Expat Tax Residency in Mexico

Expats relocating to Mexico enter a tax framework administered by the Servicio de Administracion Tributaria (SAT) that differs meaningfully from day-count-only systems. The anchoring statute is Article 9 of the Codigo Fiscal de la Federacion (CFF), which establishes residency through a facts-and-circumstances analysis of where a person's life is centred, not simply how many days they are physically present.

How does Mexico determine tax residency?

Article 9 CFF, as summarised by PwC Worldwide Tax Summaries (last reviewed January 30, 2026), sets out two sequential tests. First, an individual is a Mexican tax resident if Mexico is the location of their permanent home (casa habitacion). Second, where permanent homes exist in more than one country, residency is determined by where the centre of vital interests (centros de intereses vitales) is located. The centre-of-vital-interests test is satisfied when either more than 50% of total annual income derives from Mexican sources, or when Mexico is the principal location of the person's professional activities. Mexican nationals carry a statutory presumption of Mexican residency that must be actively rebutted with evidence of substantive ties elsewhere (Article 9 CFF, sourced via SAT portal at sat.gob.mx).

What is the role of the 183-day rule in Mexico?

The 183-day physical-presence count familiar from many jurisdictions does not function as the primary residency trigger in Mexico. PwC's Mexico individual residence summary (taxsummaries.pwc.com/mexico/individual/residence) makes no mention of a standalone 183-day test. The day count retains relevance as supporting evidence of the centre-of-vital-interests analysis -- substantial physical presence strengthens a residency claim -- but spending fewer than 183 days in Mexico does not automatically defeat residency if the permanent home or income tests are met. Expats who maintain a casa habitacion in Mexico year-round but spend months abroad remain exposed to the residency test regardless of physical-presence calculations.

What income is taxable once residency is established?

Mexican tax residents are subject to ISR (Impuesto sobre la Renta) on worldwide income regardless of nationality. PwC confirms: "Resident individuals are subject to Mexican income tax on their worldwide income." Taxable income categories include employment income, business and professional fees, capital gains from asset disposals worldwide, dividend income from Mexican and foreign corporations, worldwide interest income, worldwide rental income, and tax-haven investment income even if undistributed. Non-residents, by contrast, pay ISR only on Mexican-source income at withholding rates that vary by category: dividends 10%, interest 4.9% to 35%, royalties 5% or 35%, professional services 25%, and real-estate disposals 25% on gross proceeds or 35% on net gain by election.

What are the ISR rate brackets for Mexican residents?

The table below shows the 2026 annual progressive ISR brackets confirmed by PwC Worldwide Tax Summaries (taxsummaries.pwc.com/mexico/individual/taxes-on-personal-income, last reviewed January 30, 2026). All figures in Mexican pesos (MXN).

At the approximate 2026 USD/MXN exchange rate, the 30% band begins at roughly USD 32,000. The top 35% rate applies above roughly USD 255,000. Brackets are indexed annually by SAT.

What are the filing and departure requirements?

Resident individuals file an annual Declaracion Anual electronically via the SAT portal (sat.gob.mx), with a deadline typically April 30 of the year following the calendar tax year. Monthly provisional ISR payments (Pagos Provisionales) are required by the 17th of each following month. Expats earning foreign-source income must provide currency-conversion documentation and substantiation of taxes paid in source countries to support foreign-tax-credit claims under Article 142 of the Ley del Impuesto sobre la Renta (LISR). Residents who cease to be Mexican tax residents must file a cessation notice with SAT within 15 days before the change of residency occurs. Mexico imposes no general exit tax on unrealised gains at departure, unlike some peer jurisdictions, but accrued income obligations through the departure date remain collectible.

For a broader understanding of how Mexico fits within the global jurisdiction landscape, see the Mexico country overview. Country tax residency rules vary significantly -- what applies in Mexico may not apply in neighbouring jurisdictions, and dual-residency conflicts require careful treaty analysis. Individuals establishing or ending Mexican tax residency should work with a qualified Mexican tax professional (contador publico certificado) who can assess their specific facts against Article 9 CFF and any applicable bilateral treaty provisions.