Rent calculators
Raise a Dutch rent by the statutory cap, not by an index.
There is no index to divide by here. The Dutch increase is a percentage set each year for the social, mid market and free sectors, and it is capped a second time by the WWS maximum rent.
It fixes the anniversary, and where an index applies, the starting index.
The anniversary you are claiming.
What the lease or the notice sets. A statutory ceiling brings it down where one applies.
Rent today
€850,00
Revised rent
€875,50
The difference
+€25,50
€306,00 over a year
The working
€850,00 × (1 + 3,0 %) = €875,50
From 24 Sep 2026 the rent goes from €850,00 to €875,50, +€25,50 a month. The Netherlands has no index formula: rent rises by a statutory percentage set each year per sector, and never above the WWS maximum for that sector. Dardaris does not hold this dwelling's point score, so check the new rent against the ceiling before you send the notice. Give the tenant written notice stating the current rent, the new rent, the percentage, the statutory basis and the objection route to the Huurcommissie. There is no back-claiming, the increase runs from the date on the notice. A tenant can still have the starting rent tested by the Huurcommissie, and for social and mid-market contracts signed from 1 July 2024 that right never expires. A rent found too high is lowered retroactively to the start of the lease.
What governs in Netherlands
- Index
- Statutory annual increase cap (no index series)
- Formula
- new rent = the lower of (current rent × (1 + the cap for this sector)) and the WWS maximum rent for the sector
Nothing is stored and nothing is sent. This runs the same calculation engine the product itself runs, in this browser.
What the rules actually say
The rules Dardaris applies in the Netherlands.
Every line below is read off the same jurisdiction pack the product runs on, and each one says whether anybody has confirmed it in a source.
- Index
Statutory annual increase cap (no index series)
Set each year per sector by the Rijksoverheid; the mid-market cap tracks CAO wage growth plus one percentage point.
Confirmed in a primary source
- Formula
new rent = the lower of (current rent × (1 + the cap for this sector)) and the WWS maximum rent for the sector
Caps for 2026: social/regulated 4.1% from 1 July, mid-market (middenhuur) 6.1%, free sector 4.4%. Rents under about €350 may instead rise by up to €25 in absolute terms, and the social sector has income-dependent surcharges on top.
Confirmed in a primary source
- Notice
A written demand is required
Written notice to the tenant, with the objection route to the Huurcommissie stated. At least two months ahead is reported, confirm.
Confirmed in a primary source
- Back claim
Nothing can be back claimed
No back-claiming. An increase takes effect from the date on the notice and no earlier.
Confirmed in a primary source
The questions that follow.
- Is there a rent index in the Netherlands?
- No. The yearly increase is a statutory cap rather than an index ratio, published per sector by the Rijksoverheid. For 2026 it is 4.1 per cent for social and regulated rents, 6.1 for the mid market and 4.4 for the free sector.
- What is the WWS and why does it matter?
- The point score that decides which sector a dwelling is in and the maximum rent it may charge. The increase is capped by the percentage and again by that ceiling.
- What notice does a Dutch rent increase need?
- Written notice stating the current rent, the new rent, the percentage, the statutory basis and the tenant's route to object at the Huurcommissie. There is no back claiming.
The same calculator, under other law.
A rent rises differently in each of these, and the page for each one says how. Anywhere else, the calculator still runs on that jurisdiction's own pack.
The calculation takes a minute. The date is what costs you.
Nobody forfeits a year because the arithmetic defeated them. They forfeit it because the anniversary fell in a quiet month, the index was not out yet, and by the time it was, there was nothing to remind them.
- It watches the anniversary for youDardaris holds the lease, its reference quarter and its anniversary, and tells you a revision is due rather than waiting to be asked.
- And works it out on the right two figuresThe reference quarter the lease names, against the same quarter a year earlier, applied to the rent in payment. The DPE block and the twelve month window are part of the same answer.
- But it does not send itA letter that raises somebody's rent waits for you. Dardaris prepares it and says what it is based on, and you are the one who decides it goes.
The number is the easy part.
Dardaris keeps the lease, raises the invoice, matches the payment and writes down what it did. Bring one building and watch a month before you decide anything.
14 days before the first charge · Nothing is switched on until you say so