There are three practical ways for a foreign company to manufacture in Mexico: set up your own subsidiary, produce under a shelter's legal entity, or buy finished parts from a contract manufacturer. They differ mostly in what you control and what you carry. Picking wrong is expensive in a way that is slow to become visible.
Your own subsidiary
You incorporate a Mexican entity, register with SAT for an RFC, obtain your own IMMEX permit, register as an employer with IMSS, and hire directly. You control everything and you carry everything — labour law, environmental compliance, customs obligations, profit sharing, and the permanent liability that comes with a legal presence.
This is the right answer at scale and over a long horizon. It is the wrong answer for testing whether Mexico works for you, because the setup is measured in a year and unwinding it is measured in more.
Shelter
You produce inside a host company's plant, under its entity and its IMMEX permit. You bring equipment, process and quality standards; the host provides the legal body, the permits, recruiting and payroll, the facility and customs compliance.
You keep control of the thing that makes you money — your process — and you skip the year of setup. The trade is that you are operating inside someone else's entity, which means the relationship and the contract matter more than they would if you owned the building.
- Starts in months rather than a year
- No Mexican incorporation, no employer registration, no own permit
- You keep process, equipment and quality ownership
- Host carries entity, IMMEX, payroll, facility and compliance
- Unwinding does not mean dissolving a company
Contract manufacturing
You buy finished parts or assemblies. The supplier owns the process, the equipment and the people, and you are buying an outcome to a specification. Fastest to start, least to carry, least control over how the thing gets made.
For many companies this is not a stepping stone, it is the destination — particularly where the manufacturing is not the differentiator. Where it is a stepping stone, the usual progression is contract manufacturing first, then a shelter once volume justifies dedicated capacity.
Choosing between them
The question that separates them fastest is not cost, it is this: is your manufacturing process the thing that makes you competitive? If yes, you want a shelter or your own entity, because handing the process to a supplier hands over the advantage. If no, contract manufacturing is almost always the right first move and often the permanent one.
The second question is time. If you need to be running inside six months, your own entity is not on the table, whatever the long-term maths says.
When a shelter is the wrong answer
Being straight about this saves everyone time. A shelter is a poor fit if your volumes do not justify dedicated space and headcount, if you need to be operational in weeks rather than months, or if you are not prepared to be in the plant regularly during ramp-up. It is also the wrong answer if what you actually want is to buy parts — in which case you want a contract manufacturer, and the shelter conversation is a detour.
Quick answers
What is a shelter manufacturer in Mexico?
A Mexican company that lets a foreign manufacturer produce inside its plant, under its legal entity and IMMEX permit. You bring your process and equipment; the shelter carries the entity, permits, payroll and facility.
Is a shelter cheaper than my own entity?
Not necessarily in per-unit terms at scale. What a shelter saves is setup time and permanent liability, which is why it suits companies testing Mexico rather than those already committed to it.
Can I move from a shelter to my own entity later?
Yes, and it is a common path. Companies frequently start under a shelter and transition to their own entity once volumes and confidence justify carrying the compliance themselves.
Which model starts fastest?
Contract manufacturing — nothing has to be incorporated, permitted or hired before work begins. A shelter starts in months. Your own entity is typically a year or more.
