Invoice without errors. No calls to the accountant. No fear of the SAT.
CFDI 4.0 invoicing system with an assistant that guides you on every invoice — you say what you're charging and who you're charging, we make sure it reaches the SAT without errors. Stamping through a SAT-authorized PAC.
Built by watching real businesses invoice
— not from a software office.
Teotech started by running systems in real businesses in Guanajuato, Mexico. The hardware store with more than 16,000 products, the restaurant that invoices late at night, the workshop that issues credit notes because the customer paid in cash the next day. In all of them we saw the same thing: the SAT is accessible but not user-friendly, and every business was losing hours navigating a portal that doesn't understand its reality.
The problem wasn't intent — businesses want to invoice correctly. The problem was friction: learning SAT codes, identifying the client's tax regime, memorizing the CFDI usage codes in force. Knowledge that changes every six months when the SAT publishes new catalogs.
We built the Teotech invoicing system to remove that friction. It stamps through a SAT-authorized PAC (legal, no shortcuts), but on top of stamping we added an assistant that interprets natural language and fills in the technical fields for you. In 2025 we released it as a platform — the same technology proven in real Guanajuato businesses, available to any company in Mexico.
First invoicing pilots integrated with Teo POS
RFC assistant with automatic SAT validation
Authorized-PAC integration and full CFDI 4.0 support
Public launch at cfdi.teotech.mx — open to the market
Most businesses in Mexico invoice however they can — not how they should.
The SAT portal goes down at peak hours. Traditional systems require you to know your client's tax regime, the exact product code and the corresponding CFDI usage. If you get it wrong, the invoice bounces or your client can't deduct it.
In 2025 the SAT rejected more than 8 million invoices for simple errors. Starting in 2026 it can suspend your Digital Stamp Certificate if it detects inconsistencies. Without a CSD you can't invoice. Without invoices you can't sell.
The SAT portal goes down when you need it most
At peak hours — month-end, payday — the SAT portal gets overloaded. Each invoice can take you 10-15 minutes. If you have to issue 10 invoices a month, you lose hours.
Which code do I use? What regime is my client on?
Thousands of product codes and regimes that change every six months. One wrong code and the invoice is stamped incorrectly — or your client can't deduct it and calls you to redo it.
Every SAT change forces you to update your system
The SAT updates its catalogs several times a year. If your system doesn't update automatically, you keep using outdated codes that generate silent errors.
A system that invoices with you — and an assistant that tells you exactly what to enter
Teotech offers a CFDI 4.0 invoicing system designed for businesses that don't have an in-house accountant or time to learn tax jargon. The system guides you through every field. The assistant fills in what you don't know. And if at any point you have a question, WhatsApp.
Stamping through a SAT-authorized PAC
Your invoice is stamped through a Certified Authorization Provider officially recognized by the SAT. The Digital Fiscal Stamp guarantees the legal validity of every CFDI you issue. No improvised middlemen, no risks.
AI assistant that invoices for you
Tell it in plain language what you need: "Make me an invoice for $1,500 for Jorge from La Ferretería El Toro." The assistant looks up the RFC, verifies it's active with the SAT, selects the correct tax regime, suggests the appropriate CFDI usage and proposes the product code that fits your business.
Catalogs always up to date
Every time the SAT updates its catalogs — product codes, tax regimes, CFDI usages — the system updates automatically. You don't have to do anything. Your invoices always go out with current data.
Every type of fiscal document
Income invoices, credit notes, payment complements, payroll receipts and Carta Porte — every CFDI type your business may need, from a single system.
Full history and instant download
All your CFDIs stored, organized by month and available to download as PDF and XML when you need them — for your accountant, for an audit or to keep your books current.
Automatic delivery to the recipient
When stamped, the invoice PDF and XML are automatically sent to your customer's inbox. No re-sending, no hunting for files on your computer.
Built for businesses in Guanajuato — and any company across Mexico
Retail and grocery
Hardware stores, grocery stores, mini-marts and retail. Invoice every sale in seconds, with the correct product code and your client's tax regime validated in real time.
Restaurants and food service
Consumption invoices, payment complements, invoicing to companies paying by card. The assistant knows which CFDI usage matches each type of sale in a restaurant.
Workshops and technical services
Mechanics, electricians, carpenters, plumbers and any service provider that needs to issue correct invoices without losing time on the SAT portal.
Medical practices and professionals
Doctors, dentists, lawyers, accountants and any professional that invoices fees. Correct regime, correct CFDI usage, no errors that invalidate deductibility for your client.
