How to Set Up Unpaid Leave Approval and Payroll Handoffs in Singapore

Introduction

Unpaid leave needs careful coordination between HR, managers, and payroll teams. When an employee takes approved unpaid leave, the organisation must ensure that the absence is recorded correctly, the approval is documented, and any applicable salary adjustment is calculated accurately.

In Singapore, unpaid leave may arise when an employee has exhausted their paid annual leave, requests additional time off for personal reasons, or takes an absence that is not covered by a statutory paid leave scheme. Employers must distinguish these situations from statutory leave entitlements and avoid treating an absence as unpaid when the employee is legally entitled to paid leave.

A well-designed process connects employee applications, manager approvals, HR verification, attendance records, and payroll processing. This article explains how Singapore businesses can establish an unpaid leave workflow, calculate salary adjustments, and maintain reliable records.

1. Define When Employees Can Apply for Unpaid Leave

Employers should establish clear circumstances in which employees may request unpaid leave. Common situations include:

• An employee has used their available annual leave.
• An employee needs additional time off for personal or family matters.
• An employee requests an extended break.
• An employee needs time away for reasons not covered by a statutory paid leave scheme.
• An employee requests unpaid leave under an arrangement agreed with the employer.

MOM confirms that employees may apply for unpaid leave if they are not eligible for paid annual leave or have used up their paid annual leave. Such leave is subject to the employer's approval.

However, unpaid leave should not be used as a substitute for statutory entitlements. Before approving an unpaid absence, HR should check whether the employee qualifies for annual leave, sick leave, childcare leave, parental leave, public holiday benefits, or another applicable entitlement.

2. Create a Written Unpaid Leave Policy

A written policy helps employees understand the approval process and helps managers make consistent decisions.

The policy should explain:

• Who can apply for unpaid leave.
• Whether employees must exhaust annual leave first.
• How far in advance employees should submit requests.
• Minimum and maximum request durations, where the company sets such limits.
• Who approves the request?
• What supporting information is required.
• How urgent or emergency requests are handled.
• How approved unpaid leave affects salary.
• How unpaid leave is recorded in attendance and payroll systems.
• How employees can question an incorrect deduction.

The policy should also clarify that approval depends on operational requirements and applicable employment obligations. Employers should avoid promising automatic approval or applying restrictions that conflict with statutory rights.

3. Configure an Employee Unpaid Leave Application Process

Employees should have a straightforward way to submit unpaid leave requests. This may be through an HR management system, employee self-service portal, mobile application, or standard company form.

A complete request should capture:

Information	Purpose
Employee name and ID	Identifies the employee
Department and manager	Routes the request
Leave start and end dates	Defines the absence period
Number of working days or hours	Supports attendance and payroll calculations
Reason for leave	Provides context for the approval decision
Leave category	Distinguishes unpaid leave from other absence types
Supporting documents	Captures relevant evidence where genuinely required
Employee acknowledgement	Confirms the request details

The system should calculate the scheduled working days or hours affected by the request. Weekends, rest days, public holidays, and non-working days should not automatically be treated as unpaid working days.

For example, an employee who requests a week away may have only five scheduled working days during that period. HR should use the employee's actual work schedule when recording the absence.

4. Establish a Clear Manager Approval Workflow

Managers should review unpaid leave requests before HR or payroll processes the transaction.

A typical workflow can include the following stages:

1. Employee submission: The employee submits the request with the relevant dates and information.
2. Manager review: The manager checks staffing levels, workload, deadlines, and operational coverage.
3. Manager decision: The manager approves, rejects, or requests clarification.
4. HR verification: HR checks the leave category, employee eligibility, policy conditions, and relevant employment terms.
5. System update: The approved unpaid leave is recorded in the employee's leave and attendance records.
6. Payroll notification: The approved transaction is included in the relevant payroll handoff.
7. Employee notification: The employee receives confirmation of the decision and, where appropriate, an explanation of the salary impact.

The approval process should distinguish between a manager's operational decision and HR's responsibility to verify the correct employment and payroll treatment.

