Unmarried Couples Buying Property on the Costa del Sol — Legal Traps UK Buyers Must Avoid

More than half of UK couples buying property on the Costa del Sol are not married. Some are long-term partners who have chosen not to marry; others are engaged couples buying before the wedding; some are friends or family members purchasing together as an investment. Whatever the arrangement, Spanish property law treats unmarried co-owners fundamentally differently from how English law does — and the consequences of not understanding these differences can be financially devastating.

In England and Wales, unmarried couples typically buy property as "joint tenants," which means that if one owner dies, the property automatically passes to the surviving owner through the right of survivorship. It is simple, automatic, and requires no will or probate process. Many UK buyers assume the same principle applies when they buy in Spain. It does not.

This guide explains every legal issue that unmarried couples need to understand before purchasing property in Spain, from ownership structures and inheritance risks to registered partnerships and relationship breakdowns. If you are exploring the broader buying process, our step-by-step buying guide covers the full journey. For cost estimates, use our interactive property calculator.

Spain Does Not Recognise Joint Tenancy

This is the single most important thing to understand. Under Spanish law, there is no equivalent of the English "joint tenancy with right of survivorship." When two or more people buy property together in Spain, the ownership structure is always proindiviso — the Spanish equivalent of tenancy in common. Each owner holds a defined percentage share of the property (typically 50/50 for couples, but any split is possible), and each share is treated as a separate, independent asset.

What this means in practice:

• No automatic right of survivorship: When one co-owner dies, their share does not automatically pass to the other co-owner. Instead, it forms part of the deceased's estate and is distributed according to their will — or, if there is no will, according to the applicable succession law
• Each share can be sold, mortgaged, or gifted independently: In theory, one co-owner could sell their 50% share to a third party without the other co-owner's consent (though in practice, finding a buyer for a 50% share of a property occupied by the other co-owner is difficult)
• Each share is subject to inheritance tax independently: When one co-owner dies and their share passes to the surviving partner, the survivor must pay inheritance tax on the value of the share received — unless specific exemptions or reliefs apply

The proindiviso ownership structure is recorded in the escritura publica (public deed) at the notary and registered at the Registro de la Propiedad (Land Registry). The percentage split is stated explicitly. If no percentages are specified, Spanish law presumes equal shares.

Forced Heirship: The Hidden Danger

Spanish succession law includes a concept called herederos forzosos (forced heirs), which does not exist in English law. Under forced heirship rules, certain family members are automatically entitled to a share of the deceased's estate, regardless of what the will says. The forced heirs and their entitlements are:

• Children (and their descendants): Entitled to two-thirds of the estate. Of this two-thirds, one-third (the "legitima estricta") must be divided equally among all children, and the second third (the "mejora") can be distributed among the children in whatever proportions the testator chooses
• Parents (if there are no children): Entitled to one-half of the estate (or one-third if the deceased was married)
• Surviving spouse: Entitled to a usufruct (right of use) over one-third of the estate if there are children, one-half if there are only parents, or the full usufruct of the estate if there are neither children nor parents

Notice that an unmarried partner is not listed as a forced heir. Under Spanish succession law, your partner — regardless of how long you have been together, how many children you share, or how intertwined your finances are — has no automatic right to any part of your estate. If you die without a will, your share of the property will pass to your children, your parents, or your more distant relatives, in that order. Your partner could be left with no legal right to the home you shared.

How EU Regulation 650/2012 Changes Things for UK Nationals

The situation is complicated (and in some ways improved) by EU Succession Regulation 650/2012, commonly known as Brussels IV. This regulation allows individuals to choose the law of their nationality to govern their succession, rather than the law of their habitual residence. For UK nationals, this means you can specify in your Spanish will that English succession law (or Scots law, if applicable) should apply to your estate.

Under English succession law, there are no forced heirship rules. You are free to leave your property to whoever you choose — including your unmarried partner. This is a significant advantage for UK buyers, because it means you can effectively override Spanish forced heirship by making a Spanish will that elects English law as the governing law of succession.

