Belgium Inheritance Law 2026: Cross‑border Choice‑of‑law, Forced Heirship & Tax

Inheritance law Belgium is an important area for cross-border families, because succession planning increasingly shapes the choices facing high-net-worth individuals, family offices and their advisers. If you hold assets in Belgium, are habitually resident there, or have heirs spread across several jurisdictions, the interaction between Belgian forced heirship, the EU Succession Regulation and regional inheritance tax now demands a deliberate plan rather than a default one. This guide takes a clear position: for most genuinely cross-border estates, an explicit choice-of-law election combined with a professionally drafted will is often the stronger strategy, but only where the formalities are met and the tax and public-policy risks are addressed.

Below you will find a plain-language explanation of the current framework, the mechanics of electing a foreign law, three common conflict scenarios, the tax consequences for resident and non-resident heirs, a ten-step checklist, a side-by-side decision table and a working sample clause.

Belgium’s modernised succession framework, headline points

Belgium’s succession framework was substantially modernised by the reform of the law of succession that entered into force on 1 September 2018, followed by further changes to the matrimonial property rules. These reforms aimed to increase testamentary flexibility while preserving core family protections, and cross-border families should treat any personal change in circumstances as a prompt to revisit existing wills and structures. The published legislative text (integrated into the Belgian Civil Code) and its transitional provisions are the authoritative reference, and any exact wording should be confirmed against the Belgian Official Gazette (Moniteur belge / Belgisch Staatsblad).

The broad objectives of the reform programme are consistent: to give testators more room to arrange their estates, to clarify the treatment of gifts made during the testator’s lifetime, and to align Belgian domestic rules more smoothly with the EU-wide framework for succession. For advisers, the practical message is that assumptions baked into wills drafted under earlier rules should not be carried forward without review.

Effective dates and transitional rules

Effective dates and transitional rules matter enormously in succession, because the law that applies is generally the law in force at the date of death, subject to specific transitional provisions. Where a will was drafted under an earlier regime, transitional rules determine whether older arrangements remain valid or require adaptation. Because these details are decisive for planning, the precise commencement dates and any grandfathering provisions should be verified directly in the published law via the Belgian Official Gazette before relying on them.

Which estates are affected

The rules are most relevant to estates with a Belgian connection: assets located in Belgium, testators habitually resident in Belgium, or heirs who are Belgian residents. Purely foreign estates with no Belgian nexus are unaffected by Belgian domestic succession law, though the EU Succession Regulation may still route them toward or away from Belgian law depending on habitual residence and any election made. In short, if there is a Belgian element in the estate, an apartment in Brussels, a holiday home on the coast, or a Belgian-resident child, Belgian rules are part of your analysis.

How inheritance law Belgium treats forced heirship

Forced heirship is the single feature of inheritance law Belgium that most often surprises internationally mobile families. Unlike common-law systems that generally permit near-total testamentary freedom, Belgian law reserves a protected portion of the estate, the réserve, for certain close family members. The testator can freely dispose only of the remaining part, the quotité disponible or freely disposable portion. This structure constrains estate planning and can frustrate objectives such as concentrating a family business in one child’s hands or making substantial charitable gifts.

The 2018 modernisation of Belgian succession law simplified and, in important respects, increased the freely disposable portion, giving testators more room than under the historic regime. Under the reformed rules, the reserved share of the descendants is set at one half of the estate regardless of the number of children, with the other half being freely disposable. Even so, a meaningful reserved share remains for protected heirs, and this is a matter of Belgian public policy that domestic courts guard closely. Because the exact fractions are the crux of any plan, they should be confirmed against the current statutory text and reviewed with counsel.

Who are forced heirs in Belgium?

The category of forced heirs under Belgian law centres on the deceased’s descendants, children, and through representation, grandchildren where a child has predeceased. The surviving spouse also enjoys strong protection, including a reserved usufruct over the family home and its contents, though the technical characterisation of the spouse’s entitlement differs from that of descendants. Since the 2018 reform, ascendants (parents) no longer enjoy a reserved share, but a maintenance claim may be available to them in certain circumstances. The precise categories and any subsequent changes should be verified against the statute and reviewed with counsel, because the identity of protected heirs drives the entire planning analysis.

