A prenuptial and matrimonial-property plan for a cross-border family

A family whose members live in one country, hold assets in another, and plan to marry under the law of a third is sitting on a structural problem that most standard prenuptial processes were not designed to solve. The documents a local family-law firm produces in London, Dubai or Moscow may be entirely valid at home and entirely unrecognised where the wealth actually sits. For a principal whose holding structure runs through Hong Kong or an offshore centre, that gap is not a theoretical concern – it is an enforcement risk that becomes real the moment a marriage breaks down or an estate falls open.

A cross-border prenuptial and matrimonial-property plan coordinates the governing law, the documentary form and the structural decisions across every jurisdiction where the family has meaningful exposure. The Trustee Ordinance (Cap. 29, Hong Kong), reformed with effect from 1 December 2013, provides a strong foundation for Hong Kong-law trusts in this context: forced-heirship claims from foreign jurisdictions are resisted by statute, and there is no perpetuity period to cap the trust's life. The plan works outward from that foundation to the other legal systems the family actually touches.

This note sets out when a cross-border principal needs a matrimonial-property plan, how we run the engagement alongside locally licensed counsel, what the client must own in the process, and what the first step looks like.

When does a cross-border principal need this?

The trigger is almost always structural complexity rather than imminent litigation. A principal with assets in a BVI or Cayman holding vehicle, a Hong Kong operating company, and residential property in Europe or the Gulf is already operating across at least three legal systems. Marriage adds a fourth: the law of the matrimonial domicile, which often has its own default property regime that applies unless the parties have contracted out of it.

In our cross-border practice, the moment that concentrates minds is usually one of the following. A principal is about to marry and the family office has just flagged that the intended spouse's home jurisdiction imposes a community-property regime by default. Or a family is restructuring a holding vehicle – perhaps migrating from a European jurisdiction to Hong Kong – and counsel on the receiving end raises the question of how the new structure interacts with the existing marriage contract. Or succession planning has surfaced a forced-heirship exposure: the spouse is a national of a civil-law jurisdiction that reserves a portion of the estate for the surviving spouse, and the family's current structure does nothing to address it.

Each of those triggers points to the same gap: a matrimonial-property plan that was either never built or was built for only one jurisdiction. The cross-border element does not complicate the plan – it defines the plan. Any adviser who treats it as a Hong Kong domestic matter will miss the exposure entirely.

How does forced heirship and succession law interact with a matrimonial-property plan across jurisdictions?

Forced-heirship rules and matrimonial-property regimes operate at different levels, but they collide in a cross-border estate and must be mapped together. Hong Kong imposes no forced-heirship obligations on a testator: a Hong Kong-domiciled individual may leave assets entirely to a spouse, entirely to children, or to a trust, without any statutory minimum share. That freedom is a genuine structural advantage and it is one reason Hong Kong trusts appear prominently in cross-border family plans.

The Trustee Ordinance's 2013 reform strengthened that position further. A Hong Kong trust is not invalidated because a foreign forced-heirship rule would reach the same assets if they were held differently. The firewall is statutory. But the firewall operates at the trust level – it does not prevent a foreign court from making a matrimonial-property order over assets that sit outside the trust, or from characterising a distribution from the trust as a matrimonial asset under its own rules.

That interaction is where the plan earns its value. A principal whose BVI holding vehicle has never been settled into trust, whose Hong Kong property is held in personal name, and whose residence is in a community-property jurisdiction has exposed substantially all of the family's assets to matrimonial claims governed by foreign law. A structured plan addresses each layer: which assets enter a Hong Kong trust, which remain outside and need a governing-law clause in the matrimonial agreement, and how the succession documents (wills, letters of wishes, shareholder agreements) align with the matrimonial-property choices made.

Succession planning across Hong Kong and the relevant home jurisdictions is a closely connected practice. Our guide to succession planning across Hong Kong and the United Kingdom addresses the interaction between HK trusts and UK succession law for principals in that corridor. For principals in CIS jurisdictions, our briefing on succession planning across Hong Kong and the CIS covers the same terrain for a different legal family.

