Why all of this protects you (notary, registry and anti-money-laundering)
It may seem there are many steps and many signatures, but each one exists to protect you, especially you, buying from abroad and unable to watch over everything. It is worth understanding where that security comes from.
The notary provides public faith: this is not a mere formality, but a public official who is answerable for the legality of what they sign and who is obliged to verify that the property exists, is free of encumbrances and is sold by the person who truly owns it. The Public Property Registry leaves official and public record that you are the holder, so that no one can later come forward claiming otherwise.
And there is the anti-money-laundering law (its full name is the Federal Law for the Prevention and Identification of Operations with Resources of Illicit Origin). That law treats real estate activity as a "vulnerable activity," which means that real estate agencies and notaries are obliged to identify their clients and to report certain transactions. For you this comes down to two things: you will be asked for identification and proof of address (this is normal and it is the law, not distrust), and large transactions cannot be paid in cash. The law itself prohibits paying for real estate in cash above a certain amount (around 940,000 pesos in 2026), so payment goes through the bank and leaves a clean trace of where the money came from. Far from being a nuisance, this is precisely what makes buying in Mexico safe: those who comply, buy with peace of mind.
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