3. The support payable by a parent for his child shall be established, on an annual basis, taking into account the basic parental contribution to which the parents should be bound jointly in respect of the child, the child care expenses, post-secondary education expenses and special expenses relating to the child, the disposable income of that parent in relation to that of both parents and the custody time he assumes in respect of the child, in accordance with the following Rules and the form in Schedule I.
The basic parental contribution of both parents shall be established on the basis of their disposable income and of the number of children, in accordance with the table in the Regulation respecting the Basic Parental Contribution Determination Table (chapter C-25.01, r. 12).