What the succession notes make clear – and what the matrimonial-property plan must also reflect – is that each jurisdiction along the family's map applies its own conflict-of-laws rules to determine which law governs a given asset or status question. Getting that mapping wrong at the planning stage means a document that appears valid in one place is challenged or disregarded somewhere else.

The route we run: step by step

We start with a jurisdiction map. Before any document is drafted, we identify every jurisdiction where the family has a material connection: residence, domicile, nationality, asset location and the planned matrimonial domicile. Each of those connections is a potential governing-law hook, and more than one jurisdiction may claim authority over the same asset or status question.

From that map we build a hierarchy of legal exposure. Not every jurisdiction requires action. What matters is the sequence: which system has the strongest claim over the most valuable assets, and which system's recognition of the matrimonial agreement is most critical to the plan working. That analysis shapes the document strategy.

The core document is usually a prenuptial agreement (or, for principals already married, a postnuptial agreement with equivalent effect). Drafting happens in layers. The agreement's governing law and form must satisfy the requirements of the jurisdictions where recognition is sought – not just the place of signature. For a Hong Kong-centred structure, the agreement will typically specify Hong Kong law as governing, address the treatment of trust interests directly, and contain declarations about the parties' independent legal advice and financial disclosure.

Hong Kong law is not codified family law in the sense that civil-law systems are. The courts have a broad discretion in ancillary-relief proceedings, and a prenuptial agreement does not bind a Hong Kong court in the way a contract binds parties in a purely commercial matter. However, a well-drafted agreement with proper independent advice, full financial disclosure and no overreaching provision carries very significant weight. It narrows the field of dispute materially.

This is the point at which locally licensed Hong Kong family-law counsel joins the engagement. They advise on the agreement's form, the disclosure requirements and the procedural steps that give the document its evidential weight before the Hong Kong courts. We coordinate the cross-border and structural elements; they handle the Hong Kong-law instrument. The client engages both under a single coordinated plan, not as two parallel processes that may contradict each other.

Alongside the prenuptial agreement, we review and where necessary restructure the holding architecture. Assets in a Hong Kong-law trust settled before marriage, with properly reserved settlor powers under the Trustee Ordinance, sit in a different legal position from assets held in a personal holding company or directly in the principal's name. The structural decisions must be made before the agreement is finalised, because the agreement's schedules need to describe the trust interests accurately to take effect as intended.

The cross-border interface: Hong Kong, offshore centres and the family's home jurisdiction

Hong Kong acts as the structural hub in most of the plans our desk builds for international families. The common-law system, the absence of forced heirship, the Trustee Ordinance firewall and the lack of capital gains tax or withholding tax on trust distributions make it a rational centre of gravity for the family's holding architecture. But Hong Kong is rarely the only jurisdiction that matters.

Consider a principal who is a national of a Central Asian jurisdiction, resident in the UAE, with a BVI holding company sitting above a Hong Kong operating business and European real property held in a Luxembourg vehicle. That family's matrimonial-property exposure is genuinely five-jurisdictional. The matrimonial agreement governed by Hong Kong law will have evidential weight in Hong Kong proceedings. It may or may not be recognised in the UAE, depending on applicable UAE private international law. It has no automatic standing before a Luxembourg court dealing with the European property. And the BVI holding company adds its own layer: BVI corporate law governs the shares, but matrimonial proceedings in multiple jurisdictions might attempt to reach the underlying value.

The plan we build addresses the interface at each junction. Where recognition of the Hong Kong agreement is doubtful in a material jurisdiction, we advise on whether a parallel instrument – governed by that jurisdiction's law and prepared by allied counsel admitted there – is needed. Where the BVI or Cayman holding company is central, we review whether its articles and any shareholders' agreement contain provisions that either support or undermine the matrimonial-property position. These are not abstract points: they are the decisions that determine whether the plan holds when tested.

