Tax Talk

31/01/2026

Moving to Mexico as an expat comes with a fair share of paperwork, and eventually, you’ll hear the term e.firma (formerly known as FIEL). Think of it as your digital "Golden Ticket" for dealing with the Mexican government.

Here is everything you need to know to get started:

🔵 What exactly is the e.firma?
It is a secure, encrypted digital file that identifies you before the Tax Administration Service (SAT).

It has the same legal validity as your handwritten signature.

It ensures that documents signed electronically are authentic and cannot be forged.

It is unique, personal, and non-transferable.

🟢 What do you need it for?
While it’s a tax tool, its uses go far beyond just filing your annual returns.

Tax Compliance: Necessary for issuing electronic invoices (facturas) and filing taxes.

Legal Procedures: Used for signing contracts or handling social security (IMSS) tasks.

Government Apps: Accessing various online portals like the "Buzón Tributario."

🟡 How is it composed?
When you finish your appointment, you won't just get a password; you’ll receive a set of digital files (usually on a USB drive).

Certificate (.cer): The public part of your signature (like your ID card).

Private Key (.key): The secret part used to sign (keep this extremely safe!).

Password: A custom key you create to unlock the file when signing.

🔴 How do you obtain it?
As a first-time applicant, you must visit a SAT office in person to provide your biometric data.

Book an Appointment: Use the SAT portal to schedule an "e.firma Personas Físicas" appointment.

Requirements: You’ll need your CURP, proof of address, your Resident Card, and a USB drive.

Biometrics: They will take your fingerprints, iris scans (some times), and a digital photo on-site (some times).

Pro-Tip: Once you have it, make a backup of those files in the cloud! If you lose the files or forget the password, you'll have to book a new appointment and brave the SAT offices all over again.

11/01/2026

💡 Constancia de Situación Fiscal vs. Cédula de Identificación Fiscal

There’s no legal difference between the Constancia de Situación Fiscal and the Cédula de Identificación Fiscal.
Both documents are valid to request an invoice (CFDI) because they contain the essential tax information required by the SAT.

So why do businesses often insist on the constancia?

👉 The issue is usually on the business side, not yours.
Many establishments are simply not familiar with the cédula, and some don’t even know it exists. As a result, they default to asking for the constancia.

🔎 Practical tip:
If you already have your Constancia de Situación Fiscal, it’s usually better to share that one. It helps you avoid unnecessary discussions, delays, and bureaucratic headaches.

As a specialist in Mexican taxes for expats, I cover these real-life situations all the time here on Tax Talk.
If you want clear, practical guidance on navigating the Mexican tax system, you’re more than welcome to join the conversation.

☕ Simple taxes. Real answers. No drama.

26/08/2025

Paid taxes in the U.S.? You might be able to credit them in Mexico.

📌 If you're a tax resident in Mexico and you’ve paid income tax in the U.S. or Canada, can you credit those foreign taxes against your Mexican tax bill?

The short answer is: yes, but only under strict conditions. Let’s break it down with the law in hand. 👇

⚖️ What does Mexican law say?

According to Article 5 of the Mexican Income Tax Law (Ley del ISR), residents in Mexico who earn income abroad can credit the income tax they’ve paid in another country including the U.S. or Canada against their Mexican tax liability.

But this credit isn’t automatic.

🛑 The main requirements:

✅ You must already be considered a Mexican tax resident (Article 9, Código Fiscal de la Federación).
✅ The tax must be similar to Mexico’s income tax (ISR).
✅ You must have actually paid the foreign tax.
✅ You need official proof of payment from the foreign tax authority (e.g., IRS Form 1040 + payment confirmations).
✅ You must include that foreign income in your Mexican annual tax return (Declaración Anual).
✅ The credit can never exceed the Mexican tax payable on that income.
✅ The income must not be exempt under Mexican law.

📚 Legal basis: Article 5, LISR; Article 4, RLISR; Rule 3.17.3, RMF.

