Nationality follows the buyer into a Spanish purchase

A Spanish house is bought under Spanish law, and nobody argues about that. What travels with the buyer is less visible. He arrives with an idea of what a purchase looks like, formed somewhere else, and his own country keeps a claim on the house while he owns it and after he stops.

So the useful advice differs by passport, though not over paperwork at the border. It differs over which assumptions survive the journey and which fail without saying so. The examples below are a German buyer's, because his expectations are easy to name, but the method transfers whatever the passport: find where the two systems meet, and ask both sides what happens at the join.

What the notary is for

A German buyer arrives with a settled picture of the notary. In it he is not a witness to the purchase; he is more or less the purchase itself. He drafts the contract, the draft sits with the buyer before anyone signs, the deed is read out at the table, and he carries the transfer through to the register. Nothing before that feels final.

Spain runs the same journey in another order, and the two ends swap places. The deal is shaped by the private contract with its deposit, signed well before a notary is involved, and what it commits you to depends on how it was drafted. The notary comes at the end, and not as your adviser. So the instinct that nothing is real until the notary lands on the wrong document. By the time you reach that table, whatever protection you have was put into that earlier contract by someone acting for you.

Two things therefore belong before the signature. One is when ownership actually passes, and what stands between signature and that moment, because where that moment sits decides what you hold if something goes wrong in between. The other is what this contract does if the seller walks away, and what it does if you do.

A smaller surprise waits at the same table. The deed records how a married couple holds the property, and the categories Spain uses are not your own country's list. It is a poor moment to be deciding. Settle beforehand which one your marriage goes into, who decides it, and what it changes on a later sale or death.

When the owner dies

Which country's law decides who inherits is itself a question; your passport is not automatically the answer. Where you habitually live may weigh more, and a will may be able to record a choice. What you want is which law would govern your estate today, and what writing a choice would change. The answer is only worth having with a date on it.

Systems vary in how far they let you leave property away from close relatives. They vary too, and this is the part people miss, in what the relative gets. A claim for money against the heirs is a different thing from a share of the house. Which of the two each side produces is worth establishing, and whether the region changes it, because on the Spanish side it can.

Then what the heirs must do, and in what order. How the estate reaches them, whether there is a step they must take before they can sell or mortgage the house, and what a Spanish notary and registrar want to see before they accept who the heirs are. Whether your own country issues papers in that form is better asked now than by an executor.

Whether a Spanish will covering only the Spanish assets would help is a separate question, and so is how it must be drafted to leave the will you already have standing.

And the order of events. If the Spanish tax falls due before the heirs can deal with the property, an estate that is mainly a house presents a bill before it presents any money. That is a solvable problem when you see it coming and an ugly one when you do not.

Two tax systems over one house

Countries generally tax property where it stands, and people where they live. A house in Spain owned by someone living elsewhere therefore sits inside two systems at once, and what keeps them from colliding is agreements made tax by tax. An agreement covering income tells you nothing about one covering inheritance. So the question repeats, once per tax: whether there is an agreement, and if not, what relief each country's own law gives for tax paid in the other.

Then the ordinary running questions. What Spain expects from a non-resident owner in a year the house stood empty, and what changes in a year it is let at all. If it is let, how that income is treated at each end, and whether income one country leaves alone still affects the rate it applies to everything else. That last one catches people out, because the bill moves in the country that is not taxing the rent.

Tax residence is rarely settled by a count of days alone, so a diary is evidence rather than protection, and the other tests are worth knowing before you plan around a number. Whether either country taxes net wealth, and whether a Spanish house falls inside it, is a question for both sides; countries differ and positions have moved.

Spanish inheritance tax, meanwhile, is regional rather than national. An answer about a house near Jávea is a Valencian answer, and the part most likely to have changed since someone last quoted you a figure.

The seam between two advisers

The common failure is not a bad adviser. It is two good ones, each correct at home, with nobody responsible for the join. A Steuerberater who has never read a Spanish deed and an abogado who has never seen a German return can both give sound answers that stop adding up the moment you set them side by side.

You can hear whether an adviser knows the seam is there. He asks about the other country before he answers: whether there is a will and what is in it, whether you are married and under what arrangement, whether there are children from an earlier marriage. He keeps who inherits separate from who taxes what they inherit, because those are two questions that can land in different countries. And when something falls outside what he can answer, he says so and names who it belongs to.

The one to be careful with answers quickly, in general terms, and in round numbers.

Nationality does not change the house. It changes which second system has a view on it, and it moves the real questions earlier, to before the private contract rather than after the deed. Buyers who ask Rocksure which lawyer to appoint get the same answer whatever the passport: your own, in each country, and willing to pick up the phone to the other.