However, this only works if you actually make a will. If you die without a will (intestate), the default position is that Spanish succession law applies to your Spanish assets — and Spanish succession law does not protect your unmarried partner. The importance of making a Spanish will cannot be overstated. We cover this in detail in our dedicated guide: Do You Need a Spanish Will? Forced Heirship Rules for UK Property Owners.

What Happens Without Proper Planning: A Worked Example

To illustrate the real-world consequences, let us consider two scenarios involving the same couple.

The Couple

James (52) and Sarah (49) are unmarried partners who have been together for 15 years. They have no children together, but James has two adult children from a previous marriage. They buy an apartment in Marbella for EUR 400,000, each owning 50% (proindiviso). The property is their holiday home; they remain UK tax resident.

Scenario A: James Dies Without a Spanish Will

James dies unexpectedly. He has a UK will leaving everything to Sarah, but he never made a Spanish will. His 50% share of the Marbella apartment (worth EUR 200,000) is governed by Spanish succession law because he did not elect English law in a Spanish will.

Under Spanish forced heirship rules, James's two children are entitled to two-thirds of his estate (the "legitima"). The remaining one-third (the "free disposal third") can be left to anyone — but since James's UK will may not be recognised as covering his Spanish assets in the same way, and there is no Spanish will, the distribution defaults to intestacy rules.

Under Spanish intestacy law, the entire estate passes to the children in equal shares. Sarah receives nothing.

The outcome:

• James's two children each inherit a 25% share of the property
• Sarah retains her own 50% share but now co-owns the property with James's children
• Sarah cannot sell the property without the children's consent
• The children can force a judicial sale (division of the thing held in common) if they want their money
• Sarah may need to buy out the children's shares to keep the property — requiring EUR 200,000 she may not have
• The children must pay Spanish inheritance tax on their shares (more on this below)

Scenario B: James Has a Spanish Will and Proper Planning

James makes a Spanish will before purchasing the property. The will states that English law shall govern his succession (per Brussels IV), and he leaves his 50% share to Sarah outright. He also registers as pareja de hecho (domestic partner) with Sarah in Andalusia.

James dies. Because the will elects English law, Spanish forced heirship does not apply. Sarah inherits the full 50% share as James intended. Because they are registered as pareja de hecho in Andalusia, Sarah benefits from the same inheritance tax reductions as a married spouse — meaning her inheritance tax bill is near zero (Andalusia provides a EUR 1,000,000 reduction for Group I and II beneficiaries, which includes registered domestic partners).

The outcome:

• Sarah inherits 100% of the property
• Inheritance tax: effectively zero (or near zero) thanks to the Andalusian regional reduction
• No forced sale, no negotiations with James's children over the property
• James's children can still inherit from James's UK estate via his UK will

The difference between these two scenarios is the difference between Sarah keeping her home and potentially losing it. The total cost of the planning that makes Scenario B possible is approximately EUR 300-600 (two Spanish wills plus the pareja de hecho registration). The cost of not doing it is potentially hundreds of thousands of euros and years of legal proceedings.

Registering as Pareja de Hecho in Andalusia

A pareja de hecho (registered domestic partnership or "de facto couple") is a legally recognised relationship status in Spain that provides many of the same rights as marriage, particularly for inheritance tax purposes. Registration is handled at the regional (autonomous community) level, so the rules vary between regions. In Andalusia — the region that includes the entire Costa del Sol — the process is governed by Ley 5/2002, de 16 de diciembre, de Parejas de Hecho.

Requirements for Registration in Andalusia

To register as pareja de hecho in Andalusia, you must meet the following requirements:

1. Both partners must be over 18 (or emancipated minors)
2. Neither partner can be married or registered as pareja de hecho with another person
3. The partners must not be related to each other by blood or adoption within certain degrees
4. At least one partner must be registered on the padron (municipal register) in an Andalusian municipality
5. Proof of the relationship: You must demonstrate that you have been living together in a stable relationship. This is typically done through one of the following:
   • A sworn declaration (declaracion jurada) before a notary stating that you have been in a stable, cohabiting relationship for at least two years, signed by both partners
   • Documentary evidence of at least two years of cohabitation (such as joint utility bills, joint rental contract, shared padron registration)
   • A joint declaration at the time of registration, without the two-year requirement, if accompanied by additional supporting documentation

Where and How to Register

Registration is made at the Registro de Parejas de Hecho de Andalucia, which is administered through the local Delegacion Territorial de la Consejeria de Igualdad, Politicas Sociales y Conciliacion. In practice, you begin the process at your local ayuntamiento (town hall) or through the Junta de Andalucia's offices.

