Buying Property Abroad With an Unmarried Partner or Friend, Joint Ownership and the Break-Up Trap (2026)

Published on: June 17, 2026

Plenty of advice exists on what happens to overseas property in a divorce. Almost none exists for the situation that's actually more common today: buying abroad with a partner you haven't married, or pooling money with friends or family to afford a place none of you could buy alone.

That's a problem, because the legal system that protects married couples, division of assets, spousal inheritance, court-supervised separation, simply doesn't apply to you. If you co-buy abroad without the right structure, you're exposed in three predictable ways: when one of you wants out, when one of you stops paying, and when one of you dies. This guide walks through each trap and how to close it before you sign.

Disclaimer: This is general information, not legal advice. Co-ownership and inheritance rules vary sharply by country, and several civil-law jurisdictions have rules that override what you write in a contract. Always engage an independent lawyer in the country of purchase before committing.

First decide how you'll hold the title, it changes everything

In most systems, two or more people can hold a property in one of two broad ways, and the choice has enormous consequences:

Joint ownership with survivorship (e.g. "joint tenants"). All owners hold the whole property together. If one dies, their share passes automatically to the survivors, bypassing a will. Good for couples who want the other to inherit automatically; dangerous for friends or unequal contributors, because it can override what each person intended to leave to their own family.

Ownership in defined shares (e.g. "tenants in common", civil-law indivision/copropriété). Each owner holds a stated percentage, 50/50, 70/30, whatever matches the money put in. When one dies, their share goes to their heirs, not the co-owners. This is almost always the right structure for friends, family or unequal contributors.

Civil-law countries (Spain, France, Portugal, Italy) have their own labels and defaults, and some attach rights and obligations you can't simply contract away. Getting the form of title right at the notary is more important than any side agreement.

Trap 1, one of you wants out

This is the most common rupture, and the most painful one to unwind. Without an agreement, your options when a co-owner wants to exit are limited and ugly: buy them out (if you can afford it and you agree on a value), sell the whole property (which the other may refuse), or, in many jurisdictions, go to court to force a sale of jointly held property, which is slow, expensive and adversarial.

The fix: a written co-ownership agreement (sometimes a declaration of trust) signed before purchase that spells out:

• Each owner's exact share and what each contributed.
• How a buy-out is valued (independent valuation? fixed formula?).
• A right of first refusal, the staying owner gets first option to buy the leaver's share.
• A timeline and process if no one will buy and the property must be sold.
• Who pays what for the mortgage, taxes, repairs and running costs, and what happens if someone stops paying.

Trap 2, one of you stops paying

If you co-sign a mortgage, the bank can usually pursue any co-borrower for the whole debt, not just their share. So if your co-owner loses their job or simply walks away, you can be left covering 100% of a loan you split 50/50, with your own credit on the line. Friends who "split everything down the middle" rarely plan for this.

The fix: address default explicitly in the co-ownership agreement, what happens to the non-paying owner's share, whether the paying owner accrues a claim against it, and an exit mechanism. And go in with eyes open: jointly liable means jointly liable for the full amount.

Trap 3, one of you dies (the inheritance trap)

This is the trap that catches unmarried couples hardest, and it's worst in civil-law countries with forced heirship. In places like France, and to varying degrees Spain, Portugal and Italy, a fixed portion of a deceased person's estate is legally reserved for their children or other relatives, regardless of what a will says, and regardless of an unmarried partner's wishes.

The brutal real-world outcome: an unmarried partner can find that on their loved one's death, the deceased's share of the home passes by law to the deceased's children or parents, people the survivor may now co-own a property with, or who can force its sale. Marriage often (not always) softens this; an unmarried partner usually has no automatic protection.

The fix(es):

• Hold title in a way that matches your intent (survivorship for couples who want automatic transfer; defined shares with clear wills for everyone else).
• In some countries, specific notarial structures exist for unmarried couples (for example, French tontine clauses) that pass a share to the survivor, but these have tax and flexibility trade-offs and must be set up at purchase.
• Make local wills covering the foreign property, drafted with awareness of forced-heirship rules. A home-country will alone is often not enough.
• Take independent local legal advice on whether EU succession rules (which can let you elect your home-country law) apply to your situation.

The friends-and-family version

Everything above intensifies when co-buyers aren't a couple. Friends and siblings usually want defined shares, not survivorship, you don't want your share of a Spanish villa passing to your friend instead of your own family if you die. And the "what if one of us wants out in three years" question is far more likely among friends than spouses. A co-ownership agreement isn't optional here; it's the entire point.

Frequently asked questions

Can an unmarried couple buy property abroad together?
Yes, almost everywhere. But you won't have the legal protections marriage provides, so how you hold title and what you agree in writing beforehand matters enormously, especially for what happens on a break-up or a death.

What happens to jointly owned property abroad if we split up?
Without an agreement, your options are to buy each other out, sell the whole property by mutual consent, or apply to a court to force a sale. A co-ownership agreement signed before purchase replaces that uncertainty with an agreed buy-out and exit process.

What happens to my share if my unmarried partner dies?
It depends on the title structure and the country. With survivorship, your share may pass to you automatically. But in civil-law countries with forced heirship, a deceased partner's share can be legally reserved for their children or parents, leaving an unmarried survivor exposed, which is why local wills and the right title structure are essential.

Should friends buy property abroad as joint tenants or tenants in common?
Almost always tenants in common (defined shares), so each person's share passes to their own heirs and contributions can be unequal. Pair it with a written co-ownership agreement covering exits, valuation and unpaid costs.

Do I need a separate will for property I own abroad?
Usually yes. A will drafted in your home country may not deal properly with foreign property or local forced-heirship rules. A local will, coordinated with your main estate plan, prevents conflicts and delays.

Why we map this for every market

Marriage comes with a built-in legal safety net that decides what happens on separation and death; co-buying without that net means you have to build it yourself, in writing, at the notary, before the keys change hands. Civil-law forced heirship makes that doubly true: the country can override your intentions unless you structure ownership deliberately.

JanusHermes works with independent local legal partners across 50+ countries, so co-buyers, married or not, couples or friends, can structure ownership correctly before they sign, not discover the gaps afterward. See also our guides to how divorce divides property by country, wills for foreign property and the EU Succession Regulation, and cross-border inheritance planning. Explore listings and country intelligence on JanusHermes.

Co-ownership, forced-heirship and inheritance rules vary sharply by country and change over time, and several jurisdictions override private contracts. This is general information for international buyers, not legal advice. Engage an independent lawyer in the country of purchase before committing.