How Much Does It Cost to Hire Someone in Mexico? Employer Payroll Taxes Explained
Managing payroll in Mexico requires more than calculating gross salary and withholding income tax. Employers must fund several mandatory social security, retirement, housing and state-level obligations.
However, each employer contribution follows its own calculation rules.
Some contributions use the employee’s Salario Base de Cotización (SBC). Others depend on the Unidad de Medida y Actualización (UMA). In addition, the employer contribution for Cesantía y Vejez now varies according to the employee’s salary band.
Therefore, international employers need to understand both the applicable rates and the calculation bases behind them.
This guide explains employer contributions in Mexico, the main payroll concepts and the calculation process. It also provides a practical example to help employers estimate their real employment costs.
Key Takeaways
What Are Employer Contributions in Mexico?
Employer contributions in Mexico are mandatory payroll costs paid by the employer in addition to an employee’s gross salary.
These contributions finance Mexico’s social security, healthcare, retirement and housing systems. Employers also pay a state-level payroll tax known as the Impuesto Sobre Nóminas (ISN).
The Instituto Mexicano del Seguro Social manages the mandatory social security system known as IMSS.
The mandatory IMSS system includes five principal insurance branches: Work Risk, Health and Maternity, Disability and Life, Retirement and Old Age, and Childcare and Social Benefits.
Therefore, the cost of hiring an employee in Mexico exceeds the agreed gross salary.
An employer may need to fund:
Work Risk Insurance
Health and Maternity Insurance
Disability and Life Insurance
Retirement Insurance
Cesantía en Edad Avanzada y Vejez
Childcare and Social Benefits
INFONAVIT
State Payroll Tax (ISN)
The employee may also contribute to certain social security branches. However, the employer withholds the employee portion through payroll.
For international companies, this distinction matters. Employer contributions represent an additional employment cost. Employee contributions reduce the employee’s net salary.
Understanding both sides helps companies calculate the real cost of employment in Mexico.
Payroll Concepts Employers Must Understand
Before calculating employer contributions in Mexico, employers must understand three fundamental payroll concepts.
These are the UMA, the Salario Base de Cotización, and the Factor de Integración.
What Is Unidad de Medida y Actualización (UMA) in Mexico?
The Unidad de Medida y Actualización, commonly called UMA, is an economic reference unit used throughout Mexican legislation. Instituto Nacional de Estadística y Geografía (INEGI) updates the UMA annually.
Daily UMA
MXN 117.31
from Feb 1, 2026
Monthly UMA
MXN 3,566.22
from Feb 1, 2026
Annual UMA
MXN 42,794.64
from Feb 1, 2026
The UMA matters because Mexican payroll rules use it for several contribution limits and calculation thresholds. For example, the Health and Maternity contribution on salary excess uses a threshold based on three UMA.
In addition, the SBC has a statutory maximum of 25 UMA under the Social Security Law.
What Is Salario Base de Cotización (SBC) in Mexico?
The Salario Base de Cotización, or SBC, is the contribution salary used for Mexican social security calculations. It does not necessarily equal the employee’s base salary. Instead, the SBC considers salary and applicable integrated compensation elements.
Depending on the compensation structure, these elements may include regular payments, commissions and other benefits that integrate into the contribution salary.
Details of Employer Contributions in Mexico
Employer contributions in Mexico do not follow one single rate.
Instead, employers must calculate several insurance and payroll obligations separately.
The following table summarizes the main employer payroll costs.
| Contribution | Frequency | Employer Rate | Calculation Base | Paid By |
|---|---|---|---|---|
| Work Risk Insurance | Monthly | 0.54355% – 7.58875% * | SBC | Employer |
| Health & Maternity – Fixed Fee | Monthly | 20.40% | UMA-based amount | Employer |
| Health & Maternity – Cash Benefits | Monthly | 0.70% | SBC | Employer |
| Medical Expenses for Pensioners | Monthly | 1.05% | SBC | Employer |
| Health & Maternity – Excess | Monthly | 1.10% | SBC excess above 3 UMA | Employer |
| Disability & Life | Monthly | 1.75% | SBC | Employer |
| Retirement | Bimonthly | 2.00% | SBC | Employer |
| Cesantía y Vejez (CEAV) | Bimonthly | 3.15% – 7.513% in 2026 | SBC | Employer |
| Childcare & Social Benefits | Monthly | 1.00% | SBC | Employer |
| INFONAVIT | Bimonthly | 5.00% | Applicable salary base | Employer |
| State Payroll Tax (ISN) | State rules | Varies by state | Taxable payroll | Employer |
* The exact Work Risk rate depends on the employer’s risk classification and applicable premium.
