Child support is money paid by one of the parents to the other to support their children financially after separation or divorce.  Child support is usually paid to the parent that incurs most of the financial weight to care for the children.  Depending on income, even parents that have joint custody may have one parent pay child support In Ontario, the amount of child support is governed by the Child Support Guidelines and depends upon the number of children and the total taxable income (line 1500) of the payor.