Child Support

child support calculator

Child support is calculated according to the Arizona Child Support Guidelines.  The guidelines apply the "Income Share Model."  The model incorporate both parents' incomes to create a combined total income.  The proportion of each parent's contribution to the total income is their proportion toward the child support obligation.  

Example: Father earns $5,000 monthly, Mother earns $3,000 monthly. The combined income is $8,500 with Mother's share being 35% and Father's share being 65%. The parents are financially responsible in proportion to their individual income, with Mother paying 35% and Father paying 65% of the child support obligation. The calculation includes other contributing factors such as parenting time, child care costs and health insurance costs.Based upon the individual computing factors, one parent may owe a child support obligation to the other parent.



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child support guidelines

The court, absent special circumstances, adopts the child support calculations according to the Arizona Child Support Guidelines.  The parties may agree to deviate from the recommended child support amount (the guidelines). The court will likely approve the parties’ voluntary agreements concerning the child support amount, however the court is required to make a legal determination that the deviation from the guidelines is fair and just under the circumstances.

Duration of Child Support

The court’s presumptive termination date of a child support order is the minor child’s birthday month at the age of eighteen (18).  If the child is not projected to graduate high school by their 18th birthday, the termination date may be extended to the child’s 19th birthday month or the month of their anticipated graduation date, whichever occurs first.


The child support calculator factors the following expenses in calculating a parent's child support obligation.  

  • cost adjustment for additional children not common to the parties

  • other court ordered child support obligations

  • child care expenses

  • health care premiums

  • other extraordinary expenses

  • parenting time

Parenting Time Calculation

Parenting time exercised by the non-residential parent is attributed as a cost of child rearing and lowers the child support obligation in proportion by shifting the cost from the residential parent to the non-residential parent.  In order to adjust for cost, parenting time is calculated as follows:

-       A period of 12- 24 hours counts as one day.

-       A period of 6 -11 hours counts as half a day.

-       A period of 3-5 hours counts as a quarter day.

-       A period of less than 3 hours may count as a quarter day if the non-residential parent pays for all routing expenses for the child, such as meals.



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