Official Property Value (WOZ)

A Number That Defines Your Home's Worth

The WOZ-waarde is the estimated market sale value of a property, as determined annually by the local municipality. This valuation is mandated by the Valuation of Immovable Property Act (Wet waardering onroerende zaken, or Wet WOZ). Each year, every property owner in the Netherlands receives an official assessment, the WOZ-beschikking, which states the value of their property on the valuation date, which is always January 1st of the preceding year. This single number is one of the most important figures in the Dutch housing system, as it forms the tax base for a wide range of municipal and national levies and has a direct influence on the maximum legal rent in the social sector.

Impact and Calculation

The WOZ-waarde serves as the foundation (grondslag) for several key taxes, including the municipal property tax (onroerendezaakbelasting - OZB), the owner-occupier's notional rental income for income tax (eigenwoningforfait), and water authority taxes. For tenants in the regulated sector, the WOZ-waarde is critically important because a percentage of it is converted into points under the Property Valuation System (WWS). A higher WOZ-waarde results in more points, which can be the deciding factor that pushes a property over the liberalization threshold into the much more expensive private sector. Municipalities calculate the WOZ-waarde using a mass appraisal method; they do not inspect every house individually each year. Instead, they use computer models that analyze sales data of comparable properties in the neighborhood. This efficient but impersonal method can lead to inaccuracies. An owner who believes their WOZ-waarde is too high (resulting in higher taxes) has the right to file a formal objection (bezwaar maken) with the municipality.