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.

Child Custody FAQs

Can I request a name change for a child because they are going through a gender transition?

Yes. Although this case did not involve a child, in in re Cortez, 247 Ariz. 534 (App. 2019), the Arizona Court of Appeals recently held a Court could not reject a name change simply because it is requested for a gender transition. Further, the Court pointed to a Virginia case that held a gender transition is a valid basis for requesting a name change. 

Like any other name change for a child, the issue will turn on whether the proposed name change is in the child’s best interests.  

Can you change first names too, or does the law only apply to last names?

Yes, it applies to both first and last names. Although parents more commonly are disputing the child’s last name, the law equally applies to first names and uses the same standards. 

That was the issue in Munguia v. Ornelas, 253 Ariz. 549 (App. 2022), where the Father asked for the child’s first names to also include the Father’s requested first name. The trial court granted his request, and Mother appealed. The Arizona Court of Appeals held that the Pizziconi factors apply to both first and last names, analyzed those factors, and then upheld the trial court’s order.  

The other parent’s rights have never been established. Are they entitled to know I’m filing a Notice of the Requested Name Change?

Yes. The law requires you notify anyone who may have an interest in the name change. That would include a biological parent whose rights have not yet been established.

Should I argue that my new spouse is more of a parent to the child than the other parent is; therefore, the child should bear my new spouse’s last name instead of the other parent’s last name?

Probably not. If the other parents’ parental rights are still intact, a Court will likely view the requested name change as being contrary to the child’s best interests because it could be viewed as attempting to harm the relationship the child has with a legal parent. Remember one of the Pizziconi factors is the effect the change has on a relationship with each parent. While we recognize that, in some cases, a stepparent has become vitally important to the child’s life and is more of a parent to the child than the actual parent, the law is not going to put a stepparent on the same level as a legal parent.

What is the standard the Court looks at when deciding whether to change the child’s name?

The Court must look at whether the name change is in the best interests of the child. A.R.S. § 12-601(B). To aid in that, the Arizona Court of Appeals has come up with five factors known as the Pizziconi factors. They are as follows: 

  1. The child’s preference
  2. The effect a name change would have on preserving and developing the relationship with each parent 
  3. The length of time the child has borne a given name 
  4. The difficulties, harassment, or embarrassment that the child may experience from bearing the present or proposed name 
  5. The motive of the parents and the possibility that the use of a different name will cause insecurity or a lack of identity 

The Court must also consider certain items under A.R.S. § 12-601(C), which are aimed at ensuring the name change is not being filed for a fraudulent purpose (and, honestly, are more geared for adults who want to change their name). These elements include whether the person requesting the change has a felony background or is facing felony charges for making a false statement or false identification.  

What if the other parent does not agree to change the child’s name?

Then you can ask the Court to change it. You do so by filing a Petition for a Name Change with the family court. You can also bring a name change as its own petition or as part of a legal decision-making or parenting time proceeding

Once the child has a name, can it be changed?

Yes, a child’s name can be changed. Any changes to the child’s name either need to be agreed upon by the parents or ordered by the Court.

I am a father, and the mother didn’t give our child my last name. Can’t I require that the child has my last name?

Not necessarily. The law does not require that the child bear the father’s last name. If you want the child to bear your last name, you will need either a Court order or the agreement of the other parent.

In Pizziconi v. Yarborough, 177 Ariz. 422 (App. 1994), the Arizona Court of Appeals rejected the idea that a child must bear a father’s surname and adopted the reasoning from the Supreme Court of Utah that because these are now times of parental equality, it is no longer automatic that a child bears a father’s surname. Instead, the issue must be decided on in the child’s best interests.  

If I have legal decision-making, can I change my child’s name?

No, the authority to change the child’s name is not included within the legal decision-making authority. You will need either a Court order or the agreement of the other parent.

If I am ordered to pay child support or spousal maintenance, and I appeal the ruling, do I have to pay child support or spousal maintenance while the appeal is pending?

Yes. Child support and spousal maintenance do not get suspended because of an appeal. You have an ongoing obligation to pay those amounts. If the appeal changes the order, you will receive a credit for any amount you overpaid.

How do the courts decide custody cases?

The best interests of the child are the standard under which the Court determines all matters relating to the child. To assist the Court in this function, the Legislature has enacted the 11 best interest factors listed in A.R.S. § 25-403. Parties should address these factors in their Pretrial Statement and at trial. The Court must make written findings on the 11 factors at trial.

What is Legal Decision Making?

As for legal decision-making, the Court will decide whether both parents or one parent will make the legal decisions. The Court can even assign that one parent have decision-making for one specific area of legal decision-making. For example, in instances where parents cannot decide on what school the child will attend, the Court will “split the tie” by awarding one parent decision-making over educational issues only.

