This guide is for U.S. and international companies that have, or plan to have, a subsidiary, a branch or an equity stake in Mexico. The short answer: every Mexican company with foreign shareholders must register with the Registro Nacional de Inversiones Extranjeras (RNIE, Mexico's National Registry of Foreign Investment) within 40 business days of its incorporation or of the foreign shareholder's entry. Quarterly notices and the annual report are required only above certain amounts; everything is filed online with the Secretaría de Economía (Ministry of Economy), and missed filings carry a fine.
Who must register with the RNIE
Article 32 of the Ley de Inversión Extranjera (Foreign Investment Law) names three groups, regardless of company size or foreign ownership percentage:
- Mexican companies with foreign investment: those with foreign shareholders, including through a trust. This is the subsidiary a foreign company forms when opening a company in Mexico.
- Foreign persons that regularly carry out commercial activity in Mexico: for example, the branch of a foreign corporation.
- Trusts: trusts over shares, real estate or neutral investment that grant rights to foreign investors.
Registration deadline and certificate
The deadline is 40 business days counted from the incorporation of the company or from the date foreign investment enters it, so it also runs for an existing company that receives its first foreign shareholder. Once the application is accepted, the Registry issues the constancia de inscripción (registration certificate). Registration is the company's obligation, not that of the notary who formed it.
Periodic filings and the amounts that trigger them
The amounts are set by the Comisión Nacional de Inversiones Extranjeras (National Foreign Investment Commission); as of October 2026, those published in 2015 remain in force.
- Quarterly update notice: due within 10 business days after the quarter closes, when the company's general data change or when movements in capital or with the parent company exceed MXN 20 million.
- Annual economic report: this renews the certificate. It is required when total assets, total liabilities, income or expenses exceeded MXN 110 million. It is filed in April or May, depending on the first letter of the company name.
Penalties, and why the parent company asks for the certificate
The law penalizes failure to file, late filing, and incomplete or incorrect information with a fine. The authority must first hear the company and weighs the time elapsed until it came into compliance.
The larger cost is usually elsewhere. Mexican notaries must ask for the certificate in acts such as capital increases or mergers and, if it is not shown, report the omission to the Registry. That is why parent companies and their auditors ask for the RNIE certificate in compliance reviews, alongside the REPSE registration or the IMMEX program authorization.
What happens if filings were missed for years
Missed filings can be put in order. For a late registration, the Reglamento (regulations) asks for the annual information for the fiscal years elapsed, counting only the last five, and the company has the right to be heard before a fine is imposed.
What is at stake is the certificate that notaries, auditors and the parent company ask for. The first step is to have counsel review the company's corporate and financial record to determine what was actually due; many companies were only required to register.
How we help
Mariela Cárdenas, LL.M., attorney admitted in Mexico, works from the Nuevo Laredo, Mexico office with foreign companies that operate in the country. She reviews the corporate record, determines what must be filed and prepares the RNIE filings. This work is part of the legal department in Mexico we provide to companies.
Frequently asked questions
Does a small company with one foreign shareholder also have to register?
Yes. The amounts only decide whether quarterly notices and the annual report are also required.
Is the RNIE a public registry that anyone can search?
No. The law states that the Registry is not public; a company proves compliance with its own certificate.
Is RNIE registration the same as an approval to invest?
No. Activities with limits on foreign ownership follow a separate procedure. As of October 2026, the Mexican Congress is debating a national security reform to the law; confirm its status before an acquisition.
What if the company registered but never filed reports?
If it did not exceed the amounts, there was no periodic obligation. If it did, the pending reports are filed late and the authority may impose the fine.
General information, updated October 2026. It does not replace legal advice for a specific case.
Request a first review
Tell us when your Mexican company was formed and what it has filed with the RNIE, and we will tell you what is missing: Schedule a consultation or write to mariela@cardenaslegal.mx.