My husband earns more than his ex and currently we have majority share of his two kids care. Despite this we still pay her child support. The two parent's salaries are added together, then a percentage of that is deemed to be what would be spent on the children from that "salary pool". The percentage of that input into the salary pool and the percentage of care are used to work out who pays who what. The child support is "meant" to cover all reasonable expenses to raise the children. So that means child care, education, health etc. Extras are extras. For example, if you decide you want to put the kids in a private school, that would have to be negotiated with the other parent separately to child support if you want them to contribute to the costs.