Box 3: what’s changing — and what does it mean for a home in Spain?
12 June 2026
A clear explanation for Dutch nationals considering a home in Spain
The rules around Box 3 have shifted considerably in recent years. Deemed returns, rebuttal provisions, an upcoming new system — for many Dutch nationals it’s hard to keep track of what applies and what it means. Especially if you have or are considering a home in Spain. What does Box 3 mean in 2026 for a home in Spain?
In this article I explain how Box 3 currently works, how a Spanish home is taxed within it, and why Spain is becoming more attractive for some Dutch nationals — while others should be cautious.
How does Box 3 work in 2026?
The old Box 3 system worked with fixed deemed returns: the Tax Administration assumed a notional return, regardless of what you actually earned. After years of legal disputes — with the Supreme Court’s Christmas ruling in 2021 as the turning point — that system has been changing step by step.
The situation in 2026:
- The deemed-return system is still in force. A bridging arrangement applies pending a new system.
- Assets are divided into categories: savings (deemed return 1.28%), other assets including real estate and investments (6.00%), and debts (2.70%).
- The rate is 36% on the calculated deemed return.
- The tax-free allowance is €59,357 per person, or €118,714 for tax partners.
- Since July 2025, the rebuttal provision lets you demonstrate that your actual return is lower than the deemed rate. The Tax Administration then calculates using the lower amount. Note: actual return includes not only income (rent, interest) but also realised and unrealised changes in value.
What’s still to come?
The government is working on an entirely new system based on actual returns (Box 3 Actual Return Act, bill 36.748). The expected entry into force has shifted from 2027 to 2028 — and depends on approval by the House of Representatives and the Senate. Until then, the current bridging rules remain in force.
What does this mean for real estate?
Under the current rules, real estate is taxed on a deemed return of 6% on its value — regardless of whether your actual return is higher or lower. For a home worth €500,000, that means a notional return of €30,000, on which you pay 36% tax: €10,800. If you have a tax partner and the home is your only Box 3 asset, the tax-free allowance is deducted first and the tax works out lower.
If your actual return turns out lower — for example because you use the home yourself and there’s no rental income — you can use the rebuttal provision to have the lower actual return taxed instead. But note: unrealised value increases count towards this too.
How is a home in Spain taxed in Box 3?
For Dutch taxpayers, a home in Spain falls under Box 3, in the category “other assets.” Its value is determined based on its fair market value on 1 January — there’s no WOZ value as in the Netherlands.
But there are two important nuances that many people aren’t aware of:
1. You also pay tax in Spain
As a non-resident, in Spain you also pay, among other things:
- Property tax (IBI) — annual, based on the cadastral value
- Non-resident income tax (IRNR) — annual, 19% for EU/EEA residents, 24% for non-EU residents (including the UK since Brexit)
- Wealth tax — depending on the region and the total value of Spanish assets (threshold and rates vary by autonomous region)
2. The Netherlands prevents double taxation
Thanks to the tax treaty between the Netherlands and Spain, double taxation is prevented. This works as follows:
- You declare the Spanish home in Box 3.
- The Netherlands calculates the regular Box 3 levy.
- You then receive a double taxation relief deduction for the part relating to the Spanish home.
The result: the effective tax burden on a Spanish home is, in most cases, lower than on comparable Dutch real estate — because what you pay in Spain is often less than the Dutch Box 3 levy would be, and the treaty neutralises the difference.
Why some Dutch nationals are looking to Spain
Under the current Box 3 rules, real estate in the Netherlands is taxed relatively heavily — largely due to the 6% deemed return. For those who already own property in the Netherlands and are looking to diversify, a home in Spain can be appealing:
- Lower effective tax burden thanks to the tax treaty
- Diversification of assets across multiple countries and markets
- Rental yield (provided it’s arranged legally and in line with Spanish regulations)
- Personal use — for holidays, wintering, or eventually permanent residence
But that doesn’t mean a home in Spain is always tax-advantageous. It depends on:
- The value of the home and your total assets
- The region in Spain (Catalonia has its own wealth tax rules)
- Your residency status and the tax treaty
- Whether you rent it out or use the home yourself
When should you be cautious?
A home in Spain can be financially attractive, but not for everyone. Caution is needed when:
- Your total assets are already substantial and Spanish wealth tax becomes an additional burden
- You’re not familiar with the Spanish tax obligations for non-residents (you’re required to file a return annually, even if you don’t rent out the home)
- You assume renting out is always simple or permitted (the rules in Catalonia are strict — see my article on the new housing law)
- You’re buying primarily for tax reasons — buying a home in Spain should fit your life and your plans, not just your tax strategy
Also don’t forget the Modelo 720: as a Dutch taxpayer you’re required to report foreign assets above €50,000 to the Tax Administration. A Spanish home almost always falls under this.
What does this mean for you in practice?
The current Box 3 rules make real estate in the Netherlands more expensive. A home in Spain can therefore seem more attractive — and sometimes it is. But it still depends on your personal situation.
It’s important that you:
- Understand the tax rules in both countries
- Know how the tax treaty applies to your situation
- Take a realistic view of costs, returns, and obligations
- Don’t let fear or haste guide your decision
- Seek advice from a tax advisor who knows both systems
In closing
A home in Spain can be a wonderful investment — both financially and personally. But the tax side deserves attention. The changes to Box 3, the bridging rules in 2026, and the upcoming new system make it all the more important to be well informed.
I’m not a tax advisor — but I do make sure you find the right specialist who knows both systems. So you can make a choice that fits your life, your plans, and your financial situation.
Disclaimer: This article is intended as general information and is based on the regulations in force in 2026. I am not a tax or financial advisor. For personal advice about your situation, it’s wise to consult a recognised tax specialist. The amounts and percentages mentioned may change — always consult the Tax Administration or your advisor for the current figures.
Last updated: June 2026