Written for Mexico. This analysis applies to Mexican federal tax law — ISR (income tax), IVA (VAT) and SAT rules — and cites Mexican statutes. Amounts are in Mexican pesos (MXN).
The scene repeats itself: someone lands a job in Madrid, Austin or Dubai, boards the plane and assumes their relationship with the SAT (Mexico's tax administration) ended at the immigration counter. It didn't. Mexico taxes its tax residents on their income from all over the world (art. 1 LISR) — and tax residency is not lost by changing your zip code: it is lost by complying with the rules of art. 9 of the CFF (the federal tax code), which include a formal procedure most people discover years too late, when the SAT asks about the income that "was no longer from here." Here is, in full, how to stop being a tax resident in Mexico — and the locks almost no one tells you about.
Who is a resident: the three layers of article 9
You are a Mexican tax resident if your primary residence is in Mexico. If you also have a home in another country, your center of vital interests decides: you remain a Mexican resident if more than 50% of your income for the year comes from a Mexican source, or if Mexico is the main center of your professional activities. On top of that sits an uncomfortable presumption: unless proven otherwise, every individual of Mexican nationality is presumed to be a resident of Mexico. Translation: the burden of proving you are no longer a resident is yours, with facts — not with plane tickets. The case of the nomad who "lives nowhere" is not a lucky loophole: without a new, provable residency, the presumption sends you back to Mexico. And the additional passport moves none of these pieces, as we explain in the myth of the second passport.
The procedure that decides everything: the notice (and the 3-year lock)
Here is the detail that turns legitimate moves into contingencies: ceasing to be a resident requires filing the change-of-tax-residency notice with the SAT (art. 27 CFF and its regulations), no later than 15 days before the move. Since the 2022 reform, art. 9 says it plainly: whoever omits the notice does not lose resident status. In other words: you can genuinely live in Berlin for five years and, for Mexican law, still be obligated to report your worldwide income here — with penalties and omissions piling up in an RFC (your federal taxpayer ID) you thought was retired. A well-executed exit file also includes the final return, the resolution of your pending obligations and the correct decision about your RFC going forward.
Second lock: if your new residency is in a country or territory where your income becomes subject to a preferential tax regime (it pays less than 75% of the ISR it would pay in Mexico), you do not lose Mexican residency even with the notice: you keep paying here in the year of the change and the three following ones — unless that country has a broad information-exchange agreement in force with Mexico. It's the anti-paper-move lock: the Dubai/Monaco/tax-haven route carries a four-year toll almost no one mentions when they sell you the relocation.
Life afterward: what you keep paying in Mexico even when you're no longer a resident
Ceasing to be a resident does not sever every tie — it changes your title. Your income with a Mexican source of wealth moves to Title V of the LISR with definitive withholdings: rent from your real estate in Mexico is withheld at 25% of gross income (art. 158 LISR), a property sale at 25% of the gross price — or 35% of the gain if you appoint a representative in Mexico (art. 160) — and salaries only escape if the service is physically performed outside the country. While the transition happens, the treaties to avoid double taxation are the referee: their tie-breaker rules (permanent home, center of vital interests, habitual abode, nationality) resolve the hybrid years, and the credit under art. 5 LISR keeps you from paying twice while you remain a Mexican resident with taxes paid abroad. One more nuance: with CRS and FATCA automatically reporting your accounts, "I left and no one found out" ceased to exist — the detail is in undeclared foreign accounts. Labels: a real move with notice, file and a proven new residency — safe; a real move without the notice — an open contingency worth regularizing now; a paper move to low taxation — a red zone with a statutory lock.
Are you leaving — or have you already left without closing the file?
A well-executed tax exit is a project of weeks, not an endless pending item: analysis of your real residency against art. 9 and the applicable treaty, the notice and closing returns, a decision about the RFC and the assets that stay behind (rentals, companies, investments) and the schedule of what you'll keep paying as a non-resident. If you already live abroad without having filed the notice, the diagnostic sizes up the contingency and maps the regularization route before the SAT finds it through CRS.
Frequently asked questions
If I work remotely from abroad for a Mexican company, where do I pay taxes?
It depends on your residency, not your payroll. If you are still a Mexican tax resident (which is most likely if you didn't file the notice), you pay in Mexico on worldwide income, crediting what you paid abroad if a treaty applies. If you are no longer a resident and the service is physically performed outside Mexico, that salary stops having a Mexican source and, in principle, pays no ISR here — but the key is that your loss of residency is real and formalized.
I never filed the notice and I've lived abroad for years — how serious is it?
Under Mexican law you are still a resident (art. 9 CFF after the 2022 reform) and you should have reported worldwide income all those years. The double-taxation treaty can rescue you through the residency tie-breaker, but that is built with a file — it does not operate on its own. Voluntary regularization — before the SAT finds you through information exchange — is dramatically cheaper than the alternative.
Is the change-of-residency notice the same as suspending activities?
No. Suspension freezes your periodic obligations but keeps you as a Mexican resident. The change-of-tax-residency notice is what documents that you stop being one — with the final return and the corresponding closure. Filing the wrong procedure leaves your worldwide income anchored to Mexico with the appearance of order.
What happens to the rentals and investments I leave behind in Mexico?
They move to the non-resident regime (Title V LISR) with definitive withholdings on the Mexican source: 25% gross on rental income, 25% of the gross price on the sale of real estate (or 35% of the gain with a representative), and the specific rules by type of investment. It's arithmetic worth running BEFORE you move: sometimes restructuring how the assets are held before leaving changes the result for years.
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