In Mexico the practical difference between the two labels is close to zero, because both resolve to the same legal structure: a REPSE-registered provider acting as the sole employer. Internationally, a PEO implies co-employment and normally requires you to have a local entity, while an EOR employs the staff outright and does not. Under Mexican law only the second structure is available. If a provider is selling you a meaningful distinction between the two in Mexico, ask them which article of the Federal Labor Law it rests on.
Concept
United States
Mexico
Employment model
PEO co-employment, or EOR sole employment.
Sole employment only. No co-employment.
Local entity required
Usually yes for a PEO, no for an EOR.
No. The provider employs outright.
Who may provide it
Licensing varies by state.
Only providers registered in REPSE.
Scope limits
Broad.
Service must be specialized and outside your corporate purpose.
If the provider is unregistered
Contractual dispute.
Non-deductible invoices, joint liability, fines per worker.