The Box 3 Sell-Off Is Turning Cheap Dutch Rentals Into Homes Internationals Can't Buy

Box 3 used to be a tax on fictional returns. The Dutch government assumed your savings and investments earned a certain percentage, and taxed you on that assumed amount — regardless of what you actually made. The Supreme Court ruled that unconstitutional. Fair enough. The fix, though, is landing on renters like a brick.

From 2026, the tax-free allowance in Box 3 goes up to €59,357, and the deemed return on non-bank assets — including rental property — rises to 6%. The tax rate stays at 36%. But here's the part that's actually pushing landlords to sell: the leegwaarderatio, the valuation discount that let landlords declare rented properties below full WOZ value, is being gutted. Landlords renting to family or at below-market rates can't use it anymore. They have to declare the full WOZ value.

For a landlord with a modest rental in a city where WOZ values have climbed, that's a tax bill that can exceed the actual rental yield. The property costs more to hold than it earns. So they sell.

In 2028, a new law — the Wet werkelijk rendement box 3 — will shift taxation to actual returns instead of deemed ones. That might eventually stabilize things. But between now and 2028, the rules reward selling, and landlords are acting accordingly.

Since Q3 2024, the supply of rental homes in the Netherlands has dropped by 37% compared to the same period in 2023. Over the past year, 26,180 individual rental homes were sold. More than half of investors and housing associations say they plan to keep selling or accelerate the pace.

In Amsterdam, the share of homes owned by private investors fell from 7.4% to 6.2% — roughly 5,000 rental units gone. The mid-rental segment has shrunk from 18% of the private rental market in Q1 2022 to 12% in Q3 2025. Liberalized, high-rent housing now makes up 83% of what's left.

This isn't a future prediction. It's already happened.

Amsterdam gets the headlines, but the sell-off is gutting smaller Dutch cities and towns even more aggressively. The private rental sector is rapidly dwindling in places where the mid-rent market was already thin — Venray, and similar towns where a €900–€1,200/month apartment was the realistic option for an international worker or a student.

In the big cities, liberalized rentals and corporate landlords absorb some of the shock. In a town with 40,000 people, there's no such buffer. The private landlord with two apartments was the market. When they sell, the rental doesn't move to a bigger portfolio — it leaves the rental stock entirely.

I've seen this pattern in the listings House Hunter watches. A mid-rent apartment in a smaller city appears on Funda as a sale before it ever surfaces on Pararius as a rental. The international renter never had a chance to see it.

The apartment that was renting for €1,050 a month in Venray gets sold and listed for €245,000. A Dutch first-time buyer with a stable income, a BSN, and a mortgage pre-approval buys it. That's a win for someone — but not for the international worker who was living in it, or the one who would have moved in next.

Internationals face a wall of barriers to ownership. Many don't have permanent residency. Many don't have a Dutch credit history. Many are on temporary contracts. Some don't have a BSN yet. Banks want certainty, and the Dutch mortgage process is built around documentation that a recent arrival simply doesn't have.

So the affordable rental disappears, and the home that replaces it on the market is inaccessible to the exact person who needed it. The renter doesn't get promoted to buyer. They get displaced.

Apartment prices per square meter are up 6.4% year-on-year as of Q3 2025. The owner-occupied market is absorbing former rentals, but the buyers benefiting are overwhelmingly Dutch nationals with established financial profiles.

The share of mid-rental homes has dropped from 18% to 12% in three years. That's the segment between social housing and the liberalized market — the €808–€1,157 range under the Woningwet framework that was supposed to protect middle-income renters.

The Woningwet reforms were meant to cap rents and stabilize the mid-market. Instead, landlords who can't make the numbers work under Box 3 are exiting before the caps bind them. They sell. The home becomes owner-occupied. The rent cap is moot because there's no rental anymore.

Huurtoeslag, the housing allowance that helps lower-income renters, only applies within the regulated segment. If the regulated segment is shrinking because the homes are being sold, huurtoeslag doesn't help you find a home — it just helps you pay for one that increasingly doesn't exist.

I talk to internationals every week who are hunting in this segment. They're not looking for luxury. They need a clean apartment in a city where they work, at a price that fits a starting salary or a PhD stipend. That apartment is the one being sold out from under them.

The government has proposed that 66% of new-build homes be affordable, with 30% for social rentals and up to 40% for mid-rental and affordable owner-occupied housing. That's a real commitment on paper. But new construction is slow, and the net additions to the housing stock aren't keeping pace with the loss of private rentals.

More than half of investors plan to keep selling. The 2028 shift to actual-returns taxation might eventually slow the exodus, but the interim years are the problem. By the time the new regime stabilizes investor confidence, the affordable rental stock will be meaningfully smaller.

For internationals, the practical reality is this: the window to find an affordable rental in a smaller Dutch city is narrowing. The homes are being sold. The buyers are domestic. The rentals aren't coming back.

If you're hunting for a rental right now, speed matters more than it ever has. The listing you see today on Pararius or Kamernet may not be a listing tomorrow — it may be a Funda sale. That's why we built House Hunter the way we did: watching 1,000+ sites continuously, because the margin between available and sold is now measured in hours, not days.