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Breaking Down IMSS Contributions by Insurance Category
Work Risk Insurance — Riesgos de Trabajo
Work Risk Insurance covers occupational accidents and work-related illnesses. The employer pays the entire contribution. However, the applicable rate depends on the company’s risk classification and experience. Employers should never apply a generic Work Risk rate without confirming the company’s classification.
| Risk Class | Average Premium |
|---|---|
| Class I | 0.54355% |
| Class II | 1.13065% |
| Class III | 2.59840% |
| Class IV | 4.65325% |
| Class V | 7.58875% |
Health and Maternity Insurance — Enfermedades y Maternidad
Health and Maternity Insurance finances healthcare and maternity-related social security protection. However, this insurance contains several calculation components. Combining them into one generic IMSS rate can create payroll errors.
Fixed Fee — Cuota Fija
Base: UMA-based reference
Percentage: 20,40%
Additional on Salary Above 3 UMA
Base: SBC excess above 3 UMA
Percentage: 1,10%
Cash Benefits — Prestaciones en Dinero
Base: SBC
Percentage: 0,70%
Medical Expenses for Pensioners
Base: SBC
Percentage: 1,05%
Disability and Life Insurance — Invalidez y Vida
Invalidez y Vida provides financial protection when an insured employee experiences a qualifying disability, and protection for eligible beneficiaries in the event of death. The employer contribution is 1.75% of the SBC. Employees also fund an employee portion through payroll withholding. However, the 1.75% rate represents the employer component.
Retirement Insurance — Retiro
The Retiro branch finances the employee’s retirement savings. The employer contributes 2% of the SBC. Retirement and related RCV obligations operate on a bimonthly payment cycle.
Cesantía en Edad Avanzada y Vejez (CEAV) — Progressive Rates
Cesantía y Vejez requires particular attention. Historically, employers often used a 3.15% reference rate. However, the pension reform introduced progressive employer rates. The applicable employer contribution now depends on the employee’s SBC band, and rates progressively increase until 2030.
Childcare and Social Benefits — Guarderías y Prestaciones Sociales
The employer contributes 1% of the SBC to Guarderías y Prestaciones Sociales. This contribution finances childcare services and social welfare programs administered through IMSS. The employer bears the full contribution.
INFONAVIT — Housing Fund
Employers must contribute to the employee’s housing savings system through Instituto del Fondo Nacional de la Vivienda para los Trabajadores. The statutory employer contribution equals 5% of the employee’s applicable integrated salary base. INFONAVIT employer contributions follow a bimonthly payment cycle.
Important note
Payroll may also include employee housing loan deductions. Employers should not confuse these deductions with the statutory 5% employer contribution.
State Payroll Tax — ISN (Impuesto Sobre Nóminas)
The Impuesto Sobre Nóminas, or ISN, is a state payroll tax. Mexico does not impose one uniform federal payroll tax rate. Instead, Mexican states apply their own payroll tax rules.
Example of Employer Contributions in Mexico
A simplified employer cost example for an employee with a monthly gross salary of MXN 30,000 and statutory minimum benefits.
Step 1: Calculate the Daily Salary
MXN 30,000 ÷ 30 = MXN 1,000
The daily salary is MXN 1,000.
Step 2: Calculate the Daily Contribution Base
The general formula is SBC = (SDI x 365 + SDI x 12 x 25% + SDI x 15) / 365 for employee with legally mandated benefits
Here: SBC = 1,049.31
Step 3: Calculate the Monthly Contribution Base
The monthly contribution base depends on the number of days there are in a month.
Here we'll continue for a month with 30 days.
