Two wills, one strategy. We draft reciprocal Spanish wills for married couples, civil partners and unmarried partners so the survivor inherits cleanly, the children are protected at second death, and Spanish inheritance tax is handled as a unit rather than twice.
Mirror wills are two separate wills — one for each partner — drafted so they read as a matched pair. In a Spanish mirror-will setup, each testator leaves their Spanish estate to the other on first death, and to the agreed beneficiaries (usually the children, sometimes grandchildren or a trust-equivalent structure) on second death. Crucially, both documents are coordinated on the single issue that derails most expat couples: the Brussels IV election. Both partners elect their national law, so the same succession rules apply to both estates, and the survivor is not forced to deal with two different legal systems in the same family.
Couples come to us because they want certainty for the one left behind. They have watched friends go through probate in Spain with no local will, no coordinated strategy, and property frozen for a year or more while lawyers reconstruct intentions from UK wills drafted decades earlier. Mirror wills remove that risk. They also give couples a structured way to talk about second-death planning — what happens when both are gone, which children inherit, how to handle children from a previous relationship, and whether a usufructo (life interest) makes sense for the survivor.
This page explains how mirror wills work in Spain, when they are the right choice, where they fall short for blended families, and how Platinum Legal Spain drafts them. If you already know you want mirror wills, book a couples consultation and we will send you the intake pack for both partners.
Some jurisdictions recognise a true joint will — a single document signed by both partners. Spain does not. Under Article 669 of the Spanish Civil Code, each testator must make their own will in their own document. What English-speaking clients call a "joint will" or "mutual will" is always, in Spain, a pair of mirror wills that happen to reflect identical intentions. This is a legal structure, not a limitation: it means each partner retains full freedom to amend their own will later (for example, after the first death) without requiring consent from anyone else.
That last point matters. Mirror wills are not binding contracts between partners in Spanish law. If your partner dies first and you inherit the Spanish estate, you can change your will the following year and redirect assets however you wish. Couples who want legal force behind the second-death intentions — "whoever survives must leave the estate to these specific children" — need a different structure, usually handled through lifetime gifts, property ownership structures, or a usufructo/nuda propiedad split rather than through the will itself.
Before we draft, we walk each couple through these four decisions. Everything else in the will follows from them.
Does the survivor inherit the Spanish assets outright, or only a life interest (usufructo) with the children taking bare ownership (nuda propiedad)? Usufructo can reduce second-death tax significantly.
We model both outcomesBoth partners elect the law of their nationality. For British couples this means England & Wales, Scotland, or Northern Ireland. Elections must match or the wills create conflict on second death.
We align both willsBlended families are the single biggest reason mirror wills fail. If either partner has children from before, you need protection clauses the survivor cannot later override.
We build safeguardsMost expat couples restrict their Spanish mirror wills to Spanish assets, leaving their UK or home-country wills to handle the rest. We confirm the two wills do not contradict each other.
We coordinate with UK counselSpain does not use executors the way the UK does. We name a contador-partidor only where the estate is complex — otherwise the heirs administer directly under our supervision.
Simpler by defaultBoth partners sign at the same notary, usually on the same day, in separate documents. We arrange the notary appointment, the sworn translator if needed, and the Registro Central registration.
Single appointmentBoth partners complete a shared intake covering assets, children, previous marriages, and second-death intentions. We identify conflicts before drafting.
We draft both wills in parallel, in Spanish, with the Brussels IV election and beneficiary logic matched. Each partner gets their own document but the two are checked against each other clause by clause.
Both partners attend the notary together. The notary reads each will to each testator, confirms capacity and intent, and signs. Two notarial deeds issued the same day.
Both wills are registered at the Registro General de Actos de Última Voluntad in Madrid. Copies are delivered to both partners; originals remain with the notary.
Mirror wills work best when both partners share a single beneficiary logic and trust each other to hold the line after the first death. That usually means a long-standing couple with joint children and no meaningful friction over inheritance. For those couples, mirror wills are the simplest, cleanest, cheapest route: two documents, one notary visit, one coordinated strategy.
