Modelo 650: the Spanish Inheritance Tax Form Explained

Here is how most British families find out the Modelo 650 exists. Someone dies, usually a parent, and there is a house in Spain, maybe an account with a Spanish bank. The family assumes the UK probate process covers it. Then they try to sell the house, or move the money, and everything stops. In practice, the bank will not release the balance until it sees the Spanish inheritance tax settled, and no buyer's lawyer will let a purchase complete while the tax hangs over the house. And somewhere in the middle of the grief, somebody mentions a form with a number, in Spanish, with a deadline that has already been running for months.

My name is Daniel Bertomeu. The legal side of what follows is my father's territory. Juan Bertomeu, ICALI 4643, has been handling inheritances for foreign families from the offices in Moraira and Dénia since 1991, and a large part of that work is exactly this: estates where the heirs live abroad, the paperwork is in two languages, and the clock started ticking before anyone knew there was a clock.

So let me walk you through it the way we would across the desk.

What the Modelo 650 actually is

The Modelo 650 is the form you use to declare and pay Spanish inheritance tax. That is the whole of it. When you inherit assets in Spain, whether through a will, an intestacy or as the beneficiary of a Spanish life insurance policy taken out by someone else, you calculate the tax yourself and file it on this form. The Spanish system does not send you a bill. You self-assess, you file, you pay.

And here is why you cannot simply ignore it and hope. Until the inheritance tax is dealt with, the estate is stuck in practice: banks ask for proof the tax is settled before they release the deceased's balances, and nobody involved in a sale will move while the tax is unresolved. The law itself is the reason: the inherited assets themselves stay liable for the tax in the hands of the heirs and later holders, with a narrow exception for good-faith buyers protected by the Land Registry's public-faith rules. So an unpaid inheritance tax bill does not fade away. It sits on the house.

One thing worth clearing up straight away, because the names confuse people. The 650 is for inheritances. There are two sister forms: the Modelo 651, which covers gifts made during lifetime, and the Modelo 655, for the moment a life interest in a property ends — when someone was given the use of a property for life through an inheritance or a gift, and on their death the person who was waiting behind them becomes the full owner. If your situation is a gift rather than a death, you are on the wrong form.

The clock: six months, and when to ask for more time

The deadline is six months from the date of death. Not from the date you found out, not from probate in the UK, not from when the Spanish will surfaced. From the death itself.

Honestly, six months sounds generous until you are inside it. You need a death certificate, the Spanish certificate of last wills, the will itself or a declaration of heirs, a notarised deed of acceptance of the inheritance, and if any of those documents are British, they need the Hague Apostille, the international stamp that makes a British document valid for use in Spain, and a sworn translation. For a family doing this from Manchester or Surrey, with a Spanish notary in the middle, six months goes very fast.

There is an extension, and this is the part people learn too late. You can ask for a further six months, but the request has to go in within the first five months of the original deadline. Ask in month six and the answer is no, full stop. The request is made by the heirs, the executor or the estate's administrator, and if the office says nothing within a month, it counts as granted.

Now, the extension is not free time. Interest runs on the tax from the day the original six months ended until the day you actually file. So the extension buys you breathing room on the paperwork, not a holiday from the bill. Our standing advice to families abroad is simple: if you are in month three and the deed of acceptance is not yet signed, ask for the extension. Do not wait to see.

What happens if you file late

If the deadline passes and you file on your own initiative, before the Tax Agency comes asking, you pay a surcharge rather than a penalty. It starts at 1% and grows by another 1% for each complete month of delay. Once you are more than twelve months late, it becomes 15% plus interest running from that point on. Provided the tax itself was paid when you filed, or deferred with a guarantee, the surcharge is reduced by a quarter if you pay it promptly when it is issued.

Filing late voluntarily also shuts out the fines that would otherwise be possible. That distinction matters. If the Tax Agency formally chases you first, you are no longer in surcharge territory, and it gets more expensive and more adversarial. So even if the six months are long gone, the right move is almost always to file before they write to you, not after.

Where a non-resident files it, and it is not where you think

This is the single most common mistake we see, including from families who have done their homework. The house is in Jávea, so they contact the Valencian tax office. Wrong door.

When the heir is not resident in Spain, or the person who died was not resident in Spain, the inheritance tax is not handed over to the region. It stays with the State. You file the Modelo 650 with the national Tax Agency, specifically with the Oficina Nacional de Gestión Tributaria in Madrid, the national office that handles inheritance tax for non-residents. The regional office will simply turn you away, usually after you have queued.

