Employment Ordinance

(1)
It shall be presumed that an annual payment or annual bonus is not of a
                gratuitous nature and is not payable only at the discretion of the employer unless
                there is a written term or condition in the contract of employment to the
                contrary.
(2)
For the avoidance of doubt, it is hereby declared that subsection (1) shall not
                apply to any contract of employment made before the
                    commencement
*
of this section.