An employer has been paid enough to fund an instalment for a person as at a day if the total of the PPL funding amounts paid to the employer for the person for a child before that day is at least the total of the following amounts:
(a) the amount of the instalments the employer has previously paid to, or in relation to, the person for the child;
(b) the amount of the instalment;
(c) the amount of any other instalment that is to be paid to, or in relation to, the person on the payday for the instalment.