The process involves:

1. Gathering documentation: NIE numbers for both partners, padron certificate, passport copies, sworn declaration or cohabitation evidence, and a certificate of civil status (certificado de estado civil) for each partner — obtainable from the Spanish Civil Registry or, for UK nationals, from the UK authorities with apostille and sworn translation
2. Submitting the application: File the application with the required documents at the relevant office. There is no registration fee (it is free), but you will incur costs for the notarised declaration and any translations
3. Processing: The registration is typically processed within one to three months. Once approved, you receive a certificate of registration (certificado de inscripcion en el Registro de Parejas de Hecho)

The Inheritance Tax Benefit

This is the key practical reason for registering. In Andalusia, registered domestic partners (parejas de hecho) are treated identically to married spouses for inheritance and gift tax purposes. They are classified in Group II of the inheritance tax scale, which means they benefit from:

• The EUR 1,000,000 reduction: Andalusia provides a reduction of up to EUR 1,000,000 on the taxable base for Group I and II beneficiaries (spouses, registered partners, children, parents). For most property inheritances on the Costa del Sol, this reduction effectively eliminates the inheritance tax liability entirely
• Lower tax rates: Group II beneficiaries pay the lowest inheritance tax rates (7.65% to 36.50% on the base, before the regional reduction)
• No multiplier surcharge: Group II beneficiaries are not subject to the "pre-existing wealth" multiplier that can increase the tax for more distant relatives or unrelated beneficiaries by up to 2.4 times

Without pareja de hecho registration, an unmarried partner is classified in Group IV (unrelated persons). Group IV beneficiaries receive no reduction, pay the highest effective rates, and are subject to the full multiplier surcharge. On an inheritance of EUR 200,000 (a 50% share of a EUR 400,000 property), the difference can be:

• Registered pareja de hecho (Group II): Approximately EUR 0 to EUR 2,000 (after the EUR 1,000,000 reduction)
• Unregistered partner (Group IV): Approximately EUR 30,000 to EUR 55,000 (no reduction, higher rates, multiplier surcharge)

This single registration can save tens of thousands of euros. For guidance on how inheritance tax interacts with other costs, see our costs and taxes guide.

Making Spanish Wills: Why Each Partner Needs a Separate Will

Spanish law does not permit joint wills (testamentos mancomunados) except in certain regions under foral law (Aragon, Navarra, and the Basque Country). In Andalusia, each partner must make a separate Spanish will. This is not optional — it is a legal requirement.

What Your Spanish Will Should Include

For unmarried couples, each partner's Spanish will should include the following:

1. Election of English law: A clear statement that the testator elects the law of England and Wales (or Scots law, as applicable) to govern their succession, pursuant to EU Regulation 650/2012 (Brussels IV). This overrides Spanish forced heirship
2. Specific bequest of the Spanish property: A clear identification of the property (address, cadastral reference, Land Registry details) and a statement of who should inherit it — typically the surviving partner
3. Substitute beneficiaries: Who should inherit if the primary beneficiary (your partner) predeceases you or is unable to inherit
4. Appointment of executor: Who should administer your Spanish estate. This is typically your Spanish lawyer
5. Usufruct provisions (optional): If you want to grant your partner the right to live in the property for their lifetime while preserving the bare ownership for your children or other heirs (see below)

The Interaction Between Spanish and UK Wills

A critical point that many lawyers overlook: your Spanish will and your UK will must be carefully coordinated to avoid one inadvertently revoking the other. A common mistake is to make a UK will that says "I leave all my worldwide assets to [partner]" and then make a Spanish will that covers your Spanish assets. If the UK will contains a general revocation clause ("I hereby revoke all previous wills"), it could potentially revoke the Spanish will.