They also work for couples where one partner has significantly more assets than the other, provided the larger estate is happy to pass outright to the survivor. We often see this in retirement couples where one partner holds the Spanish property purchased before the relationship. Mirror wills formalise the intention that the property passes to the survivor, then to the joint children.
There are three situations where we advise against plain mirror wills and propose an alternative:
If either partner has children from a previous marriage or relationship, plain mirror wills give the survivor total freedom to redirect the combined estate to their own bloodline after the first death. We have seen this happen. The fix is either a usufructo structure (survivor gets a life interest, children from the first marriage get bare ownership locked in immediately) or, in more complex cases, a lifetime property restructure so the will itself is less load-bearing.
If one partner owns the Spanish property outright and the other owns very little, a straight mirror-will structure concentrates all the Spanish IHT at the survivor's eventual death. A split-ownership or usufructo model can halve that exposure by moving some of the tax event to the first death, where the spousal reductions are larger in most regions.
Spanish inheritance law treats unmarried partners much less favourably than spouses. Mirror wills alone will not fix the tax position. We pair the mirror wills with a registered pareja de hecho where the region allows, and we sometimes restructure property ownership to reduce what passes through the estate at all.
For expat couples, the single most important clause is the Brussels IV (EU Regulation 650/2012) election. Both partners must elect the law of their nationality to their Spanish estate, or Spanish law — including forced heirship — applies by default to the tax residents. In mirror wills, we check that both elections point to compatible systems. A British-British couple elect English law (or Scots/NI if domiciled there). A British-Irish couple elect their respective laws, which are compatible in outcome. A British-Spanish couple cannot both elect the same law — the Spanish national is stuck with Spanish succession rules — so the drafting has to reflect that asymmetry rather than pretending it away.
We also draft the election in terms that survive post-Brexit. The UK is no longer in the EU, but the Brussels IV election still works because it is a Spanish regulation applied by Spanish notaries, and Spain continues to honour elections to the law of any third-country national. The British expats will guide covers this in full.
We quote mirror wills as a couple package — a single fixed fee for both documents, drafted in parallel, signed at one notary appointment. That is usually the most efficient way to structure the engagement because most of our time is in the coordinated intake and the bilingual drafting, not in typing the second document. Notary fees and Registro Central registration are separate and depend on the notary's tariff; we quote a realistic range up front and confirm exact figures once the notary is booked.
For couples who need the usufructo/nuda propiedad structure or a blended-family solution, the fee is higher because the drafting is more complex and we usually build in a lifetime property review. We quote that too, on a fixed-fee basis, after the initial consultation.
Two wills that work as a pair, drafted in Spanish, aligned to your national law, registered in Madrid — ready the day you sign at the notary.
Book a Couples ConsultationIf one partner has a UK will and the other does not, or if the two Spanish wills contradict on Brussels IV, the survivor ends up arguing about which law governs — in English to the UK solicitor and in Spanish to the notary. Mirror wills remove that fight entirely.
Spanish inheritance tax is paid by each beneficiary on their share. Mirror wills let us model the tax position across both deaths and structure beneficiary shares to minimise the total family bill, not just the first-death bill.
Mirror wills make the second-death intention explicit. Even though the survivor can legally change their will later, the written record of joint intention is a strong anchor that reduces family disputes later on.
Two partners, two wills, one notary visit, one registration fee cycle. Operationally simpler than drafting them months apart and cheaper than doing them separately.
The biggest single protection for expat couples in Spain is the Brussels IV election. Drafting both wills together is the only way to guarantee the election matches on both sides.
Mirror wills in Spain are not mutually binding. Each partner retains full freedom to update their own will at any time. That flexibility is a feature, not a bug — but it is why blended families need extra structural protection beyond the will itself.
Spanish succession law gives us a very useful tool: the usufructo. A testator can leave the life interest in an asset to one person (usually the surviving spouse) and the bare ownership to another (usually the children), with the two reuniting on the death of the life tenant. For expat couples this produces three benefits at once.
