Confirm Part 4 coverage before doing the arithmetic
The reviewed branch supports a workman doing manual labour with monthly basic salary of S$4,500 or less, or a covered non-workman with monthly basic salary of S$2,600 or less. Basic salary is not the same as gross salary: MOM excludes items such as overtime, bonuses, annual wage supplement and allowances from this threshold definition.
Part 4 does not cover managers or executives. Wage101 asks the user to confirm both the supported category and non-manager or non-executive status rather than trying to classify the job.
| Confirmed category | Monthly basic-salary threshold | Calculator treatment |
|---|---|---|
| Workman | S$4,500 or less | Uses the confirmed monthly basic rate when converting to the hourly basic rate. |
| Covered non-workman | S$2,600 or less | Fails closed above the supported threshold rather than assuming Part 4 coverage. |
| Manager, executive or unconfirmed status | Not a supported branch | No statutory result is shown; employment classification requires separate review. |
Keep the supported pay basis and hour record explicit
- Confirm the worker is covered by Part 4 and is not a manager or executive.
- Choose workman or non-workman and enter monthly basic salary, not total gross monthly pay.
- Enter overtime hours for the salary period and overtime already worked earlier in the month.
- Confirm an over-72-hour exemption only when an official exemption actually applies.
- Use this branch only for the supported full-time monthly-rated 44-hour divisor.
Convert monthly basic salary before applying the multiplier
Hourly basic rate = 12 × monthly basic rate ÷ (52 × 44). Part 4 overtime pay = hourly basic rate × 1.5 × overtime hours in the salary period.
The calculator carries the unrounded hourly result into the multiplication and rounds the final overtime pay to cents. Rounding the hourly rate to S$15.73 first would not reproduce the exact S$236.01 fixture.
Worked example: S$3,000 monthly basic pay and 10 overtime hours
| Step | calculator value | Why it is shown |
|---|---|---|
| Confirmed branch | Covered workman; non-manager/non-executive | The S$3,000 monthly basic rate is within the supported workman threshold. |
| Hourly basic rate | 12 × S$3,000 ÷ (52 × 44) = S$15.7342657343 | The unrounded intermediate is retained for the final calculation. |
| Overtime hourly basis | S$15.7342657343 × 1.5 | The reviewed minimum multiplier applies only after coverage is confirmed. |
| Part 4 overtime pay | S$236.01 for 10 hours | This is the final salary-period result after rounding to cents. |
| Monthly overtime total | 0 prior + 10 current = 10 hours | The cumulative total remains below the 72-hour limit in this fixture. |
Track the 72-hour monthly limit separately
The calculator adds current-period overtime to overtime already worked in the month. If the total exceeds 72 hours and no official exemption has been confirmed, it fails closed instead of producing a normal statutory estimate.
An exemption confirmation is an input, not a legal decision made by Wage101. Work on rest days or public holidays can involve separate rules and is not automatically represented by this overtime-only result.
What the Part 4 overtime estimate does not decide
- No employee-category, manager/executive, Part 4 coverage or exemption adjudication.
- No part-time, hourly-rated or daily-rated formula.
- No rest-day pay, public-holiday pay, time off in lieu or shift premium.
- No CPF, income tax or take-home-pay calculation.
- No assumption that citizenship or SPR status determines this overtime branch.
How the Singapore Overtime Pay Calculator calculation works
overtimePay = round to cents(hourlyBasicRate × 1.5 × overtimeHoursInSalaryPeriod)
- overtimePay
- Part 4 overtime pay
- employeeCategory
- Part 4 employee category
- coverageConfirmation
- Part 4 and non-manager coverage
- monthlyBasicRate
- Monthly basic rate
- overtimeHoursInSalaryPeriod
- Overtime hours this salary period
- overtimeHoursAlreadyWorkedInMonth
- Prior overtime hours this month
- officialExemptionConfirmed
- Over-72-hour exemption
The calculator and article use this relationship consistently; the article does not reimplement the calculation.
hourlyBasicRate = 12 × calculationMonthlyBasicRate ÷ (52 × 44)
- hourlyBasicRate
- Hourly basic rate
- employeeCategory
- Part 4 employee category
- coverageConfirmation
- Part 4 and non-manager coverage
- monthlyBasicRate
- Monthly basic rate
- overtimeHoursInSalaryPeriod
- Overtime hours this salary period
- overtimeHoursAlreadyWorkedInMonth
- Prior overtime hours this month
- officialExemptionConfirmed
- Over-72-hour exemption
The calculator and article use this relationship consistently; the article does not reimplement the calculation.
calculationMonthlyBasicRate = workman monthlyBasicRate; non-workman min(monthlyBasicRate, 2600)
- calculationMonthlyBasicRate
- Monthly basic rate used
- employeeCategory
- Part 4 employee category
- coverageConfirmation
- Part 4 and non-manager coverage
- monthlyBasicRate
- Monthly basic rate
- overtimeHoursInSalaryPeriod
- Overtime hours this salary period
- overtimeHoursAlreadyWorkedInMonth
- Prior overtime hours this month
- officialExemptionConfirmed
- Over-72-hour exemption
The calculator and article use this relationship consistently; the article does not reimplement the calculation.
overtimeHoursAfterSalaryPeriod = overtimeHoursAlreadyWorkedInMonth + overtimeHoursInSalaryPeriod
- overtimeHoursAfterSalaryPeriod
- Monthly overtime after this period
- employeeCategory
- Part 4 employee category
- coverageConfirmation
- Part 4 and non-manager coverage
- monthlyBasicRate
- Monthly basic rate
- overtimeHoursInSalaryPeriod
- Overtime hours this salary period
- overtimeHoursAlreadyWorkedInMonth
- Prior overtime hours this month
- officialExemptionConfirmed
- Over-72-hour exemption
The calculator and article use this relationship consistently; the article does not reimplement the calculation.
