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Foreigners entering México must hold an appropriate immigration status under the Ley de Migración, administered by the Instituto Nacional de Migración (INM). Entry categories include visitor (tourist), temporary resident, and permanent resident. Visitors may not engage in remunerated activities. Temporary residency (1–4 years) is typically required for employment, business activities, or long-term stays, and often demands proof of income, investment, or a job offer. Permanent residency grants indefinite stay and is usually available after several years of temporary residence, family ties, or retirement income. Unauthorized work or overstaying can result in fines, deportation, or re-entry bans. Immigration status is foundational, as it affects tax residency, labor rights, and access to services.