Buying Property with Family Members: Co-Ownership Guide

Pooling resources to buy property with family members is an increasingly common strategy for getting into a home that would be hard to afford on your own, whether to live together, to rent out, or as a shared investment across generations. The key to making it work is not family trust, but putting in writing, from the start, how contributions are split, who manages the property, how recurring expenses are divided, and what happens if one of the partners wants to sell their share later or goes through a different financial situation than the others.

Why a written agreement is essential

Even if you're dealing with siblings, parents and children, or cousins, a verbal agreement leaves too many gaps when the unexpected happens: one of the partners loses their job and can't keep contributing, someone wants to sell before the others, or there's disagreement about renovating or renting out the property. A co-ownership contract or private agreement, ideally reviewed by a notary public (notario) or a specialized attorney, should spell out each person's ownership percentage based on what they contributed, how maintenance and the predial (property tax) are split on an ongoing basis, and a mechanism for resolving disagreements without permanently damaging the family relationship in the process.

Points the agreement should cover

Before signing any joint deed (escritura), sit down and define in writing at least the following to avoid future conflicts:

• Ownership percentage based on what each family member contributes to the down payment and initial costs.
• Who lives in the property, or how rental income is divided if it is rented to third parties.
• How the predial, maintenance, and major repairs are split over the following years.
• What happens if a partner wants to sell their share before the others or needs urgent liquidity.
• A mechanism for resolving disagreements, ideally with a neutral third party or an arbitration clause.
• What happens in the event of a family member's death or the inheritance of their share.

Options for structuring co-ownership

There are several legal ways to formalize a family partnership over a property, from having everyone appear directly on the deed (escritura) as co-owners with defined percentages, to setting up a sociedad civil (civil partnership) or a private trust (fideicomiso) that formally owns the property while each family member holds a stake within that structure. The first option is simpler and cheaper for a small number of partners, while the second makes administration easier when many people are involved or when you want to bring new family members in and out over time without amending the deed each time.

Frequently asked questions

Do we need a notary public to buy property with family members?

The property deed (escritura) always goes through a notary public (notario), but it's also a good idea to formalize an additional agreement among the co-owners that details the internal rules for use and exit, ideally with complementary legal advice.

What happens if a family member stops paying their share of the mortgage?

It should be provided for in the agreement: some families agree that the others will temporarily cover that share in exchange for adjusting the ownership percentage, while others prefer to define specific penalties in writing.

Can several family members get a single mortgage together?

Some banks allow joint loans with more than one borrower, although the requirements and limits on the number of participants vary by institution, so it's worth comparing options before applying for the loan.