Prinsjesdag 2026: what is proposed, what can change

Prinsjesdag is a package, not one law. The Miljoenennota explains the fiscal outlook; departmental budgets authorise spending; tax bills change tax law. On September 15 the government published the 2027 documents. The tax package contains four bills: Belastingplan 2027, Overige fiscale maatregelen 2027, fiscal incentives for start-ups and scale-ups, and safe-harbour rules for the minimum tax.

Bill 37.022 has been submitted, but its parliamentary record does not show a completed vote or enactment. Publication and an adopted political motion are different from passage of a bill. The box 3 reform remains a separate dossier, 36.748, already passed by the Lower House in February but not yet approved by the Senate. The newly published box 3 letter is a policy letter, not the promised amending bill.

The cover letter also announces a later nota van wijziging for additional diesel-excise relief, a slower phase-out of petrol/diesel relief, and an earnings-stripping exception for housing corporations. An announced amendment is not part of the original text merely because it appears in a press summary. This review identifies that announcement; it does not certify a subsequently filed amendment.

The September 15 letter from Heinen and Eerenberg confirms that support for both box 3 changes and their funding is too divided to present a broadly supported adjustment. It asks the Senate to hold the bill while discussions continue. This is a request by the cabinet, not proof of a new Senate procedural decision, withdrawal or repeal.

The letter seeks concrete proposals as quickly as possible and budgetary processing at the next budget decision point. It does not commit to a specific spring 2027 deadline. Earlier media reports referred to the Voorjaarsnota; that should no longer be presented as the wording of the official commitment.

The fiscal baseline remains the actual-return law starting January 1, 2028. The letter describes full capital-gains taxation potentially from 2030 under an ambitious legislative timetable. Neither date is guaranteed. Route 4 would extend realisation-based taxation to financial instruments in 2028, covering approximately 90% of assets with value changes, with the remaining assets following in 2030. That is not the same as 90% of all taxpayers or all box 3 income.

The current deemed-return system with counter-evidence and the proposed actual-return law must not be conflated. The letter explains that counter-evidence allows a lower actual return to be demonstrated but does not provide the same expense deduction and loss treatment as the proposed new law. Under the present proposal, ordinary interest, dividends and rents remain taxable annually; taxing capital gains at sale does not make all income tax-free until sale.

The official budget table measures revenue effects against the baseline of the actual-return law in 2028. A minus sign is a deterioration of the budget balance, not a direct payment to investors. The route totals below are cumulative through 2035, in billions of euros. Do not add the mutually exclusive routes together or compare a cumulative transition cost with a single-year figure.

For route 1, €5.723 billion is the listed maximum subtotal of options 1.1–1.7, not a chosen package. The separate keys for a one-percentage-point rate reduction and a €100 higher tax-free result are excluded from that subtotal. Table 1 lists one-year carry-back at €4.379 billion cumulatively through 2035, but only €14 million structurally per year: a clear illustration of why transition and long-run costs differ.

Table 2 is a menu of possible funding, not agreed policy. It includes a 1.78-percentage-point increase in the deemed return, a €10,000 reduction in the tax-free allowance, a one-point box 3 rate increase, changes to paper gifts, a lower excessive-borrowing threshold in box 2 and corporate-tax changes. None of those options should silently become a calculator default. Nor should every option be added together as though the cabinet had selected them all.

Our analysis: the difficult bargain is not simply accrual tax versus capital-gains tax. It is who bears the transitional revenue loss, how much administrative complexity is acceptable, and whether relief for investors can win support alongside the treatment of workers, pensioners and families. A route can be technically possible yet fail to attract support for its funding.

NOS reported on September 17 that the coalition has 66 Lower House seats and that no settled route to a budget majority emerged after the two debate days. With all 150 members voting, 76 votes are needed for a majority: ten more than the coalition alone. That arithmetic is not a forecast; attendance, dissent and the particular proposal matter. The Senate must separately pass legislation and cannot amend a bill itself.

Jetten was still seeking broad support rather than announcing a comprehensive agreement. A broad deal could link tax changes to spending and social policy; separate deals could produce different majorities for different budgets. Neither route guarantees that the tax package, a box 3 reform and every departmental budget will pass unchanged.

