Netherlands Box 3 Reform 2028: What the Actual-Returns Tax Change Means

This article is a factual explainer of a domestic Dutch tax-policy development. It does not recommend any course of action, and it does not suggest that changing residence or acquiring another citizenship is a response to a tax change. Its purpose is to describe what the Netherlands Box 3 reform proposes, where it stands, and which established rules remain relevant, so that readers can understand the topic and, where appropriate, raise informed questions with a qualified adviser.

What is the Netherlands Box 3 reform?

The Netherlands Box 3 reform is a proposed change to how the Dutch tax system treats personal savings and investments, replacing a deemed, or assumed, return with tax on the actual return a portfolio generates. Box 3 is the third of the three categories in Dutch personal income tax and covers assets such as savings, shares, funds, bonds and cryptocurrency held outside a business structure. Under the current system, the tax is calculated on a fixed assumed percentage of the value of those assets, regardless of how they actually performed in the year.

The reform passed by the House of Representatives on 12 February 2026 would tax the actual returns on those assets. Notably, the proposal covers unrealised gains, meaning increases in the paper value of an asset over the year, not only gains that are crystallised when an asset is sold. Loss relief provisions are part of the design. The detailed rules for particular asset classes, including how investment property is treated, are being settled through the legislative process, and the final text is what will govern once, and if, the measure is enacted.

Why is the Netherlands changing the Box 3 system?

The Netherlands is changing Box 3 because the earlier deemed-return method was found to be legally unsustainable and required replacement. The Dutch Supreme Court held that taxing a fictitious assumed return could conflict with the protection of property where a taxpayer's real return was lower than the assumed figure. That ruling prompted successive governments to design a system based on actual returns, which is the approach reflected in the measure passed in February 2026.

The reform is therefore best understood as a structural correction to a system the courts had questioned, rather than a sudden or isolated event. Official information on the legislative status is published by the Dutch government, and the tax authority, the Belastingdienst, publishes guidance on how Box 3 is applied in practice as rules are confirmed.

Has the Box 3 reform been finalised?

No. As of the date of this article, the Box 3 reform has passed the House of Representatives but remains subject to approval by the Senate (Eerste Kamer), and it is therefore not yet law. The proposed effective date is 1 January 2028. Because the Senate review is still open, both the timing and elements of the final design could change before enactment, and readers should treat the specifics as provisional until the legislation is confirmed. For any personal assessment, the position should be checked against the enacted text and against current guidance from the Belastingdienst.

Who does Box 3 apply to?

Box 3 applies to Dutch tax residents in respect of their personal savings and investments held outside a business, and the reform would change how the tax on those assets is calculated rather than who falls within the category. Individuals whose wealth is concentrated in liquid, growth-oriented portfolios would see the largest difference between a deemed-return calculation and an actual-return calculation, simply because their real returns and their assumed returns can diverge significantly. Whether a person is within scope depends on Dutch tax residence and on the nature of their holdings.

It is important to separate Box 3 from Box 2, which governs substantial interests, generally a shareholding of five percent or more in a company. Business owners often hold assets through such structures, and those are taxed under different rules. Anyone unsure which category applies to a given asset should seek qualified Dutch tax advice rather than infer treatment from general summaries.

How do existing Dutch and international rules still apply?

Existing Dutch residence rules, the Box 2 exit tax on substantial interests, and international information exchange all continue to apply on their own terms, independently of the Box 3 reform and independently of a person's citizenship. These are long-standing features of the system, and they are relevant context for understanding the reform rather than consequences of it.

• Tax residence is determined by facts, not passport. Dutch tax residence turns on where a person actually lives and maintains their centre of life, assessed under Dutch law and applicable tax treaties. Holding an additional citizenship does not, by itself, change where someone is tax resident.
• The Box 2 substantial-interest exit tax is a separate, existing rule. Dutch law already provides that individuals with a substantial interest (broadly five percent or more of a company) can face an assessment on unrealised gains when they cease to be Dutch tax resident. This is distinct from Box 3 and predates the reform. Its application depends on individual circumstances and destination, and it requires specialist advice.
• International reporting continues under the Common Reporting Standard. Financial account information is exchanged automatically between participating jurisdictions under the OECD's Common Reporting Standard. This reporting is based on tax residence and account holdings and is not altered by holding another nationality.

In short, the reform changes one calculation within a wider framework that continues to operate. Understanding that framework helps prevent the common misconception that citizenship changes a person's tax position; in general, it does not.

Where can readers learn more about the wider landscape?

Readers who want to understand the broader field of investment migration, purely as background, can consult neutral overview resources. Mirabello Consultancy maintains explainer hubs on residency by investment programmes and citizenship by investment programmes, and country explainers such as the Portugal Golden Visa, the Greece Golden Visa and the United Arab Emirates Golden Visa. These pages describe how each programme works. They are informational and are not a suggestion that anyone should relocate in response to a tax change; any residence or citizenship decision is a significant, personal matter that should follow independent tax and legal advice.

What should someone affected by the reform do?

Anyone who thinks the Box 3 reform may affect them should obtain advice from a qualified Dutch tax adviser based on the enacted legislation and their own circumstances. Because the measure is still subject to Senate approval, the prudent step is to follow the legislative process through official channels and to avoid acting on provisional figures. A qualified adviser can explain how the actual-return method would apply to a specific portfolio, how Box 2 and other rules interact, and what, if anything, is relevant to a person's situation.

Mirabello Consultancy provides information on residence and citizenship programmes and can help clients understand the general landscape. We do not provide Dutch tax advice, and we do not suggest emigration as a response to a domestic tax change. If, after taking independent tax and legal advice, you are separately exploring international residence options for your own reasons, you are welcome to contact Mirabello Consultancy for a free consultation to understand how specific programmes work.

Frequently asked questions

Is the Netherlands Box 3 reform already law?

No. The reform passed the House of Representatives (Tweede Kamer) on 12 February 2026 but remains subject to approval by the Senate (Eerste Kamer), so it is not yet law. The proposed effective date is 1 January 2028. Both the timing and the final detail could change during Senate review, and the enacted text and Belastingdienst guidance are the authoritative sources once available.

What exactly would the reform tax?

The reform would tax the actual returns on Box 3 assets, which are personal savings and investments held outside a business, such as shares, funds, bonds and cryptocurrency. The proposal includes unrealised gains, meaning increases in an asset's value over the year even if it has not been sold, and it contains loss-relief provisions. The precise treatment of specific asset classes is being finalised through the legislative process.

Does another citizenship change how Dutch tax applies?

Generally, no. Dutch tax residence is determined by where a person actually lives and maintains their centre of life, assessed under Dutch law and tax treaties, not by which passport they hold. Existing rules, including any Box 2 substantial-interest exit tax and reporting under the OECD Common Reporting Standard, apply based on residence and holdings regardless of citizenship. Individual positions should be confirmed with qualified Dutch tax counsel.

Where can I find official information on the reform?

Official information is available from the Dutch government and from the Dutch tax authority, the Belastingdienst, which publishes practical guidance on Box 3 as rules are confirmed. Because the measure is still moving through the legislative process, checking these official sources for the current status is the most reliable approach, and any personal decision should be based on advice from a qualified Dutch tax adviser.