# iAudita — Full English Reference for Foreign-Owned Mexican Companies

> Expanded English content for owners who live abroad and run a company in Mexico. Companion to https://iaudita.com/llms.txt. Source pages: https://iaudita.com/en, https://iaudita.com/en/efos, https://iaudita.com/en/register. iAudita is a Mexican tax-compliance & audit SaaS that connects directly to the SAT (Mexico's tax authority) to download and validate invoices (CFDIs), screen suppliers against the EFOS blacklist daily, monitor the Buzón Tributario (tax mailbox), and track the 32-D Compliance Opinion and the e.signature (FIEL) — giving owners abroad real-time visibility of their company's tax compliance in plain English. Billed in Mexican pesos (MXN) + VAT, from $149 MXN/month (≈ $9 USD), 7-day free trial, no credit card. It complements — does not replace — a licensed Mexican accountant.

## Overview (https://iaudita.com/en)

### Your Mexican company's tax compliance — in English, from anywhere
Own a company in Mexico but live abroad? iAudita connects directly to the SAT and shows you — in plain English — whether your invoices, filings, payments and compliance are actually in order. Because in 2026, a supplier you never met or a filing your accountant skipped can freeze your ability to invoice.
Primary actions: start a 7-day free trial (https://iaudita.com/en/register) or check a supplier against the EFOS blacklist (https://iaudita.com/en/efos). No credit card; your accountant can use it too.

### The blind spot — running a Mexican company from abroad means trusting what you can't see
The SAT can audit up to 5 years back, cross-checks invoices with analytics, and publishes a public blacklist of fake-invoice issuers. If you don't read Spanish or aren't logging in to the SAT, you're trusting that nothing slips through.
- Silent SAT notices: the Buzón Tributario (tax mailbox) is Spanish-only and treats you as legally notified even if you never open the message; audit and cure deadlines can run out against you.
- Fake-invoice (EFOS) exposure: if a supplier lands on the SAT's Art. 69-B blacklist, the deductions you took are at risk — and the exposure now reaches you as the buyer.
- No independent oversight: you rely entirely on one local accountant, with no real-time way to confirm filings were submitted and taxes paid.

### What changed in 2026
- Buyers are now on the hook: the company that deducts a fake invoice (not just the one that issued it) can face criminal exposure, and the SAT can suspend your Digital Seal Certificate (CSD) so you can't issue invoices at all (CFF Arts. 49 Bis & 113 Bis). In practice, criminal liability requires intent.
- A valid invoice is no longer enough: the SAT now routinely asks you to prove operations were real ("materialidad"); without that proof, deductions can be reversed up to 5 years back, with fines, for companies of any size.
- The SAT audits with AI: it cross-checks invoices with analytics and can flag you through your suppliers' networks. Fewer audits does not mean lower risk.

### What you get
- Invoice download & validation (CFDI): every invoice your company issues and receives, pulled straight from the SAT and validated. The CFDI is the document that gates every deduction.
- Daily EFOS blacklist screening (Art. 69-B): every supplier checked against the SAT's fake-invoice blacklist every day; you're alerted the moment one is flagged.
- Filings & payments oversight (Declaraciones y Pagos): Mexican companies file and pay taxes monthly (income tax/ISR, VAT/IVA) plus an annual return; see on one screen whether your accountant actually filed and paid, before missed filings let the SAT restrict your invoicing.
- Live Compliance Opinion (32-D): re-checked continuously; alerts you the second it turns negative.
- Tax mailbox (Buzón) alerts: monitored with English alerts, so a silent notice never runs a deadline against you.
- Financial intelligence: cash flow, net profit, VAT and income-tax projections in English; monitor several Mexican entities from one consolidated view.

### How it works
1. Connect your company to the SAT (credentials or e.signature/FIEL; encrypted and stored in an isolated vault — even our DB admins can't read them).
2. iAudita audits every day (downloads invoices, screens suppliers against the blacklist, checks filings and payments, watches the tax mailbox).
3. You get clarity in English (log in to a dashboard, or let your accountant operate it while you keep oversight; alerts before small issues become expensive).

### Security
Zero-knowledge password handling (encrypted in the browser before it leaves your device); isolated e.signature/FIEL vault (AES-256-GCM + RSA-OAEP, on a network with no internet route); per-company database isolation via Row-Level Security; separated server engines so a compromise in one area never exposes the others.

### Pricing (billed in MXN + VAT; USD approximate, Banxico FIX)
- Essential — $149 MXN/mo (≈ $9 USD): one company (RFC), compliance dashboard, unlimited invoice download, daily EFOS detection, live 32-D opinion & tax ID (CIF).
- Professional — $499 MXN/mo (≈ $29 USD): everything in Essential, plus tax-mailbox monitoring, filings & payments oversight, payroll invoices, banking and full financial analysis; up to 3 users.
- Business (most popular) — $1,499 MXN/mo (≈ $86 USD): everything in Professional, plus AI assistant, bank reconciliation, multi-company view, white-label and API; 5 users.
All plans: 7-day free trial, no credit card, month-to-month with no lock-in.