The official September 17 voting record already provides concrete evidence of pressure to change the package: motions on child-related benefits, medical deductions and purchasing power were adopted. These are political instructions, not amendments rewriting the law. Conversely, rejection of a motion to stop cuts does not itself enact those cuts. An empty outcome field is not evidence of either adoption or rejection.

Our assessment is therefore qualitative, not a new set of probability percentages. Retaining the medical-expenses deduction and revising child-budget proposals face demonstrated parliamentary pressure; box 3 has no selected cabinet route at all; other tax proposals still need detailed scrutiny and votes. We do not label any unpassed measure as certain or assume that all proposals will fail just because the cabinet is a minority.

The income package illustrates a common headline trap. The proposed 0.06-percentage-point reduction in the first two rates is relative to earlier planned increases, not necessarily a reduction compared with 2026. The official factsheet says the combined changes increase the first rate by 0.48 percentage points and the second by 0.60 points in 2027. The €173 employment-credit increase is at its three kink points, not an unconditional €173 payment to everyone.

The proposed restricted inflation adjustment applies only 48% of the normal 2.6% adjustment in 2027: a factor of 1.01248, with statutory exceptions and separate rules for some thresholds. Freezing the top-rate entry point is another measure. Do not apply one generic percentage to every tax band, allowance or benefit. The explanatory memorandum also discusses effects on box 2 and box 3 amounts: “no chosen box 3 reform” does not mean all related parameters are frozen.

The proposed transfer-tax reduction concerns homes not used as the buyer’s main residence. It is a purchase tax, not an annual box 3 rate. The employee-option proposal for qualifying start-ups is wage/income-tax policy, not a general box 3 exemption for all start-up investors. These distinctions matter when comparing property, shares, salary and business structures.

The table below summarises the measures most relevant to this site, not every provision of every departmental budget. Amounts are the published proposal or explicitly stated existing-policy position. They are not substituted for the calculator’s selected tax-year rules.

The Miljoenennota projects 2027 revenue of €481.2 billion and net expenditure relevant to the EMU balance of €516.8 billion. Including local government, the projected deficit is €36.7 billion, or 2.9% of GDP; projected debt is 46.9% of GDP. These are estimates, not guaranteed outcomes or a discretionary spending pot. Changing a tax measure can require compensating revenue or spending decisions elsewhere.

Median purchasing power is projected to fall 0.1% in 2027; the poverty rate is projected at 2.6%. A median is not an individual forecast: salary, pension, household composition, rent, mortgage, benefits and energy use determine the outcome. Fiscal year-to-year comparisons must include credits and benefits, not just headline rates.

The implementation overview says the income-tax chain is working on retiring Cool:Gen by end-2027 while preparing the actual-return reform, with much implementation work in 2028. Depending on scope and priority, there is room for new policy for tax year 2029, with competing projects. That does not automatically move the legal start date to 2029. Limited parameter changes are a different task from rebuilding a tax system.

Route 4 has a specific warning in the box 3 letter: banks cannot supply prefilled-return data for at least the first year. Taxpayers would carry more responsibility for records and reporting, and enforcement becomes harder. The fastest nominal start date is therefore not necessarily the least risky route for taxpayers or the administration.

The Lower House dossier lists a technical briefing on September 21, a Finance Committee procedural meeting on September 24 and written input on October 1. These are scheduled activities, not votes that have already happened. Watch amendments to 37.022, the response to adopted APB motions, any new box 3 proposal, a Senate decision on 36.748, and ultimately passage, publication and commencement provisions.

For existing holdings, keep acquisition records, costs, dividends, interest and realised transactions separate. Compare the site’s current-law and proposed-law calculations as scenarios using the tax-year labels shown. The existing deemed-return comparison uses 2025 constants; it is not a certified 2027 assessment. The actual-return model is not a newly enacted Prinsjesdag regime, and none of the four official alternatives has been implemented as an approved replacement.

We have not changed tax formulas, pension/benefit entitlements or selected-year parameters on the basis of these proposals. The new analysis is a policy reference, not personalised tax advice. Before acting on a sale, gift, company loan or migration, verify the applicable law and your own circumstances. A source-backed update will be needed when the legislative text or parliamentary status changes.