A covered workman on S$3,000 basic monthly pay works 10 overtime hours.
Inputs used in the Singapore Overtime Pay Calculator worked example
| Input | Entered value | What it represents | Source class |
|---|---|---|---|
| Part 4 employee category | Workman | Choose the confirmed covered category. | user record |
| Part 4 and non-manager coverage | Confirmed supported | Confirm both Part 4 coverage and that the worker is not a manager or executive. | user record |
| Monthly basic rate | 3,000 SGD/month | Confirmed monthly basic rate; switching category applies its reviewed Part 4 ceiling. | user assumption |
| Overtime hours this salary period | 10 hours | Overtime hours being calculated. | user assumption |
| Prior overtime hours this month | 0 hours | Overtime already worked earlier in the month. | user assumption |
| Over-72-hour exemption | No confirmed exemption | Confirm only when an official exemption applies. | user record |
Choose the right Singapore Overtime Pay Calculator basis or mode
| Choice | How to use it |
|---|---|
| Not confirmed | Choose the confirmed covered category. |
| Workman | Choose the confirmed covered category. |
| Non-workman | Choose the confirmed covered category. |
| Choice | How to use it |
|---|---|
| Not confirmed | Confirm both Part 4 coverage and that the worker is not a manager or executive. |
| Confirmed supported | Confirm both Part 4 coverage and that the worker is not a manager or executive. |
| Unsupported or review required | Confirm both Part 4 coverage and that the worker is not a manager or executive. |
| Choice | How to use it |
|---|---|
| No confirmed exemption | Confirm only when an official exemption applies. |
| Official exemption confirmed | Confirm only when an official exemption applies. |
Worked example: Singapore Overtime Pay Calculator
The calculator normalizes the inputs above, applies Part 4 overtime pay, and returns the outputs below. The displayed result is therefore reproducible in the linked calculator.
| Measure | Result | Interpretation |
|---|---|---|
| Part 4 overtime pay | 236.01 SGD/salary period | Hourly basic rate multiplied by 1.5 and overtime hours. |
| Hourly basic rate | 15.73 SGD/hour | Monthly basic rate converted with the statutory 44-hour divisor. |
| Monthly basic rate used | 3,000 SGD/month | Confirmed basic rate after the applicable calculation cap. |
| Monthly overtime after this period | 10 hours | Prior monthly overtime plus this salary period. |
Interpret the result and test Overtime hours this salary period
- Part 4 overtime pay: 236.01 SGD/salary period. Hourly basic rate multiplied by 1.5 and overtime hours.
- Hourly basic rate: 15.73 SGD/hour. Monthly basic rate converted with the statutory 44-hour divisor.
- Monthly basic rate used: 3,000 SGD/month. Confirmed basic rate after the applicable calculation cap.
- Monthly overtime after this period: 10 hours. Prior monthly overtime plus this salary period.
| Result | Baseline | Changed-input scenario | How to read it |
|---|---|---|---|
| Part 4 overtime pay | 236.01 SGD/salary period | 259.62 SGD/salary period | Hourly basic rate multiplied by 1.5 and overtime hours. |
| Hourly basic rate | 15.73 SGD/hour | 15.73 SGD/hour | Monthly basic rate converted with the statutory 44-hour divisor. |
| Monthly basic rate used | 3,000 SGD/month | 3,000 SGD/month | Confirmed basic rate after the applicable calculation cap. |
| Monthly overtime after this period | 10 hours | 11 hours | Prior monthly overtime plus this salary period. |
Checks that are specific to Singapore Overtime Pay Calculator
- 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.
What this Singapore Overtime Pay Calculator guide includes and excludes
- Non-manager/non-executive status and Part 4 coverage are confirmed.
- The monthly basic rate and overtime record are accurate.
Sources and method boundary
- www.mom.gov.sg guidance used for the reviewed local boundary — www.mom.gov.sg (accessed 2026-07-28): Reviewed 2026-07-28 against current MOM Part 4 coverage and overtime guidance; eligibility, exceptions and non-Part-4 arrangements remain outside the calculator.
- www.mom.gov.sg guidance used for the reviewed local boundary — www.mom.gov.sg (accessed 2026-07-28): Reviewed 2026-07-28 against current MOM Part 4 coverage and overtime guidance; eligibility, exceptions and non-Part-4 arrangements remain outside the calculator.
- www.mom.gov.sg guidance used for the reviewed local boundary — www.mom.gov.sg (accessed 2026-07-28): Reviewed 2026-07-28 against current MOM Part 4 coverage and overtime guidance; eligibility, exceptions and non-Part-4 arrangements remain outside the calculator.
- Singapore Overtime Pay Calculator methodology — Wage101 (accessed 2026-07-28): Canonical formulas, units, validation, calculator behavior and limitations.