🔍 Practical example:

You earned $40,000 USD in the U.S. and paid $5,000 USD in federal taxes. If you’re a Mexican tax resident, and that income is taxable in Mexico, you may claim those $5,000 USD as a foreign tax credit — but only up to the amount of Mexican tax owed on the same income.

If Mexico’s tax on that income is lower than $5,000 USD, you can only credit up to the Mexican amount.

⚠️ Be careful:

❌ You cannot apply a credit for taxes you haven't paid yet.
❌ You can’t mix this with tax-exempt income.
❌ You must file your Mexican annual return to apply the credit.

💡 Final note:

This is a powerful tool to avoid double taxation but it’s not automatic, and it’s not retroactive without proper documentation.

📩 At Tax Talk, we help expats understand how to legally credit U.S. or Canadian taxes against their Mexican tax obligations. No guessing. Just the law.

✅ Hashtags:

03/08/2025

📌 Have you spent more than 183 days in Mexico this year?

Many expats believe that staying in Mexico for more than half the year automatically makes them tax residents.

The truth? It’s not that simple and the law is very clear about it.

Here’s what Mexican tax law actually says 👇

⚖️ What does the law say?
According to Article 9 of the Mexican Federal Fiscal Code (Código Fiscal de la Federación):

A person is considered a Mexican tax resident when:

They have a permanent home in Mexico; or

If they also have a permanent home in another country, they’re a resident in the country where they have their center of vital interests; or

If they don’t have a permanent home, they’re considered Mexican tax residents if they spend more than 183 days in Mexico in any 12-month period (whether consecutive or not).

But here’s the catch:
👉 183 days is only part of the equation.
The same article also states that your center of vital interests matters most and you’re considered to have it in Mexico when:

More than 50% of your total income in a calendar year comes from Mexican sources, or

Your main professional activities take place in Mexico.

📚 Legal reference: Article 9, Federal Fiscal Code of Mexico (CFF).

🧠 So when do you REALLY become a tax resident?
✅ If you have a home in Mexico and earn most of your income here or work primarily here, you’re very likely a Mexican tax resident.
✅ If you don’t have a home here, but do stay over 183 days and don’t have clear ties elsewhere, you might also qualify.

But...
❌ If you keep your permanent home, income, or vital interests in the U.S., Canada or anywhere else, you may not be a Mexican tax resident even if you’re here most of the year.

📌 Key takeaway:
Don’t assume that counting days is enough.
📊 Tax residency in Mexico depends on more than your calendar.

If you're not sure about your status, a proper review of your specific case is essential especially if you receive income from abroad.

📩 At Tax Talk, we help expats understand where they stand. No guesswork, just real answers based on Mexican tax law.

WhatsApp: 442 685 5165

24/07/2025

24/07/2025

You're a resident in Mexico with an online business? Read this.

If you're an expat living in Mexico as a temporary or permanent resident, and you've also become a tax resident, you need to know this:

📌 According to Mexican tax law, tax residents are obligated to report and pay taxes on their worldwide income: yes, even if your business is online and your clients are abroad.

👉 Article 9 of the Mexican Federal Tax Code (Código Fiscal de la Federación) establishes the criteria for tax residency. If Mexico is your main center of vital interests—or you've spent more than 183 days here—you are considered a Mexican tax resident.

👉 Article 1 of the Income Tax Law (Ley del Impuesto sobre la Renta) confirms that tax residents must pay income tax in Mexico on all their global income.

So yes, your online business must be declared in Mexico, and depending on your total earnings and deductible expenses, you may need to pay income tax here.

🎯 Not sure where to start or how to stay compliant?
That's where Tax Talk comes in.

We help expats understand and manage their tax obligations in Mexico clearly, legally, and in plain English.

