Prescripción positiva: adverse possession risk on Mexican property

There is a Mexican legal concept that surprises foreign owners more than any other: someone who is not the registered owner of a property can, under the right conditions, become its legal owner simply by possessing it long enough. This is prescripción positiva (positive prescription, Mexico’s version of adverse possession). It is not a scam or a loophole; it is a legitimate part of civil law across Mexican states, designed to reward those who use and care for land and to resolve long-standing possession. But for an absentee owner, particularly a foreigner who visits a few weeks a year, it is a genuine risk worth understanding and defending against.

This guide explains how prescripción works, the timelines that trigger it, and the concrete steps that keep your title bulletproof.

What prescripción positiva actually requires

An occupant does not acquire ownership just by squatting for a while. Mexican civil codes require the possession to meet several tests, held continuously for a defined period. The possession must generally be:

• Peaceful (pacífica): acquired and held without violence.
• Continuous (continua): uninterrupted over the required years, not sporadic.
• Public (pública): open and visible, not concealed.
• As an owner (a título de dueño): the occupant treats the property as their own, paying property tax, maintaining it, being known locally as the owner.

Only when all of these hold, for the full statutory period, can the possessor petition a court to be declared owner and eventually register the property in their name.

Good faith versus bad faith: the two timelines

The single most important variable is whether the possessor acted in good faith or bad faith, because it changes how long they must possess the property.

• Good-faith possession (posesión de buena fe): the occupant had a plausible legal basis to believe they owned it, for example a flawed deed or a genuine document that later proved defective. The prescription period is typically shorter, commonly 5 years.
• Bad-faith possession (posesión de mala fe): the occupant knew they had no valid title, for instance a pure squatter. The period is longer, commonly 10 years.

Exact periods vary by state civil code, and some situations extend the clock, but the 5-year / 10-year split is the standard frame. The lesson for owners is stark: an occupant with even a colorable claim to good faith can reach ownership in as little as five years of unchallenged possession.

Why absentee foreign owners are exposed

Prescripción rewards visible, continuous use, which is precisely what an absentee owner cannot demonstrate. The risk scenarios are predictable.

• A caretaker or neighbor occupies a rarely-visited lot, pays the property tax, and after years claims to have possessed it “as owner.”
• A boundary encroachment, where a neighbor’s structure or fence quietly annexes part of your land and, over the statutory period, they claim that strip.
• A defective prior deed in the chain of title gives an occupant a good-faith basis, shortening the clock to five years.
• An unregistered purchase, where a property was bought informally and never recorded, leaving the paper owner and the real occupant out of alignment.

Distance and inattention are the enemy. The law is not looking to punish you, but it will favor the person who was present, visible, and acting like the owner when you were not.

How to protect yourself: registered title first

The strongest single defense is registered, clean title. A property recorded in your name in the Public Registry of Property (Registro Público de la Propiedad), with a properly formalized escritura (deed) before a notary (notario público), is far harder to prescribe against, and gives you standing to act quickly if anyone tries.

• Insist on a registered deed in your name, not a private contract or an unregistered assignment.
• Order a title search (certificado de libertad de gravamen) before buying, confirming the seller is the registered owner and there are no adverse claims or liens.
• Verify the property is current on property tax (predial) in the correct name, since tax payment is powerful evidence of ownership on either side of a dispute.

Registration does not make prescription impossible in every case, but it stacks the evidence heavily in your favor and removes the “unregistered, unclear ownership” gap that possessors exploit.

Define and defend your boundaries: the deslinde

Encroachment claims often start with unclear boundaries. A deslinde (a formal boundary survey and demarcation, produced by a licensed surveyor) fixes exactly where your land ends.

• Commission a deslinde at purchase so your boundaries match the deed and the cadastral record.
• Mark or fence the perimeter where practical, converting an abstract line into a visible one.
• Photograph and date the state of the property periodically, building your own record of continued ownership and control.

If a neighbor’s fence sits inside your line, address it early. A boundary you tolerate for years can become a boundary someone claims.

Interrupting the clock

Prescription requires uninterrupted possession. That means an owner who acts can reset or break the period.

• If you discover an occupant, do not ignore it. A formal legal demand, or a court action asserting your ownership, can interrupt the running of the term.
• Maintain visible acts of ownership: pay the predial in your name, keep the property maintained, retain a documented relationship with anyone who watches it that clearly establishes them as your representative, not an owner.
• Keep the relationship with any caretaker documented, so their possession is plainly on your behalf, never “as owner.”

Time is the possessor’s ally and the owner’s enemy. Acting early, on paper, is what stops the clock.

Bottom line: an owner’s checklist

Prescripción positiva is real, legitimate, and defeated almost entirely by good documentation and attention. Whether you are buying or already own:

• Get and keep a registered escritura in your name in the Public Registry.
• Run a title search before buying and confirm there are no possession claims or gaps.
• Commission a deslinde and mark your boundaries so encroachment cannot creep in.
• Keep the predial current in your name as ongoing proof of ownership.
• If anyone occupies your property, act promptly and in writing to interrupt any prescription period.
• Ensure any caretaker relationship is documented as on-your-behalf, never “a título de dueño.”

Statutory periods and procedures differ by state civil code and are applied case by case, so confirm the specifics for your property’s location with a notary and a qualified real estate attorney (abogado) before relying on any timeline here. Ownership in Mexico is secure when it is registered, surveyed, and watched; the risk lives in the gaps, and those gaps are ones you can close.