Step 4: Estimate the Main Employer Contributions
| Employer Contribution | Simplified Calculation | Estimated Cost |
|---|---|---|
| Work Risk – Class I | 31,479 × 0.54355% | MXN 171.10 |
| Cash Benefits | 31,479 × 0.70% | MXN 220.35 |
| Pensioner Medical Expenses | 31,479 × 1.05% | MXN 330.53 |
| Health Excess Contribution | (1,049.30 − 351.93) × 30 × 1.10% | MXN 230.13 |
| Disability & Life | 31,479 × 1.75% | MXN 550.88 |
| Retirement | 31,479 × 2.00% | MXN 629.58 |
| CEAV – 2026 Highest Band | 31,479 × 7.513% | MXN 2,365.82 |
| Childcare & Social Benefits | 31,479 × 1.00% | MXN 314.79 |
| INFONAVIT | 31,479 × 5.00% | MXN 1,573.95 |
| Health & Maternity – Fixed Fee | 20.40% × MXN 3,566.22 (monthly UMA) | MXN 727.51 |
| State Payroll Tax (ISN) | MXN 30,000 × 4% (Mexico City example) | MXN 1,200.00 |
This example remains illustrative. Actual payroll calculations depend on contribution days, salary movements, absences, benefits, SBC integration and the applicable state tax base. Employers should never use a generic percentage to estimate the final payroll liability.
Best Practices for Managing Employer Contributions
Payroll errors often result from incorrect calculation bases rather than incorrect percentages.
Review the SBC on compensation changes
Salary increases, recurring bonuses and benefit changes may affect the contribution salary.
Update the UMA every year
The 2026 UMA values became effective on February 1, 2026. Update payroll systems promptly.
Track CEAV rates by salary band
Do not apply a universal 3.15% employer rate — rates now vary by band and year.
Confirm the Work Risk classification
The applicable premium can materially change employer costs across risk classes.
Separate employer and employee contributions
This distinction supports accurate gross-to-net and employer-cost calculations.
Review benefits before implementation
A benefit's payroll treatment can affect the SBC and several downstream contributions.
Confirm the applicable ISN rate and base
State payroll rules differ across Mexico. Review each local framework separately.
Accrue bimonthly costs monthly for budgets
Retirement, CEAV and INFONAVIT payment cycles should not distort monthly cost forecasts.
Reconcile payroll vs. social security calculations
Investigate differences between payroll records and contribution calculations promptly.
The Real Cost of Employment in Mexico
International employers should estimate the total employment cost before confirming a gross salary. A MXN 100,000 salary does not represent a MXN 100,000 monthly employment cost. Social security, housing, retirement, payroll taxes and statutory benefits can materially increase the final employer budget.
Conclusion
Understanding employer contributions in Mexico is essential for compliant payroll and accurate workforce budgeting. The calculation starts with the employee’s compensation structure. Employers must then determine the correct SBC and integration factor. Next, each contribution requires its own calculation.
Work Risk depends on the company’s risk classification. Health and Maternity uses several separate bases. CEAV rates vary according to the employee’s salary band. INFONAVIT requires a 5% employer contribution. Finally, ISN depends on state rules.
Moreover, payroll costs continue to evolve. The progressive CEAV contribution schedule will increase employer costs through 2030. Meanwhile, annual UMA updates can change payroll thresholds and contribution limits. For this reason, companies should treat Mexican payroll as an ongoing compliance process.
Frequently Asked Questions (FAQ)
What are employer contributions in Mexico?
Employer contributions are mandatory payroll costs paid by employers in addition to gross salary. They include IMSS insurance contributions, retirement funding, INFONAVIT and state payroll taxes.
How much does an employer contribute to IMSS in Mexico?
There is no single employer IMSS percentage. The total depends on the employee’s SBC, UMA thresholds, Work Risk classification and applicable CEAV salary band.
What is the Salario Base de Cotización?
The Salario Base de Cotización, or SBC, is the contribution salary used for many Mexican social security calculations. It may include salary and other integrated compensation elements, and does not necessarily equal the employee’s base salary.
What is the UMA value in Mexico for 2026?
The 2026 daily UMA is MXN 117.31.
Is the CEAV employer contribution always 3.15%?
No. The employer rate depends on the employee’s SBC band. In 2026, rates range from 3.15% to 7.513%. The maximum scheduled rate reaches 11.875% in 2030.
How much does an employer contribute to INFONAVIT?
Employers contribute 5% of the applicable employee salary base to INFONAVIT on a bimonthly payment cycle.
Who pays the ISN payroll tax in Mexico?
The employer generally pays the state payroll tax. The applicable rate and taxable base depend on the Mexican state. Mexico City, for example, applies a 4% rate.
Are employer contributions calculated on gross salary?
How often are IMSS contributions paid?
Can an Employer of Record manage employer contributions in Mexico?
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