Reserved share, examples and illustrations

To illustrate the mechanics, consider the general architecture. The estate is conceptually divided into the reserved portion, which is protected for descendants, and the freely disposable portion, which the testator may leave to anyone. Under the reformed rules the reserved portion of the descendants is fixed at one half of the estate and does not vary with the number of children in the way the historic rules provided, a deliberate simplification introduced by the reform. A worked example:

• Single child. Half of the estate is reserved for that child; the balance is freely disposable and can be left to a spouse, partner, charity or others.
• Multiple children. The children collectively share the same reserved half; the freely disposable balance remains available for other beneficiaries.
• Spouse alongside children. The surviving spouse’s protected rights (including usufruct over the family home) operate in addition to the descendants’ reserve.

The exact fractions and the interaction with the spouse’s rights should be confirmed from the published statute and reviewed with counsel, and are noted here as structural illustrations only.

Limits on testamentary freedom and typical planning levers

Because the reserved portion cannot simply be written out of a will, planning levers focus on the freely disposable portion and on lifetime arrangements. Common techniques used by Belgian and cross-border planners include lifetime gifts (subject to clawback and hotchpot rules that bring certain gifts back into account when calculating the reserve), marital property arrangements, matrimonial regime clauses, so-called global succession pacts (pactes successoraux, expanded by the 2018 reform), life insurance structures, and, critically for internationally connected clients, a choice-of-law election under the EU Succession Regulation to route succession to a legal system with different or weaker forced heirship. That last lever is the subject of the next section, and it is the pivot of most cross-border plans.

Choice-of-law under the EU Succession Regulation, electing a different law

Regulation (EU) No 650/2012, commonly called the EU Succession Regulation or Brussels IV, is the instrument that lets an individual with a Belgian connection reshape which national succession law applies. Its default rule is that the succession as a whole is governed by the law of the state where the deceased was habitually resident at death. Its most powerful planning feature, however, is the ability to elect the law of one’s nationality instead.

How the Regulation interacts with Belgian public policy

The Regulation permits a person to choose, as the law governing the whole of their succession, the law of a state whose nationality they possess at the time of making the choice or at the time of death. Where a person holds multiple nationalities, any of those laws may be chosen. This is the mechanism through which, for example, a British or Irish national habitually resident in Belgium can elect their national law and thereby seek to escape Belgian forced heirship over their estate.

The key limit is public policy. Under the Regulation, a court may refuse to apply a provision of the chosen law only where its application would be manifestly incompatible with the public policy (ordre public) of the forum. Belgian scholarship generally considers that the mere absence of forced heirship in a foreign law is not, by itself, contrary to Belgian public policy, so a valid election of a common-law national law is generally respected. Even so, planners should not assume that every result achievable under a foreign law will survive a Belgian public-policy check.

Where the point is contested, the case law of the Belgian Court of Cassation and the Court of Justice of the European Union is the guide, and any aggressive structure should be stress-tested against it.

Practical steps to elect foreign law (sample wording)

Making a valid election is straightforward in principle but unforgiving in execution. The choice must be made expressly in a declaration in the form of a disposition of property upon death, in practice, a clause in a will, or demonstrated by the terms of that disposition. The steps are:

1. Confirm eligibility. Verify the nationality (or nationalities) you can choose from at the date of the election.
2. Assess the target law. Analyse the succession and forced-heirship rules of the chosen national law and confirm they deliver your objectives.
3. Draft an express clause. Include an unambiguous choice-of-law clause in a validly executed will.
4. Check formal validity. Ensure the will satisfies formal validity requirements so the election is not defeated on a technicality.
5. Coordinate with tax and structures. Model the tax outcome separately, the election does not change tax liability.
6. Register the will. Use notarial registration (via the Central Register of Wills) so the will is found and given effect.

A sample clause appears later in this article, clearly labelled as illustrative only.

