The 90-Day Window: A First-Person Guide to Mexican Property Due Diligence After Signing Your Promesa

The day you sign a promesa de compraventa feels like crossing a finish line. It isn’t. It’s the starting gun. I learned this the hard way on my first property purchase in Mexico. The ink was barely dry and I was already fielding calls from a notario I’d never met, being asked to provide documents […]

The day you sign a promesa de compraventa feels like crossing a finish line. It isn’t. It’s the starting gun.

I learned this the hard way on my first property purchase in Mexico. The ink was barely dry and I was already fielding calls from a notario I’d never met, being asked to provide documents I didn’t know existed, and trying to decode a process that nobody had actually walked me through in plain language.

The period between signing a promesa and reaching the closing table, typically 60 to 90 days, is where deals are made or quietly fall apart. It’s where title defects surface, where financing snags get exposed, and where buyers who thought they were nearly done suddenly realise the work has only just begun.

This guide is what I wish I’d had. A realistic, week-by-week account of what actually happens during that window, who is responsible for what, and how to stay on top of it when you’re managing everything from a different country.

What the Promesa de Compraventa Actually Commits You To

Before walking through the timeline, it helps to be clear on what the promesa is and isn’t. It’s a binding purchase agreement, but it’s not the deed transfer. Think of it as a contract that locks in the price, the parties, and the terms while the formal closing process gets underway.

The promesa typically includes:

• The agreed purchase price and currency
• The deposit amount (usually 10% of the purchase price)
• A closing deadline
• Conditions that must be met before closing can proceed
• Penalties for backing out, on either side

That deposit is real money at risk. Understanding what happens over the next 90 days is how you protect it.

Weeks 1 to 2: Setting Up the Infrastructure

The first two weeks after signing are mostly administrative, but skipping any of it creates friction later.

Engage your notario immediately. In Mexico, the notario público is a state-appointed legal officer who handles the actual deed transfer. They are not the same as a notary public in the US or Canada. Your notario will request a full document package from the seller, and the sooner they start, the more lead time you have to resolve anything that comes back incomplete.

Open a Mexican bank account or confirm your wire transfer path. Most closings require funds to be transferred in pesos or USD through a specific mechanism. Some buyers use a Mexican bank account; others wire directly through their agent or a licensed escrow service. Get clarity on this early, because international wire timing can be unpredictable.

Confirm your RFC and immigration status. Foreign buyers need a Mexican tax identification number (RFC) to complete a property transaction. If you don’t have one, apply now. The process typically takes two to four weeks and requires in-person attendance at a Servicio de Administración Tributaria (SAT) office.

Weeks 3 to 5: The Core Due Diligence Phase

This is where the real work happens, and where most buyers underestimate the complexity.

Title search and Registro Público de la Propiedad. Your notario will conduct a search of the Public Property Registry to verify clean title, confirm the seller’s ownership, and check for liens, mortgages, or encumbrances. This process in Mexico is more manual than buyers from the US or Canada are used to. It can take two to three weeks, and the results are not always clear-cut.

Fideicomiso review or setup. If you’re buying in a restricted zone (within 50km of the coast or 100km of a national border), you cannot hold title directly as a foreigner. You’ll need a fideicomiso, a bank trust that holds the title on your behalf while you retain all beneficial rights. If a fideicomiso is already in place on the property, your notario will review its terms and arrange the transfer of beneficiary rights. If one needs to be set up from scratch, allow extra time and budget for bank trust fees.

The Asociación de Notarios de México (the national notaries association) publishes guidance on fideicomiso requirements, and it’s worth reviewing their materials if you want to understand the legal mechanics in more detail.

Survey and physical inspection. Hire an independent inspector. This is not standard practice in Mexico the way it is in North America, but that doesn’t mean you should skip it. A structural inspection, a review of utilities and water access, and a confirmation that the property boundaries match the escritura (deed) are all worth the cost. Boundary disputes are more common than most buyers expect.

Weeks 6 to 8: Resolving What Surfaces

Due diligence rarely comes back completely clean. Here’s what commonly surfaces and what to do about it.

Outstanding predial (property tax) payments. Sellers are sometimes behind on annual property taxes. This is not necessarily a deal-breaker, but it needs to be resolved before closing. Your notario will typically require a certificate of no outstanding debts from the local municipality.

Discrepancies in the property description. The cadastral record (the local government’s measurement of the property) sometimes doesn’t match the title document. This needs to be corrected through a formal process before the deed can be transferred cleanly.

Fideicomiso permit delays. The bank trust permit comes from the Secretaría de Relaciones Exteriores (Mexico’s foreign ministry). Delays are common. If you’re in a busy coastal market like Puerto Vallarta or Cabo, applications stack up. Build this into your expectations and communicate with your notario weekly.

If you’re working with a bilingual platform like Mexhome real estate that connects buyers with experienced local agents and legal support, many of these issues can be anticipated before they become crises. Local knowledge matters enormously here.

Weeks 8 to 10: Pre-Closing Preparation

By this point, you should have a clear picture of whether the deal is on track. If major issues are unresolved at week eight, it’s time to have an honest conversation about extending the closing date or renegotiating terms.