5. Set Approval Rules Based on Leave Duration

Different unpaid leave requests may require different approval levels.

For example, a business may allow line managers to approve short requests while requiring HR or senior management review for longer absences.

An illustrative approval structure is:

Request type	Suggested approval route
Short unpaid leave	Line manager
Multiple consecutive working days	Line manager and HR
Extended unpaid leave	Department head and HR
Leave affecting critical operations	Department head and relevant business leader
Exceptional circumstances	HR and authorised senior management

These are internal workflow examples, not statutory approval levels. Each organisation should establish approval authority based on its size, operations, and internal controls.

The policy should also identify who can approve requests when the employee's usual manager is unavailable.

6. Verify the Leave Category Before Approving Unpaid Leave

One of the most important HR checks is confirming that the requested absence is genuinely unpaid.

An employee may have exhausted annual leave but still qualify for another statutory leave entitlement. For example, eligible employees may have paid sick leave or childcare leave available under Singapore's employment framework.

Before assigning an unpaid leave code, HR should review:

• Whether the employee has remaining annual leave.
• Whether the employee qualifies for paid sick leave.
• Whether childcare or parental leave applies.
• Whether a public holiday falls within the requested period.
• Whether the employee is entitled to another form of paid absence.
• Whether the employment contract provides additional paid leave.

If the employee is entitled to a statutory paid leave benefit, the absence should be classified and processed according to the applicable scheme rather than automatically converted into unpaid leave.

This verification helps prevent incorrect salary deductions and employee disputes.

7. Define How Unpaid Leave Is Recorded in the HR System

Once approved, unpaid leave should be recorded using a separate leave category. It should not be mixed with annual leave or other paid absence records.

The system should capture:

• Employee details.
• Approved absence dates.
• Scheduled working days or hours affected.
• Number of unpaid leave days or hours.
• Approval status.
• Approving manager.
• HR verification status.
• Payroll period affected.
• Payroll handoff status.
• Any subsequent correction or cancellation.

If an employee takes only part of a scheduled shift as unpaid leave, the system should record the relevant hours rather than automatically treating the entire day as unpaid.

HR should also ensure that cancelled or amended requests update the attendance and payroll records. Otherwise, an employee may receive an incorrect deduction even after the original request has been withdrawn.

8. Calculate Salary Adjustments Correctly

Salary calculations are a critical part of the unpaid leave process.

For a monthly-rated employee covered by the Employment Act, taking one or more days of unpaid leave during the month means the employee has worked an incomplete month. Section 20A of the Employment Act provides the formula for calculating salary for an incomplete month.

Salary for an incomplete month = Monthly gross rate of pay ÷ Total number of working days required in the month × Number of days actually worked

The total working days required in the month excludes rest days and non-working days but includes public holidays. Days of eligible paid annual leave and paid sick or hospitalisation leave are included when determining the days actually worked for this calculation. Unpaid leave days are not treated as days actually worked.

Example of an unpaid leave salary calculation

Assume an employee has:

• Monthly gross rate of pay: SGD 3,300.
• Required working days in the month: 22.
• Unpaid leave taken: 2 working days.
• Other working days and qualifying paid days: 20.

The calculation is:

Item	Calculation	Amount
Daily rate for incomplete-month calculation	SGD 3,300 ÷ 22	SGD 150
Days counted as actually worked	22 − 2	20 days
Salary payable	SGD 150 × 20	SGD 3,000
Salary reduction	SGD 3,300 − SGD 3,000	SGD 300

9. Handle Part-Time and Variable Work Schedules Carefully

Not every employee has a standard five-day working week. Some employees work part-time, on rotating shifts, or on schedules that vary by week.

HR and payroll teams should therefore verify:

• Contractual working hours.
• Scheduled workdays.
• Normal shift duration.
• Whether the employee is paid monthly, daily, or hourly.
• Number of unpaid hours or working days.
• Applicable salary calculation method.

