Buying Property in Spain as an Unmarried Couple: Legal Options and Risks

Buying property together is a significant commitment for any couple, but for unmarried partners purchasing in Spain, the legal landscape is notably different from the UK. Spain does not automatically recognise cohabiting partners in the way that many people assume, and the absence of marriage creates real legal vulnerabilities around ownership, separation, and inheritance.

This guide explains the co-ownership structures available in Spain, how to protect both partners' interests, what happens if the relationship breaks down, and how inheritance law affects unmarried couples. Getting the legal framework right at the point of purchase can prevent devastating consequences later.

How Spanish Property Ownership Works for Couples

When two or more people buy property together in Spain, the ownership is registered as "proindiviso" (co-ownership in undivided shares). Each owner holds a percentage share of the whole property, not a specific physical part of it. Unlike in England and Wales, Spain does not distinguish between "joint tenants" and "tenants in common" in the same way.

Key Principles of Spanish Co-Ownership (Proindiviso)

• Each co-owner has a defined percentage share (e.g., 50/50, 60/40, 70/30)
• Each co-owner can sell, mortgage, or bequeath their share independently (though the other co-owner has a pre-emptive right to buy)
• No co-owner can be forced to remain in co-ownership indefinitely. Any co-owner can demand dissolution (division de la cosa comun), which may mean forcing a sale
• Decisions about the property (maintenance, improvements, rental) require the agreement of co-owners holding a majority share

The shares you register in the escritura (title deed) at the time of purchase are what matter legally. If you register 50/50 but one partner actually paid 80% of the price, the legal position is 50/50 regardless. Getting the shares right from the start is essential.

Choosing the Right Ownership Split

The most important decision is what percentage each partner will own. There are several approaches:

Equal Shares (50/50)

The simplest option and appropriate when both partners are contributing equally to the purchase price, mortgage, and ongoing costs. This is the default assumption many couples make, but it can be unfair if contributions are unequal.

Proportional to Contribution

If one partner is contributing more to the deposit, purchase price, or mortgage, you can register shares that reflect the actual financial input. For example, if Partner A pays EUR 180,000 and Partner B pays EUR 120,000 of a EUR 300,000 property, you register 60/40.

This is straightforward at the point of purchase but becomes more complicated over time as mortgage payments, renovations, and running costs shift the balance of contributions.

Sole Ownership with Occupancy Agreement

One partner buys and owns the property outright, and the other partner has a contractual right to occupy (or not). This avoids co-ownership complications entirely but leaves the non-owning partner with no property rights. A private agreement can set out what happens to the non-owner's financial contributions if the relationship ends.

The Critical Importance of a Cohabitation Agreement

Spanish law does not provide the same protections for unmarried couples as for married ones. There is no equivalent of England's Trusts of Land and Appointment of Trustees Act (TOLATA), and Spanish courts will not generally look behind the registered ownership to assess "fairness" or implied trusts.

A cohabitation agreement (convenio de convivencia or pacto de pareja de hecho) is a private contract between you and your partner that sets out:

• The financial contributions each partner is making (deposit, mortgage payments, running costs)
• How the property is owned and in what shares
• What happens if the relationship ends (who stays, how the property is sold or one partner buys the other out, timeline)
• How improvements or renovations are treated (do they change the ownership split?)
• How ongoing costs are shared
• What happens if one partner dies (this is separate from a will but can complement it)

This agreement should be prepared by a Spanish lawyer and, ideally, signed before a notary to give it greater legal weight. The cost is typically EUR 500 to EUR 1,500, which is modest insurance against a potential dispute that could cost tens of thousands of euros.

What Happens If You Split Up

This is the scenario nobody wants to think about when buying together, but it is the scenario where legal planning matters most. Without a cohabitation agreement, the following rules apply:

If You Agree

The simplest outcome: you agree to sell the property and split the proceeds according to your registered shares, or one partner agrees to buy out the other. You will need a new escritura (deed of transfer), which involves notary fees, Land Registry fees, and potentially transfer tax (ITP) on the transaction.

If You Disagree

Under Article 400 of the Spanish Civil Code, any co-owner can demand dissolution of the co-ownership at any time. If agreement cannot be reached, either party can apply to a Spanish court for a judicial sale (venta judicial). The court will order the property sold at auction and the proceeds divided according to the registered shares.

Judicial sales are slow (12 to 24 months), expensive (legal fees, court costs, and auction commissions), and typically achieve below-market prices. The property often sells for 60-70% of its market value at judicial auction. Both parties lose.

This is why a cohabitation agreement that includes a clear exit mechanism (buy-out right of first refusal at independently appraised market value, for example) is so valuable.

