The 2028 reform is still moving, while 2026 cash and evidence already matter.
On a Tuesday afternoon, a founder can have the BV ledger open on one screen. On the table lies the private balance sheet: savings, investments, a family loan, a second home, founder shares. The company may be tidy. The owner’s private tax file may still be messy. That makes Dutch box 3 unfinished private a records problem, not only a private tax calculation.
Private wealth now needs a record
The government still aims to introduce an actual-return Box 3 system on 1 January 2028. The Tweede Kamer approved the bill on 12 February 2026. The Eerste Kamer still has to handle it. For now, 2026 and 2027 remain bridge years, but they are not idle years.
The private side of the ledger
For many founders, Box 3 sits outside the company accounts yet close to the company’s nerves. Private savings can cover a difficult payroll month. An investment account can sit next to a dividend decision. A second home can be family property, future collateral, or a sale plan.
For 2026 provisional assessments, Belastingdienst still uses bridge-system percentages because actual return is only known after the year ends. The listed 2026 percentages are 1.28 percent for bank balances and 6.00 percent for investments and other assets. The heffingsvrij vermogen remains €59,357 without a fiscal partner and €118,714 with one.
Earlier tightening plans were dropped at the request of the Tweede Kamer. The proposed cut in the heffingsvrij vermogen to €51,396 did not go ahead. The proposed increase in the notional return for other assets to 7.78 percent also fell away. That leaves less pressure than the earlier plan, but the record problem remains.
Since 1 July 2025, taxpayers who paid too much Box 3 tax can request correction if they can show that actual return was lower. Rijksoverheid says the actual return must cover total wealth, not only the disappointing part of a portfolio. That matters. A partial story is not enough when the tax calculation looks at the whole picture.
Three clocks around one owner
Three clocks are running at once. The first is the 2026 and 2027 bridge system. The second is the counterproof and refund route. Belastingdienst says it may receive about 10 million Opgaaf werkelijk rendement forms, and some taxpayers may wait until 2030 for a message.
Timing is part of the tax story
The third clock is the intended 2028 actual-return system. Under the proposal, the new system taxes actual income from assets such as interest, dividends, rent, and lease income. It also taxes value increases through a capital-accrual approach.
Real estate and shares in startups and scale-ups get different treatment in the proposal. For those assets, the system uses a capital-gains method, with tax when the gain or loss is realised. The owner-occupied main home stays in Box 1.
A March 2026 Kamerbrief also matters here. It said the proposal could make actual-return taxation possible from 2028, but the ideal Box 3 system is not yet there. It also recognised concerns about the investment-climate effects of capital-accrual taxation and said improvements were being explored, including one-year backward loss relief from 2029.
Where records meet cash
This matters because value and cash do not arrive together. If a system taxes value growth before sale, an owner can face tax pressure before the asset has produced spendable money. If a refund depends on counterproof and later processing, the opposite problem appears. The owner may have a fair claim and no cash in the bank.
Return to the founder at the kitchen table. The BV ledger may show debtors, wages, and VAT under control. The private sheet asks different questions. Which broker statements are complete? Which dividends arrived in which year? Which costs connect to income? Which debt belongs to which asset?
For a second home, the calendar also matters. From 2026, Belastingdienst says taxpayers who use a second home or other real estate personally must add an amount for own use to actual return. Under the fixed method, the calculation uses 5.06 percent of the WOZ value, multiplied by the number of days the taxpayer can use the property. For 2026, the WOZ valuation date is 1 January 2025.
What founders should separate
Startup shares bring another kind of discipline. Rijksoverheid has described a proposed route where qualifying startup and scale-up shares are taxed under a capital-gains method in the new Box 3 system. If that route is adopted, qualification will depend on an RVO decision. That turns a familiar founder label into a formal status question.
Discipline before certainty
The scale is large. DNB reported Dutch household securities holdings of €204.3 billion at the end of 2025. Households also held €528.6 billion on savings accounts at Dutch banks and €109 billion on current accounts. CBS household wealth data for 2024 also show large amounts in financial assets, other real estate, and business assets. These figures show the size of the field, not the exact tax position of any one owner.
CPB certified the budgetary estimate for the Wet werkelijk rendement box 3 on 19 May 2025 as reasonable and neutral, with a high degree of uncertainty. That is close to how the business table feels. The direction is visible, but the final shape is still moving.
For planning, the safer habit is to treat the private balance sheet with the same care as the company ledger. Bank and broker statements, rent records, cost invoices, loan documents, WOZ values, and transaction dates become part of that discipline. For a second home, a simple day calendar may prove more useful than a long discussion later.
Cash planning needs the same restraint. A possible Box 3 correction is not operating liquidity. It is not stock money, staff money, repayment money, or dividend money. Processing time makes that a cash-flow fact, not a political opinion.
Box 3 is still being shaped before it becomes final law. That makes the coming period uncomfortable, but readable. The owner who keeps clean records now keeps room to decide later. The owner who waits for perfect certainty may still need old evidence when the question finally arrives.
Sources
- Verbetering wetsvoorstel Wet werkelijk rendement box 3 – Taxence
- Rijksoverheid – Current official frame for the 2028 Box 3 reform
- Rijksoverheid – Government process for improving the bill
- Belastingdienst – Current 2026 Box 3 bridge rules and scrapped 2026 tightening
- Belastingdienst – Heffingsvrij vermogen and 2026 Budget Plan correction
- Rijksoverheid – Counterproof and Opgaaf werkelijk rendement
- Belastingdienst – Processing time and refund timing
- Belastingdienst – Own-use real estate in actual-return calculations
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