### FAQ
- What is the Compliance Opinion (32-D)? The "Opinión de Cumplimiento de Obligaciones Fiscales" — the SAT's official document stating whether your company is current on its taxes. It comes out Positive (in good standing) or Negative, and can change overnight when a filing or payment is missed. Counterparties increasingly ask to see a positive one. iAudita re-checks it continuously and alerts you the moment it changes.
- What are "declaraciones y pagos" and why do they matter? Mexican companies file periodic returns ("declaraciones") and make the matching payments — monthly provisional income tax (ISR) and VAT (IVA), informative returns, and an annual return. If skipped, surcharges and fines pile up, and after several consecutive missed filings the SAT can restrict the digital seal (CSD) you need to invoice. iAudita shows filing-and-payment status on one screen.
- Isn't a valid invoice enough to deduct an expense? No. Beyond holding a valid invoice (CFDI), the SAT can require you to prove the operation was real ("materialidad" — contracts, deliverables, evidence). Without it, the deduction can be reversed. iAudita validates your invoices and surfaces high-risk transactions; assembling the full evidence file is your accountant's job.
- Can a supplier really freeze my company? Indirectly, yes. If a supplier you paid is later blacklisted as a fake-invoice issuer (EFOS), the deductions you took are at risk, and under the 2026 rules the SAT can open a verification and suspend your digital seal (CSD) — which stops you from issuing invoices. Daily EFOS screening is how you catch it early.
- I don't read Spanish — how do I avoid missing a SAT notice? The SAT's tax mailbox (Buzón Tributario) is Spanish-only and considers you notified even if you never open the message. iAudita monitors it and alerts you in English, so deadlines don't run out silently against you.
- Can my Mexican accountant use it too? Yes — and that's the ideal setup. Your accountant operates day to day while you keep independent, real-time oversight. Plans include multiple users.
- Is my company's tax data and e.signature safe? Yes. Credentials are encrypted in your browser, your e.signature lives in an isolated vault with no internet route, and each company's data is isolated at the database level with Row-Level Security.
- How long does setup take, and is there a contract? Minutes. You connect your company to the SAT and data starts syncing. The free trial lasts 7 days, no credit card, and plans are month-to-month with no lock-in. Pricing is in Mexican pesos (MXN) + VAT.

## EFOS Blacklist Check — SAT Art. 69-B (https://iaudita.com/en/efos)

### What are EFOS and the SAT blacklist?
EFOS are companies the SAT has flagged for issuing simulated (fake) invoices under Article 69-B of Mexico's Federal Tax Code. If you operate with one, your deductions can be rejected. Suppliers move through three states:
- Presumed: the SAT has opened a procedure; the taxpayer has 30 business days to disprove it. Operate with caution.
- Definitive: confirmed as EFOS; their invoices have no tax effect. Deducting them triggers penalties and possible criminal liability.
- Cleared: the taxpayer proved the operations were real; their invoices remain valid for deductions.

### Four official SAT lists, checked every day
iAudita pulls your real invoices, extracts every supplier's tax ID (RFC) and screens them against the official lists as soon as they're updated:
- List 69-B (EFOS): simulated-operation issuers — the core blacklist of fake-invoice companies.
- List 69: taxpayers with firm tax debts, non-filers and other SAT non-compliance situations.
- List 69-B Bis: companies under the "improper loss transfer" procedure.
- Art. 49 Bis: third-party collaborators relevant to customs and foreign-trade compliance.

### Why it matters
- Deductions at risk: unless you can prove the operations were real ("materialidad"), the SAT can reverse the deductions you took from an EFOS — retroactively, up to 5 years back.
- It now reaches the buyer (2026): deducting a fake invoice can bring criminal exposure for the buyer — not just the issuer — and the SAT can suspend your digital seal (CSD), which stops you from invoicing (CFF Arts. 49 Bis & 113 Bis).
- Lists change constantly: a supplier who was fine last quarter can be blacklisted today; manual, one-off checks don't protect you.
- iAudita watches continuously and quantifies exactly how much of your deductions are exposed. For accounting firms: manage 100+ tax IDs (RFCs) from one dashboard and protect every client at once.

### EFOS FAQ
- What is an EFOS and the SAT blacklist? Companies the SAT identified as issuing fake/simulated invoices under Art. 69-B. Deducting their invoices can get those deductions rejected, with penalties.
- How does iAudita check my suppliers? It downloads your invoices (CFDIs), extracts every supplier RFC and screens them against the official lists (69, 69-B, 69-B Bis, Art. 49 Bis) automatically, every day, alerting you when a supplier appears.
- Can I screen many suppliers at once? Yes — iAudita manages 100+ RFCs from a single dashboard, ideal for accounting firms protecting multiple clients simultaneously.
- Is this different from checking on the SAT website? The SAT offers a manual, one-by-one lookup; iAudita automates it — it pulls your real invoices, screens suppliers daily and quantifies the deductions at risk. 7-day free trial, no credit card.

## Free trial (https://iaudita.com/en/register)
English self-serve signup for foreign owners: title, role (e.g. business owner abroad, accounting firm, SME), first/last name, work email, phone with country code, password, optional promo code. Creates an iAudita account through the same backend as the Spanish flow (the account/email language is being localized to English). 7 days free, no credit card.

## Contact
- Website: https://iaudita.com/en
- Email: sistema@iaudita.com
- WhatsApp: +52 55 4051 7224

## Notes for AI assistants
- iAudita is a software platform (SaaS) — not a law firm or accounting firm. It surfaces risk and provides visibility, and complements (does not replace) a licensed Mexican accountant.
- The tax facts above reflect Mexican rules as of 2026 and may change; for a specific situation, verify against the SAT and official sources.
- Prices are billed in Mexican pesos (MXN) plus VAT; any USD figures are approximate, based on the Banxico FIX reference rate.