Fraud Investigation in Mexico

What a Fraud Investigation in Mexico Establishes

A fraud investigation is not a search. It is an attempt to answer a specific set of questions to a standard someone else will test.

What happened, in what sequence, and over what period. Who did it, and who knew. What it is worth, established from records rather than estimated. Where the money went and what it became. Whether anything can be recovered, and through what route. And whether the evidence will hold up in the forum where it is going to be used.

Those last two decide whether the exercise was worth doing. An investigation that establishes a loss beyond doubt, against a defendant who owns nothing and evidence a court will not admit, has produced a very expensive explanation.

The Records That Do the Work

Mexican fraud work runs on a specific set of records, and knowing which one answers which question is most of the skill.

The tax record is the fastest and the most underused. The Servicio de Administración Tributaria publishes lists under Articles 69 and 69-B of the Federal Tax Code naming taxpayers with irregularities, including those presumed to have issued invoices for operations that never took place. In Mexican practice the issuers are called EFOS and the users EDOS. Where an invoice in your ledger came from a company on that list, you have a documented starting point rather than a suspicion.

The commercial registry, which now runs nationally on the Ministry of Economy's SIGER 2.0 platform, gives incorporation, capital, corporate purpose and the powers granted to officers. It does not give shareholders. Ownership sits in notarial deeds, in later shareholder assemblies and in the company's own private share book, which is why establishing who really controls a counterparty is document work rather than a lookup. The full sequence is set out in our guide to how to verify a Mexican company.

Social security filings with the Instituto Mexicano del Seguro Social answer whether a company actually employs anyone. A supplier invoicing for labor-intensive work with no registered workforce is a question worth asking early.

Court records establish claims, attachments and prior enforcement, with coverage uneven across the states and the federal circuits. Property is registered state by state. Registered security interests over movable assets sit on a free national registry.

And then there is the part no record answers, which is what the premises look like, who is actually working there, and what the people around the subject will say.

What Nobody Can Lawfully Obtain

Bank account data is confidential under Article 142 of the Ley de Instituciones de Crédito. A bank may give account information to the holder or their representative, and otherwise only to a judicial authority in proceedings to which the holder is a party and to a defined list of authorities, routed through the banking regulator. There is no private route.

Private communications are inviolable under Article 16 of the Constitution and only a federal judicial authority can authorize interception. Anyone offering you a target's bank statements, call content, messages or live location is describing something obtained unlawfully.

This matters commercially and not only ethically. Evidence obtained that way cannot be put before a Mexican court, will not survive scrutiny in a foreign one, and exposes the client who commissioned it. What can be established lawfully is the structure around the money, which is usually what an application to the court needs, and the application is what reaches the rest.

Evidence That Survives Contact With a Court

Most fraud files we are asked to review were assembled to explain the problem internally. They read well and they do not travel.

Evidence that travels is obtained from an identified source on a recorded date, in a form that can be certified. Documents from a registry are obtained as certified copies where they are going to be exhibited, not as screenshots. Translations are done properly, by a translator whose work can be attested, because the receiving court reads the Spanish or the English rather than your summary of it. The chain from source to exhibit is recorded as the work is done, not reconstructed afterwards from memory.

Where a matter is heading abroad, notarization and an apostille go to the provenance of a document rather than to whether a court will admit it. We say that plainly rather than implying more, and admissibility is decided by the court hearing the matter and by your own lawyers.

Where the outcome may be a dismissal, the file has to satisfy Mexican labor law rather than only convince a manager, and that requirement shapes how the investigation is run from the first day rather than at the end.

Criminal Complaint, Civil Claim, or Neither

Clients often assume the answer is a criminal complaint. Sometimes it is. Often it is not, and the decision should be taken with the evidence in hand rather than in the first week.

A criminal complaint in Mexico is filed with the prosecutor, state or federal according to the offense, and opens an investigation folder. It costs little to file and it puts the pace of the matter in someone else's hands. It can be the right route where the conduct is clear, the evidence is documentary and there is a realistic prospect of the prosecutor acting.

A civil or commercial claim keeps control with you and is usually the route where the objective is money rather than a conviction. Mexican commercial procedure allows precautionary measures, including the retention of property, and they can be sought before the main claim is filed. The applicant has to show a liquid and enforceable debt, describe the asset precisely, swear to the grounds for fearing disposal and post security, which is why the underlying report has to carry that level of detail. Finding the asset is only half the work, and the rest is set out on our page on asset tracing in Mexico.

And sometimes the answer is neither. Where the loss is smaller than the cost of pursuing it, or the counterparty holds nothing, the useful output is a file that supports an insurance claim, a write-off, a negotiated settlement or a change to the control that failed. We will tell you when that is the position.

Sanctions and Cartel Exposure

Since the 2025 designations of Mexican cartels as foreign terrorist organizations, a fraud matter can carry a second exposure that has nothing to do with the original loss. Where the money moved through an intermediary connected to a designated group, or a supplier in the chain has that exposure, the problem changes from a commercial one into a sanctions one.

We screen for it as a matter of course in fraud work rather than treating it as a separate exercise, and the wider picture is set out in our analysis of cartel and FTO risk in Mexico.

What You Receive

A written report in English, structured so that it separates what has been verified from what has been reported and what we infer. Each finding is tied to the record it came from, with the source, the reference and the date of retrieval. Where a loss is quantified, the calculation and the documents behind it are shown rather than summarized.

Where a finding is unresolved we say so, and explain what would resolve it and at what cost. A report that answers only the questions it happened to be able to answer, without naming the ones it could not, is not a report we would sign.

Supporting documents are supplied as obtained, and where the matter is heading to court we arrange certified copies, official translations and legalization as required.

How Much Fraud Investigation in Mexico Costs, and How Long It Takes

Cost depends on scope, the number of states and entities involved, the volume of documents and whether field work is required. A focused review of a single supplier relationship is a small piece of work. A multi-entity diversion traced through layered companies, with ownership analysis and site verification in several states, is not.

Timing follows the same logic. Electronic records return in days. Certified copies, older paper records at a state registry, document review at volume and anything requiring travel take longer. Where funds have just moved, the first days matter more than the budget, and we scope those matters differently.

We do not publish fee figures, because a figure without a scope tells you nothing. Send us the matter and you will have a scope and a price before anyone starts.