Double taxation: how your country's treaty stops you from paying twice for your home in Spain

It's one of the questions I get asked most often at the office by people who live outside Spain but own an apartment, a villa or a little house by the sea here: 'Moisés, if I pay tax on this house in Spain, are they going to charge me again in my own country for the same thing?' It's a logical and very reasonable concern. Nobody likes the idea of paying twice for the same thing.

The good news is that, precisely to avoid that, double taxation treaties (Convenio para evitar la doble imposición, CDI) exist. Spain has signed a great many of them, with almost every country my clients come from. I'm going to explain how they work for what really matters to you: your home in Spain. No jargon, and with both feet on the ground.

Will I pay tax here and in my own country?

Let's start by understanding where the problem comes from. When you own a home in Spain but live, say, in Germany or the United Kingdom, there are, in theory, two countries that could want to tax that property. Spain, because the house is here. And your country of residence, because that is where you are tax resident and where, as a general rule, you declare everything you own worldwide.

If both simply charged you for the same thing, it would be unfair: you'd be paying twice. To prevent that, Spain and your country sign an agreement — the double taxation treaty, which we lawyers call the CDI — that sets out who taxes what. It's not that one of the two gives up everything; it's that they agree on the rules of the game so that, in the end, you don't pay twice over.

So the short answer is: as a rule, your property is taxed in Spain, and your country of residence applies a mechanism so that this tax is not added on top again over there. Now let me walk you through how, step by step.

The golden rule: the property is taxed where it stands

Almost every treaty follows the same international model (the OECD Model, in case you hear it mentioned). And that model has a very simple rule for real estate, set out in its Article 6: income arising from a property is taxed in the country where the property is located. Your home is in Spain, so Spain can tax whatever that property generates. It makes complete sense: bricks and mortar don't move, and yours are here.

But here comes the MOST important nuance in this whole article, and I want you to hold on to it. Treaties use a phrase that is very misleading: they say that such income 'may be taxed' in Spain. Many people read that and understand 'so it is ONLY paid in Spain'. And that is not the case.

Understanding this saves you from two typical mistakes: thinking you don't have to declare anything in your own country (when very often you do, even if you don't pay), or thinking you're going to pay the full tax twice over (when the treaty exists precisely to prevent that).

Three situations where this affects you

Your home in Spain can create tax obligations for you at three different points. In all three, the underlying rule is the same — Spain can tax because the property is here — but it's worth distinguishing between them:

1. You rent it out

If you let the property, that income is rental income from the property, and Spain taxes it. There's a detail here that matters depending on where you're from: residents of the European Union or the European Economic Area are allowed to deduct certain rental expenses before being taxed; for those from outside the EU, the treatment is, in principle, less favourable. Further on I'll tell you what happens, for example, with British owners after Brexit.

2. You keep it for yourself and don't rent it out

This surprises a lot of people: even if you do NOT let the house and use it only for your own holidays, the Spanish Tax Agency (Hacienda) treats a property that is available to you as 'generating' income, and imputes to you a small amount calculated on the cadastral value (around 1.1% or 2%, depending on the case). This is what's known as renta imputada (imputed income), and it is paid every year for the simple fact of owning the house. This also falls within what Spain is entitled to tax.

3. You sell it

When you sell, if you make a gain compared with what the property cost you, that gain is also taxed in Spain. Note that a sale is not covered by the same article as rental income: in most treaties, the gain from selling a property sits under a different article (Article 13), but the conclusion is the same — the country where the property is located can tax the gain. And remember one practical figure: when a non-resident sells, the buyer is required to withhold 3% of the price and pay it to the Spanish Tax Agency as an advance payment of tax. This is not an extra tax; it's a payment on account of whatever you end up owing.

How your country stops you paying twice: the two methods

Once Spain has taxed your home, it's your country of residence's turn to do its part so you don't end up paying twice for the same thing. And for that, treaties basically use two techniques. Which one applies to you depends on your country's treaty, but it's worth knowing both.

The exemption method (sometimes with progression)

With this method, your country of residence leaves that Spanish income out: it does not tax it again. In its purest form, you simply forget about it. But there is a very common variant called 'exemption with progression', and it's worth understanding properly, because it's easy to get confused.

With exemption with progression, your country does not charge tax on the Spanish income, BUT it does take it into account to work out the rate applied to the REST of your money. Let me put it in a picture for you: imagine your income in the country where you live climbing up steps on a tax ladder. The income from your house in Spain doesn't pay for its own step, but it 'pushes' the rest of your income upward, which can end up being taxed at a somewhat higher rate. You don't pay twice for the house, but that income does influence your overall rate.

The tax credit (imputation) method

With this method, your country does include the Spanish income on your tax return, but lets you deduct the tax you already paid in Spain. This is called a tax credit: what you paid here is subtracted from what you would otherwise owe there. There is usually a limit (you can't deduct more than that income would be taxed in your own country), but the idea is clear: the Spanish tax is not lost — it is used to avoid paying again.

Which of the two applies to you? It depends on your country's treaty and, very often, on the specific type of income. That's why the next point matters so much.

Your country matters: it depends on the specific treaty

This is where I have to be honest with you and ask for caution: every treaty is its own world, and the fine detail depends on your country's specific text and its domestic rules. I'll give you a few brushstrokes on the cases I see most often on the Costa Blanca, but this is guidance, not a closed answer for your particular situation.

Notice that I haven't given you a fixed percentage country by country beyond what's strictly necessary, and that's deliberate. Promising firm figures without looking at your treaty and your situation would be exactly the kind of shortcut I refuse to offer you. The serious thing to do is look at your own case.

The role of the tax residency certificate 'for Treaty purposes'

For your country's treaty to actually apply, there is one document that is the key to everything: the tax residency certificate 'for Treaty purposes'. It is issued by the tax authority of the country where you live, and it serves to show the Spanish Tax Agency that you are tax resident there and that, as a result, you can rely on the treaty between Spain and your country.

And watch out for a detail I see go wrong a lot: any generic residency certificate will not do. It must state expressly that you are resident 'for Treaty purposes' with Spain. If you bring the wrong document, the Spanish Tax Agency can apply domestic rules directly, without the treaty's benefits, and you would have to pay first and later claim a refund by providing the correct certificate. Getting the paperwork wrong translates directly into time and money.

In the specific case of real estate, the certificate does not stop Spain from taxing your property (the treaty allows that regardless), but it is essential for activating the method that avoids double taxation in your own country, and for properly resolving a sale, a gain, or a possible dispute over where you are resident. In short: request it correctly from the very start.

Does Spain have a treaty with your country?

Most likely, yes. Spain has a very extensive network of signed treaties, covering almost every country my clients in Calp and the surrounding area come from. The official, up-to-date list is published by the Spanish Tax Agency (Agencia Tributaria) itself, and it's the place to check whether your country is included and which treaty applies.

If you own a home in Spain and live abroad, or you're thinking of buying one, write to me and we'll review it together: which country you're from, which treaty applies to you, which method your country will use, and what paperwork you need to make everything fit. I would rather sit down with you and understand your case than hand you a textbook answer that might not be yours. First understand, then prevent, and only then act. That's how I work.