How to approach a prenuptial and matrimonial-property plan for a cross-border family

A high-net-worth family with assets in Hong Kong, a holding entity in the British Virgin Islands, a residential property in the United Kingdom, and one spouse carrying citizenship from a civil-law jurisdiction faces a structural question that no single lawyer can answer alone. Which law governs the marriage? Which law governs the property? Which court will have jurisdiction if the relationship ends? And, critically, will the agreement reached in one jurisdiction be recognised where the assets actually sit?

A prenuptial and matrimonial-property plan for a cross-border family is a co-ordinated legal structure – typically built around a well-drafted pre-marital agreement, a supporting trust or holding arrangement, and a considered choice of matrimonial domicile – that addresses the governing law, the enforcement route, and the interaction with succession and forced heirship across every jurisdiction where the family has a material connection. In Hong Kong, the framework for this work sits under the Matrimonial Proceedings and Property Ordinance, the Trustee Ordinance (Cap. 29), and the common-law principles on the recognition of foreign agreements. The 2013 reform of the Trustee Ordinance, which abolished the rule against perpetuities and strengthened firewall protection against foreign forced-heirship claims, made Hong Kong a materially more useful platform for this kind of planning.

This guide walks through the practical sequence: from the initial audit to the final execution steps, with the gate-check at each stage and the common mistake to avoid at each turn.

What decision does the family actually face – and why does the cross-border element change it?

Most families approaching this planning believe the question is simply whether to have a prenuptial agreement. In a purely domestic setting, that framing is workable. In a cross-border context, it is the wrong starting point.

The real question is: across the jurisdictions where this family has property, earns income, is domiciled, or may eventually litigate, which legal regime will govern the distribution of assets on separation, death, or incapacity – and is that the regime the family would choose? Those three triggers often point to different answers. Separation may be litigated in a jurisdiction with generous community-property (a matrimonial-property regime under which assets acquired during the marriage are owned jointly by the spouses) principles, while the underlying trust was established under a law with no such concept. Death may trigger forced-heirship obligations in one jurisdiction that the family assumed were resolved in another.

In our cross-border private-wealth practice, we regularly see families who have signed a pre-marital agreement drafted in one jurisdiction without having mapped its recognition prospects in the jurisdictions where the wealth actually resides. The agreement is real. Its enforceability across the border is not.

The cross-border element does three things to the planning exercise. First, it multiplies the number of governing-law questions. Second, it means that a structuring decision taken for one purpose – for example, placing assets in a discretionary trust for estate-planning reasons – can have unintended consequences for the matrimonial-property analysis in another jurisdiction. Third, it introduces the problem of conflicting proceedings: in some circumstances, a spouse may have the right to commence matrimonial proceedings in more than one jurisdiction, and the forum chosen will determine the substantive outcome.

Step 1 – Map the family's jurisdictional footprint before any document is drafted

The first and most important step is a jurisdictional audit, not a document review. Until the family's map is complete, any agreement is provisional.

The audit covers four categories. First, personal status: nationality, domicile, and habitual residence of each spouse, and any children. Second, assets: each material asset or asset class, the jurisdiction where it is situated, and the entity through which it is held. Third, income and business: where the operating businesses sit, the tax residence of the entities, and whether any business is held through a BVI or Cayman vehicle that itself sits above a Hong Kong intermediate holding company. Fourth, forward-looking factors: a realistic assessment of where the family may be living in ten years, taking into account education, business operations, and any pending residence or immigration steps.

This audit will typically surface at least one jurisdiction the family had not considered relevant. A Hong Kong-resident family with a European parent company may discover that the civil-law régime matrimonial légal (the default matrimonial-property regime that applies automatically in many civil-law systems absent a contrary agreement) has already attached to assets the family believed were governed solely by Hong Kong common law. Identifying this early is the gate that makes the rest of the planning coherent.

The audit should produce a one-page summary: a list of jurisdictions engaged, the governing-law position in each absent any agreement, and the points where those positions conflict with each other. That summary becomes the instruction document for every adviser who touches the matter thereafter.