What is Parenting Time?

For parenting time, what must be decided goes far beyond just setting a regular schedule. There must also be orders regarding holiday parenting time, vacation schedules, communication between the parties, communication with the child when in the other’s parents care, and exchange protocols. By law, whenever parenting time is decided, child support must be decided as well.

What is Arizona Custody Public Policy?

A.R.S. § 25-103(A) requires judges to apply the custody provision in a way that promotes strong families and strong family values. A.R.S § 25-103(B) says that, absent evidence to the contrary, it is in the child’s best interest for both parents to participate in legal decision-making and for each parent to have substantial, frequent, meaningful, and continuing parenting time with both parents. This policy is significant because best interests of the child is the standard Courts use to determine legal decision-making and parenting time. In Woyton v. Ward, the Arizona Court of Appeals found this public policy means there is a rebuttable presumption that parenting time should be equal, but in Gonzalez-Gunter v. Gunter, the Court also found that courts are not required to order equal parenting time just because both parents can safely watch the child if equal parenting time is not in the child’s best interests.

What is Custody?

In a broad sense, custody means “legal decision-making and parenting time.” But more specifically, the term “custody” is actually no longer used in Arizona. In 2012, the Arizona Legislature passed, and Governor Brewer signed, a bill that renamed custody as “legal decision-making and parenting time.” The thought was that many parents fought over “custody” without understanding what it really meant, so the Legislature reasoned if they made terms more descriptive of the rights involved, there would be less conflict over “custody.” So legal decision-making and parenting time are descriptive terms. Legal decision-making means the right to make decisions on behalf of your child when it comes to major decisions in the areas of healthcare, education, religious, and personal care decisions. And “parenting time” means the schedule of when the child is with each parent.

What is decided in a custody case?

Broadly speaking, legal decision-making, parenting time, and child support.

Why did Arizona change what “child custody” means?

In 2012, the Legislature changed the meaning of the termcustody because they were concerned too many people fighting for custody did not understand what they were fighting for. There was a feeling that some people pursued “custody” simply because it was what a parent is supposed to do. The Legislature thought if they made the terms more descriptive of the rights being pursued, parents could make an informed decision of whether it was something they wanted to pursue in Court. The Legislature hoped the change might lessen conflicts and litigation.  

The other parent refuses to follow the Parenting Plan. What can I do?

You have a few options: The first option is to enforce the Parenting Plan by filing a Petition to Enforce. A Parenting Plan is a Court order, and the Court can enforce its order. It can do so by imposing penalties on the offending parent or requiring them to attend certain classes or counseling to help them learn how to co-parent. Another option may be to modify the Parenting Plan. Depending on the infraction, the Court could make small adjustments to the plan, put conditions on the parent’s time with the child or adjust parenting time and legal decision-making altogether. 

For child custody, is Arizona a “Mother’s state”?

No. Arizona is a gender-neutral state, meaning it does not favor one parent over the other because of gender.

What do the Arizona courts try to achieve in a custody case?

In an ideal world, judges are trying to create a situation where both parents are equally involved, and the child is safe, loved, provided for, and cared for. The parents communicate well with each other and both are involved in the child’s education and attend the child’s medical appointments, school events, and extracurricular activities without any drama whatsoever. That would be the ideal, but most cases are going to fall short of that—and many will not come anywhere close to that. In those situations, the child’s safety must be tended to first, but after that, the court and others have developed programs to help parents communicated better, coparent better, and keep the focus on what is best for the child. Attorneys are aware of these programs and can talk to you about what solutions might fit your situation. 

What should I be doing to prepare for a modification?

The answer depends a little bit on your circumstances, but generally speaking, you should be keeping a timeline of events that have occurred and any evidence you might have to support it. If for instance, the other parent sends you a nasty text message, you should have a place where you write down the date and what was said, and then print out the text message and save it with the other evidence you have.  

If the Court ordered you to do certain things, such as attend counseling or complete a parenting class, make sure you do that and keep a record of it. The items the Court requires of you are not only mandatory, but i the judge is signaling to you what changes the judge wants to see before increasing your access to the child. You may not agree with the judge, but we recommend you follow what the judge has required of you to increase your chances for a better result next time around.  

For spousal maintenance and child support, keeping your financial records so that you are ready to go on discovery and disclosure is important and can save you a lot of time and money when you are ready to modify.  

How long do I have to pay child support for?

You must pay child support until your child is 18 and graduated from high school or until they turn 19 years old.

Child Custody Terms

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.

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