HOW TO

13th-Month Pay Computation: Step-By-Step Guide for Employers

Written by Salary.com Staff

June 27, 2025

13th-Month Pay Computation: Step-By-Step Guide for Employers
Here are three steps to calculate the 13th-month pay:
  1. Step 1: Establish the general formula
  2. Step 2: Determine the total base salary
  3. Step 3: Divide the value by 12

The Bureau of Labor Statistics (BLS) reported that only 12% of private industry workers and 2% of state and local government workers were paid end-of-year bonuses. Although it’s generally not a practice in the US, giving your employees additional rewards and incentives can still yield positive results.

The concept of the 13th-month pay is an essential part of compensation in many countries, providing employees with an additional month’s salary at the end of the year. For employers, understanding the intricacies of 13th-month pay computation is crucial to ensure compliance with local labor laws, maintain employee satisfaction, and effectively manage payroll.

In this comprehensive guide, we’ll break down everything employers need to know about thirteenth-month pay. What is it, exactly? Who is eligible? What are the factors affecting it? Most importantly, how do you compute 13th-month pay accurately? Let’s find out!

What is the 13th-month pay? 

The 13th-month pay is an incentive in addition to the employee's annual salary, typically at the end of the calendar year, and is typically equivalent to one month’s salary. Unlike discretionary bonuses, the 13th-month salary is a legal obligation in many countries, designed to provide employees with extra financial support during the holiday season.

This extra payment is often mandated by local labor laws or collective agreements and is separate from other forms of bonus pay, such as performance, holiday bonuses, or Christmas bonuses.

As an employer, you should properly prepare for additional compensation expenses like these through a robust total compensation management. Using the Compensation Planning Software will help you customize compensation packages and continue to incentivize without compromise.

Who is eligible to receive 13th-month pay? 

Eligibility for the 13th-month pay depends on a lot of factors, such as local regulations, employment status, and the terms of the employment contract. Generally, the following employees are eligible:

  1. Rank and file employees: Most countries require employers to pay the 13th-month salary to non-managerial staff.

  2. Full-time employees: Regular employees with a fixed monthly salary are typically covered.

  3. Certain employees: In some countries, temporary employees, civil servants, and international employees may also be eligible, depending on specific rules or collective bargaining agreements.

  4. Newly hired employees: Employees who have worked less than a year usually receive a prorated amount based on the number of months worked.

Establishing reliable talent management systems could help your company easily classify which employees in the workforce are eligible to receive a 13th-month pay.

What are the 13th-month pay countries? 

While the 13th-month pay is a legal requirement in many countries, it is not universal. Here are some regions and countries where employers pay a 13th-month salary:

  • Latin and South America: Brazil, Argentina, and Mexico.

  • Europe: Italy, Spain, and Portugal offer an annual wage supplement, often split into two installments—13th and 14th month pay.

  • Asia: The Philippines, Indonesia, and India.

  • Other countries: Some African and Middle Eastern countries have similar practices, though not legally required.

Factors affecting the 13th-month pay 

Understanding the factors that influence 13th-month pay computation is vital for both employers and employees. These factors include:

  • Basic salary

  • Duration of employment

  • Legal obligations

  • Leaves of absence

  • How payment differs from other bonuses

Utilizing the Compensation Planning Software can help you easily plan your merit, bonus, equity, and reward pay systems, such as the 13th-month pay computation.

Is the 13th-month pay taxed? 

The tax treatment of the 13th-month pay varies by country and company policy:

  1. Tax-exempt up to a cap: There are instances when the 13th-month pay is tax-exempt up to a certain salary cap.

  2. Fully taxable: In some countries, the 13th-month salary is treated as regular income and subject to income tax.

  3. Special tax rules: Certain countries have specific rules for the tax treatment of annual wage supplements.

Is the 13th-month pay mandatory? 

No, the 13th-month pay isn’t mandatory in the US. Usually, it is only provided if stipulated in the employment contract or collective agreements. Therefore, employers must verify whether the payment is a legal obligation or an optional benefit in their country of operation.

However, in many countries such as the Philippines, India, Singapore, Brazil, etc., the 13th month pay is a legal requirement, and non-compliance can result in penalties.

How to calculate the 13th-month pay 

An accurate 13th-month pay computation is essential to avoid legal issues and ensure employees receive their entitled compensation. Here’s a step-by-step guide on how to compute 13th-month pay:

13th-Month Pay Computation: Step-By-Step Guide for Employers
  1. Step 1: Establish the general formula

    The most common formula for calculating the 13th-month pay is:

    13th month pay = Total basic salary earned during the year / 12

    • Total basic salary: This refers to the employee’s total base salary, excluding allowances, overtime, and other additional compensation.

    • 12: Represents the number of months in a calendar year.

    Compensation Planning Software allows you to mitigate errors, apply centralized planning, and streamline collaboration for better and more efficient pay practices in simplifying employee benefits.

  2. Step 2: Determine the total base salary

    To compute the 13th-month salary, you need to sum up the employee’s base monthly salary for each month worked within the calendar year. This includes:

    • Regular monthly pay: For employees who have worked the entire year.

    • Prorated amount: For newly hired employees or those who have not completed a full year, only the months worked are included.

    • Unpaid absences: Deductions may apply if the employee has unpaid leave, as these reduce the total basic salary.

    Example: If an employee’s monthly salary is $2,000 and they worked for 10 months, the total basic salary is $20,000.

  3. Step 3: Divide the value by 12

    Once you have the total basic salary, divide it by 12 to get the 13th-month pay.

    Example: $20,000 (total basic salary) ÷ 12 = $1,666.67 (13th month pay)

This formula ensures that employees who have worked less than a year receive a prorated amount.

13th-month pay computation examples 

Let’s look at some practical examples to illustrate how to compute 13th-month pay for different scenarios:

Example 1: Full-year employee

If Joe is a full-time employee earning a monthly salary of $3,000, how much would his 13th-month pay be if he worked the whole 12 months a year?

Total basic salary = $3,000 x 12 = $36,000

13th month pay = $36,000 ÷ 12 = $3,000

Example 2: Newly hired employee (less than a year)

Chris is a full-time worker with a monthly salary of $2,500. How much would his 13th-month pay be if he only worked for 8 months for the year?

Total basic salary = $2,500 × 8 = $20,000

13th month pay = $20,000 ÷ 12 = $1,666.67

Example 3: Employee with unpaid absences

Jordan is a full-time worker earning a monthly salary of $2,000. If he worked the full 12 months of the year but had 1 outstanding month of unpaid absences, how much would his 13th-month pay be?

Total basic salary = $2,000 × 11 = $22,000

13th month pay = $22,000 ÷ 12 = $1,833.33

Example 4: Employee with a salary increase during the year

Stephen’s monthly salary from January to June was $2,000. Due to his great job performance, his salary was increased to $2,500 starting in July. If he worked for the full 12 months, how much would his 13th-month pay be?

Total basic salary = ($2,000 × 6) + ($2,500 × 6) = $12,000 + $15,000 = $27,000

13th month pay = $27,000 ÷ 12 = $2,250

The 13th-month pay is a vital component of annual compensation in many countries, providing employees with an additional month’s salary and helping employers foster goodwill and compliance with local labor laws.

By understanding the legal requirements, eligibility criteria, and 13th-month pay computation methods, employers can confidently manage payroll and ensure their teams enjoy competitive compensation.

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