How Bonuses Are Treated in Singapore
In Singapore, your annual wage supplement (13th month) or performance bonus is subject to two things: CPF (if you're a Citizen or PR, up to a ceiling) and income tax (added to your total annual income). Unlike some countries, there's no separate "bonus tax rate" — your bonus is simply taxed at your marginal rate, the rate that applies to the top slice of your income.
🏦 CPF on Bonuses: The Additional Wage (AW) Ceiling
Bonuses, commissions, and other irregular payments are classed as Additional Wages (AW) for CPF purposes — separate from your regular monthly salary (Ordinary Wages, or OW). CPF on Additional Wages is capped by the AW Ceiling:
AW Ceiling = $102,000 − Total Ordinary Wages already subject to CPF this year
For example, if your monthly salary is $6,000 (well under the $8,000 OW ceiling), your OW subject to CPF for the year is $6,000 × 12 = $72,000. Your AW Ceiling is then $102,000 − $72,000 = $30,000 — meaning bonuses up to $30,000 in that calendar year still attract CPF. If your base salary is high enough that OW alone reaches $102,000, your AW Ceiling is $0, and your entire bonus is CPF-free.
🏛️ Tax on Bonuses: Marginal Rate, Not a Special Rate
Your bonus is added to your annual income and taxed using Singapore's normal progressive brackets. Because tax is progressive, the bonus is effectively taxed at your marginal rate — the rate for the highest bracket your total income (base + bonus) reaches. If your bonus pushes some income into a new, higher bracket, only that portion is taxed at the higher rate; the rest of your income keeps being taxed at the lower rates it already fell into.
💡 Example Calculation
Scenario: Singapore Citizen, age 35, $72,000 base salary, $6,000 bonus.
1. OW subject to CPF: $72,000 (monthly salary $6,000, under the $8,000 OW ceiling)
2. AW Ceiling: $102,000 − $72,000 = $30,000 — the full $6,000 bonus fits within this
3. CPF on bonus (employee, 20%): $6,000 × 20% = $1,200
4. Tax on base salary alone: chargeable income $72,000 − $14,400 CPF − $1,000 relief = $56,600 → tax = $1,712
5. Tax on base + bonus: chargeable income $78,000 − $15,600 CPF − $1,000 relief = $61,400 → tax = $2,048
6. Additional tax due to bonus: $2,048 − $1,712 = $336
7. Net bonus: $6,000 − $1,200 (CPF) − $336 (tax) = $4,464
Note: This is a simplified example. Actual figures depend on your specific reliefs and exact monthly OW pattern.
⚠️ Important Notes
- This calculator provides estimates only, based on 2026 CPF rates and YA 2026 IRAS resident tax rates.
- It assumes your base salary is spread evenly across 12 months when calculating OW subject to CPF — actual timing of past bonuses this year can affect your true remaining AW Ceiling.
- The "additional tax due to bonus" is the marginal impact — the difference between tax with and without the bonus — not a separately withheld amount, since Singapore doesn't withhold tax from bonus payments directly.
- It doesn't model every specific personal relief individually.
- For exact figures, use the official IRAS Income Tax Calculator or the CPF Board.