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. What's a fake-invoice shell company?
A quick, friendly note. This page is general information to help you understand the landscape — it is not tax or legal advice. For your specific situation, your Mexican tax advisor or attorney is the right call (and our Spanish pages have the exact statutes). Any peso figures here are approximate and change over time.
What actually happens to your business
Say your company in Mexico received and wrote off (deducted) an invoice from a supplier the tax authority later flags as a fake-invoice seller. The key thing to know is that nothing happens instantly or automatically — it follows a clear sequence, and you get a chance to respond at each step.
How it unfolds, step by step
- Your supplier is confirmed on the blacklist. The tax authority decides the company had no real staff, assets or capacity to do the work it billed for.
- Its invoices stop counting. The official invoices it issued to you no longer have any value for taxes.
- Your write-off is cancelled. Whatever your business deducted using those invoices is now left without support.
- The back taxes come due. If you do not show the deal was real or fix your return first, you would owe the tax you saved, plus interest and surcharges.
You get a window — about 30 days
Once a supplier is confirmed on the blacklist, you generally have around 30 days to either show the deal was real (prove the goods or services were actually delivered) or fix your return yourself by filing a correction. This window matters, and acting inside it keeps you in control.
What it costs, in plain terms
If things are not corrected, the bill comes in a few layers. None of these are designed to surprise you — they are predictable, which is exactly why catching the problem early is so valuable.
| What you face | What it means for your business |
|---|---|
| Lost tax write-off | The deduction you took on that invoice is cancelled, so the tax you thought you saved is now owed |
| Back taxes | You pay the tax your business ended up underpaying once the write-off is removed |
| Interest & surcharges | Added on top because the tax was paid late, building up month by month |
| Fine | A penalty that can run well over half of the tax you owed |
| Invoicing suspended | Your ability to issue official invoices can be paused, which can freeze your billing |
To put it in perspective: imagine your business wrote off about MXN 1,000,000 of expenses backed by fake invoices. You would not just repay the tax you saved — a fine that can run well over half of that tax gets added, along with interest and surcharges. That is how a "cheap" invoice ends up costing several times its face value. (Exact percentages and peso figures change over time; these numbers are approximate.)
Criminal exposure: the serious cases
Most situations are resolved with money and corrected returns. But it is honest to say that, in serious cases, using fake invoices can carry criminal exposure — and an important point for you to know is that this can reach the customer who used the invoice, not only the company that sold it. Whether it ever gets there depends on the amounts and the conduct, which is exactly the kind of thing a Mexican attorney can read for your specific case.
An accuracy note worth keeping
A few years ago, Mexican lawmakers tried to treat the trafficking of fake invoices as organized crime, as a national-security matter, and to attach automatic pretrial detention to it.
You should know that Mexico's Supreme Court struck that linkage down in August 2025. So it is not correct to say, as current law, that using or selling fake invoices is by itself "organized crime" or a "national-security" threat. We mention it only as past context that was invalidated — and because this area is still evolving, your Mexican tax advisor can confirm where things stand today.
Your ability to invoice can be suspended
Here is a practical one that catches people off guard. Even before any final bill arrives, the tax authority can disrupt your day-to-day operations by suspending the digital certificate your business needs to issue Mexico's official electronic invoices, called CFDIs.
A pause first
If the tax authority spots irregularities — for example, your business showing up as having used invoices from a blacklisted supplier — it can temporarily suspend your ability to issue invoices until you clarify what happened.
And a full stop, if it is not resolved
If you do not clear up the issue, that suspension can become permanent, which in practice stops your business from invoicing at all — and that can freeze your collections. The reassuring part: there is a clear process to clarify or correct the situation and get your invoicing restored.
If it happens: your roughly 30-day window
If a supplier your business dealt with is confirmed on the blacklist, take a breath — but act promptly. You have two clear paths inside that window of about 30 days, and either one keeps you in the driver's seat.
Path A: show the deal was real
Demonstrate to the tax authority that the work actually happened and your business truly received the goods or services. Good records are everything here:
- Signed contracts dated before the deal
- Purchase orders, quotes and email threads
- Bank records showing the payments you made
- Proof of delivery: photos, logs, receiving records
- Anything that shows the deal was genuine
Path B: fix your return yourself
If you cannot show the deal was real, the sensible move is to correct your return — remove the write-off and pay what is owed. Fixing it voluntarily is usually far less costly than waiting for the tax authority to step in and add a fine on top.
Before you decide, talk to your accountant or a Mexican tax advisor. Every business is different, and the right move — defend the deal or correct the return — depends on the records you have and the amounts involved.
The good news: this is easy to prevent
The simplest way to avoid all of the above is to never get there. A supplier that looks perfectly fine today can land on the blacklist later, and the tax authority can look back at deals from earlier years. Prevention really comes down to one habit: keep an eye on who you do business with.
Check your suppliers and clients — early and often
- Check a supplier's tax ID (its RFC) before you pay or write off its invoices.
- Keep watching your list over time: the blacklist changes constantly.
- Save dated proof that you checked, in case you are ever asked.
- Hold on to the paperwork that shows each deal was real, from the start.
EFOSGratis checks your whole list of suppliers and clients against Mexico's blacklist, for free. Add your business partners and let the system watch them for you every day. Want the background first? Read what a fake-invoice supplier is, or see how free supplier validation works.
Frequently asked questions
What happens if my business used an invoice from a blacklisted supplier?
If that supplier is confirmed on Mexico's tax blacklist, those deals are treated as if they never happened and your tax write-off is cancelled. You generally get about 30 days to show the deal was real or fix your return; otherwise you would owe the back taxes plus interest and surcharges. The good news: checking ahead of time is free.
How big are the fines?
The fine can run well over half of the tax you ended up owing, on top of the back taxes plus interest and surcharges. Exact figures change over time, so your Mexican tax advisor can confirm the current numbers.
Could someone go to prison?
In serious cases there is criminal exposure, and it can reach the customer who used the invoice, not only the company that sold it. Most everyday cases are resolved with money and corrected returns. It depends on the amounts and the conduct — a Mexican attorney can advise on yours.
Can the tax authority stop my business from invoicing?
Yes. It can suspend the certificate your business needs to issue official invoices, which can freeze your billing. There is a clear process to clarify or correct things and get it restored.
How long does my business have to fix it?
Generally about 30 days after a supplier is confirmed on the blacklist, to show the deal was real or file a corrected return. Acting early is always easier.
Are the fines and any prison figures fixed?
No. The peso amounts are adjusted over time and the area is still evolving. Any figures here are approximate; your Mexican tax advisor can confirm what applies now.
Last updated: June 2026. This page is general information, not tax or legal advice — please check your specific situation with a Mexican tax advisor (our Spanish pages have the exact statutes). Any peso figures are approximate and change over time.