Choosing the right structure for manufacturing in Mexico

US companies usually arrive in Mexico with a product, a customer commitment and a target date. The legal question that follows is deceptively simple: through what structure will we operate? The answer shapes almost everything that comes after it, from who employs the workforce to who holds the import program to where a tax audit would land.

Three models

Contract manufacturing. A Mexican manufacturer produces for you under a supply agreement. It is the lightest footprint: you own no Mexican entity and employ no one. The trade-off is control. Quality, intellectual property and continuity depend on a contract, so the agreement has to do the work that ownership would otherwise do.

Shelter. A shelter provider acts as the legal employer and holds the import program, while you direct production, often with your own equipment. Shelter is typically the fastest route to production and limits the foreign company’s exposure to Mexican tax and labor liabilities. Mexican tax law, however, allows foreign companies to rely on the shelter regime only for a limited period, so a shelter is best treated as a stage, with an exit plan agreed from the start.

Wholly owned subsidiary. You form your own Mexican company, apply for your own import program and employ your own people. It offers full control and builds long-term value, but it takes longer and places compliance squarely on you: tax, social security, labor, customs and environmental permits.

Entity type matters on both sides of the border

Most subsidiaries are formed as a sociedad anónima (S.A. de C.V.) or a sociedad de responsabilidad limitada (S. de R.L. de C.V.). For US tax purposes the choice is not neutral: the Mexican S.A. is treated as a corporation per se, while the S. de R.L. can generally elect its US tax classification. That is a conversation to have with your US tax adviser before incorporation, not after.

The order of decisions

The most common and most expensive mistake is signing an industrial lease or a supply contract before the operating model is settled. The lease, the permits, the import program and the employment structure all depend on who the Mexican operator will be. We recommend deciding in this order: operating model, entity and tax profile, trade regime, site, workforce, and then the commercial contracts that tie it together.

Intercompany contracts are not paperwork

Whatever the model, the contracts between the US parent and the Mexican operation must describe how the business actually works: who owns the inventory and equipment, who bears which risks, and how the Mexican side is paid. Tax and customs authorities read these contracts closely, and a mismatch between paper and reality is where exposure usually starts.