Cross-border conflict scenarios, consequences for key pairings

Abstract rules become concrete when applied to real family situations. The three pairings below are the most common in Belgian cross-border practice. Each turns on the same three questions: which law governs, what happens to forced heirship, and what is the tax exposure.

Belgium–France

France, like Belgium, is a civil-law jurisdiction with its own reserved-heirship tradition, so a family straddling the two borders often finds forced heirship on both sides. Both states apply the EU Succession Regulation, which means habitual residence determines the default governing law and a nationality election is available to nationals of either country. Where a French national is habitually resident in Belgium, electing French law will not deliver escape from forced heirship, because France also protects reserved heirs. The planning value of an election here is coordination and predictability rather than liberation from the reserve, and immovable property in each country carries its own local tax exposure regardless of the governing succession law.

Belgium–Netherlands

The Netherlands operates within the EU Succession Regulation and has succession rules that, while retaining protections for children, are generally more flexible in operation than Belgium’s, particularly through mechanisms that favour the surviving spouse. A Dutch national habitually resident in Belgium can elect Dutch law to govern the whole succession, which may better serve a plan that prioritises the surviving spouse. As always, Belgian inheritance tax on Belgian-situated assets and on Belgian-resident estates remains in play irrespective of the chosen law, so the election addresses the substantive distribution, not the tax bill.

Belgium–UK and post-Brexit notes

The United Kingdom did not participate in the EU Succession Regulation even before Brexit, and it remains outside it. Nevertheless, the Regulation is of universal application in participating states such as Belgium, meaning a Belgian court will apply it to a UK national’s estate. A UK national habitually resident in Belgium can therefore elect the law of England and Wales (or Scotland or Northern Ireland as applicable), a system with broad testamentary freedom and no forced heirship in the Belgian sense. This is often the most consequential election available, because it can lawfully displace Belgian reserved-share rules for that person’s estate, subject always to the public-policy caveat and to separate UK and Belgian tax analysis.

Post-Brexit, cross-border enforcement and recognition require extra care, since the reciprocal EU framework no longer binds the UK.

Inheritance tax and reporting, resident versus non-resident heirs

Inheritance tax in Belgium is a regional matter, and this is one of the most misunderstood features of the system for international families. The three regions, Flanders, Wallonia and the Brussels-Capital Region, each set their own rates, brackets and reliefs. The applicable region generally depends on where the deceased had their fiscal residence for the longest period during the five years before death. Because the regimes differ materially, the same estate can produce very different tax outcomes depending on residence. All rates, brackets and reliefs should be confirmed with the Federal Public Service Finance (which administers the tax) and the relevant regional tax authority (in Flanders, the Flemish Tax Service), current as at the date of planning.

Regional tax regimes and their effect

Each regional regime applies progressive rates that rise steeply for more distant relatives and unrelated beneficiaries, while spouses, legal cohabitants and direct-line descendants benefit from lower brackets and specific reliefs. The regional dimension means that a change of residence within Belgium can change the tax result, and it means advisers must identify the correct region before quoting any figure. Crucially, electing a foreign law under the EU Succession Regulation does not change which region taxes the estate or the rate applied, tax and governing law are separate questions.

Tax on foreign assets held by a Belgian resident

Where the deceased was a Belgian resident, Belgian inheritance tax generally reaches worldwide assets, including foreign real estate and foreign bank accounts, subject to relief mechanisms for foreign inheritance tax already paid on foreign immovable property. For a non-resident deceased, only the estate-of-a-non-resident duty (droit de mutation par décès) applies, generally limited to Belgian immovable property. This resident/non-resident distinction is central to structuring, because it determines the tax base long before any distribution question arises.

Tax exemptions and reliefs for family businesses and trusts

All three regions offer reliefs designed to preserve family enterprises, allowing qualifying business assets and shares to pass at reduced or preferential rates provided continuity conditions are met. These reliefs are conditional and technical, and they can be lost if the conditions are breached. Trusts, which are not native to Belgian civil law, are treated with particular scrutiny and may fall within the “look-through” (Cayman tax) transparency regime and general anti-abuse provisions; their tax treatment for Belgian-connected founders and beneficiaries requires specialist analysis. High-level awareness is not enough here, the detail is decisive, and it should be confirmed with FPS Finance, the relevant regional authority and specialist counsel.