On enforcement: if a foreign court makes a matrimonial-property order that affects Hong Kong assets, the cross-border recognition question becomes acute. The Mainland Judgments in Civil and Commercial Matters (Reciprocal Enforcement) Ordinance (Cap. 645) came into force on 29 January 2024 and covers monetary and non-monetary civil judgments between Hong Kong and the Mainland. Matrimonial and succession matters fall outside its scope by statutory exclusion. That exclusion confirms that matrimonial proceedings between the two systems run on a different track – which makes the up-front structural work more important, not less: an asset correctly settled into a Hong Kong trust before a dispute arises is in a fundamentally different position from one left in an exposed structure.

For the full scope of our private wealth practice, including our approach to trust structuring, family-office governance and succession across multiple systems, visit the practice page.

What the client must own in this process

A matrimonial-property plan is not a product that a team of advisers can deliver to a passive client. It requires decisions – genuine decisions, made by the principal – that no adviser can make on their behalf. Understanding what those decisions are, and why they matter, is part of what we do in the first engagement.

The first decision is financial disclosure. A prenuptial agreement drafted without full mutual disclosure is vulnerable. In Hong Kong proceedings, a court will look at whether both parties knew what they were agreeing to. A principal who schedules only part of their asset picture – omitting a trust they believe the other party does not know about – is creating a document that may be set aside at the worst possible moment. The disclosure must be accurate, structured and documented.

The second decision is the treatment of trust interests. If the principal is the settlor of an existing trust, the matrimonial agreement needs to address that interest explicitly. How it is addressed – as an asset, as a discretionary expectation, or as an excluded matter – is a structural decision with long-term consequences for the trust's integrity and for the agreement's validity.

The third decision is the governing law and execution formalities. For some jurisdictions, notarisation is required. For others, the presence of independent legal advisers at execution must be documented. These are not administrative points: they are the conditions precedent to recognition. A principal who travels on the day of signature without the right formalities in the right jurisdiction has produced a document with a structural defect that may not surface until it is too late to cure.

The fourth decision is the review cycle. A matrimonial-property plan built around the family's current position needs to be revisited when the holding structure changes, when residence changes, or when a new asset class (including digital assets or a new operating business) enters the picture. We build that cycle into the engagement from the start.

The sequence above describes the standard position. Your matter turns on the documents, the jurisdictions actually engaged, and the order of steps – which is where the route is won or lost. For a structured assessment of your matrimonial-property position across the relevant jurisdictions, write to us at info@lockhartyip.com.

Common structural errors and what foreign principals get wrong

In our cross-border practice, we see a consistent set of errors when principals approach this work without coordinated international counsel. Each of them is avoidable.

The most common is treating the prenuptial agreement as a domestic document. A principal who commissions a prenuptial agreement from family-law counsel in their home country, without any review of how that document interacts with the law of the jurisdiction where most of the assets sit, has produced a document that may have no effect where it most needs to. The governing-law choice in the agreement, and the conflict-of-laws rules of the jurisdictions involved, must be addressed explicitly.

The second error is leaving the holding structure unchanged. A prenuptial agreement that describes assets held in personal name as "excluded" or "separate property" does not convert a personal holding into a trust. The structural work – settling assets into an appropriate vehicle, with proper documentation of timing relative to the marriage – must happen before or alongside the agreement, not after.

The third error is failing to coordinate the agreement with the succession documents. A will that leaves the principal's entire estate to children from a prior relationship, combined with a prenuptial agreement that excludes the spouse from the operating business, may be internally consistent – or it may not be, depending on the forced-heirship law of the spouse's nationality, the domicile rules of the relevant jurisdictions, and the trust's distribution provisions. Uncoordinated documents produce unintended outcomes.

A fourth error – less common but more consequential – is treating the postnuptial agreement as a fallback option with the same standing as a prenuptial. In several jurisdictions, a postnuptial agreement faces a higher standard of scrutiny because the parties are no longer at arm's length in the same way as before marriage. Where the window to act is before the marriage, that window should be used.

