 9 factors of Decree-Law 41/2022 | Honoured for non-Muslims under the civil regime | Not an EU state |
| China | Not required | General contract defences | A law chosen under art. 24 is applied | Not an EU state |
Read together, the three tables sort the fourteen jurisdictions by where the risk sits. In the notarial world — France, Spain, Italy, Germany, Switzerland, Russia and Kazakhstan — public-deed requirements are distinct from independent advice and substantive validity, and the danger arrives later, from a fairness review that each system runs its own way: the German two-stage control, the Russian Art. 44, the Italian ban on waiving divorce support. In England and the United States the form is light and the file is heavy: counsel, disclosure and time are what the court examines, and California has turned the time into a statutory seven days. Israel and the UAE tie the contract to an act of the state — approval or marriage registration; China asks only for writing but protects creditors who never heard of the agreement.
The Regulation column explains why one contract is enough for some couples and not for others. Inside the eighteen participating states a written choice of law survives relocation, and a contract signed elsewhere is tested for form by one uniform rule. Outside — England, the United States, Switzerland, Russia, Kazakhstan, Israel, the UAE and China — each forum applies its own conflict rule, and a family with assets there needs a contract drafted to satisfy that rule or a mirror text.
Profile → where to sign
| Couple | The binding constraint | Where to sign | The package |
|---|---|---|---|
| Two EU residences, assets in a third EU state | The default regime follows the first common residence | Before a notary in either residence state | One deed with a 2016/1103 choice of law, plus a Rome III clause for the divorce |
| One spouse in England or the United States | The forum applies its own rules and tests the signing procedure | In that jurisdiction, with separate lawyers; in California no sooner than seven days after the final text | A local prenup with a disclosure schedule, mirroring the continental deed |
| Assets or residence in Cyprus | Clause-specific enforceability and applicable law must be established | Where the applicable form requirements can be met | Valid choice of law and coordinated local instruments; foreign signing or an asset-holding structure does not itself guarantee enforcement |
| Couple moving to Switzerland | Under Art. 55 PILA, a change of the spouses' domicile normally changes the governing law retroactively. A written exclusion removes retroactivity; a written continuation of prior law or an existing marriage contract instead prevents the move from changing that law. | Before a Swiss notary, before or at the move | A marital agreement, or a written exclusion of retroactivity |
| Russian or Kazakh couple relocating | The notarial contract is safe at home and only a factor abroad | At home before the move, then in the destination | Art. 161 choice of law where available (Kazakhstan's Art. 275 uses common/last common residence and a territorial fallback; assess any foreign contract separately), plus a mirror text |
| Non-Muslim couple with Dubai assets | Personal status, not tax, decides | In the UAE, with the civil marriage registration | Terms under art. 6 of Decree-Law 41/2022, coordinated with the home-country deed |
| One spouse Chinese, assets on the mainland | Third parties are bound only if they knew | In writing in China, notarised | An art. 24 choice of law and disclosure to lenders and co-owners |
| Israeli couple | Validity depends on approval | Before the wedding: notary or marriage registrar; after it: the family court | An approved agreement, mirrored where the assets sit |
Q/A
Does Cyprus reject every agreement about a future divorce?
That conclusion does not follow from Cap. 149 s. 26A: its subject is dowry-type property promises, subject to its exceptions. Other marriage-related contracts have the form requirements in s. 77(2). A particular clause still requires analysis under Law 232/1991 and the applicable-law rules; signing abroad is no guarantee of enforcement. Separately, the statutory property-participation claim under s. 14 has a three-year limitation after dissolution or annulment.
Can a contract be signed after the wedding everywhere?
No. Russia, Kazakhstan, Germany, Switzerland, Spain and the UAE all allow a mid-marriage contract on the same terms as a pre-marital one, and England treats a postnup as stronger because the eve-of-wedding pressure argument disappears. Portugal's convention must precede marriage; later changes are restricted to statutory exceptions. Under Portuguese law, if either spouse is at least 60 at marriage, separation is mandatory. Israel allows it but only with court approval, and some US states apply a stricter standard to postnups than to prenups.
Will one prenuptial agreement work in every country?
No. Form, admissibility, weight and public policy are tested separately in each country. Regulation (EU) 2016/1103 can provide one law for the matrimonial property regime, but it does not remove local rules on form, jurisdiction or third-party protection. Every country holding assets or likely to hear a dispute must be tested before signature.
Can spouses choose the law for their property under Regulation 2016/1103?
Yes, in participating states they may choose the law of a state where either spouse is habitually resident, or of either spouse’s nationality, when the agreement is made. The choice must be written, dated and signed, while additional formalities of the residence state and applicable law remain. A later move does not by itself cancel that choice.
Is a foreign prenup automatically binding on an English court?
No. Under Radmacher the court gives weight to an agreement entered into freely, with appreciation of its implications, where applying it remains fair in the circumstances. Judicial discretion under s. 25 of the Matrimonial Causes Act remains: foreign notarisation alone does not make the agreement unconditionally binding.
Can a prenup determine child custody and residence in advance?
No, not as a result binding on the court. Russian Family Code Art. 42 excludes rights and duties concerning children from a marriage contract; in England the child’s welfare remains the court’s paramount consideration. In a cross-border case jurisdiction and current welfare are assessed when the dispute arises, although the agreement may record parental intentions.
Are mirror agreements required whenever assets sit in several countries?
Not always. Local counsel should first test whether one agreement, with a valid choice of law and form, is sufficient; mirror texts are useful where form or enforcement requirements diverge. They must be coordinated: a mirror agreement does not guarantee recognition, while conflicting terms can create a new dispute.
Which of the fourteen jurisdictions insist on a separate lawyer for each spouse?
None as a universal statutory condition. California comes closest: under Family Code § 1615(c) a contract is presumed involuntary unless the spouse had independent counsel or waived it in a separate writing, and had at least seven calendar days with the final text. The UPMAA speaks of access to counsel and adequate disclosure; in England missing advice is a Radmacher factor that reduces weight. In the notarial countries the notary’s duty to explain the deed stands in for separate advice.
Does a Chinese marital property agreement bind a bank that lent to one spouse?
Only if the bank knew of it. Article 1065 of the Civil Code makes the written agreement binding between the spouses, but a debt owed by one spouse is paid from that spouse’s separate property only where the creditor was aware of the agreement. In practice the agreement is notarised and disclosed to lenders and co-owners at the time of each transaction.