📲 Follow our page for more helpful insights.
Tax Talk — Making Mexican Taxes Simple

17/07/2025

🎉 Welcome to Mexico! 🇲🇽

You finally got your Temporary or Permanent Residency Card? That’s awesome and a huge milestone. Bienvenido.

But here’s something many forget to mention in the celebration posts:

📌 Residency in Mexico isn’t just about immigration. It often comes with tax obligations too.

🧾 Are you now a Mexican tax resident?
If you’ve settled in Mexico, even part-time, there’s a good chance that you’ll eventually become a tax resident under Mexican law.

📚 Legal Reference:
According to Article 9 of the Mexican Federal Tax Code (Código Fiscal de la Federación):

“A person is considered a resident of Mexico for tax purposes if they have established their home (casa habitación) in Mexico.”

If they also have a home in another country, they are still considered Mexican tax residents if their center of vital interests is in Mexico. This happens when:

✅ Stay in Mexico 183 days a year
✅More than 50% of their total income in the year comes from Mexican sources, or
✅ Their main professional activity is located in Mexico.

📌 Official source (DOF - Diario Oficial de la Federación):
🔗https://www.diputados.gob.mx/LeyesBiblio/pdf/CFF.pdf
👉 See Article 9, page 7 in the current PDF.

🚨 Why this matters:
If you’ve made Mexico your home or plan to stay long-term you may be required to report and pay taxes in Mexico on your worldwide income, even if it comes from the U.S., Canada, or other countries.

Many expats don’t realize this until it's too late. Let’s fix that.

🤝 That’s where Tax Talk comes in.
We help expats understand and comply with Mexico’s tax system clearly, legally, and in plain English.

📞 Book a session
📘 Download our guides
✉️ Or just ask a question

10/07/2025

So… When Does Mexico Actually Become Your Tax Home?

If you're an expat living in Mexico, you've probably heard that after 183 days, you become a tax resident.

Well, not so fast.

Yes, time matters… but there’s another concept that Mexico takes very seriously:
👉 “Centro de intereses vitales” or in English, your Center of Vital Interests.

Let me explain it simply:

According to Article 9 of the Mexican Federal Tax Code (CFF), you are considered a tax resident in Mexico not just based on time spent, but also if:

✔️ Your main professional activities are carried out in Mexico,
OR
✔️ Your primary source of income comes from Mexico.

That means:

Even if you’re not here for 183 days,

Even if you still have ties abroad,
→ You may still become a Mexican tax resident if your economic life is now centered here.

💡 For digital nomads, remote workers, retirees, or anyone running a business from Mexican soil, this rule could apply.

And here’s the kicker:
Once Mexico sees you as a tax resident, you’re required to report your worldwide income no matter where it was earned.

Legal Basis:
📘 Código Fiscal de la Federación (CFF), Art. 9
https://www.diputados.gob.mx/LeyesBiblio/pdf/CFF.pdf

Need help figuring out your tax status?
At Tax Talk, we make Mexican taxes simple — and legal. 😌

📩 Message us anytime.

05/07/2025

Can Expats Residents in Mexico Enroll in IMSS?

Yes — if you have legal residency in Mexico, you can voluntarily enroll in IMSS (Mexico’s Social Security and Public Health System), even if you’re not employed by a Mexican company.

This program is available to expats who live in Mexico and work independently — such as freelancers, remote workers, consultants, or retirees.

✅ How is this possible?
Under Article 13 of the Mexican Social Security Law (LSS), independent workers — including foreign residents — may voluntarily enroll in the IMSS as “trabajadores independientes” (self-employed individuals).

This is known as the Voluntary Incorporation into the Mandatory Regime ("Incorporación Voluntaria al Régimen Obligatorio").

