The Official Formula & What Counts as Basic Salary
Under Presidential Decree No. 851 and DOLE guidelines, 13th month pay is computed as:
The most common confusion is what qualifies as "basic salary." DOLE's definition is strict:
| ✅ Include in Basic Salary | ❌ Exclude from Calculation |
|---|---|
| ✔ Base hourly, daily, or monthly wage | ✘ Overtime (OT) pay |
| ✔ Night shift differential (if regular) | ✘ Holiday pay & premium pay |
| ✔ Paid vacation & sick leave (paid days) | ✘ Unused leave cash-out / conversion |
| ✔ COLA (if integrated into salary policy) | ✘ Rice, clothing & de minimis allowances |
| ✔ Maternity leave differentials | ✘ Christmas bonus (discretionary) |
| ✔ Salary differentials & adjustments | ✘ SSS, PhilHealth & Pag-IBIG employer share |