Before you start

A CURP — the RFC is generated from it
Legal status permitting work, if you will be on a Mexican payroll
A comprobante de domicilio under three to four months old
Passport and resident card

Step-by-step

1
Register the RFC once the CURP exists
Inscribe yourself in the Registro Federal de Contribuyentes on the SAT portal using the CURP, or at a SAT appointment with ID and proof of address. Salaried people register under sueldos y salarios. Your employer can also register you in bulk.
OnlineWho: You or your employer's payroll teamOnline, often under an hourFree
2
Get the e.firma and the Constancia de Situación Fiscal
The e.firma digital certificate requires one in-person SAT appointment with fingerprints; the Constancia downloads instantly afterwards. HR, banks and landlords all ask for the Constancia, so treat it as a standing document you refresh rather than a one-off.
In personWho: YouOne appointmentFree
3
Hand HR the RFC and let payroll withhold
Your employer calculates and withholds ISR from every payment, remits it to SAT, and issues a payroll CFDI. You should see the withholding on the payslip. Nothing separate is paid by you.
Via employerWho: Your employerFrom the first payroll run
4
If you are independent, look hard at RESICO
The Régimen Simplificado de Confianza taxes an individual's gross receipts at 1% to 2.5% of ISR, on a band scale, up to an annual ceiling of MXN 3.5 million, with monthly filings and no deductions. For a freelance developer or designer billing Mexican clients it is dramatically lighter than the general regime — but you must elect it, it excludes some situations, and going over the ceiling at any point in the year drops you out of it from the following month.
OnlineWho: Self-employed individualsElected on registration or at the start of a year
5
Understand what actually makes you a Mexican tax resident
Contrary to the day-count rule people repeat, article 9 of the Código Fiscal de la Federación turns on where your casa habitación is. If you also keep a home abroad, Mexico looks at your centre of vital interests — which it deems to be here if more than half your income in the year is Mexican-source, or if the main centre of your professional activities is in Mexico. Renting a flat in Guadalajara and working for a foreign employer can therefore matter more than how many nights you slept here. The separate 183-day figure that circulates is a treaty and non-resident-employment concept, not the residency test. Talk to a cross-border accountant before you move, not after.
OnlineWho: You
6
Pay predial to the right municipality
If you buy, property tax is municipal, not state or federal. Guadalajara, Zapopan and Tlaquepaque set their own rates and their own early-payment discounts, typically largest in January. The bill comes from the municipio where the property sits, and paying the wrong counter is a real error in a nine-municipality metro area.
OnlineWho: Property ownersAnnually, discounted early in the year

Documents you’ll need

CURP
Passport and resident card
Comprobante de domicilio
RFC, Constancia de Situación Fiscal and e.firma
Gensen-style annual withholding summary from your employer, and any CFDIs you issue

Things most newcomers don’t know

RESICO is the most valuable thing an independent professional in Guadalajara can learn about, and nobody mentions it.

The simplified regime taxes an individual's gross receipts at 1% to 2.5%, up to an annual ceiling of MXN 3.5 million, with simple monthly filings and no deduction bookkeeping. For a freelancer invoicing Mexican clients from a city full of contract software work, the difference against the general regime is enormous. It has to be elected, so people who register on autopilot as a general taxpayer often spend a year on the wrong regime.

Source: SAT

Most single-employer salaried people are not required to file at all.

ISR on salaries is withheld at source and reconciled by the employer at year end. If you had one employer issuing proper payroll CFDIs, earned under MXN 400,000 and owe nothing extra, no annual return is required. Newcomers from countries where everyone files assume they have missed a deadline. The flip side is that a second employer in the same year, or crossing that income threshold, makes filing mandatory even though tax was withheld.

Source: SAT

Jalisco's own taxes land on employers and property, not on your payslip.

The 3% state payroll tax is an employer cost and is never deducted from an employee's salary, and Jalisco is not one of the states that levies a cedular tax on rental income. What does reach you personally is municipal: predial on property you own, set by Guadalajara or Zapopan or Tlaquepaque separately, with early-payment discounts that are worth real money in January.

Source: Gobierno de Jalisco

A Mexican payroll does not switch off your home country's tax system.

United States citizens and green-card holders are taxed on worldwide income regardless of residence, so they keep filing with the IRS and rely on the foreign tax credit or the foreign earned income exclusion to avoid double taxation, plus foreign account reporting. Other nationalities need to check whether their home country taxes on residence or citizenship, and whether a treaty with Mexico applies. Assuming the Mexican withholding is the end of it is expensive.

Source: PwC Worldwide Tax Summaries

Common mistakes to avoid

Registering as a general-regime taxpayer without checking whether RESICO fits.
Assuming no return is ever required after a year with two employers or income over MXN 400,000.
Assuming a day count decides your tax residency — Mexico looks at where your home and your centre of vital interests are.
Letting the four-year e.firma lapse and hitting a wall at filing time.
Paying predial to the wrong municipality, or missing the January discount window.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.

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