If an earlier filing, structure or enforcement attempt produced an adverse or stalled result, a second review of the structural position can identify the error and the routes still open. Write to info@lockhartyip.com with a summary of the position.

Micro-scenario A: European principal, BVI holding, Hong Kong trust

A European principal with a BVI holding company above a Hong Kong operating business came to our desk in early 2026 in advance of a planned marriage. The intended spouse was resident in a community-property jurisdiction. The principal had assumed the BVI structure was sufficient to ring-fence the business from any matrimonial claim. It was not: the BVI shares were held in personal name, and a matrimonial court in the spouse's home jurisdiction had authority under its own private international law to characterise those shares as community assets.

We coordinated a two-track response. First, we worked with the principal to settle the BVI structure into a Hong Kong discretionary trust under the Trustee Ordinance, timed and documented relative to the marriage date. The trust's deed reserved specific powers to the settlor within the statutory limits introduced by the 2013 reform. Second, we coordinated a prenuptial agreement – governed by Hong Kong law, with a parallel instrument prepared by allied counsel in the home jurisdiction – that addressed the trust interest explicitly and documented the disclosure and independent-advice requirements for both systems. The plan also aligned with the existing succession documents to avoid any conflict between the matrimonial-property position and the intended distribution on death.

Micro-scenario B: CIS family, Hong Kong office, UAE residence

A principal based in the UAE, with a significant shareholding in a CIS operating group and a Hong Kong regional office structure, engaged our desk following a change in residence status in late 2026. The relocation had triggered a review of the family's succession and matrimonial-property arrangements. The existing prenuptial agreement had been drafted in a CIS jurisdiction under local law and had never been reviewed for recognition elsewhere.

We mapped the family's jurisdictional exposure across the CIS home system, the UAE, and Hong Kong. The existing agreement's governing-law clause was effective for the CIS, but the document had no standing in Hong Kong or the UAE without additional steps. We advised on the structural realignment required – including whether a Hong Kong trust was appropriate for the principal's specific circumstances – and coordinated the drafting of a supplementary instrument governed by Hong Kong law. Allied counsel in the UAE addressed the recognition requirements there. The result was a coordinated plan covering the three principal systems the family actually touches, each document prepared to the recognition standard of its target jurisdiction.

The self-assessment: is your current position adequate?

A cross-border family with assets in more than one jurisdiction can use the following questions as a first-order check.

• Does the principal's home or matrimonial-domicile jurisdiction impose a default matrimonial-property regime? If so, has the family contracted out of it in a form that will be recognised where the assets sit?
• Are the principal's assets in personal name, in a company, or in trust? Has the trust been correctly settled and documented relative to the marriage date?
• Does the prenuptial or postnuptial agreement specify a governing law? Is that governing law the one that will actually be applied by the court most likely to hear a dispute?
• Has full financial disclosure been given and documented? Have both parties received independent legal advice, evidenced in the execution formalities?
• Has the matrimonial-property plan been coordinated with the succession documents – wills, trusts, letters of wishes, and shareholder agreements – so that they do not contradict each other?
• Has the plan been reviewed since the last change in residence, structure or asset profile?

If any of those questions produces an uncertain answer, the plan has a gap. The appropriate step is a structured review across the relevant jurisdictions, not a patch to the existing documents.

Related practices

• Private Wealth – succession, trust structuring, family-office governance and cross-border estate planning
• Holding Structures – BVI, Cayman and Hong Kong holding architecture for international families and groups
• Tax Positions – FSIE regime, Pillar Two exposure and residence-based tax planning for cross-border principals

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• Private Wealth
• Succession Planning Across Hong Kong United Kingdom Uk 5
• Succession Planning Across Hong Kong Cis Cis Briefing

This publication is general information and does not constitute legal advice. For advice on your situation, contact info@lockhartyip.com.