Running a company in Mexico? Here's a local risk most foreign owners never hear about — and the good news is it's easy to stay ahead of. Some Mexican companies exist mainly to sell fake invoices for deals that never happened — "shell companies" the tax authority puts on a public blacklist. If your business ever wrote off an invoice from one of them, the tax office can cancel that deduction, demand the back taxes, and add fines. Checking your suppliers and clients takes just a few minutes — and it's completely free.
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In Mexico, some companies are set up mainly to sell invoices for goods or services they never actually delivered. The tax authority catches them and adds them to an official blacklist. Locally these companies are called EFOS — but the part that matters is simpler: the tax penalty usually falls on the customer who used the invoice. If that's your company, a deduction you took can be thrown out years later.
The trap most foreign businesses fall into: you can do everything right — pay a supplier that looks completely legitimate, receive a normal invoice, and deduct it like any other expense — and still get caught. If that supplier is flagged later, the problem becomes yours: the tax office can reach back several years and undo the deduction, and you usually only find out during an audit, with little time to react. The reassuring part — a quick check today, plus ongoing monitoring, keeps you clear of it.
A "shell company" that issues invoices for deals that never happened. Mexico blacklists them (locally: EFOS).
Whoever wrote off that invoice. In Mexico this side is called an EDOS — and it's who the tax office comes after.
An official, public list. The dangerous moment is when a supplier is confirmed on it — their invoices stop counting for taxes.
Lost deductions, back taxes with interest, fines that can exceed half the amount — and, in serious cases, criminal exposure.
Just your email. No credit card, no trial.
Upload your list of business partners (or connect your Mexican e-signature to pull them in automatically).
See who's at risk instantly, and let us watch your list for you every day.
We're iAudita, a Mexican tax-compliance platform. This free check is how foreign-owned companies and their accountants get to know us. Checking your business partners is yours, free, for good.
We compare against Mexico's official government blacklist, kept up to date.
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Processed on servers in Mexico, under Mexican data-protection law.
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