How to compute your 13th month pay

The formula

Thirteenth month pay is the total basic salary you actually earned during the calendar year, divided by twelve. That is the whole rule. It is mandatory for rank-and-file employees in the private sector under Presidential Decree 851, it must be paid on or before 24 December, and it is not a bonus your employer can withhold for poor performance.

What counts as basic salary is narrower than what lands in your account. Excluded are overtime pay, holiday and night-shift premiums, allowances, commissions that are not part of your fixed wage, cost-of-living allowances, and cash conversion of unused leave — unless your company policy or collective agreement folds them in, which some do.

A full year

Earning ₱20,000 a month in basic salary and employed for the whole year:

• Total basic earned: ₱20,000 × 12 = ₱240,000
• 13th month pay: ₱240,000 ÷ 12 = ₱20,000

For an unbroken year at an unchanged salary, your 13th month pay equals one month’s basic. That is why people describe it as an extra month — but the formula, not the shorthand, is what governs the moment anything varies.

A partial year

This is where most disagreements start. If you joined in April and earned ₱20,000 a month basic through December, that is nine months:

• Total basic earned: ₱20,000 × 9 = ₱180,000
• 13th month pay: ₱180,000 ÷ 12 = ₱15,000

Note the divisor stays at twelve. It does not become nine. Dividing by the months you worked is the single most common error, and it inflates the figure by a third in this example.

The same applies if you resign. You are entitled to the proportion you earned, payable on separation, and length of service does not disqualify you.

If your salary changed during the year

Use what you actually earned, month by month, rather than your current rate. Six months at ₱18,000 followed by six at ₱22,000:

• (₱18,000 × 6) + (₱22,000 × 6) = ₱108,000 + ₱132,000 = ₱240,000
• 13th month pay: ₱240,000 ÷ 12 = ₱20,000

A mid-year raise pulls the figure up only in proportion to the months it applied to, which is why the number rarely matches one month of your final salary exactly.

Unpaid leave and absences

Because the formula is built on what you earned, unpaid days reduce it. If you were on leave without pay for a month, your total basic for the year falls by one month’s salary and your 13th month pay falls by a twelfth of that. Paid leave has no effect, because you earned your basic salary during it.

How much of it is taxed

Thirteenth month pay and other benefits are exempt from income tax up to ₱90,000 combined in a calendar year. Anything above that is added to your taxable income for the year and taxed at your marginal rate.

Two consequences worth planning for. If your 13th month pay is ₱20,000 and you received no other benefits, all of it is tax-free. If you also received a performance bonus of ₱85,000, the combined ₱105,000 exceeds the exemption by ₱15,000, and that ₱15,000 is taxable. The exemption is shared across all benefits, not granted separately to each.

Who is entitled

All rank-and-file private-sector employees who worked at least one month during the calendar year, regardless of how they are paid, how long they stayed, or whether they are still employed on the payment date. Managerial employees are excluded from the statutory entitlement, though many employers pay them anyway as a matter of policy.

Government employees receive a separate year-end bonus and cash gift under different rules rather than a 13th month under PD 851.

If it does not arrive

The deadline is 24 December. If it has not been paid by then, or the amount looks wrong, raise it in writing with your employer first and ask for the computation — you are entitled to see how the figure was reached. If that does not resolve it, the Department of Labor and Employment handles money claims of this kind through its regional offices, and a Single Entry Approach conference is the usual first step. Keep your payslips: the whole calculation rests on documented basic salary.