In Philippine labor law, the general rule is no: overtime pay and holiday pay are not included in the computation of the 13th month pay.

That rule comes from the legal concept of “basic salary”, because 13th month pay is computed based only on the employee’s basic salary earned within the calendar year. Overtime premiums, holiday pay, night shift differential, premium pay for rest days or special days, allowances, and similar extra compensation are generally not part of basic salary for this purpose.

That is the short legal answer. But the full rule has important details, exceptions, and practical consequences. In Philippine practice, disputes usually arise not from the formula itself, but from confusion over what counts as basic salary, what counts as salary-related benefits, and what happens when certain payments are already integrated into regular wages.

I. Legal basis of the 13th month pay in the Philippines

The 13th month pay is primarily governed by Presidential Decree No. 851 and the implementing rules issued by the Department of Labor and Employment.

Under the implementing rules, the 13th month pay shall not be less than one-twelfth (1/12) of the basic salary earned by an employee within a calendar year.

This definition immediately matters because the law does not say one-twelfth of all earnings, gross pay, total compensation, or take-home pay. It says basic salary earned.

That is why legal analysis on overtime pay and holiday pay begins and ends with one question:

Are overtime pay and holiday pay part of “basic salary” for purposes of 13th month pay?

As a rule, they are not.

II. What is “basic salary” for 13th month pay purposes?

For 13th month pay, basic salary generally means the employee’s regular pay for services rendered during normal working days and hours, excluding payments that are not considered part of the basic wage.

The concept excludes many additional or premium payments because they are not part of the regular straight-time wage. These include:

Overtime pay
Holiday pay
Night shift differential
Premium pay for rest day or special day work
Cost-of-living allowances
Cash equivalent of unused leave credits, if treated separately
Bonuses and other non-integrated benefits
Commissions, unless by their nature they are treated as integral wage in some situations
Profit-sharing payments
Other allowances that are not built into the regular wage

The reason is simple: these items are usually paid only when specific conditions happen. Overtime pay arises only when the employee works beyond eight hours. Holiday pay arises because the law gives extra pay consequences on regular holidays. Premium pay arises because work was done on a rest day or special day. These are contingent, supplemental, or premium payments, not the employee’s basic monthly or daily wage.

III. The direct answer: are overtime pay and holiday pay included?

A. Overtime pay

Overtime pay is generally excluded from 13th month pay computation.

Overtime pay is compensation for work performed beyond eight hours a day. The Labor Code treats it as an additional premium over the regular wage. Because it is an extra payment for extra hours, it is not part of the employee’s basic salary for computing the 13th month pay.

Even if an employee habitually renders overtime, the usual rule remains the same: frequent overtime does not automatically convert overtime pay into basic salary.

B. Holiday pay

Holiday pay is also generally excluded from 13th month pay computation.

Holiday pay is a statutory benefit connected to regular holidays. It is distinct from the employee’s ordinary basic salary for normal workdays. Likewise, pay differentials or premium rates for work done on holidays are not part of the basic salary base for 13th month pay.

This remains true whether the employee:

was paid because the holiday was unworked but compensable, or
actually worked on the holiday and received premium holiday compensation.

Those payments are generally treated separately from basic salary.

IV. Why the rule is “basic salary only”

The rule exists because 13th month pay is not intended to mirror every peso an employee received during the year. It is a legally mandated year-end benefit tied only to basic salary.

That limitation serves several functions.

First, it creates a predictable and uniform statutory formula.

Second, it prevents variable premiums and contingent payments from distorting the mandated minimum.

Third, it distinguishes between:

regular wage for ordinary work, and
additional compensation for special circumstances

Overtime work, holiday work, night work, and work on rest days all involve premiums because they are not ordinary work under ordinary conditions. The law compensates them separately. But those separate payments do not usually become part of the 13th month pay base.

V. The standard formula

The minimum legal computation is:

13th Month Pay = Total Basic Salary Earned During the Calendar Year ÷ 12

The crucial phrase is total basic salary earned.

