How to Calculate Daily Pay Rate in Mexico (Employer Guide)
Learn how to calculate daily pay rate in Mexico using salary, SDI, and payroll rules. Includes formulas, examples, and compliance tips for employers.
Calculating the daily pay rate in Mexico sounds simple. It is not. Mexican labor law uses daily salary as the foundation for almost every statutory obligation, from IMSS contributions to severance payments to aguinaldo.
Using the wrong figure, or the wrong version of the daily rate, creates compliance errors that compound across your entire payroll. This guide walks you through every step clearly and correctly.
Step 1: Determine What You Actually Need to Calculate
Before running any numbers, you need to know which version of the daily pay rate applies to your situation. Mexico uses several distinct salary concepts, and mixing them up is one of the most common and costly mistakes foreign employers make.
Ask yourself what you are calculating:
Base daily salary for payroll? This is the standard daily wage used for regular pay cycles and most internal calculations.
Integrated Daily Salary (SDI)? This is the base salary plus the proportional value of statutory benefits. It is used for IMSS contributions and severance.
IMSS contribution salary (SBC)? The Salario Base de Cotizacion is the figure reported to IMSS. It is closely aligned with SDI and must be kept current.
Severance or termination payout? Termination calculations use the integrated salary, not the base daily salary.
Using the wrong version causes direct compliance errors. Underreporting SDI to IMSS triggers contribution shortfalls and audit exposure.
Using base salary instead of integrated salary for severance underpays the employee and creates labor dispute risk.
Mexico uses daily salary as the legal wage reference point for nearly all employment law calculations. Understanding which daily figure applies to each situation is the starting point for accurate, compliant payroll management.
Step 2: How to Calculate the Basic Daily Pay Rate
Once you know what you need, the base daily pay rate calculation is straightforward. The correct method depends on how the employee's salary is structured.
Option A: Monthly Salary Method (Most Common)
Daily Pay = Monthly Gross Salary ÷ 30
This is the standard method for salaried employees in Mexico. Mexican law defines the working month as 30 days for salary conversion purposes, regardless of how many calendar days are in the month.
Example: An employee earns MXN 18,000 per month.
Daily Pay = 18,000 ÷ 30 = MXN 600 per day
This figure is used for standard pay period calculations, benefit computations, and as the starting point for SDI integration.
Option B: Annual Salary Method
Daily Pay = Annual Salary ÷ 365
Used when an employee's compensation is structured on an annual basis. This method provides a consistent daily reference for legal calculations across the full year.
Example: An employee earns MXN 216,000 per year.
Daily Pay = 216,000 ÷ 365 = MXN 591.78 per day
Option C: Weekly Salary Method
Daily Pay = Weekly Salary ÷ 7
Used for employees paid on a weekly basis. Mexico counts all seven days of the week in the daily rate calculation, not just working days.
Example: An employee earns MXN 4,200 per week.
Daily Pay = 4,200 ÷ 7 = MXN 600 per day
Always confirm the gross salary figure before dividing. The calculation must reflect total base compensation before any deductions.
Step 3: Understand the Difference Between Daily Salary and Integrated Daily Salary (SDI)
This is where most employer guides fail to give a clear explanation, and where most compliance errors originate.
There are three related but distinct salary concepts you must understand:
Daily Salary is simply the base wage per day. It is the figure you calculated in Step 2. It reflects what the employee earns before statutory benefits are factored in.
Integrated Daily Salary (SDI) is the daily salary plus the proportional daily value of statutory benefits the employee is entitled to by law. These benefits have real monetary value that accrues daily, even though they are paid at specific times of the year. The SDI reflects the true daily cost of employment.
Salario Base de Cotizacion (SBC) is the salary figure reported to IMSS for contribution purposes. It is generally aligned with the SDI and must be updated whenever salary or benefits change. Learn more about SBC recalculation rules and when updates are required.
Why this distinction matters:
IMSS contributions are calculated based on SDI, not base daily salary. Underreporting SDI means underpaying contributions, which triggers penalties and back payments during audits.
Severance calculations use the integrated salary. Using only the base salary for termination payouts underpays the employee and creates grounds for a labor dispute.
CFDI payroll receipts must accurately reflect the salary structure used for each payment type. Mismatches between reported figures and actual payments are a primary audit trigger.
If you report only the base daily salary to IMSS when the correct figure is the SDI, you are non-compliant from day one of employment.
Step 4: How to Calculate the Integrated Daily Salary (SDI)
The SDI calculation requires you to determine the proportional daily value of each statutory benefit and add it to the base daily salary. Follow these steps precisely.