The solution is straightforward:

• Your Spanish will should explicitly state that it covers only your assets located in Spain, and that it does not revoke any will made under another jurisdiction
• Your UK will should explicitly state that it covers only your assets located outside Spain (or your non-Spanish assets), and should not contain a blanket revocation clause
• Both wills should reference each other to avoid any ambiguity

The cost of making a Spanish will before a notary is typically EUR 100 to EUR 200 per person. Given what is at stake, this is a trivial expense. Your Spanish lawyer can draft the will, and you sign it at the notary during your purchase trip or via power of attorney.

The Usufruct Option: Lifetime Right of Use

A usufructo (usufruct) is a legal right that grants one person the right to use and enjoy a property for their lifetime (or a fixed period) while the ownership (nuda propiedad, or "bare ownership") belongs to someone else. This is a powerful estate planning tool for unmarried couples, particularly when there are children from previous relationships.

How It Works

In your will, you can leave your partner a usufruct over your share of the property — meaning they have the right to live in it, use it, and enjoy it (including renting it out and keeping the income) for the rest of their life. The bare ownership passes to your children or other chosen heirs. When the usufructuary (your partner) dies or voluntarily relinquishes the usufruct, the bare owners acquire full ownership.

Advantages

• Protects your partner: Your partner can remain in the home for life, regardless of what the bare owners want
• Protects your children's inheritance: The children (or other heirs) retain the underlying ownership and will eventually receive the full property
• Lower inheritance tax: The taxable value of the usufruct is calculated based on the usufructuary's age (roughly: 89 minus the age of the usufructuary, as a percentage of the property value, with a minimum of 10% and maximum of 70%). For a 49-year-old, the usufruct would be valued at approximately 40% of the property value. The bare ownership is valued at the remainder (60%). This means the inheritance tax for both the partner and the children is lower than if the full ownership passed to either party
• Avoids conflict: The legal framework is clear — the partner has the right to live there, the children have the right to eventual ownership. There is no ambiguity or need for negotiation

Disadvantages

• The usufructuary cannot sell the property: Because they do not own it, they cannot sell it or mortgage it without the bare owners' consent
• Maintenance obligations: The usufructuary is responsible for ordinary maintenance and repairs, while the bare owners are responsible for extraordinary repairs
• Potential relationship difficulties: If the surviving partner and the bare owners (e.g., children from a previous relationship) do not get along, the arrangement can be uncomfortable, particularly regarding decisions about the property

Extincion de Condominio: What Happens If the Relationship Ends

If an unmarried couple who co-own property in Spain separate, they need a mechanism to dissolve the co-ownership. Spanish law provides a process called extincion de condominio (extinction of joint ownership), which is significantly more tax-efficient than one partner buying out the other through a conventional sale.

How It Works

In an extincion de condominio, one co-owner transfers their share to the other co-owner. Instead of being treated as a property sale (which would attract Transfer Tax — ITP — at 7% in Andalusia), the transfer is treated as the dissolution of an existing co-ownership arrangement. This means it is subject only to Actos Juridicos Documentados (AJD — Stamp Duty on Documented Legal Acts) at a rate of 1.2% in Andalusia (as of 2026).

The tax saving is substantial. On a property valued at EUR 400,000 where one partner buys out the other's 50% share (EUR 200,000):

• Conventional purchase (ITP): EUR 200,000 x 7% = EUR 14,000
• Extincion de condominio (AJD): EUR 400,000 x 1.2% = EUR 4,800
• Saving: EUR 9,200

Note that the AJD is calculated on the total value of the property, not on the share being transferred. Even so, at 1.2%, it is significantly cheaper than the 7% ITP that would apply to a normal purchase.

