Mexican Tax Residency for Foreigners: When SAT Taxes Your Income
Tax residency in Mexico depends on where your home and your center of vital interests are, not on your visa or a day count. What changes once you qualify.
Under Article 9 of Mexico’s Federal Tax Code, a foreigner is a Mexican tax resident once they establish their home (casa habitación) in Mexico. If they also have a home in another country, they are resident in Mexico when their center of vital interests is there. Tax residents owe income tax to the Tax Administration Service (SAT) on worldwide income.
What makes you a tax resident in Mexico?
Mexican law uses a home test, not a day count. Article 9 of the Federal Tax Code (Código Fiscal de la Federación) treats as resident any individual who has established a home in Mexico. Immigration status is a separate question: a temporary resident card does not by itself make you a tax resident, and a visitor can become one if they set up a home here.
There is no 183-day rule in the Mexican code. Day counts appear in tax treaties and in other countries’ laws, which is why people often assume Mexico uses one.
What if you keep a home in another country too?
Then the tie-breaker is your center of vital interests (centro de intereses vitales). Article 9 says it is in Mexico when, among other cases:
- More than 50% of your total income in the calendar year comes from Mexican sources, or
- Mexico is the main center of your professional activities.
The words “among other cases” matter: the list is not closed, so other facts about your life can count. A remote worker paid by a foreign company who lives full time in a Mexico City apartment can still be treated as resident, because the home test comes first.
What do Mexican tax residents have to pay tax on?
Article 1 of the Income Tax Law (Ley del Impuesto sobre la Renta, LISR) says residents of Mexico pay income tax on all their income, wherever it comes from. Non-residents pay only on income from Mexican sources. The difference in practice:
| Situation | Mexican income tax applies to |
|---|---|
| Tax resident in Mexico | Worldwide income: salary, freelance fees, rent, interest, dividends, gains |
| Non-resident with no permanent establishment | Only income from Mexican sources, often by withholding |
| Non-resident with a permanent establishment | Income attributable to that establishment |
Mexico gives a credit for income tax paid abroad on foreign income, within limits set in the LISR. How much of a foreign tax bill you can credit depends on the type of income and the country.
How does the Mexico–US tax treaty affect Americans?
Mexico and the United States have a treaty to avoid double taxation. Its tie-breaker rules decide which country gets first claim when someone counts as resident in both, looking at permanent home, center of vital interests, habitual abode and nationality in that order.
US citizens stay subject to US tax on worldwide income wherever they live, so moving to Mexico rarely ends US filing. The usual result is that both countries see your income and credits reduce double tax. Get advice from someone who knows both systems before your first Mexican filing.
What do you have to file once you are resident?
The main obligations depend on what you earn and how you register:
- RFC: register with SAT for a tax ID; our guide to getting an RFC covers the appointment.
- Annual return: Article 150 of the LISR requires individuals with taxable income to file in April of the following year, with exceptions for some employees; see our guide to the annual tax return.
- Monthly payments: freelancers, landlords and business owners usually make provisional payments during the year, depending on their tax regime.
- Cash deposits: banks report to SAT when cash deposits into your accounts at one bank exceed MXN 15,000 in a month, under Article 55 of the LISR.
Registering an activity you do not have can create filing duties you then have to cancel. Decide your regime with an accountant before the SAT appointment.
What happens when you leave Mexico?
You stay a Mexican tax resident until you formally prove a new residence. Article 9 requires people who stop being resident to file a notice with the tax authorities no later than 15 days before the change. If you skip that notice, you do not lose Mexican residency for tax purposes.
Moving to a country SAT lists as a preferential tax regime can also keep you resident in Mexico for the year of the notice and five more years, unless that country has broad information-exchange and collection-assistance agreements with Mexico.
Bottom line
If you live in Mexico City full time, assume SAT can treat you as a tax resident and plan for worldwide income, whatever your visa says. Book a session with a contador who handles foreigners before your first April, and bring your foreign tax returns. This article explains the law in general terms and is not tax advice; SAT and a licensed accountant decide individual cases, and SAT’s official site at gob.mx/sat has the current rules.
FAQ
Does a temporary resident card make me a tax resident?
Not by itself. Tax residency follows the home and center-of-vital-interests tests in the Federal Tax Code, which are separate from immigration status. In practice many residency card holders also meet the home test.
Is there a 183-day rule in Mexico?
Not in the Federal Tax Code, which uses the home test instead. Days spent in Mexico can still matter as evidence, and some tax treaties use day counts for specific types of income.
Do digital nomads pay tax in Mexico?
It depends on whether they set up a home in Mexico and where their center of vital interests is. Short stays in hotels or rentals while keeping a home abroad point one way; a long lease and life centered in Mexico point the other. Immigration rules for remote workers are covered in our guide to working remotely in Mexico legally.
