Wet modernisering servicekosten: how you explain the new rules before the objections flood in

The first email may already be sitting in your inbox. A tenant has read something about new rules for servicekosten (service costs) and wants to know whether their advance payment is going down. Your colleague on the service desk looks it up and finds two dates: a news item about 1 July 2026 and another about 1 January 2027. The question lands on your desk, with the comment "do you know how this works?".

That confusion makes sense, and you'll run into it more often over the coming months. The Wet modernisering servicekosten (Act on the modernisation of service costs) was originally due to take effect on 1 July 2026, but the Dutch government confirmed on 1 April 2026 that the act now enters into force on 1 January 2027. Aedes itself pushed for that postponement, because otherwise landlords would have had to run two settlement systems side by side for financial year 2026. Good news for your administration, but it also means tenants will keep coming across messages with different dates for months to come.

What the Wet modernisering servicekosten actually regulates

The core of the act is an exhaustive list: eight clearly defined categories of servicekosten will determine what you, as a landlord, are allowed to charge on. Right now, open standards and case law decide what counts as reasonable, and that's exactly what fuels many disputes at the Huurcommissie (the Dutch rent tribunal). Under the new act, it will be written in black and white which items do and don't belong in the advance payment. Some familiar categories merge: waste, caretaker services and communal areas fall together under supervision, security and waste. Utilities with an individual meter will also fall under servicekosten from now on.

The Huurcommissie is also getting broader powers. It will soon be able to review every item in an advance payment, and smaller groups of tenants will find it easier to file a collective request. So expect tenants who have doubts about their settlement to find a formal route more quickly than they can now.

Caps and deadlines your administration needs to line up with

According to Aedes's overview, concrete caps are on the way. For insurance and maintenance funds, a maximum of 6 euros per month applies, and the reserve in such a fund may not exceed three times the annual contribution. Administration costs are capped at 2% for utilities and 5% for other items, with a range of 7.50 to 75 euros per home per year.

More important for your process: the annual settlement must reach the tenant by 1 July at the latest. If you don't deliver it, the Huurcommissie applies standard amounts instead. A forgotten settlement is then no longer just an oversight, it's something that can cost you money directly.

Two regimes side by side, and why explaining them becomes your job

The new rules apply to rental contracts signed on or after 1 January 2027. Existing contracts keep the current system, unless you and the tenant agree together to switch over. That sounds like a calm transition, but in practice it means you'll be managing two regimes side by side for years. Two neighbours in the same building could end up with differently structured servicekosten statements, and that comparison between neighbours is exactly where questions and objections start.

On top of that, tenants have already started searching. Anyone looking up the new rules now finds news items with the old start date of 1 July 2026 sitting alongside items about 1 January 2027. If your team doesn't have one clear answer ready, every individual question will start taking on a life of its own.

Start with a standard answer, not a system overhaul

You don't need to switch over your administration until 1 January 2027, but your communication can't wait. A practical order to follow:

First, write a half-page standard answer for your service desk: what's changing, from when, and who it does and doesn't apply to. Explicitly mention that the start date has shifted from 1 July 2026 to 1 January 2027, since that's the confusion already landing in your inbox.

Next, go through your current rental offers. Any contract starting on or after 1 January 2027 falls under the new rules, so you'll want to build those advance payments around the eight new categories from the outset.

Finally, make a conscious decision about whether you want to voluntarily harmonise your existing contracts. One system across your whole portfolio saves years of double explaining, but it requires each tenant's consent. Even if you decide not to, that's a decision you'll want to be able to explain, because the first tenant who asks about it is probably already on the phone.