Step 2 – Identify which law should govern the matrimonial-property regime, and whether that choice will be recognised

Once the map is drawn, the family must decide which law should govern. This choice is not unlimited. Jurisdiction-selection provisions in a pre-marital agreement will be recognised in some systems and ignored in others. A Hong Kong court applying common-law principles will give weight to a parties' expressed choice of governing law, but will apply a public policy filter: an agreement that is manifestly unfair, procured under duress, or reached without independent legal advice may not be given effect even if the chosen law permits it.

The analysis in civil-law jurisdictions is different. Several EU member states have incorporated the Rome III Regulation (an instrument that allows spouses to choose the law applicable to their divorce) and the Matrimonial Property Regulation (the EU instrument governing the law applicable to matrimonial-property regimes for international couples). These instruments create a defined menu of law choices. A Hong Kong family with European domicile connections should take advice on whether to make a formal choice within those frameworks or whether doing so would constrain the position in Asia.

The gate-check at this step is recognition. For every choice of law made, the family's advisers must confirm in writing that the choice will be given effect in each jurisdiction identified in the Step 1 audit. Where it will not, a structural solution – typically a trust or a holding arrangement – may need to fill the gap.

Step 3 – Structure the holding arrangement to be consistent with the matrimonial-property plan

Pre-marital agreements operate at the level of personal obligations. The underlying asset structure operates at the level of property rights. The two must be consistent, or the agreement will be vulnerable.

In Hong Kong, the Trustee Ordinance (Cap. 29), substantially reformed with effect from 1 December 2013, provides a strong platform for this work. The 2013 reforms abolished the rule against perpetuities for Hong Kong trusts, permitted settlors to reserve certain powers without invalidating the trust, and strengthened the firewall protecting Hong Kong-law trusts against foreign forced-heirship claims. These features matter directly in the matrimonial-property context: a discretionary trust, properly established, can place assets outside the matrimonial estate in many jurisdictions – but only if the structure was established before the marriage, on terms that reflect the matrimonial-property intention, and in a jurisdiction whose courts will give it effect.

There is a well-documented tension in Hong Kong case law – and in equivalent common-law systems – around trust assets in ancillary-relief proceedings. Where a court concludes that a spouse has or will have real benefit from a trust, it may treat the trust as a resource available to that spouse for the purposes of a financial-relief order. The structure must be designed with this risk in mind from the outset, not retrofitted after the matrimonial proceedings have begun.

Where the family holds assets through a BVI or Cayman intermediate vehicle, the matrimonial-property analysis in the jurisdiction of the asset may look through the corporate form and assess the underlying beneficial interest. The audit at Step 1 should have identified this; the structural work at Step 3 must address it.

This step also covers the interaction with succession. A discretionary trust that serves the matrimonial-property plan may also serve the succession plan – or it may conflict with it if the trust terms were drafted with only one purpose in mind. Our desk sees this conflict regularly on matters that involve families with assets in common-law and civil-law jurisdictions simultaneously. The resolution is to draft both the agreement and the trust deed with the full map visible.

Step 4 – Draft and execute the pre-marital agreement itself

With the map drawn (Step 1), the governing-law choice confirmed and tested for recognition (Step 2), and the holding structure aligned (Step 3), the pre-marital agreement can be drafted. At this stage, the agreement should be performing a narrower function than most families expect: it records the agreed position, confirms the governing-law choice, and creates an evidentiary record. The structural work has already done the heavier lifting.

Effective execution requires specific procedural steps in most jurisdictions. Both parties should have independent legal advice, documented in writing and ideally contemporaneous with the signing. The agreement should be executed with sufficient time before the marriage to make it clear that neither party was under time pressure. Full financial disclosure is a standard condition in common-law jurisdictions; without it, the agreement is vulnerable to a challenge on the grounds of non-disclosure.

Where the parties are signing across jurisdictions – one in Hong Kong, one abroad – the execution should be managed to ensure that the formality requirements of all relevant jurisdictions are met. In some civil-law systems, a pre-marital agreement is only valid if executed before a notary; a private written agreement, however carefully drafted, will have no legal effect there. This is not an administrative point: it is the difference between an agreement that works and one that does not.

The agreement should also address the amendment procedure. A family's jurisdictional footprint will change over time. The agreement should contemplate how it is to be varied if, for example, the family relocates from Hong Kong to a Gulf state, or acquires assets in a new jurisdiction. A well-designed agreement includes an amendment mechanism that itself satisfies the formality requirements of the most demanding jurisdiction currently engaged.