Assuming things are moving forward:

• Review the closing statement (estado de cuenta). Your notario will prepare a breakdown of all costs: acquisition tax (ISAI), notary fees, fideicomiso setup costs, and any agreed-upon adjustments. Budget roughly 4% to 7% of the purchase price in total closing costs, though this varies by state and transaction type.
• Arrange your final wire transfer. Confirm the exact amount in writing. Exchange rates move, and a small fluctuation on a $250,000 USD transaction can shift the final figure by hundreds of dollars.
• Confirm your power of attorney setup if closing remotely. Many international buyers sign a poder notarial (notarised power of attorney) so a trusted representative can sign on their behalf at the notario’s office. This needs to be set up in advance, with apostille certification if signed outside Mexico.

Week 10 to 12: Closing Day and What Follows

Closing in Mexico doesn’t happen at a big table with everyone in the room, usually. In many transactions, the buyer has already left the country. The notario manages the process, confirms receipt of funds, records the deed, and delivers certified copies.

A few things to know:

• The escritura (deed) will not be in your hands immediately. The notario submits the deed to the Public Registry, and the registration process can take weeks. You’ll receive a certified copy in the interim.
• Capital gains tax obligations for the seller are calculated and paid at closing through the notario. As the buyer, you’re not responsible for them, but if the seller hasn’t planned for this, it can create last-minute surprises.
• Get your documents in order post-closing. Ask for a certified copy of the escritura, the fideicomiso agreement, proof of predial payment, and your HOA documentation if applicable.

Managing the Process From Abroad

The honest reality of managing a Mexican property transaction from Canada, the US, or Europe is that communication gaps are your biggest enemy. Time zones, language differences, and the pace of Mexican bureaucracy can all conspire to make you feel out of the loop.

A few things that help:

• Establish a weekly check-in cadence with your agent and notario from day one. Even a five-minute update call keeps things moving and surfaces issues early.
• Use WhatsApp. Virtually every professional in Mexico communicates via WhatsApp. Email often goes unanswered for days; a WhatsApp message usually gets a same-day response.
• Have a point of contact in Mexico. Whether that’s your agent, a property manager, or a trusted friend, having someone who can physically show up at an office on your behalf is valuable when bureaucratic processes stall.
• Don’t over-rely on the seller’s timeline. Their incentives are not perfectly aligned with yours. Your notario and your agent are your advocates.

Anyone still in the early research phase, browsing houses for sale in Mexico and trying to understand what the process involves before making any commitments, should factor this 90-day window into their planning timeline well before they sign anything.

Key Takeaways

• The promesa de compraventa starts a clock, not a countdown to relaxation. The 90 days that follow require active management.
• Your notario is the central figure in Mexican property law, and engaging them immediately after signing is non-negotiable.
• Fideicomiso setup, title searches, and government permit applications all take longer than expected. Build buffer time into your closing deadline.
• Closing costs in Mexico typically run 4% to 7% of the purchase price, and buyers from abroad should confirm the exact breakdown in writing before wiring final funds.
• Managing the process remotely is entirely possible with the right team, a consistent communication rhythm, and a local contact who can act on your behalf when needed.

Frequently Asked Questions

Can the closing deadline in the promesa be extended if something is unresolved? Yes, and it’s more common than most buyers expect. Extensions need to be agreed upon in writing by both parties. If the delay is caused by something outside your control, such as a government permit backlog, a reasonable seller will typically agree to an extension. Have your agent negotiate this formally rather than relying on informal assurances.

What happens if the title search uncovers a problem? It depends on the nature of the issue. Minor discrepancies, like a spelling error in the registered owner’s name, can often be corrected administratively. More serious issues, like an undisclosed lien or a boundary dispute, may require renegotiation of the purchase price, a holdback from the seller’s proceeds, or in rare cases, walking away from the deal entirely.

Is a fideicomiso required for all coastal properties? Yes, if the land falls within the restricted zone (50km from the coast or 100km from a national border). There’s no way around this requirement for foreign buyers. However, a fideicomiso is not a lease or a limitation on your rights. You can rent the property, sell it, renovate it, and pass it on to heirs, all through the trust structure.

Do I need to be in Mexico for closing? No. Many buyers close remotely using a notarised power of attorney. The document needs to be signed before a local notary in your home country and apostilled for use in Mexico. Your Mexican notario can provide the exact language required.

What should I do if my notario goes quiet and stops responding? Start by following up through your agent, who should have a direct relationship with the notario’s office. If the silence continues, ask your agent to escalate in person. Notario offices handle multiple transactions simultaneously and sometimes require direct prompting to keep your file moving. Persistent, polite follow-up is part of the process.

Closing Thoughts

Buying property in Mexico as a foreigner is genuinely achievable. The legal framework, while unfamiliar, exists to protect buyers. The fideicomiso system has been in place for decades. Thousands of transactions close cleanly every year.

What separates a smooth closing from a stressful one is usually preparation, not luck. Understanding what the 90-day window actually involves before you sign a promesa means you’re not caught off guard when the process gets complicated. And it will get complicated at some point. That’s not a warning to avoid it; it’s just an honest account of how it works.

Go in with clear eyes, a good team, and a realistic timeline, and the process is very manageable.