Identify Statutory Benefits to Integrate
The three core statutory benefits that must always be integrated are:
Aguinaldo: Minimum 15 days of salary per year, paid in December.
Vacation days: Based on the employee's seniority. Employees receive a minimum of 12 days after year one, increasing with each additional year of service. See the full vacation accrual schedule.
Vacation Bonus: Minimum 25% of the daily salary for each vacation day taken.
Calculate the Integration Factor
The integration factor converts these annual benefit days into a daily multiplier that is applied to the base salary.
Integration Factor = (365 + aguinaldo days + vacation bonus equivalent days) ÷ 365
To calculate the vacation bonus equivalent days, multiply the number of vacation days by the premium percentage:
Vacation premium days = Vacation days × 25%
Example for a first-year employee with minimum statutory benefits:
Aguinaldo: 15 days
Vacation days: 12 days
Vacation bonus: 12 × 25% = 3 days
Integration Factor = (365 + 15 + 3) ÷ 365 = 383 ÷ 365 = 1.0493
Apply the Factor
SDI = Daily Salary × Integration Factor
Full numerical example:
An employee earns MXN 18,000 per month. Base daily salary = 18,000 ÷ 30 = MXN 600
Integration factor for a first-year employee = 1.0493
SDI = 600 × 1.0493 = MXN 629.58 per day
This is the figure used for IMSS reporting and severance calculations, not the base MXN 600. The difference of MXN 29.58 per day compounds significantly across a full year of IMSS contributions for every employee on your payroll.
As seniority increases and vacation days grow, the integration factor increases as well. Recalculate SDI every time vacation entitlement changes or salary is adjusted.
Step 5: How Daily Pay Rate Is Used in Real Payroll Scenarios
The daily pay rate is not just a payroll input. It drives nearly every statutory calculation in Mexican employment law. Here is how it applies in practice:
Overtime calculation: Overtime in Mexico is calculated as a multiple of the daily pay rate divided by the standard working hours. The first 9 hours of weekly overtime are paid at double the regular hourly rate. Hours beyond that are paid at triple rate. The hourly rate is derived directly from the daily salary.
Holiday pay: Employees who work on a mandatory public holiday are entitled to triple pay for that day. The base for this calculation is the daily salary. Employees who do not work on a public holiday still receive their regular daily salary for that day.
Aguinaldo computation: The Christmas bonus is calculated as a minimum of 15 days of daily salary, proportional to the months worked during the year. The daily salary figure used must be the base salary at the time of payment.
Vacation pay and premium: Vacation pay is calculated based on the daily salary multiplied by the number of vacation days entitled. The vacation premium is an additional 25% minimum on top of that figure.
Severance (finiquito and liquidacion): Termination payments in Mexico are calculated using the integrated daily salary, not the base rate. A standard liquidacion includes 3 months of integrated salary plus 20 days per year of service plus a seniority bonus. Using the wrong salary base in a termination payout is a direct labor law violation.
IMSS and INFONAVIT contributions: Both are calculated using the SDI or SBC. The contribution rates are applied to the integrated daily salary multiplied by the number of days in the contribution period.
Step 6: Compliance Requirements Employers Must Not Ignore
Calculating the daily pay rate correctly is only part of the obligation. You must also ensure that figure is reported and maintained correctly across all official systems.
IMSS registration must reflect correct SDI:
When you register an employee with IMSS, the SBC you report must equal or exceed the correctly calculated SDI. Underreporting, even by a small amount, is a compliance violation that carries penalties and retroactive contribution obligations. See current IMSS social security requirements.CFDI payroll receipts must match salary structure:
Every payment made to an employee must be supported by a CFDI electronic payslip that accurately reflects the salary type, amount, and applicable deductions. Mismatches between CFDI data and IMSS records are a primary trigger for payroll audits.Minimum wage compliance:
The daily salary must meet or exceed the current legal minimum wage. Mexico has a general minimum wage and a higher rate for the northern border zone. Verify which applies to your employees' work location.Updating SDI when salary changes:
Any salary increase requires an immediate SBC update with IMSS. You have a short legal window to report the change. Failing to update means your contributions are based on an outdated and incorrect figure. See SBC recalculation rules for 2026.Annual benefit changes affecting integration factor: As employees gain seniority, their vacation entitlement increases and the integration factor changes. The SDI must be recalculated and the SBC updated at each anniversary date.
Common Mistakes When Calculating Daily Pay Rate in Mexico
These errors appear consistently in foreign-run payrolls and are among the most common findings in payroll audits.
