Belastingdienst has made zero-coupon bonds a yearly value question, not a coupon question.
The owner’s quiet bond
A founder may buy a zero-coupon bond for a simple reason. No monthly noise, no dividend mood, no coupon to spend too early. The bond sits as a private reserve beside the company, bought at a discount and redeemed later at nominal value. That makes Dutch Box 3 control a records problem, not only a private tax calculation.
On 5 June 2026, the Belastingdienst Kennisgroep Inkomstenbelasting niet-winst published position KG:202:2026:9 on zero-coupon bonds and Box 3. Under the box 3 counterproof regime, the actual return on a zerobond consists of capital accretion only. Belastingdienst treats it as value growth, not regular interest.
Private wealth now needs a record
That changes the tax work behind the return. The instrument may be quiet in cash terms, yet it still needs a yearly value line. For the owner, the question moves from what was paid out to what changed in value.
How the value is read
A zero-coupon bond is plain in shape. It pays no interest during its term. Issuers usually sell it below nominal value and redeem it at nominal value. Economically, that discount can look like deferred interest. For Box 3, Belastingdienst keeps a different line: no factual interest payment, so no regular benefit for this purpose.
The yearly value change carries the tax weight. If the bond is listed, the quoted market price matters at the start and end of the year. If there is no listed price, fair market value has to be built from indicators such as issue value, term, market interest and nominal value.
Purchase, sale and redemption also matter. Belastingdienst treats a purchase as a deposit and a sale or redemption as a withdrawal. In a sale or redemption year, the actual return runs only from 1 January up to the sale or redemption date.
Market rates still move the bond
This is where tax language meets the market. DNB explains that long-term interest rates, including bond rates, follow expectations about central bank policy, inflation, growth, term and risk. A zerobond can rise or fall in value while paying nothing in cash. Silence in the bank account is not silence in Box 3.
Timing is part of the tax story
The counterproof regime exists because Box 3 now leans closer to actual return. The Wet tegenbewijsregeling box 3 entered into force on 19 July 2025. Belastingdienst defines actual return as real income from wealth, including value changes, calculated over the taxpayer’s total Box 3 wealth within one calendar year.
That whole-position rule matters. The zerobond is never judged alone. Cash, securities, debts, receivables, crypto and a second home can sit in the same calculation. Gains and losses within the year can offset each other. If total actual return is negative, Belastingdienst sets it at zero. The negative amount does not carry forward.
Cash now, correction later
The provisional assessment creates a timing gap. For 2026, Belastingdienst does not use actual return in the provisional Box 3 calculation because actual return becomes known only after the year ends. Bonds fall under investments and other assets, where the provisional percentage is 6.00 percent.
A lower actual return can later be corrected through the income tax return. Later, though, is not the same as cash today. For a small business owner, private Box 3 cash can be the money set aside for a quieter summer, a delayed dividend, a shareholder loan or a family mortgage payment.
Kennisgroep positions and the file
Published Kennisgroep positions form Belastingdienst policy and bind inspectors and receivers. Advisers get a clear view of the administration’s working position. The position still reads like a tax rule, not a personal valuation report for every bond in every portfolio.
Back at the founder’s desk, the bond is still silent. Nothing has landed in the bank. Yet the private tax file may need the start value, end value, purchase date, maturity terms and a sound explanation of how the value was reached.
What founders should separate
If the instrument is unlisted, the work becomes more technical. If the provisional assessment is high, the correction may take time. Belastingdienst says it may receive around 10 million Opgaaf werkelijk rendement forms, and some messages may run into 2030. Cash effect and tax calculation can sit far apart.
What the file should show
The practical discipline is modest. I would want the private Box 3 record to show what was bought, when it was bought, the issue price, nominal value, maturity date, ISIN if available, redemption terms, start and end values, and any sale or redemption date. Unlisted instruments deserve extra care in the valuation method.
The heffingsvrij vermogen can also mislead intuition. For 2026, the threshold is €59,357 without a fiscal partner and €118,714 with one. Belastingdienst does not apply that allowance inside the actual-return calculation. The counterproof calculation looks at actual return across the full Box 3 position.
None of this makes zero-coupon bonds bad. That is the wrong conclusion. The better one is quieter and more useful: a bond chosen for calm can still require annual evidence. The owner who reads only the cash receipt will miss the tax movement. The adviser who reads only the product will miss the family liquidity question.
The direction of travel
Box 3 keeps moving toward more actual-return logic. The proposed Wet werkelijk rendement box 3 is intended to enter into force on 1 January 2028. The Tweede Kamer adopted the bill on 12 February 2026. The file is now in the Eerste Kamer phase, and the Wetgevingskalender records a Nota naar aanleiding van het verslag dated 24 April 2026.
The government also closed the accrued-interest bond leak in Box 3. Rijksoverheid estimated the leak at about €100 million in 2025. The repair applies from 2026 with retroactive effect to 25 August 2025 at 16:00, and it concerns the counterproof regime, not the notional Box 3 calculation.
The zerobond position shows the daily version of that direction. More dates. More values. More proof. For small business owners, that is not a reason for panic. It is a reason to keep private wealth records as carefully as the money may one day be needed.
Sources
- Standpunt zerobonds en box 3 – Taxence
- Belastingdienst Kennisgroepen – Zerobonds under the Box 3 counterproof regime
- Belastingdienst Kennisgroepen – Status of Kennisgroep positions
- Rijksoverheid – Legal recovery and counterproof route
- Belastingdienst – General actual-return calculation
- Belastingdienst – 2026 Box 3 provisional rates and asset category
- Belastingdienst – Heffingsvrij vermogen and actual return
- Belastingdienst – Opgaaf werkelijk rendement processing pressure
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