For example, if a part-time employee is scheduled to work four hours on a particular day and takes the entire shift as unpaid leave, the system should record four unpaid hours. It should not automatically record an eight-hour absence.

Where the employee's schedule changes, payroll should use the applicable contractual and statutory calculation method rather than relying on a standard full-time formula.

10. Create a Formal HR-to-Payroll Handoff

The payroll handoff should be a controlled process, not an informal email or verbal notification.

Once unpaid leave is approved and verified, HR should send a structured transaction to payroll.

The handoff should include:

Handoff field	Information payroll needs
Employee ID	Unique employee reference
Payroll period	Month or salary period affected
Leave category	Approved unpaid leave
Start and end dates	Exact absence dates
Unpaid working days or hours	Amount of absence to process
Employee work schedule	Required working days or hours
Approval status	Confirmation that the request is authorised
Approver	Manager or authorised approver
HR verification	Confirmation of category and records
Salary treatment	Relevant calculation or payroll instruction
Adjustment reference	Unique transaction or audit reference

Payroll should not process an unverified request simply because it appears in an employee's attendance record.

The handoff should have a clear status, such as approved by the manager, verified by HR, sent to payroll, processed, or returned for correction.

11. Set a Payroll Cut-Off and Exception Process

Every organisation should establish a cut-off date for leave transactions that affect the current payroll.

A practical monthly process could look like this:

Stage	Activity
Before payroll cut-off	Employees submit unpaid leave requests
Manager review	Managers approve or reject outstanding requests
HR verification	HR checks dates, category, schedule, and approval
Payroll handoff	Verified transactions are sent to payroll
Payroll validation	Payroll checks salary impact and duplicate entries
Payroll approval	Authorised personnel approve the final payroll
After payroll	Late corrections are documented and processed appropriately

Requests received after the cut-off should follow a documented exception process.

For example, if an employee reports an emergency absence after payroll data has been transferred, HR should record the absence promptly and notify payroll. If the salary calculation has already been finalised, the correction should be handled through an authorised adjustment in the appropriate pay period, in accordance with applicable requirements.

The business should avoid making undocumented changes to a completed payroll run.

12. Reconcile Unpaid Leave With Attendance Records

Approved unpaid leave should match the employee's actual attendance record.

Before payroll is closed, HR should compare the leave system with attendance data to identify discrepancies such as:

• Approved unpaid leave recorded as normal attendance.
• Unpaid leave deducted when the employee was present.
• Unpaid leave recorded for a rest day.
• Incorrect shift dates.
• Duplicate absence entries.
• Cancelled leave still included in payroll.
• Partial-day leave incorrectly recorded as a full day.

For example, an employee may work for three hours before leaving for an approved unpaid absence during the remainder of the shift. The system should record the actual hours worked and the unpaid hours separately.

HR should investigate discrepancies before confirming the final payroll handoff.

13. Review Salary Deductions and Itemised Payslips

Salary deductions must be supported by a valid reason and calculated correctly.

MOM permits salary deductions for absence from work, with different calculation treatment for authorised and unauthorised absence. Approved unpaid leave should be processed as an authorised absence and reflected through the applicable incomplete-month salary calculation for monthly-rated employees covered by the relevant rules.

Payroll teams should check that:

• The unpaid leave was approved or otherwise correctly classified.
• The absence dates match the HR record.
• The correct salary calculation has been used.
• The deduction has not been applied twice.
• Any cancellation or correction has been reflected.
• The resulting salary is consistent with the employee's entitlement and employment terms.

Employers covered by the Employment Act must issue itemised payslips and maintain the required employment and salary records. Payslips should clearly explain the salary components and relevant deductions so employees can understand the effect of unpaid leave.

14. Maintain Records and an Audit Trail

A complete record of unpaid leave helps HR explain decisions and payroll adjustments.

Employers should retain relevant information, including:

• Employee request.
• Leave dates and duration.
• Manager approval or rejection.
• HR verification.
• Supporting information where necessary.
• Attendance record.
• Payroll handoff reference.
• Salary calculation.
• Final payroll adjustment.
• Any correction or reversal.

