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SINGAPORE · FOR MANAGERS

Incomplete month salary calculator and MOM working days

When a monthly-rated employee joins after the 1st, leaves before the end of the month, takes no-pay leave or takes NS leave, MOM sets the formula: monthly gross rate of pay × (days actually worked ÷ days required to work that month). Working days leave out rest days and non-working days, but include public holidays. A day of 5 hours or less counts as half a day.

Salary for NovemberS$2,095.24
Less than a full month byS$1,904.76

S$4,000.00 ÷ 21 working days × 11 days worked. Days on paid leave, paid sick leave and public holidays count as days worked.

The MOM formula

  • Salary = monthly gross rate of pay ÷ total working days in that month × days the employee actually worked.
  • Gross rate of pay includes fixed allowances, but not overtime, bonuses, AWS, productivity incentives, or travel, food and housing allowances.
  • Working days exclude rest days and non-working days, but include public holidays.
  • Days worked include public holidays, paid annual leave and paid hospitalisation or sick leave.
  • A day on which the employee works 5 hours or less counts as half a day worked.
  • The same formula is used for no-pay leave and for NS leave.

4 worked examples

1. Joins mid-month

S$3,000 gross, Monday to Friday. Joins on Monday 16 November 2026. November 2026 has 21 working days, and 16 to 30 November has 11 of them. Salary: 3,000 × 11 ÷ 21 = S$1,571.43.

2. Leaves mid-month

S$4,000 gross, Monday to Friday. Last day is Friday 11 December 2026. December 2026 has 23 working days (Christmas Day counts), and 1 to 11 December has 9. Salary: 4,000 × 9 ÷ 23 = S$1,565.22.

3. No-pay leave

S$3,500 gross, Monday to Friday, 2 days of no-pay leave in February 2027 (20 working days). Salary: 3,500 × 18 ÷ 20 = S$3,150.00, a deduction of S$350.

4. A half day

S$3,000 gross, Monday to Friday, August 2026 (21 working days). One full day of no-pay leave, and another day where the employee works only 4 hours and takes the rest unpaid, which counts as half a day worked. Days worked: 21 - 1.5 = 19.5. Salary: 3,000 × 19.5 ÷ 21 = S$2,785.71.

MOM working days in 2026 and 2027

Days required to work each month for the two most common patterns. Public holidays that fall on a working day are included. If your team works another pattern, count the days from the roster and use the "Other" option in the calculator.

2026
MonthMonday to FridayMonday to Saturday
January2227
February2024
March2226
April2226
May2126
June2226
July2327
August2126
September2226
October2227
November2125
December2327
2027
MonthMonday to FridayMonday to Saturday
January2126
February2024
March2327
April2226
May2126
June2226
July2227
August2226
September2226
October2126
November2226
December2327

Common mistakes

  • Dividing by calendar days (30 or 31) instead of working days.
  • Dividing by 26 every month: the number of working days changes from month to month.
  • Leaving public holidays out of the working days.
  • Using basic pay instead of gross pay. Fixed allowances belong in the formula.

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Frequently asked questions

How do you calculate salary for an incomplete month in Singapore?

Monthly gross rate of pay × (days actually worked ÷ days the employee was required to work that month). For example, S$3,000 gross on a Monday to Friday week, joining on Monday 16 November 2026: 3,000 × 11 ÷ 21 = S$1,571.43.

When does the incomplete month formula apply?

When a monthly-rated employee joins after the first day of the month, leaves before the end of the month, takes no-pay leave, or takes leave for national service.

How many working days are in a month for MOM?

There is no fixed number. Count the days the employee is required to work under their own work pattern that month. Public holidays on a normal working day count; rest days and non-working days do not. On a Monday to Friday week, 2026 has between 20 and 23 working days a month.

Do public holidays count as working days?

Yes, if the public holiday falls on a day the employee would normally work. Rest days and non-working days (for example Saturday and Sunday on a 5-day week) do not count.

What if the employee works 5 hours or less on a day?

A day on which the employee works 5 hours or less counts as half a day worked.

Can I just divide the monthly salary by 26 or 30?

Not for an incomplete month. The MOM formula uses the actual working days in that month for that employee, which change from month to month.

Is it gross pay or basic pay?

Gross rate of pay: basic salary plus fixed allowances. Overtime, bonuses, AWS and reimbursements are left out.

General information for managers, checked in November 2026. It is not legal advice, and contracts or company policies may give more. Always check the official source: MOM: monthly and daily salary.

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