If you have your children an equal amount of time as your spouse, you have a shared parenting regime. Generally, in that case, the child support payable is determined on a set off basis. The person with the higher income will pay a top up amount of support to the lower income parent. In some cases, the set off approach will not operate fairly and child support will be determined taking into account other factors such as a comparison of each household’s expenses as it pertains to the children.