Mortgage Complications

If you have a joint mortgage, separation does not release either partner from the mortgage obligation. The bank lent to both of you, and both of you remain liable for the full amount until the mortgage is repaid or formally novated (transferred to one party). If one partner stops paying, the other is on the hook for the full amount.

Options for dealing with the mortgage on separation:

• Sell the property and repay the mortgage from the proceeds
• One partner takes over the mortgage (requires bank approval, which is not guaranteed, and the remaining partner must qualify for the mortgage alone)
• Continue paying jointly while the property is sold (requires cooperation)

Inheritance: The Hidden Risk for Unmarried Partners

This is where Spanish law creates the most serious vulnerability for unmarried couples. Under Spanish forced heirship rules:

• Unmarried partners have no automatic inheritance rights. If your partner dies without a will leaving you their share of the property, you inherit nothing. Their share passes to their children, parents, or other family members under intestacy rules
• Even with a will, forced heirship rules reserve two-thirds of the estate for children. If your partner has children (from any relationship), they are legally entitled to those portions, potentially leaving you with only one-third of your partner's share — or less
• The Brussels IV election (choosing English law) can avoid forced heirship, but it must be explicitly stated in a Spanish will

The nightmare scenario: You and your partner own a property 50/50. Your partner dies without a Spanish will. They have two children from a previous relationship. Under Spanish intestacy, the children inherit your partner's 50% share. You now co-own the property with your late partner's children, who may want to sell. You could be forced out of your home.

The solution is straightforward but must be done in advance:

1. Both partners make Spanish wills leaving their share to the other partner
2. Both wills include the Brussels IV election for English law to override forced heirship
3. Both partners are aware that if they have children, the children may still challenge the will under Spanish law (though the Brussels IV election significantly strengthens the surviving partner's position)

Read our detailed guide on Spanish wills for the full process and costs.

Inheritance Tax for Unmarried Partners

Spanish inheritance tax rates vary depending on the relationship between the deceased and the heir. Spouses and children benefit from substantial reductions in Andalusia (up to 99% reduction for estates up to EUR 1 million per heir). Unmarried partners may or may not qualify for the same reductions, depending on whether they are registered as a pareja de hecho (civil partnership).

Heir Category	Tax Group	Andalusia Reduction (2026)
Spouse	Group II	Up to 99% for estates under EUR 1M
Registered civil partner (pareja de hecho)	Group II (same as spouse)	Up to 99% for estates under EUR 1M
Unregistered unmarried partner	Group IV (stranger)	No reduction
Children	Group I/II	Up to 99% for estates under EUR 1M

The difference is enormous. An unregistered partner inheriting a EUR 200,000 share could face a tax bill of EUR 30,000 or more, while a registered partner or spouse would pay almost nothing in Andalusia.

If you live in Andalusia (or plan to), consider registering as a pareja de hecho at the Junta de Andalucia. Requirements include being over 18, not being married to anyone else, proof of cohabitation (empadronamiento at the same address), and a formal declaration. The registration process typically takes a few weeks and costs very little.

Mortgage Considerations for Unmarried Couples

Spanish banks will lend to unmarried couples jointly, applying the same criteria as for married couples. However, be aware of these points:

• Joint and several liability: Both partners are fully liable for the entire mortgage, not just their share. If one partner defaults, the bank pursues the other for the full amount
• Income assessment: The bank considers both incomes when determining affordability, which means you may qualify for a larger mortgage jointly than either could alone
• Ownership split vs mortgage split: You can own the property 60/40 but the mortgage is 100% joint. The bank does not care about your ownership split; it cares about getting repaid
• Life insurance: Most Spanish mortgage lenders strongly encourage (and some require) life insurance policies. For unmarried couples, ensure the policy pays out to your partner so they can maintain mortgage payments if you die

Practical Checklist for Unmarried Couples Buying Together

1. Agree the ownership split before making an offer. This should reflect actual financial contributions
2. Have a cohabitation agreement drawn up by a Spanish lawyer. Cover exit mechanisms, cost sharing, and buyout procedures
3. Both make Spanish wills leaving your property share to each other, with the Brussels IV election for English law
4. Consider registering as a pareja de hecho in Andalusia for inheritance tax benefits
5. Understand the mortgage implications of joint liability
6. Keep records of all financial contributions (bank transfers, mortgage payments, renovation costs) in case of future dispute
7. Review your arrangements if circumstances change (children, marriage, significant changes in financial contributions)

Next Steps

1. Discuss ownership structure and exit planning honestly with your partner before you start viewing properties
2. Instruct a Spanish lawyer who is experienced with cross-border co-ownership
3. Read our guide on inheritance law in Spain for the full picture on succession planning
4. Join the MUNDO Buyer Club to get matched with legal professionals who specialise in advising UK couples buying on the Costa del Sol