Smaller Mailbox Sector, Harder Questions for Dutch Company Directors

Fewer structures remain, but ownership, payments and service roles must still tell one credible story.

A founder sits down with an adviser to discuss a new investor. The Dutch BV is profitable, the shareholder register is tidy and the UBO registration was completed years ago. Then the practical questions begin. Who can operate the foreign bank account? Why does another company receive the management fee? Who handles the post, the bookkeeping and the annual accounts?

De Nederlandsche Bank has put fresh weight behind those questions. In June 2026, DNB reported investigations into ten businesses for possible splitting of trust services to avoid licensing rules. It found such splitting at three businesses, while four investigations remained open when DNB published its notice.

The issue reaches beyond the familiar image of a mailbox company. It concerns the line between ordinary company support and regulated trust services. DNB identified combinations involving a correspondence address, record keeping and annual-account preparation. Each task may look routine alone. Together, the working relationship can carry a different meaning.

The structure is smaller, not irrelevant

The Dutch flow-through sector has contracted. DNB reports that financial holdings of multinational groups fell from more than 14,000 in 2017 to fewer than 8,000 in 2025. Active trust offices also declined, from around 200 in 2017 to just over 100 in 2025.

CBS describes the same broad movement. Dutch special-purpose entity activity has fallen relative to GDP since 2018. Multinational groups have dismantled some structures and rerouted interest and dividend flows. In 2024, some routes declined while activity involving other regions increased slightly.

DNB still describes the Netherlands as Europe’s second-largest flow-through sector after Luxembourg. The business picture is one of contraction, restructuring and concentration. Fewer entities and providers can still carry substantial cross-border ownership, financing and payment relationships.

For a small company, the useful question is not whether it resembles a multinational tax structure. It is whether the company can explain its Dutch presence, ownership, decision-making and money flows without relying on one person’s memory.

A chart is only the beginning

The founder at the table may believe the UBO registration settles the ownership question. It records an important part of the picture. Governance also depends on who exercises control in practice and how that control appears in agreements, accounts and daily decisions.

For a Dutch BV, NV, SE or SCE, an individual with more than 25 per cent of shares, voting rights or economic interest generally qualifies as a UBO. KVK also recognises factual control as a route to UBO status. Voting arrangements and sustained practical influence can matter as much as a formal percentage.

That distinction reaches ordinary company life. A family member may shape every strategic decision. An investor may hold special rights through a shareholders’ agreement. A lender may gain influence through financing conditions. The legal percentages may remain unchanged while practical control moves elsewhere.

DNB’s 2026 supervisory findings underline the value of a complete working file. At supervised trust offices, DNB found recurring weaknesses in evidence on source of wealth, ownership structures, integrity risks and transaction monitoring. The wider governance lesson is simple. The chart, contracts, ledger and actual conduct should support the same explanation.

Service roles deserve a closer look

The delicate point may sit outside the company itself. An address provider receives the post. A bookkeeper maintains the records. Another firm prepares the annual accounts. A consultant coordinates the relationship with the foreign shareholder.

Separate invoices do not automatically create separate responsibility. The operational reality matters: who accepts the client, who holds the information, who maintains contact and who directs the relationship. Service labels and invoice lines are useful, but they cannot carry the whole analysis.

The Wet toezicht trustkantoren 2018 has applied since 1 January 2019. It governs the organisation and operation of trust offices, client due diligence, and the suitability and reliability of policymakers. Providing trust services in or into the Netherlands without the required DNB licence is prohibited.

A careful provider therefore needs to understand the full arrangement around the client, not only its own contract paragraph. For directors, the same discipline clarifies who owns the next action when information changes. Blurred handovers become costly when a bank, buyer or regulator needs a prompt answer.

Small delays create real cash pressure

The first consequence of weak governance is usually friction. A bank pauses onboarding. An investor requests further ownership evidence. A buyer cannot reconcile signing authority with the corporate records. A refinancing waits while old transfers, loans and payment routes are rebuilt from emails and bank statements.

That reconstruction is particularly expensive in a small business. Knowledge may sit with a founder, former director or external bookkeeper. When that person is unavailable, the company can lose days finding documents, matching invoices to contracts and explaining why money moved through a particular account.

A useful review starts with consistency. The shareholder register, UBO registration, director details and current agreements should reflect the same ownership and control picture. KVK requires UBO changes and deregistrations to be reported within seven days after they take effect. Waiting for an annual tidy-up can leave the record behind the business.

Bank accounts and payment providers deserve equal attention. The company should know which accounts exist, who can operate them and why money follows each route. A foreign account or intercompany payment can be commercially sound. It needs to fit the ledger, contracts and stated business purpose.

The founder at the table does not need a dramatic compliance project. The company needs a current account of who owns it, who directs it, why it exists in the Netherlands and how its money moves. External providers should describe their respective roles with the same clarity.

European anti-money-laundering measures are expected to take effect around mid-2027. The immediate pressure is already visible in DNB’s work on licensing boundaries, client records and transaction monitoring.

Good governance here does not mean making a legitimate structure look simple. It means making the real structure understandable. When ownership, authority, services and payments tell one coherent story, serious questions become easier to answer. That is not administrative decoration. It is basic control over the company itself.

The data, sourcing, and analysis behind this article were conducted by Paolo Maria Pavan. AI was not used to identify sources, build the factual basis, or produce the analytical judgment contained here. AI was used only as a drafting aid. The final English text was personally reviewed, edited, and approved by Paolo Maria Pavan before publication.

References

• Kabinet scherpt toezicht op brievenbusfirma’s verder aan - Taxence
• De Nederlandsche Bank - Trust-office supervision and the statutory gatekeeper role
• De Nederlandsche Bank - Illegal splitting of trust services
• De Nederlandsche Bank - Current supervisory findings: evidence quality, bank access and transaction monitoring
• De Nederlandsche Bank - Sector contraction and continued flow-through relevance
• Centraal Bureau voor de Statistiek - Actual 2024 flow-through data and tax-policy context
• Kamer van Koophandel - UBO threshold, factual control and updating the register
• Kamer van Koophandel - Timeliness of UBO records