Employer Social Security Contributions in Mexico:
Complete 2026 Breakdown

If you're modeling the cost of a Mexican hire, the salary you see in an offer letter is not what you'll pay. Mexican employers carry a mandatory social security burden on top of base pay, split across seven separate contribution categories. None of them are optional, and none of them are negotiable.

This is the number CFOs ask for first when they're comparing a Mexican-entity payroll provider against a US/Canada payroll run: what's the real all-in cost per employee. Here's the line-by-line answer.

What employers pay vs. what employees pay

Mexican social security splits contributions between employer (patrón) and employee (trabajador), similar in structure to US FICA but with more categories and no employee opt-out. The employer's share is larger across every category, and three of the seven don't have an employee-side contribution at all: Retiro, Guarderías y Prestaciones Sociales, and INFONAVIT are employer-only.

That asymmetry is the first thing a US or Canadian HR director notices when they see a Mexican payroll breakdown for the first time. It's not a rounding difference, it's a structural one.

IMSS employer contribution rates for 2026

Short answer: IMSS employer contributions in Mexico run about 17% to 27% of the employee's integrated salary in 2026, depending on salary level and the company's occupational risk class. INFONAVIT adds another 5%, and state payroll tax comes on top of both.

IMSS (Instituto Mexicano del Seguro Social) runs five insurance branches, and the employer pays into all of them. Here's what each one costs on the employer side, as of 2026:

That last one, Cesantía en Edad Avanzada y Vejez, catches people off guard because it's not flat. It scales with how many UMAs (Unidad de Medida y Actualización, Mexico's inflation-indexed reference unit) the employee earns, from 3.150% at the lowest tier up to 7.51% once the salary passes 4.01 UMA. A higher earner costs proportionally more in this one category alone.

The 2026 employer rate for each tier is below. It's set by the 2020 pension reform and keeps rising every January until 2030, when the top tier reaches 11.875%, so a budget built on this year's table will be short next year.

The UMA has been $117.31 MXN per day since February 1, 2026. An employee at 4.01 UMA earns about $14,300 MXN a month in integrated salary, so most professional and supervisory roles already sit in the top tier.

INFONAVIT employer contribution rate: 5%

Short answer: the INFONAVIT employer contribution rate is 5% of the employee's integrated salary, capped at 25 UMA a day, paid every two months together with the Retiro and CEAV contributions. The employee pays nothing into it.

Separate from IMSS, every employer pays into INFONAVIT (Instituto del Fondo Nacional de la Vivienda para los Trabajadores). This funds a national housing credit system employees can draw on for a mortgage. It's employer-only, flat, and non-negotiable. No US or Canadian equivalent exists as a mandatory payroll line item, which is usually the second thing that surprises a foreign HR team.

If an employee takes out an INFONAVIT mortgage, you'll also withhold their loan payment from payroll and remit it with the same bimonthly filing. That withholding comes out of their pay, not your cost, but getting it wrong is your liability.

State payroll tax (ISN) on top of federal contributions

Everything above is federal. On top of it, each of Mexico's 32 states charges its own Impuesto Sobre Nómina (State Payroll Tax, ISN), typically 1% to 4% of payroll, with its own rules for what counts as taxable. If you have employees in more than one state, you're filing ISN separately in each one, at each state's rate.

Mexico payroll cost breakdown: one employee, line by line

Short answer: for an employee earning $20,000 MXN a month, the employer pays about $5,400 MXN a month in IMSS and INFONAVIT on top of salary (roughly 27%), plus state payroll tax, plus aguinaldo and vacation premium that accrue through the year.

We ran the numbers for a first-year employee at $20,000 MXN gross per month, with the legal minimum benefits (15 days of aguinaldo, 12 vacation days, 25% vacation premium). Those benefits push the integrated salary IMSS uses to $690.34 a day, or 5.88 UMA, which puts CEAV in the top tier. The company is in occupational risk class III with the starting rate of 2.5984%.

That's a 35% load over gross salary before profit sharing (PTU, 10% of the company's taxable profit, paid each May) and any benefits you add above the legal minimum. An office-only company in risk class I would land closer to $4,945 in IMSS and INFONAVIT, and a class V plant closer to $6,423.

There's a hard ceiling on how high the base can go: contributions cap at 25 UMA per day, roughly $89,156 MXN a month in 2026. Above that, the percentage doesn't keep climbing.

IMSS employer contributions in manufacturing

Short answer: manufacturing pays the same IMSS rates as any other employer, except for Occupational Risk, which is where plants pay far more. A new plant starts at the average rate of its risk class, from 0.54355% (class I) to 7.58875% (class V), and the rate is recalculated every year from its own accident record.

The class comes from the activity fraction IMSS assigns when you register, not from what you think your plant does, so it's worth checking before you build the budget. Each February the company files its annual accident record and the rate for the next twelve months moves up or down, by no more than one percentage point a year. A plant with few incidents can work its way down from the class average; one with repeated claims climbs.

Two more things move the number in a plant. Overtime, shift premiums and attendance bonuses can raise the integrated salary, which is updated every two months for variable pay. And if you bring in a staffing firm to cover the production line itself, that's subcontracting your core activity, which Mexican labor law has banned since 2021; only specialized services outside your main activity, such as security or industrial cleaning, can be outsourced, and only to a provider with a valid REPSE registration.

For the full employer-side breakdown of how this fits into the rest of Mexico payroll, see our guide to managing payroll in Mexico.

How this compares to US payroll burden

US employer payroll tax (FICA, FUTA, SUTA) typically runs 7.65% to 10% of wages, before workers' comp and benefits. Mexico's structure runs three to four times heavier as a percentage, split across more categories, with less flexibility to opt out of any piece of it.

That's not a reason to avoid hiring in Mexico. Labor cost per employee is still substantially lower than the US or Canada even with the heavier social security load on top. It's a reason to model the real number before you quote a client or budget a headcount, instead of discovering the gap after the first payroll run.

Getting this right without an in-country team

Every category above requires registration, monthly calculation, and timely payment to the correct authority, IMSS, INFONAVIT, and the relevant state tax office, with penalties for late or incorrect filings. A Mexican-entity payroll provider carries this as part of the operation, not as a separate compliance project your team has to own from abroad. If your Mexico headcount is still small, a PEO arrangement may fit better than full EOR.

If you're modeling a Mexican hire and want the real number for your specific case, not the general range above, talk to us.