So if an employee’s payroll record for the year shows the following:

Basic salary: ₱240,000
Overtime pay: ₱30,000
Holiday pay: ₱12,000
Night shift differential: ₱8,000
Rice subsidy: ₱12,000

The 13th month pay is ordinarily based only on ₱240,000, not on the total earnings of ₱302,000.

Thus:

₱240,000 ÷ 12 = ₱20,000

Notably, the ₱30,000 overtime pay and ₱12,000 holiday pay are not added to the base unless there is a lawful and clearly established basis for treating them as part of basic salary.

VI. What exactly is excluded from the 13th month pay base?

In Philippine labor practice, the most common exclusions are the following.

1. Overtime pay

Excluded because it is compensation for hours worked beyond the normal workday.

2. Holiday pay

Excluded because it is a legal holiday benefit or premium, not basic salary.

3. Premium pay

Excluded because it compensates work performed under special conditions, such as on rest days or special non-working days.

4. Night shift differential

Excluded because it is an additional statutory premium for work performed during nighttime hours.

5. Allowances

Generally excluded if they are not integrated into the wage. This includes transportation allowance, meal allowance, cost-of-living allowance, and similar benefits, unless company policy or agreement clearly makes them part of basic salary.

6. Monetary benefits not treated as wage

Bonuses, gifts, productivity incentives, and profit-sharing payments are generally excluded unless the employer has expressly integrated them into the regular wage structure.

VII. The major source of confusion: “received regularly” does not always mean “basic salary”

Many employees assume that if a payment is received every payroll period, it must be included in the 13th month pay computation. That is not always correct.

A payment may be regularly received and still not form part of basic salary.

For example:

A worker may render overtime every week.
A call center employee may receive night shift differential every pay period.
A retail worker may frequently work on holidays or rest days.

Even if those amounts are consistently earned, they still remain premium or supplemental pay, not basic salary, unless some unusual wage arrangement legally converts them into part of the regular wage.

The controlling question is not frequency of payment alone. The controlling question is the legal character of the payment.

VIII. Can overtime pay or holiday pay ever be included?

As a practical matter, the general rule remains exclusion. But in legal analysis, one must distinguish between:

payments legally separate from basic salary, and
payments that the employer has actually integrated into the regular wage structure

If an employer, through contract, collective bargaining agreement, established company practice, or payroll structuring, treats certain amounts as part of the fixed regular wage rather than as separate premiums, a different conclusion may arise.

That said, this should be approached carefully. In most ordinary payroll systems:

overtime pay is separately computed,
holiday pay is separately computed, and
both remain excluded.

A. Integrated wage arrangements

There are wage arrangements in labor law where some benefits are effectively folded into the regular pay structure. But this is not presumed lightly. A court or labor tribunal will usually look at:

the employment contract,
the CBA, if any,
the payroll design,
salary slips,
company handbook provisions,
long and deliberate employer practice,
whether the amount is fixed and unconditional,
whether the parties intended integration into basic salary

If the amount is separately identified as overtime pay or holiday pay, that strongly supports exclusion from the 13th month pay base.

B. Better-than-the-law company policy

An employer is free to grant more than the statutory minimum. So a company may voluntarily adopt a policy that computes 13th month pay based on a broader compensation base, such as:

basic salary plus certain allowances,
basic salary plus guaranteed commissions,
or even total earnings including some premiums

That is legally possible as a matter of company generosity, policy, contract, or collective bargaining, provided it does not reduce the statutory minimum.

But this is not the legal minimum rule. It is a contractual or voluntary enhancement.

So the answer becomes:

As a matter of law: overtime pay and holiday pay are generally excluded.
As a matter of employer policy or agreement: they may be included if the employer clearly grants a more favorable formula.

IX. Distinguishing statutory minimum from company practice

This distinction is essential.

Statutory minimum

The law requires at least 1/12 of the basic salary earned.

