A valuation is an opinion presented as a number. Everything about the way a tax administration works pushes against that. An assessment needs one figure, defensible as at a particular date, and the taxpayer who disagrees has a short and fixed period in which to say so.
Most disputes described as valuation disputes are not arguments about value. They are arguments about which statutory concept of value applies, about the date at which it is measured, and about who has to prove what. Those three questions are settled before anyone opens a spreadsheet, and a file that has not settled them is not ready to be defended.
Which value, and under which statute
There is no single value of a building for Dutch tax purposes. There is the WOZ value under the Wet waardering onroerende zaken. There is value in economic traffic for transfer tax under articles 9 and 52 of the Wet op belastingen van rechtsverkeer, which is at least the consideration. There is value in economic traffic at the time of acquisition for gift and inheritance tax under article 21, first paragraph, of the Successiewet 1956, with property in use as a dwelling taken at its WOZ value for the year of acquisition or, if the acquirer elects, the following year, under the fifth paragraph and subject to the paragraphs that follow it. And there is what independent parties would have agreed, under article 8b of the Wet op de vennootschapsbelasting 1969.
These can differ legitimately, and frequently do. One property can carry a WOZ value, a transfer tax base and an internal transfer price that are three different figures in the same year with nothing wrong anywhere. The error is to argue one of them using the logic of another.
The WOZ decision reaches further than the municipal bill
The municipal officer establishes the value by a decision open to objection under article 22 of the Wet WOZ, and that value applies for one calendar year. Article 23 lists what the decision must contain in any event, among them the property, the value assigned, the valuation reference date and the calendar year for which it applies.
Owners of commercial property treat this as a local matter. It is not confined to local taxes. Article 3.30a of the Wet inkomstenbelasting 2001, which article 8 of the Wet op de vennootschapsbelasting 1969 applies to corporate income tax, makes the WOZ value the floor below which a building cannot be depreciated, so a value set too high removes depreciation from the corporate income tax computation for the year to which that value applies. Article 21, fifth paragraph, of the Successiewet takes the same figure, subject to the paragraphs that follow it, as the taxable value of a dwelling passing by gift or on death.
That is what makes a standing policy on WOZ objections difficult. There is no single direction in which the owner wants the figure to move. A group that objects reflexively each year, and a group that never looks, have both skipped the question of which files the number feeds. Supervision of how values are determined and established rests with the Waarderingskamer under article 4, second paragraph, of the Wet WOZ.
The date, and the state of the property
Article 18, first paragraph, of the Wet WOZ sets the value at what the property is worth on the valuation reference date, in the state it is in on that date. The second paragraph places that date one year before the start of the calendar year for which the value is established. The value for 2026 reflects the market a full year earlier.
The lag produces a large share of complaints and almost none of them are arguable. In a falling market the figure looks stale and high, in a rising one it looks low. Neither is a ground of objection, because the statute prescribes the date rather than the market.
The third paragraph holds the exception that matters. Where in the preceding calendar year the property is absorbed into other property, changes as a result of building, conversion, improvement, demolition or destruction, changes its designated use, or undergoes a change in value from another special circumstance specific to it, the value is determined by reference to its state at the start of the year for which the value is set. A refurbishment completed in the intervening year counts. A general shift in the market does not.
The standard itself is a double fiction. Article 17, second paragraph, asks what the property would be worth if full and unencumbered ownership could be transferred and the acquirer could take it into use immediately and in full. It is valued, in other words, as though unencumbered and vacant. An owner comparing the WOZ figure with what an investor would pay for the tenanted asset is comparing two different questions. For property that is not a dwelling, other than property entered in the national monuments register, the third paragraph substitutes replacement value where that is higher. Separately, the fourth paragraph values a building under construction, as defined there, at that replacement value.
The methods the regulation prescribes
Article 4 of the Uitvoeringsregeling instructie waardebepaling Wet WOZ sets out how the value is found. Under its first paragraph, for the value under article 17, second paragraph, of the Wet WOZ, dwellings are valued by systematic comparison with dwellings for which market data are available. Property that is not a dwelling may be valued by capitalization of gross rent, by the same method of comparison, or by a discounted cash flow method.
Replacement value under the second paragraph is built up rather than observed. The land is valued by comparison, taking the designated use into account. The structure is taken at the cost of rebuilding an identical replacement object, corrected for technical obsolescence based on elapsed and remaining useful life with regard to residual value, and for functional obsolescence based on economic obsolescence, outdated construction methods, inefficiency and excessive operating costs.
The fourth paragraph is the provision most often left unused. For property in business use, the functional obsolescence factor in the replacement value calculation is set so that the value corresponds to the business value, having regard to the economic situation in the relevant industry or sector. A specialized building in a sector under pressure is not worth its rebuilding cost less age, and the regulation says so. That argument needs evidence about the sector rather than the building, which is why it is rarely run and often available.
