Its sickening fact that when fathers leave their kids with ex-wives, the long knives come out, and the hatred he has for her is enacted on the children by refusing to pay, or paying too little maintenance to create a harder life for her.
I am a stepfather to 2 children, 11 and 9 years old - and thier father pays R1200 for BOTH of them per month, out of a salary that after tax is between R13-R16k per month. Luckily I am able to make sure that money is'nt an issue for my wife, and our family.
I do have sympathy for mothers who are divorced and fathers who try and screw the system to pay as little as possible.
According to Child Welfare/Child Advocates Office, the basic calculation is this:
Cost of Child * (Non-Custodial Parent Income / Combined Parent Income)
So, if a child costs R5600 per month, and the child is living with the mother and the father earns R12000 after tax and the Mother R6000 per month, then the calculation is:
R5600 * (R12000/R18000) = R5600 * 0.66 = R3733.33 per month
This is because the father earns almost double what the mother earns, and thus contributes more to the childs costs on a pro-rata basis.
Most non-custodial parents will buy expensive cars and rent/buy larger houses to try and show that thier costs exceed their means to pay an adequate amount. This runs both ways and their are many fathers out there who are also under this kind of duress from resentful ex-wives.
The only ones who suffer in the end are the children.