Requirements for Extincion de Condominio

For the extincion de condominio to be valid and attract the lower AJD rate rather than ITP, the following conditions must be met:

1. There must be a genuine dissolution of co-ownership: One co-owner must receive the entirety of the other's share, resulting in a single owner. A partial transfer (e.g., one partner reducing from 50% to 30%) does not qualify
2. The transferring co-owner must be compensated: The co-owner giving up their share must receive fair compensation, which is typically the market value of their share. This can be paid in cash, by assuming the other's share of the mortgage, or by other means
3. The property must be indivisible: The property cannot be physically divided into separate units. For apartments and most houses, this condition is easily met — you cannot split an apartment in half
4. The transaction must be formalised in a public deed (escritura publica) before a notary

Capital Gains Tax Implications

The co-owner who transfers their share may also be liable for Capital Gains Tax on any increase in value since the original purchase. The CGT rate for non-residents (which includes most UK buyers) is 24% for non-EU nationals (post-Brexit). However, if the compensation received in the extincion de condominio exactly matches the original acquisition cost (i.e., no gain), then no CGT is payable. Professional advice is essential to structure this correctly.

Practical Checklist: Seven Steps Before Signing at the Notary

If you are buying property in Spain as an unmarried couple, complete the following steps before you sign the escritura de compraventa:

1. Decide and document the ownership percentages: Agree in writing what percentage each partner will own. This should reflect your respective financial contributions. If one partner is contributing 70% of the purchase price and the other 30%, consider a 70/30 split rather than the default 50/50. The percentages will be recorded in the escritura and are difficult to change later without triggering tax consequences
2. Make separate Spanish wills: Each partner should make a Spanish will that (a) elects English law as the governing law of succession, (b) specifically bequeaths their share of the Spanish property to the surviving partner (or uses a usufruct if children from a previous relationship need to be accommodated), and (c) does not revoke any existing UK will. Cost: EUR 100-200 per person. This can be done at the notary on the same day you sign the property purchase
3. Register as pareja de hecho in Andalusia: Begin the registration process as early as possible, ideally before the purchase. If you cannot complete the registration before buying (it takes one to three months), start the process immediately after. The inheritance tax benefits are retrospective — what matters is that you are registered at the time of death, not at the time of purchase. Gather your documentation early: NIE numbers, padron certificate, sworn declaration, and certificates of civil status
4. Create a co-ownership agreement (pacto de convivencia): This is a private contract between the partners that sets out the rules for the co-ownership. It should cover: who pays what portion of the mortgage, community fees, IBI (council tax), utilities, and maintenance costs; what happens if one partner wants to sell and the other does not; the process for valuation and buyout if the relationship ends; a right of first refusal (derecho de tanteo) giving each partner priority to buy the other's share before it can be offered to third parties; and arrangements for managing and insuring the property. This agreement is not registered at the Land Registry but is a binding private contract between the parties. Have it drafted by your Spanish lawyer
5. Coordinate your UK and Spanish wills: Ensure your UK solicitor and Spanish abogado communicate to avoid any conflict between the two wills. The UK will should explicitly exclude Spanish assets, and the Spanish will should explicitly cover only Spanish assets. Each should reference the other
6. Consider life insurance: A life insurance policy on each partner, with the other partner as beneficiary, can provide the funds needed for the surviving partner to buy out the deceased's heirs if necessary, or to cover inheritance tax, mortgage payments, and other costs. This is particularly important if there are children from previous relationships who may inherit the deceased's share under forced heirship (if English law is not properly elected) or under the terms of the will
7. Review the mortgage structure: If you are financing the purchase with a Spanish mortgage, ensure both partners are named on the mortgage and that the mortgage terms address what happens if one partner dies, becomes incapacitated, or wants to exit the arrangement. Some Spanish banks offer mortgage protection insurance (seguro de vida vinculado a la hipoteca) that will pay off the deceased's share of the mortgage, reducing the financial burden on the surviving partner. Review our UK buyers' page for more on mortgage options

Inheritance Tax Rates: Married vs Pareja de Hecho vs Unregistered Partner

To reinforce the importance of proper planning, here is a comparison of the inheritance tax position for a surviving partner inheriting a 50% share of a EUR 500,000 property (EUR 250,000) in Andalusia:

Married Spouse or Registered Pareja de Hecho (Group II)

