Arizona Child Support Calculator

This calculator is used to provide you with a broad estimate of monthly child support payments that could be ordered by the court.

Learn About How

Child Support is Calculated

1. Child Support Factors

The calculation for child support itself is simple. Determining and agreeing on the numbers that go into the worksheet is where it can get complicated. Here are the different factors in the child custody calculation:

Each party’s income. When parents are employed, this is usually easy to figure out, but can be complicated by things like bonuses and stock options. The same thing is true of parents who are on government assistance. When parents are self-employed, figuring out their income can become complicated.

Health Insurance. The parent who provides health insurance will get a credit for how much it costs to insure the child alone each month in health insurance. Dental and vision insurance are also included.

Private School Tuition and Childcare (if applicable). Neither private school tuition nor childcare expenses are required to be ordered, but the parties can agree to include or the Court can decide to include them.

Parenting Time Days. The amount of days each parent receives each year is the biggest factor in the child support equation.

Other factors:

  • The age of the child.
  • Any other children for which a parent has a child support order.
  • Any other children not covered by a child support order but for whom a parent has a financial responsibility.
  • Any court-ordered spousal maintenance (alimony) a parent is required to pay or will receive.

2. Arizona’s Child Support Income Shares Model

Arizona uses an income-shares model for calculating child support. How that works is the calculation looks at the parents’ combined incomes and says, for two people making this much money, they typically would spend this amount each month raising the child. The calculation then figures out how much that is per day to raise the child. And then it credits each parent for the amount of parenting time they have, and then splits the difference in proportion to each parent’s income. That’s a mouthful, but let’s look at an example (this is a simplified version of the formula):

Mother and Father make the same amount of money. Mother has their child two-thirds of the time. The calculation shows it costs $100/day to raise their child (insurance, daycare costs, etc).

  • Mother has the child 20 days at $100/day, the worksheet shows her spending $2,000.00 per month on the child.
  • Father has the child 10 days at $100/day, the worksheet shows him spending $1,000.00 per month on the child.

That means Mother is paying $1,000.00 more each month on the child than Father is. This $1,000.00 is then divided pro rata (in proportion to each parent’s income). Since they make the same amount, it is divided in half. Father owes Mother $500.00 per month in child support.

3. Establishing the Legal Parents

Before child support can be ordered, the Court must determine who the legal parents are. To be more clear, we’re talking about establishing paternity through the courts. This may have already been accomplished in the hospital at the time of birth if the parents both signed an Acknowledgment of Paternity that was then filed with the state. If that’s the case, then the parents listed on the Acknowledgment are going to be the child’s legal parents—with some very limited exceptions.

Otherwise, the Court can establish paternity either by both the mother and the alleged father admitting in Court paperwork that he is the child’s father or through DNA testing.

Note that a same-sex couple can be the child’s legal parents in two circumstances: (1) they were married at the time one of them gave birth to the child, or (2) by adoption.

4. Past Due Child Support

Past due child support, is commonly referred to as “Back Child Support”. The Court can order a parent to pay up to three years of back child support, dating back to when the parties separated (or, if they never lived together, when the child was born). But the Court is not required to do so. (The Court can also go beyond three years in certain circumstances).

The Court is most reluctant to order back child support where the parent who was ordered to pay child support has been paying it prior to the Court being ordered. The best evidence of having paid child support prior to it being ordered is to pay it by check, money order, or online transfer with a memo line that reads child support.

5. Clearinghouse (how child support gets paid)

Once child support is ordered, all payments should go through the Clearinghouse. The Clearinghouse is run by the state, and like all bureaucracies, it is imperfect and sometimes inefficient, but in the long run, the Clearinghouse protects both the paying parent and the recipient parent. The Clearinghouse keeps a record of what’s been paid and what’s been owed. This can prevent disputes between the parents down the road.

A paying parent should never pay child support to the recipient parent directly unless the recipient parent is willing to sign in front of a notary an Acknowledgment of Direct Payment. That document should then be filed with the Court. If this is not done, the paying parent could end up paying that child support twice.

Ideally, payments will be taken directly from the paying parent’s paycheck via an Income Withholding Order. This makes paying child support easy and efficient.


What is Custody?

In a broad sense, custody means “legal decision-making and parenting time.” But more specifically, the term “custody” is actually no…


Child Support
By law, every person has a duty to support their biological or adopted children. See A.R.S § 25-501(A). This applies without or without a court order. The term “child support,” though, generally refers the Court-ordered amount one parent is required to pay to the other parent.
Child Support Calculation
This is the official calculation that the state produces every four years for calculating child support. Courts and attorneys use this calculation to determine the ongoing child support amount.
Child Support Calculator
An online tool that people can use to see how much they potentially owe for child support. This tends to be as reliable as the information put into the Child Support Worksheet.
Child Support Clearinghouse
This is the state agency that processes and tracks all child support payments. Though far from perfect, the Clearinghouse’s records can help parties avoid substantial litigation from fighting over whether child support was paid.
Child Support Clearinghouse Calculation
A combination of both payment history, arrears owed, and interest owed, the Clearinghouse Calculation gives both parties an idea of exactly how much child support is owed. In a case on arrears, it is prima facie evidence of what is owed—that means the Clearinghouse Calculation will determine how much is owed unless a party can convince the judge that the Clearinghouse made a mistake in its calculation (and that does happen from time to time).
Child Support Guidelines
A set of guidelines, prepared by a committee of attorneys and judges who review Arizona’s child support statutes, to help judges, attorneys, and litigants understand and calculate child support. A.R.S. § 25-500(3) defines the Guidelines as “the child support guidelines that are adopted by the state supreme court.”
Child Support Income
The parent’s income on which they must pay child support. As defined by Arizona Child Support Guideline § II-A-1(b), “Child Support Income includes income from any source before any deductions or withholdings.  Child Support Income may include salaries, wages, commissions, bonuses, dividends, severance pay, military pay, pensions, interest, trust income, annuities, capital gains, social security benefits (subject to Section VII.B), workers’ compensation benefits, unemployment insurance benefits, disability benefits, military disability benefits, recurring gifts, prizes, and spousal maintenance.”
Child Support Order
The order signed by the judge for child support, which besides providing the amount of child support paid each month, directs how child support should be paid, how unreimbursed medical expenses will be divided, and which parent can claim the child on taxes each tax year. The order may also include orders regarding expenses for extracurricular activities, day care, or private school tuition.
Child Support Subpoena
As defined by A.R.S. § 25-500(4), it means “a subpoena issued pursuant to section 25-520.” That section refers to the Department of Economic Security’s ability to subpoena anyone who may hold information necessary to establish, modify, or enforce child support.
Child support worksheet
This refers to an Excel spreadsheet that contains Arizona’s Child Support Calculation. Attorneys and judges can use the Child Support Worksheet to figure out how much child support is owed. A Child Support Worksheet, which can be a print of the Excel document or an online Child Support Calculator, is required to be filed with certain items, including a Parenting Plan.


Arizona Child Support Articles

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