🔗 Official IMSS page:
👉 https://www.imss.gob.mx/personas-trabajadoras-independientes/extranjeros-en-mexico

🧾 Who qualifies?
You can apply if you:

Hold temporary or permanent Mexican residency

Have a CURP and RFC

Are not formally employed in Mexico, but want medical coverage

Have a Mexican address and supporting documents (e.g. proof of residency)

🩺 What does IMSS cover?
Once enrolled and premiums are paid, you’ll gain access to:

General medical care and prescriptions

Hospitalization and surgeries

Maternity, disability, and life coverage

Pensions and retirement (if eligible)

Benefits for legal dependents (spouse, children, parents)

💡 All services are provided in public IMSS hospitals and clinics throughout Mexico.

💰 What does it cost?
Premiums vary by age. For example:

Age 30: approx. $7,000–$8,000 MXN per year

Age 60+: approx. $18,000–$19,000 MXN per year

You can pay monthly, quarterly, or annually.

🧩 Summary
✅ Yes, as an expat you can legally enroll in IMSS —
as long as you hold Mexican residency and register under the proper modality.

📌 This is not automatic. You must apply voluntarily and pay the required contributions.

📚 Legal basis:

LSS Article 13, I

IMSS official website and enrollment guidelines

—

At Tax Talk, we help expats understand their legal options — and guide you step by step through tax and public service access in Mexico.

🇲🇽 Making Mexican Taxes Simple.

02/07/2025

I have an RFC in Mexico but I’ve never filed taxes — is that a problem?

This is more common than you think.
Many expats get their RFC (Mexican taxpayer ID) to open a bank account, buy property, or complete immigration paperwork — but then never use it again.

So what happens if you’ve never filed a tax return or activated any regime?

Let’s clear it up 👇

✅ 1. Having an RFC alone doesn’t mean you must file taxes.
If your RFC shows “sin obligaciones fiscales” (no tax obligations), then:

You’re not registered in any tax regime

You’re not required to file monthly or annual returns

You have no reporting obligations — yet

This status is perfectly valid if you don’t have income in Mexico or abroad to report.

⚠️ 2. But things change if your status changes.
You must update your profile if:

You start earning income from Mexican or foreign sources

You want to issue invoices (CFDIs) or open a business

You change your residency status and become a tax resident in Mexico

📌 SAT rules (CFF Art. 27 & RMF Rule 2.4.15) require that your RFC always reflect your actual activity and regime.

🧾 3. How to check if you have obligations
Look at your Constancia de Situación Fiscal (CSF).
It shows your regime and whether you’re required to file. If you see:

“Régimen: Sin obligaciones fiscales”
…then you’re fine — for now.

If you see:

“Régimen de Personas Físicas con Actividades Empresariales”
or anything similar — you may be required to file, even if you haven’t earned anything yet.

💬 Not sure how you’re registered with SAT?
At Tax Talk, we help expats review their profile and fix it — before it becomes a problem.

🇲🇽 Making Mexican Taxes Simple.

24/06/2025

🏡 What address should I use on my RFC if I live outside of Mexico?

If you’re a foreign resident with Mexican tax residency (or in the process of registering your RFC), but you currently live abroad, this question comes up a lot.

Here’s what you need to know 👇

✅ The SAT requires a Mexican fiscal address for RFC registration.
Even if you live in the U.K., U.S., Canada or elsewhere, your taxpayer profile in Mexico must include an address located in Mexico.

📌 This is based on CFF Article 10 & 27, which states that all individuals registered with the SAT must provide a domicilio fiscal (fiscal address) in national territory.

💬 What kind of address can I use?
You can use:

Your own property in Mexico

The address of a trusted family member or contact

A rental property

A temporary residence with a valid utility bill

🧾 You must present proof of address, such as:

A utility bill

A rental agreement

⚠️ Can I use a foreign address?
No — foreign addresses are not accepted for RFC registration in Mexico. Even if you’re only in the country for part of the year, you’ll still need to provide a valid Mexican address.

At Tax Talk, we help you prepare the documentation you need to get your RFC right the first time — with clarity and legal certainty.

🇲🇽 Making Mexican Taxes Simple.