Buying Cabo Property as an Unmarried Couple: Legal Structures That Protect Both Partners

Mexico Does Not Default-Protect Unmarried Partners

In many US states, unmarried couples who buy property together have some legal fallback — tenancy in common, joint tenancy, or state-specific partnership provisions. In Mexico, none of that exists for foreign buyers. If you buy a property through a fideicomiso with your unmarried partner, the trust names one beneficiary. If the relationship ends, the unnamed partner has no automatic claim to the property — regardless of who contributed what to the purchase price.

I have seen this go badly. A couple buys a $600K condo together, splits the down payment 50/50, and puts one name on the fideicomiso because the notario did not explain the options. Two years later, they split. The named beneficiary keeps the property. The other partner has to sue in Mexican court to recover their contribution — a process that can take years and costs more in legal fees than the recovery is worth.

This is entirely preventable.

Key Takeaways

• Mexican law provides no default property protections for unmarried couples — foreign or Mexican. The fideicomiso names a beneficiary, and that person controls the property.
• Both partners can be named as co-beneficiaries in a fideicomiso, each with a defined percentage interest (e.g., 50/50, 60/40).
• An SA de CV with each partner as a shareholder provides corporate-level co-ownership with clear share percentages.
• A separate co-ownership agreement (convenio de copropiedad) should define buyout procedures, exit provisions, and what happens if one partner dies or wants out.
• Same-sex couples have the same legal options — Mexico recognizes same-sex marriage federally, and the structures work identically.

Option 1: Co-Beneficiaries in the Fideicomiso

The simplest approach is to name both partners as co-beneficiaries in the fideicomiso. This is the equivalent of joint tenancy — both names are on the trust, each with a defined percentage interest.

How It Works

• The fideicomiso application names both partners as beneficiaries
• The trust document specifies each partner's percentage (50/50, 60/40, etc.)
• Both partners must consent to any sale, refinancing, or major modification
• Each partner names their own substitute beneficiaries (who inherits their share if they die)

Pros and Cons

• Pro: Simple and inexpensive — adds minimal cost to the standard fideicomiso setup ($2,000–$4,000 total).
• Pro: Both partners have their name on the property and cannot be unilaterally removed.
• Con: No built-in buyout mechanism if the relationship ends. Both parties must agree on what to do, or go to court.
• Con: Dual consent requirement can create deadlock — if one partner refuses to sell, the property is stuck.

Option 2: SA de CV With Defined Shares

For couples who want more structure, forming an SA de CV with each partner as a shareholder provides corporate-level co-ownership.

How It Works

• Form a Mexican SA de CV with both partners as shareholders
• Share percentages reflect each partner's contribution
• Corporate bylaws (estatutos) define decision-making authority, buyout procedures, and dissolution provisions
• The corporation — not either partner individually — holds the property

Pros and Cons

• Pro: Corporate bylaws can include detailed buyout provisions — right of first refusal, formula-based pricing, and forced-sale triggers.
• Pro: Transfer of ownership is a share sale, not a property transfer — cleaner and less expensive if one partner wants out.
• Pro: Works well if both partners plan to rent the property and want tax deductions.
• Con: Higher setup cost ($2,000–$5,000) and significantly higher ongoing costs ($3,000–$8,000/year in accounting and compliance).
• Con: Overkill for a single vacation property with minimal rental income.

The Co-Ownership Agreement: Essential Regardless of Structure

Whether you use a co-beneficiary fideicomiso or an SA de CV, you need a separate co-ownership agreement (convenio de copropiedad). This is a private contract between the partners that addresses what the trust document or corporate bylaws may not:

• Contribution record: Who paid what — down payment, closing costs, renovations, ongoing maintenance. If the relationship ends, this is the basis for equitable division.
• Expense sharing: How are ongoing costs split — HOA fees, predial, insurance, utilities, maintenance?
• Usage schedule: Who uses the property when? Particularly important for a vacation property where both partners may not be there simultaneously.
• Buyout provisions: If one partner wants out, does the other have the right of first refusal? At what price — appraised value, original purchase price plus improvements, or a formula?
• Forced sale trigger: If neither partner can buy the other out, when does the property go on the market? What happens to the proceeds?
• Death provisions: What happens if one partner dies? Does the surviving partner have first-refusal rights before the deceased partner's heirs take their share?

Same-Sex Couples: Same Structures, Same Protections

Mexico federally recognizes same-sex marriage, and Baja California Sur has recognized it since 2017. For same-sex couples who are legally married, all the protections of married-couple property ownership apply — including spousal rights in a fideicomiso, inheritance provisions, and community property (if applicable).

For same-sex couples who are not legally married, the co-ownership structures above work identically to those for heterosexual unmarried couples. The fideicomiso does not distinguish between same-sex and different-sex co-beneficiaries. The SA de CV's corporate structure is entirely gender-neutral.

Practical Advice From Experience

• Have the awkward conversation before closing. Buying property together is a financial commitment comparable to marriage. Discuss what happens if you split up, what happens if one person wants to sell and the other does not, and who gets to use the property during peak season. Having this conversation while you are happy is much easier than having it while you are not.
• Hire a bilingual attorney who has handled co-ownership. Your notario handles the transaction mechanics. A separate attorney should draft the co-ownership agreement. They should be fluent in both Mexican property law and the US/Canadian legal context the buyers are coming from.
• Keep financial records. Document every contribution — wire transfers, renovation payments, furniture purchases. If the co-ownership ever needs to be unwound, clean financial records make the process dramatically faster and less contentious.
• Consider title insurance. Title insurance protects both co-owners against title defects, liens, or encumbrances that predate the purchase. It is an additional layer of protection that benefits both partners equally.