Child support laws were recently overhauled in March 2020. The basic concepts are still the same. If one parent has primary physical custody, the other parent generally pays full child support. If the parties have joint physical custody, then each pays each other on paper, but the parent earning more pays the difference. The more children you have with the other parent, the greater the percentage of income is taxed for child support.
Child support is a divisive issue. The parent receiving support needs more, but the paying parent can barely afford to pay, if at all. This is where strong advocacy helps out. Peter is well versed in child support law and can advocate on your behalf.