Your Landlord's Box 3 Tax Hike Is Quietly Coming Out of Your Rent

If you're an international renting in Amsterdam, Utrecht, or Rotterdam, you probably don't file Dutch taxes. You don't think about Box 3, because it's not your problem. Except it is.

Box 3 is the Dutch tax category for income from savings and investments — including second homes and rental properties. Starting January 1, 2028, the system flips from taxing a fictional deemed return to taxing actual returns: real rental income, real capital gains. For landlords with high-yield properties in hot markets, this means a significantly higher tax bill.

And they're not going to eat that cost.

The old system taxed a deemed return on the WOZ value of the property, regardless of what the landlord actually earned. The Dutch Supreme Court ruled twice — December 2021 and June 2024 — that this violated the European Convention on Human Rights, because it could tax people on income they never actually received. The fix? Tax real returns instead. Sounds fair. But in a tight rental market, "fair" has consequences.

Here's the mechanism. From 2028, landlords renting out a property at least 90% of the year will be taxed on actual rental income minus deductible costs like maintenance and mortgage interest. The flat tax rate is 36%, with a tax-free threshold of €1,800 per person per year.

Under the old system, a property with a €500,000 WOZ value and a deemed 5% return generated a taxable base of €25,000 — roughly €9,000 in tax at 36%. Under the new system, if that same property pulls in €40,000 in rent with €5,000 in deductible costs, the taxable base jumps to €35,000. Tax: €12,600. That's €3,600 more per year, on one property.

Now spread that across a landlord's portfolio. A small-scale landlord with three or four Amsterdam apartments could see their annual tax bill rise by €10,000–€15,000. The administrative burden also increases — landlords must now maintain separate accounts for rental income and capital gains, tracking the January 1, 2028 WOZ value as the baseline for future capital gains tax.

There's also a new capital gains tax on appreciation after 2028. Previously, capital gains on second homes weren't taxed for Dutch residents. Now they are. And landlords know this is coming, which means some are already adjusting rents in 2026 and 2027 to build a buffer.

This is the part that frustrates me. Rents in the Netherlands were already 4.4% higher in July 2026 than a year earlier, with private sector rents in major cities rising even faster. That's well above inflation. And while there are many factors — housing shortage, population growth, shrinking rental supply — the Box 3 change is a concrete, quantifiable cost increase that landlords are already pricing in.

If you're on a liberalized (free-sector) contract — meaning your rent is above the regulatory threshold and not subject to the huurcommissie's maximum increase rules — your landlord can raise rent at contract renewal with essentially no cap. Market forces set the price. And market forces, right now, are telling landlords: your costs are going up, so charge more.

The math is straightforward. A landlord facing €3,600 in additional annual tax on a single property needs to recover roughly €300 per month to break even. Even if they only pass through half of that, it's €150 per month. On a typical Amsterdam free-sector apartment renting at €2,000–€2,500, that's a 6–7.5% increase — on top of whatever inflation adjustment they'd normally apply.

International tenants are especially exposed because they disproportionately rent in the free-sector segment. They don't qualify for social housing, they don't have huurtoeslag, and they often sign liberalized contracts because the properties they're renting are above the liberalisation threshold. They also tend to be less aware of Dutch regulatory changes — nobody at the gemeente sends you a letter about Box 3 when you register for your BSN.

Some landlords won't raise rents — they'll sell. The combination of higher taxes, increased administrative complexity, and tighter regulation is pushing small-scale landlords out of the rental market entirely. When they sell, the property typically moves to owner-occupation, removing a rental unit from an already squeezed supply.

This is already happening. Landlords are citing regulation and tax changes as reasons to exit. Each property that leaves the rental market means one fewer option for tenants, which means more competition for what remains, which means higher rents for the units that stay.

It's a feedback loop. Higher taxes push some landlords to sell. Reduced supply increases competition. Competition pushes up free-sector rents. The remaining landlords can charge more, which partially offsets their higher tax bill — but tenants are the ones paying.

The regulated segment offers some protection. If your rent is below the liberalisation threshold and you're registered with the huurcommissie, your annual increase is capped. But even there, supply is shrinking as landlords sell or convert properties, and waiting lists grow.

First, know what kind of contract you have. If you're on a liberalized contract, your landlord has significant freedom to raise rent at renewal. Check whether your rent is above the liberalisation threshold — in 2026, that threshold sits around €879.66 per month. If you're above it, you're in the free sector, and you have limited protection against increases.

Second, understand that the Box 3 change is a structural cost increase for landlords, not a one-off. This isn't a temporary spike that will normalize. The new system is permanent. Landlords will be pricing it in for years, and each contract renewal is an opportunity to adjust.

Third, if you're house-hunting right now, factor in the likelihood of above-inflation increases over the next two to three years. A rent that seems manageable today may not stay that way. Negotiate longer-term contracts if possible, or ask for a fixed increase schedule in writing.

At House Hunter, we've seen tenants get caught off guard by sudden €75–€100 monthly increases at renewal. They had no idea the tax landscape was shifting. The landlords did — they read the news, talked to their accountants, and adjusted. The tenants just got the email saying "your new rent is X."

This isn't about blaming landlords. They're responding rationally to a real cost increase. But the information asymmetry is brutal. Dutch landlords know exactly what's coming. International tenants often don't even know Box 3 exists.