Found this on the Government website
Q3.6 Can an employer deduct the helper’s wages to compensate for damage to
goods caused by him/her? What other items may an employer deduct
from the helper’s wages?
A �� An employer can make deduction for damage or loss to the employer’s
goods or property directly attributable to the helper’s negligence or
default. In any one case, the sum to be deducted shall be the cost of the
damaged item, subject to a limit of HK$300. The total of such
deductions shall not exceed one quarter of the wages payable to the
helper in that wage period.
�� The employer may also make deductions from the helper’s wages under
the following circumstances:
�� deductions for absence from work not exceeding a sum
proportionate to the period of absence;
�� deduction for recovery of any advance or over-payment of wages
made by the employer to the helper. The total sum to be deducted
shall not exceed one quarter of the wages payable to the employee
in that wage period;
�� deductions, at the helper’s written request, for recovery of any
loan made by the employer to the helper; and
�� deductions which are required or authorized under any enactment
to be made from the wages of the helper.
Except with the approval in writing of the Commissioner for Labour, the total
of all deductions, excluding those for absence from work, made in any one
wage period must not exceed one half of the wages payable for that period.
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Read More and look at Q25 and then click on the link under A25, the answer your looking for is in q3.6