Objection, appeal, and the file the other side must produce
Article 6:7 of the Algemene wet bestuursrecht gives six weeks to lodge an objection or an appeal. For a WOZ decision or a tax assessment, the start of that period is set in derogation from article 6:8 of that act: articles 22j and 26c of the Algemene wet inzake rijksbelastingen, which article 30 of the Wet WOZ also applies to WOZ decisions, run the period for objecting from the day after the date the assessment or the copy of the decision bears, and the period for appealing from the day after the date of the decision on the objection, in each case unless that date is earlier than the day the document was made known, in which case article 6:8, first paragraph, applies and the period runs from the day after the document was made known in the prescribed way. Six weeks is not long enough to commission a valuation from a standing start, which is an argument for reading the decision on arrival.
Article 40, second paragraph, of the Wet WOZ obliges the municipal officer to provide, on request, to the person the decision concerns, a copy of the data on which the established value rests. That is the first step, and the place to look for the comparables relied on, the adjustments made to them and any capitalization factor applied. An objection drafted before that document has been read is an objection against a figure of unknown derivation.
At the appeal stage, article 8:42 of the Awb requires the administrative body, within four weeks of the grounds of appeal being sent to it, to send the documents relating to the case to the court, a period the court may extend under the second paragraph. What falls inside that description is regularly contested, and pressing for the underlying model rather than a summary sheet is ordinary procedure.
Burden of proof, and how it moves
Ordinarily each side has to make its own figure plausible, and a court weighing two supported valuations will not simply prefer the official one. Two provisions displace that position, and both are worth understanding before they are triggered.
Article 52a of the Algemene wet inzake rijksbelastingen allows the inspector to record, by a decision open to objection, that the obligations listed in it, among them those under articles 47 and 52, have not been met in full, in respect of an assessment or decision still to be made. Where such a decision becomes irrevocable, or where the required return was not filed, article 25, third paragraph, provides that the assessment is upheld on objection unless it appears that and to what extent it is incorrect. Article 27e applies the same rule in court. Article 30 of the Wet WOZ applies articles 25 to 30, 47 and 52a of the Algemene wet inzake rijksbelastingen, among others, to the determination and establishment of WOZ values, so the mechanism is not confined to national taxes.
That is a change in kind rather than degree. It replaces making a case plausible with establishing it, and puts that heavier burden on the taxpayer. In a valuation dispute the effect is close to decisive, because a valuation is by nature a range and a range is hard to establish to that standard.
The obligation that leads there is broad. Article 47 requires everyone to provide, on request, the data and information that may be relevant to their own taxation, and to make available the books and records whose consultation may be relevant to establishing the facts. Withholding an internal valuation because it is unhelpful is the route to an information decision.
Valuation inside the corporate file
The same question arrives in the corporate income tax file without the word valuation attached. Article 8b determines the profit of related entities as though the conditions between them were those independent parties would have agreed, and its third paragraph requires those entities to record in their books how their transfer prices came about and whether they meet that standard. A property moved between group companies is priced, and that price is a valuation whether or not anyone commissioned one.
Article 8bd of the Wet op de vennootschapsbelasting 1969 allocates the burden expressly. Where an asset other than a debt is received from a related entity by capital contribution, profit distribution, repayment of paid-in capital, liquidation distribution or a comparable legal act, and its value in economic traffic at the time of acquisition exceeds the value taken into account at the transferring entity in a tax on profit, the recipient books the lower figure and must make that value plausible.
Transfer tax works to the same standard. Article 9 of the Wet op belastingen van rechtsverkeer takes the value of the property, which is at least the consideration, and article 52 defines value as value in economic traffic. Where the tax is due and no exemption under article 15 applies, a group transferring at book value where market value is higher is taxed on the market value, and the deed is evidence rather than the answer.
What a defensible valuation file looks like
A named statutory standard with the article beside it. A stated date and the reason it is that date. A method taken from those the applicable rules recognize, applied the same way each year. The inputs with their sources: comparables with their transaction dates, the capitalization factor with the evidence behind it, the rebuilding cost with the basis on which it was quantified.
Then the case against, answered in writing at the time. A valuation that argues only for its own figure reads as advocacy. One that records why the higher comparable was set aside reads as work, and only the second kind survives a reader looking for a reason to reject it.
Article 52, fourth paragraph, of the Algemene wet inzake rijksbelastingen requires those obliged to keep records to retain them for seven years unless the tax law provides otherwise, and article 16 allows an additional assessment, where its conditions are met, within five years of the tax debt arising, or twelve where the item was held or arose abroad, subject to the adjustments in that article. A valuation will therefore be examined years afterwards by people who were not present when it was made.
That is the point on which these disputes turn. A figure that was defensible when it was set stays defensible only if the reasoning travels with it. Without the reasoning it is a number, and the other side has one of those as well.
This article is informational and does not constitute tax, legal or investment advice. Each engagement is subject to scope and applicable regulation.