How to Calculate Mid-Month and Partial Salary for a Domestic Helper in Hong Kong
⚡Quick Summary
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For most household employers in Hong Kong, monthly payroll is quick and straightforward when it aligns with the standard calendar month. However, because a domestic helper often arrives or begins employment on custom dates, thousands of families accidentally lock themselves into irregular mid-month pay cycles—like paying from the 18th of one month to the 17th of the next.
When a contract ends in the middle of a pay cycle—whether your domestic helper completes their natural two-year term or leaves early—calculating partial pay for that broken month can easily lead to payroll errors and potential legal disputes.
This step-by-step guide breaks down the legal rules for mid-month pay, explains how to handle shorter months, and provides a clear plan to switch to a clean calendar-month cycle.
What is a Rolling Pay Cycle Under Hong Kong Law?
Under the Interpretation and General Clauses Ordinance (Cap. 1), a "month" legally means a calendar month. Under Hong Kong employment rules, a rolling calendar month begins on the day your domestic helper starts work and ends the day before that same date in the following month.
Handling Shorter Months
A standard cycle starting on the 28th runs from 28 January to 27 February (31 total calendar days). However, when a cycle starts on a date that does not exist in the following month (such as the 30th or 31st), Hong Kong law mandates that the cycle officially ends on the final day of that next month. This alters your mathematical denominator:
Case 1 (The February Trap): A cycle starting on 30 January ends on 28 February (or 29 February in a leap year). The cycle is exactly 30 days long (or 31 days in a leap year).
Case 2 (Tail-End Compression): A cycle starting on 31 January ends on 28 February (or 29 February in a leap year). The cycle is exactly 29 days long (or 30 days in a leap year).
Case 3 (The 31-Day Slip): A cycle starting on 31 August ends on 30 September, making the cycle exactly 30 days long.
Key Rule: To calculate partial month wages, you must divide by the exact total calendar days of that specific cycle. Dividing by 30 as a flat shortcut is illegal because a single working day is legally worth slightly more in a short 28-day cycle than in a 31-day cycle.
How to Calculate Mid-Month Pay for Domestic Helper (Proration Step-by-Step)
When your helper leaves mid-cycle, use the exact calendar days inside that active rolling cycle to find your math base.
Worked Example (Based on a monthly salary of HK$5,100)
Assume your helper's regular pay cycle runs from the 28th of each month to the 27th of the next month. Your domestic helper resigns, and her Last Work Day is 10 March.
Step 1: Identify the active rolling month
The final days fall into the cycle running from 28 February to 27 March.
Step 2: Find the total calendar days in this cycle (Denominator)
1 day in February (28 February) + 27 days in March (1 March to 27 March) = 28 days total (non-leap year).
Step 3: Count the days worked (Numerator)
1 day in February (28 February) + 10 days in March (1 March to 10 March) = 11 days worked.
Step 4: Execute the calculation
The Shifting Value of a Working Day
If the helper works the exact same number of days (11 days) but leaves during a cycle running from 28 April to 27 May with a departure date of 8 May:
Total days in cycle: 3 days in April + 27 days in May = 30 days total.
Days worked: 3 days in April + 8 days in May = 11 days worked.
Even though the helper worked 11 days in both cases, the payout differs. A shorter 28-day cycle gives each day a higher monetary value. Using a flat 30-day shortcut violates Cap. 1 and results in a legal underpayment.
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The Strict 7-Day Settlement Deadline
Under the Hong Kong Employment Ordinance (Cap. 57), all final termination payments—including prorated wages, notice pay, and annual leave cash-outs—must be settled no later than 7 calendar days after the termination date. Missing this deadline is a criminal offense.
Switching to a Clean 1st-to-31st Pay Cycle
Under Section 70 of Cap. 57, statutory rights cannot be signed away. Even if a domestic helper signs an agency receipt agreeing to flat-rate math, that signature is legally void at the Labour Tribunal if an underpayment occurred.
The Permanent Solution
Align your helper's pay cycle to the standard calendar month (1st to the last day of the month). This restricts prorated calculations strictly to the first and last months of employment:
First Month: Calculate partial pay from the start date (e.g., 28th) to the end of that first calendar month.
Middle Months: Pay the flat monthly wage written in contract ID407 without counting days.
Last Month: Calculate partial pay from the 1st of that month up to the Last Work Day.
How to Transition Legally
Draft a Written Agreement: Prepare an addendum stating that both parties agree to switch to a standard calendar month.
Pay a One-Time Transition Amount: Pay the partial block of days needed to close out the old mid-month cycle at month-end.
Issue an Itemized Receipt: Have your helper sign a dated physical receipt confirming full payment for the transition period.
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Frequently Asked Questions (FAQ)
1. Can I divide monthly salary by 30 to get daily wage for a partial month?
No. Dividing by 30 violates Cap. 1. Because months vary in length (28, 29, 30, or 31 days), daily rates vary. You must divide by actual calendar days in that specific cycle.
2. My helper signed a receipt agreeing to a flat 30-day shortcut. Am I safe?
No. Under Section 70 of Cap. 57, statutory rights cannot be waived. Signed shortcuts are legally void at the Labour Tribunal if an underpayment occurred.
3. What happens if I miss the 7-day final payment deadline?
Under Cap. 57, failing to clear outstanding wages, notice pay, or leave cash-outs within 7 days of termination is a criminal offense subject to fines and prosecution.
Disclaimer: The information provided in this article is for general educational and sharing purposes only and does not constitute formal legal advice. For specific payroll scenarios or active contract disputes, readers are highly advised to directly consult the Hong Kong Labour Department or a qualified legal professional.
Written by LAI YIU | Legal Specialist in Hong Kong Labour Law
Reviewed for Legal & Statutory Accuracy | Updated for 2026 Regulations
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