For owners, value, legal rights and timing can matter as much as the bank balance.
A property owner opens the annual tax papers and sees an uncomfortable mismatch. The value of a second home has risen, but no property was sold and no money arrived. The bank balance looks much the same. Box 3 may still record a return.
That is the practical force of the actual-return calculation. The Belastingdienst includes income from assets and changes in their value during the calendar year. Its examples include a second home. An unrealised increase can therefore matter before the owner receives cash from a sale.
This reaches beyond private investment planning. Many Dutch founders and owner-managers keep a tidy company ledger beside a less orderly private balance sheet. Property, savings, family loans, bare ownership, usufruct and money passing through a notary can sit together without a clear annual record. Box 3 brings that weakness into view.
Value and liquidity are different facts
The immediate pressure is liquidity. A higher property value may improve personal wealth on paper, yet it does not pay an assessment. An owner can be wealthier for tax purposes without having more money for household bills, business investment or a tax reserve.
The actual-return calculation covers the taxpayer's full Box 3 position. Income, gains and losses belong in one annual calculation. The owner cannot select only the favourable result from one asset and leave the rest aside.
For 2026, the provisional calculation uses 1.28% for bank deposits and 6.00% for investments and other assets. The Box 3 tax rate is 36%. When actual return is lower than the provisional notional return, the income-tax return can lead to an adjustment.
Personal use also matters. From 2026, using a second home or other immovable property can add to actual return. The owner may therefore face a tax calculation involving both a change in value and the property's personal use, without receiving rent or sale proceeds.
The distinction worth keeping firmly in view is simple. Value is not liquidity, but both belong in financial planning. Waiting for the assessment is a poor moment to discover that a paper gain has joined the tax picture.
The bank statement tells only part of the story
A transaction near 1 January brings a different problem. The owner may focus on when sale proceeds reached the personal bank account. Tax classification can turn instead on the legal right held at the reference date.
Dutch property delivery takes place through a notarial deed and registration in the public registers. Once legal transfer takes effect, the private balance sheet may move from property to a claim connected with the sale price. The precise position follows the deed, settlement, registration, contractual rights and tax year.
Notarial money requires similar care. For the 2026 calculation, money on a notary's or bailiff's third-party account falls within the bank-deposit category. The applicable treatment depends on the tax year. Under the transitional rules, the treatment of a taxpayer's claim concerning money on a notary's third-party account also changed with retroactive effect from 1 January 2023.
That makes the tax year part of the answer. A bank deposit, a claim against a buyer and a claim connected with a notarial account may all describe money in transit. They remain different legal categories.
Thirty years around Dutch administration has taught me to distrust the sentence, “The money was not in my account yet.” It may be commercially understandable and fiscally incomplete.
Private wealth needs company-level discipline
Bare ownership and usufruct add another layer. They can form part of the Box 3 position, depending on the right held and the applicable rules. Some specific exceptions apply, including certain inherited bare-ownership arrangements involving a surviving parent's principal residence.
A family may view bare ownership as a future inheritance matter. The tax return may require a present value and an explanation of how that value moved. The same discipline applies to private claims and loans. For a founder or DGA, these rights can sit close to the business without belonging to the BV.
A clean company administration does not settle the private tax position by itself. Mixing the two makes ownership, valuation and cash planning harder to manage. The owner needs a dated private balance-sheet file alongside the company records.
The Belastingdienst uses opening and closing values, purchases, disposals and income in its actual-return examples. That calls for dated deeds, settlement statements, bank records and valuation support. Kadaster information can also help explain a change in ownership or registration.
The question is direct: what right do we actually hold on the decisive date, and what cash, tax and governance result can that right produce?
That question belongs at the kitchen table and in the boardroom. Private tax pressure can affect dividends, owner withdrawals, business investment and family decisions. It can also reveal whether the owner has kept enough distance between company money and personal wealth.
The work starts now
The government is working towards a new Box 3 system based on actual return. The intended 2028 start date remains under review, and a delay is being assessed. That timing does not change the immediate task for owners.
The transitional years already require an understanding of categories, dates, annual movements and legal rights. Records created now may answer both today's tax question and tomorrow's.
Return to the owner with the second home. The useful response is not alarm about a gain that exists only on paper. It is a calm reconstruction of the year: opening value, closing value, use, income, debt, transactions and supporting documents. Then comes the cash question.
Box 3 asks property owners to see private wealth as a balance sheet rather than a collection of bank accounts. The discipline is familiar. Know what you own, know when you owned it, understand how its value changed, and keep enough liquidity for the consequences.
If property values, legal rights or funds in transit affect your Box 3 position, review the dates, documents and liquidity consequences before filing.
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
- Ongerealiseerde waardestijging woning telt mee in box 3 - Taxence
- Belastingdienst - Unrealised value growth in Box 3 actual return
- Belastingdienst - Bare ownership, claims and other Box 3 assets
- Kennisgroepen Belastingdienst - Notarial third-party accounts and asset classification
- Belastingdienst - Current 2026 transitional Box 3 calculation
- Belastingdienst - Actual-return proof and whole-portfolio test
- Rijksoverheid - Later Box 3 reform and continuing uncertainty
- Wettenbank
