The tax may move closer to the sale, but founders still need clear records and separate cash plans.
A founder opens a private investment account after a difficult quarter. The balance is healthy enough to offer comfort. It could support the household, finance a later capital injection or reduce the need for a dividend from the BV. Yet part of that comfort depends on what Box 3 will ask, and when.
The cabinet has announced that it wants to move Box 3 towards taxation of capital gains. That would bring the taxable moment closer to the sale of an asset for more investments. It is an important political direction. The current rules still govern that account.
The Netherlands is working towards a new actual-return system from 1 January 2028. The bill adopted by the Tweede Kamer in February 2026 remains a mixed model. It generally taxes annual value movements, while using capital-gains treatment for specified assets, including real estate and qualifying startup and scale-up shares. Further political and legislative work will determine whether disposal-based taxation becomes much broader.
Timing changes the pressure
The distinction sounds technical until private wealth supports a real business decision.
Under annual value-growth taxation, an investment can create taxable return before it produces sale proceeds. The owner may have gained on paper while receiving no cash. That is uncomfortable when the same household is paying a mortgage, supporting children, carrying private debt or helping a company through slower sales.
A capital-gains model can align tax more closely with realised liquidity. Sell the asset, realise the gain, then face the tax consequence. I understand why that has political and practical appeal. It is easier to explain and can feel fairer when investments are volatile or difficult to sell.
Delayed taxation is not the same as lighter taxation. It is not free liquidity either. The pressure moves from annual valuation towards purchase history, acquisition costs, corporate actions and disposal records. A tax event may arrive later, but the calculation can depend on information created years earlier.
That is where administration stops being clerical. If an investment account changes provider, securities are transferred, shares split or assets pass between family members, the original cost and ownership history must survive those events. A broker statement showing today’s balance may not explain tomorrow’s taxable gain.
The present system still governs today
For 2026, Box 3 remains under the transitional framework. The provisional assessment uses fictitious returns because the year’s actual return is not yet known. The Belastingdienst uses 1.28 per cent for bank deposits, 6.00 per cent for investments and other assets, and 2.70 per cent for Box 3 debts in that provisional calculation.
Where properly reported actual return is lower, the later income-tax return can produce an adjustment. That comparison covers the taxpayer’s full Box 3 estate. Interest, dividends and realised and unrealised value movements can all matter. A negative total actual return is set at zero and cannot be carried into another year.
The founder looking at that investment account therefore has three different time frames on the table. There is the provisional 2026 payment calendar. There is the later actual-return comparison. Then there is the political plan for a different system from 2028.
Mixing those time frames is an easy way to spend the same money twice. A possible future reform cannot fund today’s machinery purchase. An expected tax adjustment should not support a dividend decision before the assessment is clear. An unrealised gain should not quietly become part of the company’s emergency reserve.
Two balance sheets, one owner
Many Dutch owner-managers live with two connected financial worlds. The BV has wages, VAT, creditors, loans and customer receipts. The household has savings, investments, property, private debts and income tax. The legal separation is clear. Daily life often makes it feel less so.
When a customer pays late, private savings may support the owner. When the household needs cash, the owner may consider a dividend or shareholder loan. Personal guarantees can connect both sides even more tightly. Box 3 sits in the private world, but its cash consequences can change decisions inside the company.
My unavoidable question is this: what are we accepting or postponing today, and what result will that produce for household cash, company funding, tax compliance and management freedom?
A useful answer starts with visible separation. Ownership should be clear. The records should show whether an asset belongs privately, to the BV or to an income-tax business. Private tax payments belong in the household forecast, even when company decisions may eventually fund them. Planned dividends, capital injections and shareholder lending deserve their own assumptions.
This is not a call for elaborate administration. For a small portfolio, disciplined preservation of annual statements, transaction confirmations and acquisition information may be enough. Property, crypto-assets, options, family arrangements and older investment histories can require more attention. Complexity should follow the assets, not the owner’s anxiety.
Keep policy hopes out of available cash
The founder returns to the account and sees the same balance. What has changed is the meaning of that number. Some of it may be available. Some may carry a future tax consequence. Some may be difficult to sell at the right moment. None of it belongs automatically to the business.
The Box 3 debate is moving towards a system that may match tax and sale proceeds more closely. That could improve liquidity timing for many investors. Parliament still has to settle the legal design, and the current rules continue meanwhile.
The calm response is to keep private wealth visible, preserve the history behind each asset and let the company stand on its own cash forecast. Tax timing may change. Sound ownership, records and judgment will remain necessary.
If Box 3 affects the choices between private wealth and company funding, we can bring the timing, records and cash assumptions into one clear view.
The data, sourcing, and analysis behind this article were conducted by Linda Pavan Geraedts. 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 Linda Pavan Geraedts before publication.
References
- Kabinet kiest in box 3 grotendeels voor vermogenswinstbelasting - Taxence
- Rijksoverheid - Status and design of the proposed 2028 box 3 regime
- Overheid.nl Wetgevingskalender - Legislative stage and the 2028 date
- Belastingdienst - Current box 3 position before any new regime
- Belastingdienst - 2026 cash exposure under the transitional system
- Rijksoverheid - Existing relief, procedural finality and historical box 3 files
- Rijksoverheid - Implementation capacity and the importance of data systems
- Rijksoverheid - Speech by Minister Heinen at the presentation of the 2027 Budget Memorandum