• Taxable base: EUR 250,000
• Andalusian reduction for Group II: EUR 1,000,000
• Taxable base after reduction: EUR 0
• Tax payable: EUR 0

Unregistered Partner (Group IV — "Stranger")

• Taxable base: EUR 250,000
• Applicable reduction: EUR 0 (Group IV receives no reduction)
• Tax on EUR 250,000 at Group IV rates: approximately EUR 45,000 to EUR 60,000
• Multiplier surcharge (for Group IV with pre-existing wealth over EUR 402,678): up to 2.4x
• Tax payable: EUR 45,000 to EUR 80,000+ (depending on the surviving partner's pre-existing wealth)

The difference is stark. Registering as pareja de hecho costs nothing (the registration itself is free; the notarised declaration costs EUR 50-100). Not registering could cost your partner EUR 45,000 to EUR 80,000 in inheritance tax alone.

Frequently Asked Questions

Can we buy property in Spain as unmarried partners without any special arrangements?

Yes, you can buy property as unmarried co-owners without any additional formalities beyond the standard purchase process. Spanish law does not require you to be married or registered as pareja de hecho to co-own property. However, buying without proper planning (wills, pareja de hecho registration, co-ownership agreement) exposes both partners to significant financial and legal risks, as this guide has explained.

Does pareja de hecho registration in Andalusia give us any rights beyond inheritance tax?

Yes. Registered domestic partners in Andalusia have rights similar to married couples in several areas, including: the right to information about the other partner's health and hospital visits; certain social security and pension benefits; protection against domestic violence; and rights in respect of the family home. However, pareja de hecho does not create the same property regime as marriage — there is no "community of property" (sociedad de gananciales) unless specifically agreed in the pacto de convivencia.

We are both UK nationals and neither of us lives in Spain full-time. Can we still register as pareja de hecho in Andalusia?

Yes, but at least one partner must be registered on the padron in an Andalusian municipality. If you own property in Andalusia, you can register on the padron at that property's address even if you are not Spanish tax resident. Padron registration is simply a record of where you live or have a home; it does not affect your tax residency status.

What if we break up but can not agree on what to do with the property?

If you cannot agree on the division of the property, either co-owner can apply to the Spanish courts for a division judicial de la cosa comun (judicial division of jointly owned property). The court will typically order the property to be sold at auction, with the proceeds divided according to the ownership percentages. This is an expensive, slow, and often unsatisfactory outcome for both parties — which is why a well-drafted co-ownership agreement (pacto de convivencia) with clear dispute resolution mechanisms is so important.

Can my partner and I buy with different ownership percentages to reflect our different contributions?

Absolutely. There is no requirement for co-owners to hold equal shares. You can buy with any split — 60/40, 70/30, 80/20, or any other combination. The percentages should be stated in the escritura publica and should ideally reflect the actual financial contributions of each partner to avoid potential gift tax issues (if one partner is effectively gifting value to the other by agreeing to an equal split despite unequal contributions).

Summary and Next Steps

Buying property in Spain as an unmarried couple is entirely possible and thousands of UK couples do it every year. But the legal framework is fundamentally different from England, and the risks of not planning properly are severe — from your partner being cut out of their home by forced heirship to tax bills of tens of thousands of euros that could have been zero with a simple registration.

The essential actions are:

1. Understand that Spain only has tenancy in common (proindiviso) — there is no right of survivorship
2. Make separate Spanish wills electing English law and leaving your share to your partner
3. Register as pareja de hecho in Andalusia to access near-zero inheritance tax rates
4. Create a co-ownership agreement covering finances, maintenance, and separation scenarios
5. Coordinate your Spanish and UK wills to avoid conflicts
6. Consider life insurance to protect the surviving partner financially

The total cost of all this planning is approximately EUR 500 to EUR 1,000. The cost of not doing it could be EUR 50,000 to EUR 200,000 or more in inheritance tax, legal fees, and forced sales.

For more information about buying property on the Costa del Sol as a UK national, visit our UK buyers' page. To explore the full glossary of Spanish legal and property terms used in this guide, see our glossary. And for a complete walkthrough of the purchase process, visit our step-by-step buying guide.