First, it gives the survivor full use of the Spanish property for the rest of their life — they can live in it, rent it out, even move out and let it. Second, it locks in the children's entitlement on the first death, so the survivor cannot later redirect the property to someone else. Third, it splits the tax event: the children pay a small amount of IHT on the bare ownership at the first death (on a reduced valuation, because a life interest has been subtracted) and the survivor pays nothing on the life interest. When the survivor dies, the life interest extinguishes and the children consolidate full ownership with minimal further tax.
Usufructo is the default structure we recommend for blended families and for couples with significant Spanish property. It is slightly more complex to draft, but the tax saving across both deaths usually more than covers the additional drafting cost in the first year.
Unmarried partners face a very different Spanish tax position. They fall outside the favourable Group II spouse category and, in most regions, are treated as Group IV (unrelated beneficiaries) unless they register as a pareja de hecho. The registration works in most regions (Andalusia, Valencia, Catalonia, Madrid and others all have registers) and promotes the survivor back into something close to spouse treatment for IHT purposes.
Mirror wills for unmarried partners therefore usually come bundled with a pareja de hecho registration and, in some cases, a property restructure so that the surviving partner already owns at least half the Spanish property in their own name before any inheritance event. This is more planning work than a standard married-couple mirror will, and we flag it at the intake stage so nobody pays for a will that will not actually achieve the tax position they expected.
A couple with mirror wills dies in the order most people expect (not always the case, but most often). The survivor contacts us. We request the death certificate, obtain the Certificado de Últimas Voluntades from Madrid within 15 days of the death, get a certified copy of the will from the notary's archive, and open the aceptación de herencia at a notary. If the deceased was tax-resident in Spain, the Modelo 650 has to be filed within six months (extendable by six more on application). Spanish property is then re-registered into the survivor's name at the Registro de la Propiedad.
With mirror wills in place, this process usually takes 3 to 5 months end-to-end. Without a Spanish will, the same process regularly takes 12 to 18 months because the UK probate grant has to be obtained first, apostilled, sworn-translated, and accepted by the Spanish notary before anything can move. Mirror wills save the survivor roughly a year of being unable to sell, remortgage or fully use the Spanish property.
Clients sometimes think mirror wills means identical documents. In practice, the two wills must name each other correctly — so the wording is mirrored, not copied. Copy-paste drafting creates circular references that confuse the notary.
One partner elects English law, the other forgets and defaults to Spanish. On second death the survivor's estate is then subject to forced heirship even though the couple thought they had opted out.
Plain mirror wills give the survivor freedom to redirect the whole estate. For blended families, this is usually the exact opposite of what both partners said they wanted.
Unmarried partners sign mirror wills without registering the partnership, then discover on first death that the survivor is taxed as an unrelated beneficiary and loses half the estate to inheritance tax.
Most couples keep a UK will for UK assets. If the Spanish mirror will says "all my worldwide assets" rather than "my Spanish assets", the two wills collide. We scope the Spanish wills narrowly and check against the UK documents.
Mirror wills need reviewing after marriage, divorce, the birth of a child, a property purchase, or the death of a named beneficiary. Couples often sign once and forget — we book a free three-yearly review reminder for every couples client.
Straightforward mirror wills electing English (or Scots/NI) law with the survivor inheriting outright and the children at second death.
Usufructo structures protecting children from previous marriages while giving the survivor full lifetime use of the property.
Mirror wills paired with pareja de hecho registration and, often, joint-ownership restructure of the Spanish property.
Brussels IV elections to Irish or NI law, with the two systems' intestacy rules coordinated inside the mirror drafting.
British-American, British-Dutch, Irish-German. Each partner elects their own national law — we check the two elections do not collide on the same asset.
Spanish mirror wills scoped narrowly to the Spanish estate, coordinated with existing UK wills so the two documents cover complementary assets.
One intake, two matched wills, one notary appointment, one registration. That is the whole job — and it is how couples in Spain build a real estate plan.