Under Arizona law, Arizona's Child Support Guidelines define the factors and method for the calculation of child support. The Guidelines consideration the gross income of each of the parents and does not include the income of a new spouse. Generally, the Guidelines determine income based upon a 40-hour workweek, not overtime. Other factors in determining child support are day care expenses, health insurance, whether children are older than 12, the visitation that each parent has with the child, and any special needs that a child may have that require out of pocket expenses from either parent. Unlike child custody, visitation, or any other issues surrounding a divorce or separation, child support is determined by a simple formula. But that is not to say that the system is perfect and you could find yourself in a situation in which you are paying too much or receiving too little. .