Company-granted formula

Some employers compute a higher 13th month pay using a broader basis. Once properly granted, that benefit may become enforceable depending on how it was promised, implemented, and relied upon.

So if a company has, for several years, consistently included overtime pay and holiday pay in the 13th month pay computation, employees may argue that this has become:

a contractual commitment,
a company practice,
or a benefit protected against unilateral withdrawal under the principle against diminution of benefits

But that is no longer just a question of the minimum statute. It becomes a question of benefit practice, employer policy, and non-diminution.

X. The role of the non-diminution of benefits rule

Philippine labor law protects employees against the unilateral withdrawal or reduction of benefits that have ripened into company practice.

This means that even if the law itself does not require inclusion of overtime pay or holiday pay in the 13th month base, an employer may still be barred from removing such inclusion if:

it has been given over a long period,
the giving has been consistent and deliberate,
the benefit is not due to error,
and employees have come to rely on it

So an employer that historically computed the 13th month pay using:

basic salary + overtime pay + holiday pay

may face legal difficulty if it later reverts to the statutory minimum without legal basis and without regard to whether the broader formula had already become a protected benefit.

Again, this does not mean the statute requires inclusion. It means a more favorable company practice may become enforceable.

XI. Common scenarios

1. Monthly-paid office employee

An office employee receives a fixed monthly salary and, from time to time, earns overtime pay and holiday pay.

Rule: compute the 13th month pay based on the fixed basic salary only. Overtime pay and holiday pay are excluded.

2. Rank-and-file employee with heavy overtime throughout the year

The employee regularly works two to three overtime hours daily.

Rule: the overtime earnings are still generally excluded from the 13th month pay base. Regular occurrence does not by itself change the legal character of overtime pay.

3. Worker paid holiday premiums for actual holiday work

The employee works on several regular holidays and receives premium holiday compensation.

Rule: those holiday premiums are generally excluded from the 13th month pay base.

4. Employer has a handbook stating 13th month pay is based on “gross earnings”

In this case, the analysis changes.

If “gross earnings” is clearly defined and deliberately adopted by the employer, then the company may be contractually bound to use that broader basis, even though the statutory minimum only requires basic salary.

5. Employer historically included overtime and holiday pay for many years

Employees may have a non-diminution argument if the employer later removes that benefit.

The question then becomes evidentiary:

How long was the practice observed?
Was it consistent?
Was it deliberate?
Was it uniformly applied?
Was it due to error or misinterpretation?

XII. Sample computations

Example 1: Standard rule

Employee A earned during the year:

Basic salary: ₱300,000
Overtime pay: ₱24,000
Holiday pay: ₱10,000
Night shift differential: ₱6,000

Minimum 13th month pay:

₱300,000 ÷ 12 = ₱25,000

The overtime pay and holiday pay are excluded.

Example 2: Daily-paid employee

Employee B’s annual payroll shows:

Straight-time wages for normal working days: ₱210,000
Overtime pay: ₱18,000
Holiday pay: ₱9,000
Rest day premium: ₱7,000

Minimum 13th month pay:

₱210,000 ÷ 12 = ₱17,500

Only the straight-time basic wage forms part of the base.

Example 3: Employer grants more favorable policy

Employee C earned:

Basic salary: ₱240,000
Overtime pay: ₱36,000
Holiday pay: ₱12,000

Employer handbook provides that 13th month pay is based on “total taxable salary including overtime and holiday earnings.”

Then the company may compute:

(₱240,000 + ₱36,000 + ₱12,000) ÷ 12 = ₱24,000

This is valid as a more favorable employer grant, but not because the law requires it.

XIII. Interaction with commissions and other earnings

Questions about overtime and holiday pay often arise together with questions about commissions and allowances.

This area is trickier because some commissions, depending on their nature, may in certain cases be considered part of wage or part of basic salary analysis. But overtime pay and holiday pay are much less ambiguous. Their legal character as premium or additional compensation makes them generally excludable from the 13th month pay base.

