100% Free

Check your Mexican suppliers & clients — free

Add your list of Mexican suppliers and clients once, and we'll check them against the government's fake-invoice blacklist — then watch it for you, every day. The moment one of your partners shows up on the list, you get an alert. No credit card, no trial: 100% free, backed by iAudita.

This isn't a one-time lookup — it's a watchdog. We check your whole list of business partners — suppliers and clients — against Mexico's official blacklists, and then keep checking every day so you don't have to. If one of them ever lands on the list, you'll hear about it right away — before it can cost you anything.

Why it's worth a few minutes of your time: if your Mexican business wrote off an invoice from a blacklisted company, the tax authority can cancel that deduction and come back for the unpaid tax, plus fines. Catching it early keeps all of that off your plate. Want the detail first? Read about the risks and penalties, or start with what a fake-invoice supplier is. (In Mexico, these blacklisted shell companies are known as EFOS.)

What you get

Everything the check does for you

One free tool to check your whole list of partners, keep an eye on it every day, and hold on to the proof that you did.

Check your whole list at once

Add your suppliers and clients (or connect your e-signature) and check hundreds of partners against the blacklist in one go.

We watch it daily

The blacklist changes all the time. We re-check your list every single day — you don't have to lift a finger.

Instant alerts

We let you know the moment one of your partners shows up on the list, so you can act in time.

All four official lists

We check against the four official Mexican blacklists of risky taxpayers — the same ones Mexico's 2026 customs rules expect you to verify.

Protect your deductions

Catch the risk before you file, and keep the tax authority from throwing out the deductions you're entitled to.

Proof on file

We save the result of every check with a date — a clean record to show if the tax authority ever asks.

Check my suppliers free
Simple & fast

How it works, in 3 steps

In under 5 minutes your list is checked and under our daily watch.

1

Create your free account

All you need is your email. No credit card, no trial.

2

Add your suppliers & clients

Upload your list of business partners, or connect your e.firma (Mexico's electronic tax signature) to pull them in automatically from your invoices.

3

Get your results and daily alerts

See who's at risk right away, and let us watch your list for you every day — we'll alert you to any change.

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The four lists we check

Checking only the fake-invoice blacklist isn't enough anymore — Mexico's 2026 customs rules now expect you to verify several official lists of risky taxpayers. So we check your partners against all four of them, in plain terms:

List Who's on it
Fake-invoice sellers Shell companies that invoice for deals that never happened (in Mexico: EFOS)
Non-compliant taxpayers Businesses with unpaid final tax debts, or that can't be located
Tax-loss shufflers Companies that improperly pass around tax losses to lower their bill
False-receipt issuers Businesses caught issuing false tax receipts

Run an IMMEX/maquiladora or an import-export operation? Verifying these lists is exactly what Mexico's 2026 customs rules ask of you. Checking your partners with EFOSGratis helps you show that you did — and keeps the proof on file for everyone you work with.

Who it's for

Made for businesses operating in Mexico

If your Mexican business writes off invoices, it's worth checking who you're dealing with. These are the owners and teams who get the most out of it.

Foreign-owned Mexican companies

Protect your Mexican business by checking every supplier before you write off their invoices.

IMMEX / maquiladoras

Keep your supply chain clean and show the verification the 2026 customs rules expect.

Importers & exporters

Check all four official lists for your trading partners, just as Mexico's 2026 customs rules expect.

CFOs of multinationals

If your group has a Mexican entity, a blacklisted supplier can turn into lost deductions and fines. Keep an eye on it from one place.

Accounting firms

Watch the suppliers and clients of all your Mexican clients from a single dashboard.

New to all this?

Start with the basics: what a fake-invoice supplier is, how Mexico's blacklist works, and why it matters for your business.

Frequently Asked Questions

Questions about the check

Is the check really free?

Yes. Checking your suppliers and clients against the government's fake-invoice blacklist is 100% free. No trial, no credit card.

What does the tool actually check?

We check your partners against the four official Mexican blacklists of risky taxpayers — the same ones Mexico's 2026 customs rules expect you to verify.

Can I check clients as well as suppliers?

Yes, and it's worth doing both: a client that lands on the blacklist can drag your business into a tax audit too. We screen your whole list.

How often do you re-check my list?

Automatically, every day. We watch your list and alert you the moment one of your partners shows up on the blacklist.

Do I need a Mexican e-signature to use it?

No, it's not required. You can upload your list of tax IDs (RFC, the Mexican tax ID) by hand. If you connect your e.firma (Mexico's electronic tax signature), we pull your partners in automatically from your invoices.

Do you keep a record of each check?

Yes. We save every check with its date, so you always have proof that you did your homework if the tax authority ever asks.

Create a free account and check your suppliers today

No credit card. No trial. Protect your Mexican business's deductions before it's too late — backed by iAudita.

Create my free account