In the Philippine legal landscape, Non-Governmental Organizations (NGOs) are generally treated as private employers. Consequently, the retirement of their employees is governed primarily by the Labor Code of the Philippines, specifically Article 302 (formerly Article 287), as amended by Republic Act No. 7641 (The Retirement Pay Law).

While NGOs often operate with a social mission, they are not exempt from the statutory obligations regarding the security of tenure and the eventual retirement of their workforce.

I. Statutory Retirement Age

The law distinguishes between two types of retirement: optional and compulsory.

1. Optional Retirement

An employee of an NGO may choose to retire upon reaching the age of sixty (60) years, provided they have served at least five (5) years in the organization. This is a right granted to the employee, and the employer cannot deny the application if these two conditions are met.

2. Compulsory Retirement

Retirement becomes mandatory when an employee reaches the age of sixty-five (65) years. At this point, the employer has the right to terminate the employment relationship based on age, and the employee is legally required to retire, unless the employment contract or a Collective Bargaining Agreement (CBA) provides for a higher age.

II. Retirement Benefits and Calculation

In the absence of a retirement plan or agreement in the NGO, an employee is entitled to retirement pay equivalent to at least one-half (1/2) month salary for every year of service. A fraction of at least six (6) months is considered as one whole year.

The "Half-Month Salary" Formula

The term "one-half month salary" is a legal misnomer, as it actually encompasses more than 15 days of pay. Under the law and its implementing rules, it includes:

Fifteen (15) days salary based on the latest salary rate;
Five (5) days of service incentive leave (SIL);
One-twelfth (1/12) of the 13th-month pay.

Mathematically, the "half-month" salary is equivalent to 22.5 days per year of service. The total retirement pay is calculated as follows:

$$\text{Retirement Pay} = (\text{Daily Rate} \times 22.5) \times \text{Years of Service}$$

III. Applicability and Exemptions

The Retirement Pay Law applies to all employees in the private sector, regardless of their position or the nature of the employer’s business (profit or non-profit). However, certain entities are exempt:

Retail, service, and agricultural establishments regularly employing not more than ten (10) employees.
Government employees, who are covered by the GSIS (Government Service Insurance System) rather than the Labor Code.

For NGOs, the size of the workforce is the critical factor. An NGO with fewer than ten employees may be exempt from the mandatory retirement pay requirement under RA 7641, though they must still comply with SSS (Social Security System) contributions.

IV. Retirement via Contract vs. Law

NGOs may establish their own retirement plans through employment contracts or personnel policies.

Earlier Retirement: An NGO and its employees can agree on a retirement age lower than 60 (e.g., 55 years). Such agreements are valid and enforceable.
Superior Benefits: If the NGO’s internal retirement plan provides benefits higher than the 22.5 days per year of service required by law, the NGO must honor the higher amount. Conversely, if the NGO plan offers less than the law, the Labor Code's minimum (RA 7641) will prevail.

V. Tax Treatment of Retirement Pay

Under Republic Act No. 4917 and Section 32 (B)(6)(a) of the National Internal Revenue Code, retirement benefits received by officials and employees of private firms (including NGOs) are exempt from income tax, provided:

The employer has a reasonable retirement plan approved by the Bureau of Internal Revenue (BIR);
The retiring employee has been in the service of the same employer for at least ten (10) years;
The employee is at least fifty (50) years of age at the time of retirement; and
The tax exemption is availed of only once.

If the retirement is "compulsory" at age 65, the benefits are generally exempt from tax even if the 10-year service requirement is not met, as the separation is considered involuntary.

VI. Jurisprudence on NGO Financial Constraints

The Supreme Court of the Philippines has consistently held that the "non-profit" nature of an organization or its "financial distress" does not automatically excuse it from paying retirement benefits. Since retirement pay is a vested right earned through years of service, NGOs are expected to manage their grants and funding to include provisions for the retirement of their staff. Failure to pay the mandated retirement benefits can lead to a case for illegal dismissal or money claims before the National Labor Relations Commission (NLRC).