Using 30.4 days instead of 30: Mexican labor law uses 30 as the monthly divisor for salary conversion. Using 30.4 produces a lower daily rate and underpays statutory benefits across every calculation.
Forgetting to integrate statutory benefits: Calculating and reporting only the base daily salary to IMSS is non-compliant. The SDI must include the proportional value of aguinaldo, vacation, and vacation premium at minimum.
Including PTU incorrectly in SDI: Profit sharing (PTU) is explicitly excluded from the SDI integration calculation under Mexican law. Including it inflates the SDI and produces incorrect IMSS contributions.
Miscalculating vacation premium proportion: The vacation premium is 25% of the daily salary per vacation day, not 25% of the total annual salary. Applying the percentage to the wrong base figure distorts the integration factor.
Failing to update SDI after a salary increase: Every salary adjustment requires a corresponding SBC update with IMSS. Many employers update internal payroll systems but forget to file the change with IMSS, creating a growing discrepancy over time.
Confusing SDI with taxable base: The SDI used for IMSS contributions is not the same as the taxable income base used for ISR withholding. These are separate calculations and must not be substituted for each other.
What if the employee works part-year?
If an employee starts or leaves mid-year, statutory benefit calculations are prorated based on actual days worked. For aguinaldo, divide the total days worked by 365 and multiply by 15 to determine the proportional entitlement. The same proportional logic applies to vacation accrual.
What if salary changes mid-year?
Use the salary in effect during each period for period-specific calculations. For annual benefits like aguinaldo, some employers use the salary at the time of payment, which is the most common and legally conservative approach. Update IMSS records immediately when the change takes effect.
What if bonuses are recurring?
Regular, predictable bonuses may need to be integrated into the SDI depending on their nature and frequency. One-time discretionary bonuses are generally excluded. Recurring guaranteed bonuses that form a consistent part of compensation are treated as salary components and must be integrated. Review with a local compliance specialist if in doubt.
What if the employee is paid hourly?
Convert the hourly rate to a daily rate by multiplying by the number of contracted daily hours. Then apply the same integration formula. The minimum wage floor still applies on a daily basis, so verify that the daily equivalent meets or exceeds the legal minimum.
What if you are using an Employer of Record (EOR) in Mexico?
When you hire through an Employer of Record in Mexico, the EOR calculates, reports, and maintains all daily salary figures including SDI and SBC on your behalf.
The EOR registers each employee with IMSS at the correct integrated salary from day one, updates the SBC when salary changes occur, and ensures CFDI payslips reflect the correct figures.
Your responsibility is to provide accurate salary information and approve changes promptly. The EOR absorbs the compliance execution risk.
Practical Checklist: How to Calculate Daily Pay Rate in Mexico
Use this checklist for every new hire and every salary change to ensure your payroll is compliant from the start.
Confirm gross salary structure: Identify whether salary is monthly, weekly, or annual and confirm the total gross amount before any deductions.
Choose the correct calculation method: Divide by 30 for monthly, 7 for weekly, or 365 for annual salary structures.
Calculate the base daily salary: Apply the correct divisor and confirm the result exceeds the applicable minimum wage.
Determine statutory benefit values: Identify aguinaldo days, vacation days based on seniority, and vacation premium percentage to use in integration.
Apply the integration factor: Calculate the factor using the formula and multiply by the base daily salary to arrive at the correct SDI.
Verify IMSS reporting: Confirm the SBC reported to IMSS matches the calculated SDI. File an update immediately if there is any discrepancy.
Document the calculation for audit purposes: Keep a written record of the salary structure, integration factor, and resulting SDI for every employee. Retain this documentation for a minimum of five years.
Conclusion: Why Accurate Daily Pay Calculation Matters in Mexico
The daily pay rate is not a minor administrative detail in Mexican payroll. It is the foundation of every statutory obligation your company carries toward each employee.
Daily salary drives almost every statutory benefit.
Incorrect calculation increases labor liability.
Payroll compliance in Mexico depends on precise integration.
Proper calculation prevents IMSS penalties and labor disputes.
Whether you manage payroll directly through a Mexican entity or operate through a REPSE-registered EOR, daily pay rate accuracy is non-negotiable.
Human Resources Mexico (HRM) calculates, integrates, and reports every employee's salary correctly from day one, ensuring your payroll is compliant, your IMSS records are accurate, and your statutory benefit obligations are met without gaps.
If you want to hire in Mexico and stay compliant, reach out andrequest a custom hiring proposal for your needs.
