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Last updated: Monterrey, Nuevo León, Mexico, August 2026

Terms and conditions of use

1. General terms

ContaGPT (hereinafter "ContaGPT" or the "Controller"), with address at Av. Puerta del Sol 260-6, Colinas de San Jerónimo, Monterrey, Nuevo León, Mexico, C.P. 64630, requires all visitors and users (hereinafter the "User") of its website https://contagpt.com, mobile applications, and other related digital platforms (hereinafter the "Platforms") to comply with the following rules and conditions, and any other service agreements, as applicable, required by ContaGPT for specific services or products (the "Service Agreement").

By accessing or using the Platforms, the User expressly and irrevocably accepts these Terms and Conditions, as well as any future modifications made by ContaGPT.

Given the dynamic nature of digital services, ContaGPT reserves the right to modify at any time the content, structure, and services offered on the Platforms without prior notice. The User agrees to periodically review these Terms and Conditions, available at https://contagpt.com/terminos.

These Terms and Conditions, the Privacy Notice and its periodic updates, and where applicable the Service Agreement, constitute the general regulatory framework for use of the Platforms (the "Site Rules").

2. Description of services

ContaGPT is an invoicing and tax-organization platform that, through the use of artificial intelligence, provides or makes available to the User services related to:

  • Issuance and stamping of digital tax receipts (CFDI 4.0) — income invoices, payment complements, and cancellations — through an Authorized Certification Provider (PAC), based on the instructions the User gives via WhatsApp or the Platforms.
  • Download, processing, organization, and analysis of the CFDI issued and received by the User before the Mexican Tax Administration Service (SAT).
  • Retrieval and periodic updating of the User's Constancia de Situación Fiscal (tax status certificate) from the SAT.
  • Retrieval and periodic updating of the User's Opinión del Cumplimiento de Obligaciones Fiscales (32-D, tax compliance opinion) from the SAT.
  • Custody, management, and use of the Advanced Electronic Signature (e.firma) and Digital Seal Certificates (CSD) from the SAT, solely for the purposes expressly listed in section 4 of these Terms.
  • Provision of a dashboard showing the User's tax information, together with the read-only access the User chooses to grant to their accountant and may revoke at any time.
  • Communication of alerts, reminders, and informational notifications via WhatsApp and other digital channels.
  • Any other accounting and tax automation service ContaGPT offers through its Platforms (the "Services").

ContaGPT does NOT file tax returns, does not make payments to the SAT on the User's behalf, and does not replace the services of a certified public accountant. The tax information the Platforms generate is informational and supportive in nature, and responsibility for meeting tax obligations remains with the User at all times.

Many Services are subject to electronic signature of a specific Service Agreement, compliance with the requirements set forth therein, and corresponding approval by ContaGPT.

ContaGPT cannot guarantee that the Services will be free of delays, omissions, or inaccuracies arising from causes beyond its control, including failures in SAT systems, interruptions in third-party services, or force majeure.

3. User obligations

When using the Platforms, the User agrees to:

  • Provide truthful, complete, and up-to-date information when registering and while using the Services.
  • Maintain the confidentiality of access credentials (username and password), as well as e.firma and Digital Seal Certificates, and be solely responsible for any unauthorized use thereof.
  • Not use the Platforms for illegal, fraudulent purposes or contrary to morals and good customs.
  • Not attempt unauthorized access to systems, accounts, or data of other users or ContaGPT.
  • Immediately notify ContaGPT of any unauthorized use of their account or any security breach of which they become aware.
  • Comply with all applicable laws and regulations in the use of the Services, including current Mexican tax provisions.

4. Use of e.firma and digital seal certificates

The User who provides their Advanced Electronic Signature (e.firma) and/or Digital Seal Certificates (CSD) to ContaGPT expressly authorizes ContaGPT to use them EXCLUSIVELY for the purposes listed below, and for no other purpose.

Use of the e.firma. The User's e.firma is used solely to:

  • Sign, on a single occasion, the service agreement (carta manifiesto) by which the User authorizes ContaGPT and its Authorized Certification Provider to operate on their behalf.
  • Download the User's issued and received CFDI from the SAT.
  • Retrieve the User's Constancia de Situación Fiscal from the SAT and keep it current.
  • Retrieve the User's Opinión del Cumplimiento de Obligaciones Fiscales (32-D) from the SAT and keep it current.

The e.firma is NOT used to issue or cancel CFDI, is not used to file returns or make payments, and is not used for any other procedure before the SAT or any other authority.

Use of the CSD. The User's Digital Seal Certificate is used solely to stamp the CFDI the User expressly authorizes: issuing their invoices and payment complements and, when the User so requests, cancelling them. The CSD is not used for any other purpose.

Safekeeping and encryption. ContaGPT safeguards these instruments applying the highest encryption standards available in the industry. The e.firma and CSD files (.cer, .key, and their password) are each encrypted individually with the AES-256-GCM algorithm, using a data encryption key that is unique to each User. That key is in turn protected by a master key residing inside a hardware security module (HSM) certified to the FIPS 140-2 Level 3 standard, operated through Google Cloud Key Management Service; the master key never leaves the HSM and is not accessible to ContaGPT personnel. The encrypted files are stored on restricted-access infrastructure and can only be decrypted by the automated processes that carry out the purposes described in this section, through a service account whose permissions are limited to that sole effect. All information travels encrypted over TLS. No individual working for ContaGPT has access to the User's e.firma or CSD files in plain text.