Step 5 – Test the plan against the forced-heirship and succession map

Matrimonial-property planning and succession planning address the same pool of assets from different directions. A plan that resolves the matrimonial-property position without addressing the succession consequences is incomplete.

Hong Kong law has no forced-heirship regime. Assets held under a Hong Kong-governed structure can, in principle, pass on death in any manner the settlor or testator directs. The 2013 reform of the Trustee Ordinance strengthened this position specifically by enhancing the firewall against foreign forced-heirship claims brought against a Hong Kong-law trust. This is a material advantage for families with connections to civil-law jurisdictions where forced heirship operates at the level of national law.

However, the firewall is not absolute. Where a family member who is a forced heir under a foreign law has sufficient connection to that jurisdiction, and where the assets are physically situated there or the relevant entity is incorporated there, the foreign court may apply its own rules and reach a different result. The plan must identify these exposure points and decide, for each, whether structural protection is achievable and proportionate.

The interaction between the matrimonial-property plan and the succession plan will also arise on death during the marriage. If a spouse dies while married, the matrimonial-property regime in the relevant jurisdiction will determine what portion of the estate is the survivor's own property before the estate of the deceased is calculated. In a civil-law community-property jurisdiction, the surviving spouse may already own half of the matrimonial assets before the deceased's estate is opened. The succession plan must model both outcomes: what happens on death and what happens on separation.

For a fuller treatment of succession structures across offshore centres, see our guidance on will and estate planning covering assets in the Cayman Islands and the private-wealth practice overview.

The most common mistake – and how this sequence avoids it

The most common mistake in cross-border matrimonial-property planning is drafting the agreement first and mapping the jurisdictional exposure second. The result is an agreement that is internally coherent but externally incomplete: it works in the jurisdiction where it was drafted and fails in every other jurisdiction where it matters.

This mistake is compounded when the holding structure and the matrimonial-property plan are designed by different advisers who have not compared notes. A trust that is impeccably designed for estate-planning purposes may be entirely counterproductive for matrimonial-property purposes if the terms give one spouse a degree of control that a foreign court will treat as outright ownership.

The sequence in this guide – audit first, governing-law choice second, structure third, agreement fourth, succession test fifth – avoids this by ensuring that every document is drafted against the full map. The audit reveals conflicts before they are locked in. The governing-law step ensures that the agreement will be recognised where it needs to be. The structural step ensures that the asset-level position supports the agreement-level position. The succession test ensures that the plan works across both the separation and the death scenario.

A parallel point concerns timing. An agreement signed shortly before a wedding, without evidence of independent legal advice and financial disclosure, is vulnerable in almost every common-law jurisdiction. Starting the process at least twelve months before the contemplated marriage date is, in our experience, the minimum that allows each step to be completed properly.

Families with UAE-connected assets face additional considerations around the interaction between the personal-status law of the UAE and the common-law position in Hong Kong; those considerations are addressed in our separate briefing on asset protection for principals with UAE exposure.

Decision checklist for the family and their advisers

Before the planning process begins in earnest, the family and their advisers should be able to answer each of the following questions. Where the answer is unclear, that gap becomes the first item on the work plan.

Personal status and domicile: What is the nationality and domicile of each spouse? Has either spouse changed domicile in the last five years, or is a change contemplated? Does either spouse have a civil-law domicile that would attract a default matrimonial-property regime?

Asset map: What are the material assets, and in which jurisdiction does each sit? Are any assets held through a BVI, Cayman, or other offshore vehicle? Has a trust already been established, and if so, in which jurisdiction and under which law?

Governing-law choices already made: Have any existing trust deeds, corporate constitutions, or other instruments made a choice of governing law that will affect the matrimonial-property analysis?

Forward-looking factors: Where is the family likely to be resident in ten years? Are there pending business transactions, inheritance events, or immigration steps that would change the jurisdictional map materially?

Succession interaction: Has a will or succession plan been prepared? Does it reflect the matrimonial-property position? Has the plan been tested in the jurisdictions where forced heirship may apply?

A clear yes or no to each of these questions is the gate to beginning the drafting phase.

Related practices

• Private Wealth – succession, trust structures, and asset protection across jurisdictions
• Holding Structures – BVI, Cayman, and Hong Kong intermediate holding-entity design

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