After the determination of a parent–child relationship, the next step is to calculate the appropriate    amount of child support. The formula used to calculate the appropriate amount of support is known          as the child support guidelines. California law provides guidelines to courts for setting the child        support payment amount. 
Child Support guidelines are based on each parent’s net disposable monthly income and the amount of time the child is cared for by each parent. For the purpose of deciding child support payment amounts,    the court considers income from all sources, whether or not it is reported or taxed under federal law.      The guidelines came into effect as part of an effort to make the calculation less of a judgment call and more of a mathematical equation.  Examples of circumstances that can affect the calculated child support      amount include a child’s educational expenses, special needs expenses, or travel expenses for a distant parent.
The income can be in the form of money, property or services, and includes:
  • Wages from a job
  • Tips
  • Commissions
  • Bonuses
  • Self-employment earnings
  • Unemployment benefits
  • Disability and workers' compensation
  • Interest
  • Dividends
  • Rental Income
  • Social Security or pensions
  • Any payments or credit due or becoming due, regardless of the source, including lottery and prize winnings
  • Usually, a new spouse's income is not considered in setting support, however, we have seen judges consider      the effect that such income has on the net disposable income; therefore, it's probably worth a shot to mention    it if you are the receiving party, or where the difference in incomes between the two parents is vastly different.
The court determines net disposable income for each parent by considering certain items from his or her income, including:
  • Taxes
  • Ordinary union dues
  • Ordinary retirement contributions
  • Health premiums
  • Child or spousal support actually being paid
  • Costs of raising children from another relationship
The court uses the net disposable income for each parent
 and the percentage of time each parent spends with kids:

child support calculator

**If you are self employed, or have other children (not of this relationship), or have
tried to start your own business and borrowed money to do so, or if you had to quit your job
for varying reasons, or if you are re-married and the spouse loaned you separate money, or if you inherited money or won money via lotto or gambling; if you are actually married and won a large amount
in the state lotto; if you owe huge taxes and cannot pay them; if you owe real estate taxes and may lose your house; if you have credit card debt that you cannot keep up with and are losing 50% of your
pay before you even get your check; any of these situations , you should call attorney herein FIRST---before you make a big error or mistake.  Attorney has seen nearly all of the mentioned situations and some of them are quite workable if you don't do it wrong.
The DCSS calculator for California, is online at no cost; it will not be "exactly" the same as the one in Court, but it will be very close.