Practical checklist, 10 immediate steps for cross-border families and advisers

1. Audit registries and assets. Map every asset by location and legal nature, and confirm what is registered where.
2. Review existing wills. Check whether current wills reflect the reformed rules and whether they contain a valid choice-of-law clause.
3. Consider an elective law. Assess whether a nationality election under the EU Succession Regulation improves your outcome.
4. Update notarial wills. Where an election or restructuring is warranted, execute or re-execute wills with proper formalities.
5. Obtain tax projections. Model regional inheritance tax for the likely region of residence, for both resident and non-resident scenarios.
6. Review trustee and structure arrangements. Test any trust or holding structure against Belgian tax transparency and anti-abuse rules.
7. Consider pre-death restructuring. Evaluate lifetime gifts, matrimonial regime adjustments and business-relief eligibility, with clawback rules in mind.
8. Align life insurance. Ensure beneficiary designations are coordinated with the will and do not inadvertently breach reserved-share expectations.
9. Appoint executors. Name executors capable of administering a cross-border estate and understanding foreign-law recognition.
10. Build a communication plan. Prepare heirs for the intended distribution to reduce the risk of forced-heirship disputes.

Sequence these steps by urgency: the asset audit and will review come first, followed by the election decision and tax modelling, then execution and communication. Assign each to a responsible adviser, private client lawyer, tax adviser, notary, with a target date.

Comparison table, choosing Belgian law versus foreign law

The following table sets out the decision squarely. It compares the consequences of leaving Belgian law to apply by default against making an express election of a foreign law under the EU Succession Regulation.

How to instruct advisers, sample will clause and practical wording

An election of governing law lives or dies by its drafting and by the formal validity of the will that carries it. The safest route for cross-border clients is a notarial (authentic) will prepared and registered by a Belgian notary, because it minimises the risk of the will being lost, contested on formality grounds, or found not to satisfy execution requirements. A holographic (handwritten) will is permitted but carries higher risk for complex international estates and is harder to prove.

The following is a sample and illustration only, it is not legal advice and must not be used without professional drafting:

“I declare that, pursuant to Regulation (EU) No 650/2012, I choose the law of [country of nationality] to govern the whole of my succession, being a state of which I am a national at the date of this disposition.”

When instructing advisers, provide a full asset schedule, details of all nationalities and periods of residence, existing wills in every jurisdiction, and your objectives for each heir. Ask counsel to confirm the reserved-share position under both Belgian law and the elected law, to model the regional inheritance tax outcome, and to coordinate the will with life insurance and any corporate or trust structures.

Conclusion and recommended next steps

The interaction of forced heirship, the EU Succession Regulation and regional inheritance tax makes deliberate planning valuable for anyone with a Belgian connection, and it penalises inertia. For most cross-border high-net-worth families, our recommendation is clear: audit your assets, review your wills against the current rules, and decide consciously whether to elect a foreign law rather than allowing Belgian succession law to apply by default. Where you need flexibility and have the nationality to support it, an express election, properly drafted, formally valid and tax-modelled, is often the stronger course; where certainty and family protection matter most and your life is anchored in Belgium, the domestic default is sound.

Whichever path fits, confirm every figure and formality against the primary sources and take professional advice before executing changes. To take the next step, contact a Global Law Experts Belgian private client lawyer to review your arrangements and, where needed, to update your will and structures.

Sources

1. EUR-Lex, Regulation (EU) No 650/2012 (EU Succession Regulation)
2. Belgian Federal Public Service, Justice
3. Belgian Official Gazette (Moniteur belge / Belgisch Staatsblad)
4. Federal Public Service Finance (Belgium)
5. Fednot, Belgian Federation of Notaries
6. Flemish Tax Service (Vlaamse Belastingdienst)
7. Constitutional Court of Belgium