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Methodology

Singapore Overtime Pay Calculator methodology

Calculate Singapore Employment Act Part 4 overtime for confirmed covered workers. Scope: Singapore Employment Act Part 4, rules checked 27 July 2026. Official Ministry of Manpower employment-pay sources captured and reviewed 27 July 2026.
Duc Nguyen X.By Duc Nguyen X.· Founder, Wage101Last reviewed: View update historyMethodology

Educational only: Work and pay decision support, not tax, legal, financial or career advice.

Privacy: Calculations run locally; Wage101 does not receive your work or pay inputs.

Update policy: Reviewed when formulas or official dependencies change.

Scope: Singapore work and pay planning using your own assumptions.

1. Formulas and units

Part 4 overtime pay
overtimePay = round to cents(hourlyBasicRate × 1.5 × overtimeHoursInSalaryPeriod)

Where

overtimeHoursInSalaryPeriod
Overtime hours this salary period (hours)Source: User assumption
overtimePay
Part 4 overtime pay (SGD/salary period)Source: Calculated output
Hourly basic rate
hourlyBasicRate = 12 × calculationMonthlyBasicRate ÷ (52 × 44)

Where

hourlyBasicRate
Hourly basic rate (SGD/hour)Source: Calculated output
Monthly basic rate used
calculationMonthlyBasicRate = workman monthlyBasicRate; non-workman min(monthlyBasicRate, 2600)

Where

monthlyBasicRate
Monthly basic rate (SGD/month)Source: User assumption
calculationMonthlyBasicRate
Monthly basic rate used (SGD/month)Source: Calculated output
Monthly overtime after this period
overtimeHoursAfterSalaryPeriod = overtimeHoursAlreadyWorkedInMonth + overtimeHoursInSalaryPeriod

Where

overtimeHoursInSalaryPeriod
Overtime hours this salary period (hours)Source: User assumption
overtimeHoursAlreadyWorkedInMonth
Prior overtime hours this month (hours)Source: User assumption
overtimeHoursAfterSalaryPeriod
Monthly overtime after this period (hours)Source: Calculated output

Money inputs and outputs use SGD. Pay, time, benefits and work-related costs use the units stated beside each input.

2. Worked example

Input assumptions

A covered workman on S$3,000 basic monthly pay works 10 overtime hours.

Calculation and outputs

Example

A covered workman on S$3,000 basic monthly pay works 10 overtime hours.

Part 4 overtime pay
236.01 currency units
Hourly basic rate
15.73 currency units
Monthly basic rate used
3,000.00 currency units
Monthly overtime after this period
10

The statutory hourly basis, multiplier and monthly-hour total remain visible.

Interpretation

Use the result only after overtime eligibility and hours are confirmed.

3. Validation and boundary checks

  • The worked example uses the same shared-work-logic engine as the interactive planner.
  • Unsupported eligibility, policy branches and out-of-range assumptions fail closed.
  • Result cards, trace, CSV, PDF and methodology bind to named engine result fields.

4. Assumptions and source classification

  • Non-manager/non-executive status and Part 4 coverage are confirmed.
  • The monthly basic rate and overtime record are accurate.

Official dependencies used by this calculator are captured in the Wage101 evidence register and version-acknowledged in this page history. User-entered work and pay assumptions remain separate from those official inputs.

5. Limitations

  • Eligibility and employment classification are not decided by the tool.
  • Only the full-time monthly-rated 44-hour statutory divisor is supported; part-time formulas are excluded.
  • Hours above 72 in a month fail closed without a confirmed official exemption.

This is educational decision support, not personalised tax, legal, financial or career advice. Check how the rules that apply in Singapore treat your work and pay circumstances, and seek qualified advice where appropriate.

6. Update and evidence policy

Registered family-level suites test formula invariants and example reconciliation; the release ledger records that coverage without claiming a separate oracle for every line of public copy. Registered official sources block dependent public workflows when their evidence or version acknowledgement is unavailable or invalid. Work and pay inputs remain user-supplied because they vary by person, job and contract.

Change history

  1. : Initial public release of the Singapore Overtime Pay planner and methodology.

Related reading

Use these practical guides to interpret the decision and its assumptions.

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