The good news is that you do not need to go to Madrid. There are three ways to file: online with a digital certificate or Cl@ve, the Spanish government's login system, a half-way route where you complete the form online and it is stamped at the office, and filing on paper at the Madrid office itself. The online route can be done by the taxpayer, by one appointed representative acting for all the heirs, or by a professional registered with the Tax Agency filing on everyone's behalf, which is how we do it for our clients. Nobody flies anywhere. One detail if you live outside the EU or the European Economic Area: the Tax Agency will ask for proof of who represents you, so a power of attorney becomes part of the file.

(If the estate's main assets sit in the Basque Country or Navarre, different foral rules and offices apply — that is a separate conversation.)

The part almost nobody explains in English: your regional reductions survived Brexit

Here is the turn in the story, and it can be worth real money.

Each Spanish region sets its own inheritance tax reductions and allowances, and the difference against the State rules can be substantial. For years, non-residents were shut out of those regional rules and dumped into the State rules instead, which are usually less generous for close family. That was challenged in the European courts and then fought through the Spanish courts, and today the position is written plainly into the law: every non-resident heir can opt for the regional rules, whatever country they live in. Not just EU residents. A British heir after Brexit, an American heir, an Australian heir. All of them.

Which region's rules apply follows the case. If the person who died lived in Spain, in Valencia say, and you inherit from abroad, you can use the Valencian rules. If the person who died lived abroad and left assets in Spain, you use the rules of the region where the biggest share of the Spanish estate sits, which for most of our clients means the region where the house is.

Notice the strange shape of this: the form goes to Madrid, to the State office, but the numbers inside it can be calculated under Valencian rules. The Tax Agency itself confirms you can do both at once. Plenty of people, and honestly some professionals, still file under State rules out of habit, without ever checking whether the regional option leaves them better off. We wrote a full guide on inheritance of Spanish property by non-residents that goes deeper into this, including the court decisions that got us here.

If you want a feel for the numbers before speaking to anyone, our inheritance and gift tax calculator is built for exactly this situation.

What you actually pay Spanish tax on

If you live outside Spain, Spanish inheritance tax reaches only the assets located in Spain. The house on the Costa Blanca, the Spanish bank account, a Spanish life insurance payout. Your father's house in Kent and his ISA are not Spain's business. Heirs who live in Spain are taxed on the whole worldwide inheritance, which is a different conversation entirely, but as a non-resident your Spanish exposure has a fence around it.

That also frames the planning question. If you own property in Spain now, the shape of your will decides how hard all of this will be for your children later. A Spanish will that sits alongside your British one, and a properly made choice of law inside it, are the two cheapest pieces of inheritance planning that exist. We say that to clients while they are alive, because after a death the only tool left is the 650.

The documents the Tax Agency asks for

The file that travels with the Modelo 650 is not small. The Tax Agency's own list includes the notarised deed of acceptance of the inheritance, the death certificate, the certificate from the Spanish registry of last wills, and the will itself or, where there is no will, the declaration of heirs. Then the evidence for each asset: IBI receipts, the Spanish council tax bills, and title deeds for property, bank certificates showing balances at the date of death, vehicle papers, company shareholdings where they exist.

And the rule that catches every cross-border family: any document issued outside Spain, a UK death certificate, an English grant, needs the Hague Apostille and a sworn translation before the Tax Agency will accept it. The online filing system will tell you which documents are compulsory for your case and takes them as attachments, so this is genuinely a scan-and-upload exercise once the papers exist. Getting the papers to exist is the real work.

What we do, plainly

Our inheritance work for foreign families covers the whole path, not just the form at the end. We obtain the Spanish certificates, coordinate the notary for the deed of acceptance, deal with the Apostilles and translations, work out whether the regional or State rules leave you better off, prepare the Modelo 650, file it with the Madrid office electronically, and then finish the job that the tax filing exists to unlock: the property registered in your name, the bank account released.

Most of it is done remotely with a power of attorney, which is how the majority of our inheritance clients work with us, from the UK, Germany, the Netherlands and further away. The two offices, Moraira and Dénia, are there when you are here.

And if you are reading this early, in month one or two, with the six months barely started: that is the best possible moment to get help, and the extension request in month three or four is your safety net. The families who struggle are the ones who arrive in month seven.

A quick legal note before you go

Juan makes me include this, because a law firm has to. This article is general information, current as of August 2026. Inheritance tax in Spain depends heavily on the region, the family relationship, the values involved and the dates, so nothing here is advice on your estate, and reading it does not make you our client. The exact reductions and the final figures for your case are something your lawyer confirms against the current rules, not something to take from any article, including this one.

Sources

Every figure and deadline in this article was checked against the official consolidated texts on the day of writing. The table below is the receipt.