In Mexico, company tax pressure starts long before the annual return

The hook

“A March deadline makes people think Mexico company tax is an annual event. It is not.”

Article 14 of the ISR law points companies toward monthly provisional payments, generally by the 17th day of the following month. The March annual return is still important, but SAT's own materials make clear that the company has already been living inside the tax system throughout the year.

The takeaway

If a founder only thinks about tax in late March, the real problem usually started months earlier.

Official sources

Artículo 14 ISR Declaración Anual 2025 Empresas

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