The User acknowledges and accepts that:

  • They are solely responsible for custody and safekeeping of e.firma and CSD files outside the Platforms.
  • ContaGPT implements the security measures described to protect such instruments but cannot guarantee invulnerability against sophisticated cyberattacks beyond reasonable control.
  • Use of e.firma has full legal validity under the Advanced Electronic Signature Law; the User is responsible for legal acts performed with it within the contracted Services.
  • Upon any suspicion of unauthorized use of their e.firma, the User must revoke it with the SAT immediately and inform ContaGPT.
  • The User may request deletion of their e.firma and/or CSD files from ContaGPT's systems at any time. Once deleted, the Services that depend on those instruments will no longer be available.

5. Communication via WhatsApp and other digital channels

ContaGPT uses WhatsApp Business (Meta Platforms, Inc.) as a communication channel with its clients. By providing their mobile phone number, the User expressly authorizes ContaGPT to contact them via WhatsApp to send:

  • Notifications on the status of their filings and tax obligations.
  • Alerts for deadlines and due dates before the SAT.
  • Accounting reports and financial statements.
  • Confirmations of operations performed on their behalf.
  • Operational communications related to the contracted Services.

The User may opt out of communications via WhatsApp at any time by notifying ContaGPT, without affecting service delivery as long as another communication channel is available. Messages sent via WhatsApp are also subject to Meta/WhatsApp Terms of Service and Privacy Policy.

6. Intellectual property

All content available on ContaGPT Platforms, including without limitation text, graphics, logos, icons, images, audio clips, digital downloads, data compilations, and software, is owned by ContaGPT or its content providers and is protected under Mexican and international intellectual property laws.

The User is strictly prohibited from reproducing, duplicating, copying, selling, reselling, or commercially exploiting any part of the Platforms without ContaGPT's prior written consent.

7. Links to third-party sites and alliances

ContaGPT Platforms may contain links to third-party websites or services, including the SAT portal, financial institutions, or other providers. ContaGPT is not responsible for the content, accuracy, quality, or availability of such sites or services.

ContaGPT shall not be deemed an agent of such third parties and shall have no liability to them or the User arising from the relationship between the User and such third parties. The client-provider relationship with third parties shall be exclusively between them and the User.

The User fully releases ContaGPT from any civil, criminal, or administrative liability that may arise from the use of links to third-party sites or services provided by external providers.

8. Limitation of liability

ContaGPT does not guarantee or endorse the accuracy or reliability of any information automatically generated by its artificial intelligence systems. The User acknowledges that tax and accounting information provided by the Platforms is indicative and does not replace the opinion of a certified public accountant or professional tax advisor for specific legal purposes.

ContaGPT shall not be liable for:

  • Errors, omissions, or inaccuracies in tax returns arising from incorrect or incomplete information provided by the User.
  • Penalties, fines, or surcharges imposed by the SAT or other tax authorities due to the User's failure to meet tax obligations.
  • Service interruptions due to failures in SAT, IMSS, or any other government systems.
  • Damage arising from unauthorized use of the User's credentials when the User has not promptly notified ContaGPT.
  • Any indirect, incidental, special, or consequential damages arising from use or inability to use the Platforms.

In any case, ContaGPT's maximum liability to the User, for any cause, shall be limited to the total amount paid by the User to ContaGPT in the three (3) months prior to the event giving rise to the damage.

9. Personal data protection

Processing of the User's personal data is governed by ContaGPT's Privacy Notice, available at https://contagpt.com/privacidad, which forms an integral part of these Terms and Conditions. By accepting these Terms, the User confirms having read and accepted the Privacy Notice.

10. Term and termination

These Terms and Conditions shall remain in effect while the User uses the Platforms or maintains an active subscription to ContaGPT Services.

ContaGPT reserves the right to suspend or cancel the User's access to the Platforms at any time and without prior notice if the User breaches any of these Terms and Conditions or any applicable legal provision.

The User may terminate their relationship with ContaGPT at any time by giving prior notice through the channels established at https://contagpt.com and paying any outstanding amounts, if any.

11. Modifications to the terms and conditions

ContaGPT reserves the right to modify these Terms and Conditions at any time. Modifications shall take effect upon publication at https://contagpt.com/terminos. Continued use of the Platforms by the User after publication of modifications shall constitute acceptance of such changes.

12. Applicable law and jurisdiction

These Terms and Conditions shall be governed and interpreted in accordance with the laws in force in the United Mexican States, in particular:

  • Federal Consumer Protection Law.
  • Federal Tax Code and other applicable tax provisions.
  • Advanced Electronic Signature Law.
  • Federal Law on Protection of Personal Data Held by Private Parties.
  • Commercial Code and other provisions of Mexican commercial law.

For any dispute arising from use of the Platforms or these Terms and Conditions, the parties submit to the jurisdiction of the competent courts of Monterrey, Nuevo León, Mexico, expressly waiving any other venue that may correspond due to their present or future domiciles.

13. Contact

For any questions, clarifications, or notices related to these Terms and Conditions, the User may contact ContaGPT at:

Address: Av. Puerta del Sol 260-6, Colinas de San Jerónimo, Monterrey, N.L., Mexico, C.P. 64630 Website: https://contagpt.com

Last updated: Monterrey, Nuevo León, Mexico, August 2026.