Distributors and wholesalers
High invoice volume, multiple clients with different tax regimes, Carta Porte for transfers. The Unlimited plan covers your entire operation with no extra cost per invoice.
Companies with multiple legal entities
If you operate more than one company under different RFCs, the system manages them all from a single login — no separate licenses, no configuring different systems.
In three steps, your business is invoicing
No complicated installations. No weeks of setup. Most of our clients issue their first invoice the same day they sign up.
We sign you up in minutes
You share your RFC and your CSD. We configure your account and verify the connection with the SAT. No site visits, no installations.
The assistant guides you
You tell it who you're invoicing and for how much. The assistant fills in the RFC, regime, CFDI usage and product code automatically.
Stamped and sent
The invoice gets its Digital Fiscal Stamp and the PDF + XML files arrive in your customer's inbox automatically.
Support when you need it — human, fast and no tickets.
Most invoicing systems leave you alone with a user PDF. With Teotech you get WhatsApp support with same-day response — and a built-in assistant that resolves most questions on the spot.
In-system AI assistant
Available 24/7. It answers questions about which product code to use, how to cancel an invoice, what CFDI usage matches your sale and any day-to-day operational question.
WhatsApp support
For cases the assistant can't resolve. A real team that reads your message and responds the same day. No ticket. No waiting days for an answer.
Video call by appointment
For initial setups or complex cases. 30 minutes, scheduled online and at your convenience. No extra cost.
Teotech Facturación: technology that transforms how you invoice
The name Teotech comes from Nahuatl: Teo means transformation or change, joined with tech (technology). Our logo represents Quetzalcóatl, a Mesoamerican symbol of renewal.
Inside the system lives Itza, our AI assistant. Her name comes from the sacred site Chichén Itzá, where the deity is still present. Itza helps you find the correct SAT key, prefills invoices and answers operational questions in plain language.
Nahuatl in the brand, Quetzalcóatl in the logo, Chichén Itzá in the assistant — every piece connects with Mexican culture.
What people ask us most about CFDI invoicing.
Before migrating their invoicing system, businesses almost always have the same questions: validity before the SAT, what happens if they make a mistake on an invoice, how to handle RESICO. Here we resolve those common doubts.
What do I need to start invoicing with Teotech?
You need three things: your active RFC with the SAT, your current Digital Stamp Certificate (CSD) and the corresponding password file. If you don't have your CSD or it's expired, we'll explain how to renew it at the SAT. We handle the rest of the setup.
Is it legal? Are my invoices valid before the SAT?
Yes. Your invoices are stamped through a Certified Authorization Provider (PAC) with official SAT authorization. Every CFDI you issue carries the Digital Fiscal Stamp that makes it legally valid. You can verify any invoice directly on the SAT portal using the document's UUID.
What happens if I make a mistake on an invoice?
You can cancel it from the system at any time. The cancellation process meets all SAT requirements — cancellation reason, request to the recipient when applicable — and the system guides you step by step. In 2026, cancellations have defined deadlines linked to the annual tax return month, so it's best to fix errors as soon as possible.
What is the CFDI usage code and how do I know which one to use?
The CFDI usage code indicates what the recipient will use your invoice for — whether it's a general expense, a fixed asset, professional fees, etc. It's one of the fields that generates the most errors because it depends on your client's tax regime. The Teotech assistant automatically selects the correct usage code based on the recipient's regime, eliminating that error without you having to know anything.
Does it work for individuals on RESICO?
Yes. The system is configured for every tax regime in force in Mexico — including RESICO (Simplified Trust Regime) for individuals and corporations, the general regime, salaried workers, leasing and the rest. Validations consider the issuer's and recipient's regimes so the CFDI is correct.
Can I issue Carta Porte for my shipments?
Yes, the Carta Porte Complement is included in the Pro and Unlimited plans. If you have transportation or merchandise transfer operations, the system guides you to issue the CFDI with Carta Porte correctly — including data for the carrier, sender, recipient and goods.
How does support work? Can you come to my business?
Our support is 100% remote — via WhatsApp and video call. We don't do on-site visits, but that doesn't limit the quality of attention: most questions are resolved within minutes via message. The built-in assistant is also available 24/7 to guide you the moment you need it.
How do I start invoicing with Teotech?
Go to cfdi.teotech.mx, register with your RFC and upload your Digital Stamp Certificate. In minutes your account is ready to issue your first invoice. If you need help in the process, message us on WhatsApp and we'll guide you step by step.
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