Each change should show who made it, when it was made, and why.

Access should be limited to authorised personnel. Employers should also handle employee personal data in accordance with applicable obligations under Singapore's Personal Data Protection Act (PDPA). Supporting documents should not be collected or shared more widely than necessary.

15. Use HR and Payroll Software to Automate the Process

A connected HR and payroll system can reduce manual work and prevent unpaid leave transactions from being missed or processed incorrectly.

Useful features include:

Software feature	How it supports the process
Employee self-service	Allows employees to submit unpaid leave requests
Configurable approval workflows	Routes requests to the correct manager
Separate leave categories	Distinguishes unpaid leave from paid leave
Work schedule integration	Identifies the actual working days or hours affected
HR verification controls	Prevents unverified requests from moving forward
Payroll handoff status	Tracks whether transactions have been sent and processed
Salary calculation rules	Supports the applicable incomplete-month calculation
Attendance integration	Identifies mismatches between leave and attendance
Exception reports	Highlights late, duplicate, or incomplete transactions
Audit trails	Records approvals and changes
Payslip integration	Helps explain salary adjustments to employees

Before implementing a system, employers should test scenarios such as a one-day unpaid absence, multiple consecutive days, partial-shift unpaid leave, cancelled leave, a request submitted after cut-off, and a part-time employee with variable hours.

Software should be configured to reflect the employee's actual employment terms and current statutory requirements. Automation supports compliance but does not replace HR and payroll review.

16. Common Mistakes to Avoid

• Treating every absence as unpaid leave: HR should first check whether the employee qualifies for statutory or contractual paid leave.
• Approving leave without recording it: Verbal approval can create disputes when attendance and payroll records do not match.
• Using the wrong salary divisor: Monthly-rated employees covered by the relevant rules should have incomplete-month salary calculated using the statutory formula, not an arbitrary divisor.
• Ignoring work schedules: Part-time and shift employees may have different working days and hours.
• Sending unverified data to payroll: Payroll should receive approved and HR-verified transactions.
• Missing payroll cut-off dates: Late requests need a documented exception process.
• Deducting salary twice: HR should reconcile leave records, attendance, and payroll transactions.
• Failing to explain deductions: Employees should be able to understand why their salary changed and which absence period was involved.
• Keeping no audit trail: Every approval, correction, and salary adjustment should be traceable.

17. Pre-Payroll Unpaid Leave Handoff Checklist

HR and payroll teams can use this checklist before each salary run:

• All unpaid leave applications have been received and recorded.
• The correct leave category has been selected.
• Statutory and contractual paid leave eligibility has been checked.
• Manager approval has been recorded.
• HR verification has been completed.
• Approved dates match the employee's work schedule.
• Unpaid days or hours have been calculated correctly.
• Rest days and non-working days have been treated correctly.
• Part-time and variable schedules have been reviewed.
• Attendance records match approved unpaid leave.
• The applicable salary calculation method has been confirmed.
• Payroll has received the verified transaction.
• Duplicate or cancelled requests have been removed or reversed.
• Salary deductions have been checked.
• The adjustment is reflected correctly in the payslip.
• All approvals and payroll changes have an audit trail.

Conclusion

Setting up unpaid leave approval and payroll handoffs in Singapore requires a coordinated process involving employees, managers, HR, attendance administrators, and payroll teams. Employers should establish a clear policy, verify that the absence is genuinely unpaid, document approval, and record the correct working days or hours.

The payroll handoff should contain complete and verified information, including the employee's schedule, absence dates, approval status, and applicable salary treatment. For monthly-rated employees covered by the Employment Act, the statutory incomplete-month calculation must be applied when unpaid leave results in an incomplete month of work.

By connecting leave applications, attendance records, HR verification, and payroll processing, businesses can reduce errors, improve transparency, and give employees a clearer explanation of salary adjustments.

Follow an unpaid leave request from approval through the payroll input and payslip review. Test InnBuilt with a Singapore employee example.