13th month pay, computed properly.

How 13th month pay is computed

Under Presidential Decree 851, every rank-and-file employee in the private sector who worked at least one month in the calendar year is entitled to 13th month pay. The formula is short:

13th month pay = total basic salary earned during the calendar year ÷ 12

You always divide by 12. This is the single most common mistake. If someone worked six months, you do not divide their earnings by six — you divide by 12, and the pro-rating happens automatically. Dividing by the months worked would hand a half-year employee a full month's salary.

Worked examples

What counts as "basic salary"

Only basic pay enters the computation. These are excluded:

• Overtime pay
• Holiday pay and premium pay
• Night shift differential
• Cost-of-living allowance (COLA) and other allowances
• Cash conversion of unused leave credits
• Profit-sharing, commissions not integrated into basic pay, and other monetary benefits

Unpaid absences are different: they don't get "excluded" so much as they never became earnings in the first place. Days without pay lower the basic salary actually earned, so they lower the 13th month pay proportionally.

Who is entitled

• All rank-and-file employees in the private sector — regardless of position title, employment status (probationary, regular, contractual), or how they're paid (monthly, daily, piece-rate).
• Minimum service: at least one month worked during the calendar year.
• Resigned or separated employees are entitled to a pro-rated amount, usually released with final pay.
• Managerial employees are not covered by PD 851. Many employers grant it anyway — and where that has been consistent and deliberate over years, it can become a demandable benefit that cannot simply be withdrawn.

The deadline

13th month pay must be paid on or before December 24 each year. An employer may split it — half around mid-year, the balance in December — but the full amount must be settled by the 24th.

Tax treatment

Under the TRAIN Law, 13th month pay and other benefits are excluded from taxable income up to a combined ₱90,000. Only the portion above ₱90,000 is added to taxable compensation and subjected to withholding tax.

The ₱90,000 ceiling is shared. If you also received a Christmas bonus, a performance bonus, or excess de minimis benefits, those count toward the same ₱90,000 before the 13th month pay does. That's what the "other bonuses" field above is for.

De minimis benefits within their own prescribed limits are separately exempt; only the excess spills into this ₱90,000 bucket.

Common mistakes

1. Dividing by months worked instead of by 12 — overpays every partial-year employee.
2. Including allowances or overtime in basic salary — inflates the amount and creates an inconsistent basis across staff.
3. Forgetting resigned employees — they are still entitled to the pro-rated amount.
4. Assuming the whole thing is tax-free — it is, up to ₱90,000 combined with other benefits, not beyond.
5. Treating it as a bonus — it is a legal obligation, not a discretionary gift, and cannot be waived by agreement.

Related tools

The payslip generator handles monthly payroll with SSS, PhilHealth, Pag-IBIG and withholding tax computed for you. Freelancers rather than employees should look at the 8% vs graduated tax calculator instead — 13th month pay is an employee benefit and does not apply to self-employed income.

This is a computation aid, not legal or payroll advice. Rules on coverage, inclusions and tax treatment carry nuance that a calculator cannot capture — verify against the latest DOLE and BIR issuances, or with your accountant, before releasing payroll.