So while disputes can arise over commissions, productivity incentives, and certain guaranteed allowances, the standard legal treatment of overtime pay and holiday pay is more settled:

they are ordinarily not included.

XIV. Rank-and-file coverage and relevance of exemptions

The 13th month pay requirement applies to rank-and-file employees, subject to the rules and exemptions recognized under the law and implementing issuances. In current Philippine labor practice, most private-sector rank-and-file employees are entitled to 13th month pay.

Whether a worker is entitled to 13th month pay at all is a different question from how to compute it.

Once the employee is covered, the formula still points back to basic salary earned. So even for clearly covered employees, overtime and holiday pay are usually left out of the computation.

XV. What payroll and HR should review

For compliance purposes, employers should review the following documents before finalizing 13th month pay computation:

employment contracts
payroll structure and earning codes
employee handbook
collective bargaining agreement
prior years’ computation methods
memoranda granting benefits beyond the law
internal definitions of “basic salary,” “gross pay,” and “taxable pay”

The reason is practical. Many payroll disputes happen not because the law is unclear, but because the employer’s own documents use inconsistent language.

For example, if payroll labels a recurring fixed amount as “allowance” but the contract treats it as part of salary, conflict may arise. The same is true if the handbook defines 13th month pay using a broader term than basic salary.

XVI. Evidence in labor disputes

If an employee claims that overtime pay and holiday pay should have been included, the case will usually turn on proof of one of the following:

a written company policy expressly requiring inclusion
a CBA provision granting a broader 13th month formula
payroll history showing long and consistent inclusion
admissions by the employer
contractual wording showing that these payments were integrated into the regular salary package

Without such proof, the default legal rule applies:

overtime pay and holiday pay are excluded from 13th month pay computation.

XVII. Misconceptions to avoid

Misconception 1: “Anything taxable must be included.”

Not true. Tax treatment and 13th month pay computation are not the same issue.

Misconception 2: “Anything received every month is basic salary.”

Not true. Regular receipt does not automatically transform premium pay into basic salary.

Misconception 3: “Holiday pay is part of salary because it is legally required.”

Not for this purpose. Many legally required labor benefits are still distinct from basic salary.

Misconception 4: “If overtime is mandatory, it becomes part of basic salary.”

Not by that fact alone. It remains overtime pay unless integrated into the wage structure by law, contract, or established practice.

Misconception 5: “Gross pay divided by 12 is always correct.”

Not under the minimum law. The correct statutory base is basic salary earned, not gross pay.

XVIII. Practical answer for employees

An employee checking whether the 13th month pay was properly computed should:

identify the total basic salary earned during the year;
exclude separately itemized overtime pay and holiday pay, unless a contract or policy says otherwise;
review salary slips, handbook provisions, and past payroll practice;
compare the actual amount received with 1/12 of total basic salary earned.

If the employer has historically used a more generous formula, the employee should preserve payroll records showing that practice.

XIX. Practical answer for employers

An employer seeking legal compliance should:

use basic salary earned as the statutory minimum base;
exclude overtime pay and holiday pay unless a more favorable rule applies;
ensure handbook and payroll terminology are consistent;
avoid casually using “gross salary” or “total earnings” in policy documents unless that is the intended formula;
review whether prior inclusion of overtime and holiday pay has already matured into enforceable company practice.

XX. Bottom line

Under Philippine law, overtime pay and holiday pay are generally not included in the computation of the 13th month pay, because the legally required basis is 1/12 of the employee’s basic salary earned within the calendar year, and those payments are ordinarily not part of basic salary.

They may be included only in special situations, such as when:

the employer has adopted a more favorable computation formula,
a contract or CBA expressly includes them, or
long, deliberate, and consistent company practice has made their inclusion enforceable.

So the controlling rule is this:

As a minimum legal standard in the Philippines, 13th month pay is based on basic salary, and overtime pay as well as holiday pay are ordinarily excluded.