Child Support in AZ: Calculations, Enforcement, and Modifications

Child support in Arizona is calculated under the Income Shares Model, which combines both parents’ incomes, estimates what the family would have spent on the child together, and splits that obligation proportionally. The amount is then adjusted for health insurance, childcare, and how much time the child spends with each parent. Payments run through a state clearinghouse, and the enforcement tools behind an order are strong enough that ignoring one is genuinely risky.

How the Amount Is Calculated

Arizona’s Child Support Guidelines start by adding both parents’ incomes together and matching the total to a standard support schedule. Each parent then owes a share proportional to what they earn. A parent who brings in 60% of the combined income is responsible for roughly 60% of the basic obligation.¹

What Counts as Income

The guidelines use a broad definition called “Child Support Income.” It includes wages, salaries, commissions, bonuses, dividends, severance pay, pensions, interest, trust income, unemployment benefits, workers’ compensation, disability benefits, military pay and allowances, and recurring gifts. Self-employment income is gross receipts minus ordinary business expenses. Non-cash employment perks like a company car or employer-provided housing get assigned a dollar value when they meaningfully reduce a parent’s personal living costs.²

Means-tested public assistance such as TANF and SSI, food assistance, child support received for another case, and disability benefits received on behalf of a child do not count as income.²

Insurance, Childcare, and Parenting Time

Once the basic obligation is set, the court adds the cost of the child’s health, dental, and vision insurance premiums and any work-related or school-related childcare. Those costs are split in the same income proportion.

Parenting time then produces one of the largest adjustments on the worksheet. Arizona’s Parenting Time Table assigns a percentage based on how many days per year the noncustodial parent has the child. Fewer than 20 days a year gets no adjustment. At 100 to 114 overnights the adjustment is 17.5%; at 143 to 152 days it climbs to 32.5%; and at 164 or more days it reaches 50%. The percentage is multiplied against the basic obligation and subtracted from the noncustodial parent’s share, so a parenting schedule that lands near a tier boundary can noticeably change the monthly payment. Time blocks shorter than 24 hours count as fractions of a day based on their length.³

Imputed Income

A parent cannot sidestep support by choosing not to work. When a parent is voluntarily unemployed or underemployed, the court can impute income and calculate support as though the parent earned what they are capable of earning. If there is no better evidence of earning capacity, the court presumes full-time minimum wage.⁴

Getting an Order in Place

There are two routes to a support order. You can file a petition yourself with the Clerk of the Superior Court, which costs $191 in filing fees, and then serve the other parent through a process server or the sheriff.⁵ If both parents agree on the numbers, a stipulated agreement can resolve the case without a full hearing; otherwise a judge or commissioner reviews the evidence and sets the amount.

You can also open a case through the Arizona Division of Child Support Services (DCSS), part of the Department of Economic Security. DCSS can establish paternity, set an order, collect payments, and later modify or enforce it, with the Attorney General’s office handling the legal work.⁶ That matters for parents who cannot afford an attorney. The trade-off is caseload: the process generally takes longer than a privately filed case.

Either way, both parents must complete an Affidavit of Financial Information, a sworn statement of income, expenses, assets, and debts. The Maricopa County version requires the two most recent pay stubs and federal income tax returns from the last three years with all W-2 and 1099 forms attached.⁷ Bring documentation of the child’s insurance premiums, childcare receipts, and any existing child support orders for children from other relationships, since those obligations factor into the calculation.⁸ The affidavit is signed under oath, and hiding income can produce penalties and retroactive adjustments later.

How Payments Are Made

Arizona routes payments through the Support Payment Clearinghouse, run by the Department of Economic Security. Parents do not pay each other directly. The clearinghouse creates an official payment record that protects both sides if a dispute arises.

Income withholding from the paying parent’s wages is the default under Arizona law and happens in most cases.
Online or phone payments can be made through the state’s Payment Gateway or iPay system at no extra fee, or by calling 1-800-882-4151.
Checks, money orders, and cashier’s checks can be mailed to the clearinghouse in Phoenix.
Cash payments are accepted at participating retailers through PayINCashNow for a $2.49 fee.
The TouchPay Child Support Mobile Application accepts payments with a 2.85% convenience fee.

Paying the other parent directly, outside the clearinghouse, is a bad idea. If a payment dispute reaches court, the clearinghouse record is the primary evidence, and informal cash handoffs may not count as credit against the obligation.⁹

What Happens When Payments Fall Behind

Enforcement tools escalate quickly, and most of them do not require a hearing before they take effect.

Income Withholding

An income withholding order tells the employer to deduct support from each paycheck and send it to the clearinghouse within two business days of payday. In DCSS cases, the department can issue this order without prior notice to the paying parent. If arrears exist, the order can add an extra 25% to 33% of the current obligation to chip away at the past-due balance, depending on how far behind the parent is.¹⁰ Federal law caps total wage garnishment for child support at 50% of disposable earnings for a parent supporting another spouse or child, and 60% otherwise, with each limit increasing by 5 percentage points when the parent is more than 12 weeks behind.¹¹

Tax Refund Intercepts

Arizona can intercept both state and federal income tax refunds. The state offset starts at just $50 in arrears. Federal intercepts require at least $150 in arrears if the custodial parent receives public assistance, or $500 if not.¹²

Liens, License Suspension, and Passport Denial

A support order in a DCSS case automatically creates a lien on property the paying parent currently owns or later acquires, perfected by filing with the county recorder. Once recorded, the parent cannot sell real estate or transfer titled property without resolving the debt.¹³

A parent at least six months behind can lose their driver’s license, recreational licenses, and professional or occupational licenses. DCSS sends notice first; if the parent does not respond or catch up, the department refers the case for suspension, with professional licenses handled by administrative order directly to the licensing board.¹⁴

When arrears exceed $2,500, the state certifies the case to the federal Office of Child Support Enforcement, which notifies the U.S. Department of State. State will refuse to issue or renew a passport and may revoke an existing one, and no state agency can waive the denial.¹⁵

Contempt and Interest

A parent with the ability to pay who refuses can be held in contempt. Sanctions can include incarceration, fines, seizure of property, and mandatory employment services, and failing to appear at an enforcement hearing can draw an arrest warrant. The court sets conditions the parent can meet to purge the contempt.¹⁶

Past-due child support accrues interest at 10% per year on the principal, starting at the end of the month after the payment was due. A $10,000 arrears balance adds $1,000 in interest annually, and that interest is enforceable through every tool above.¹⁷

Changing an Existing Order

A modification requires a substantial and continuing change in circumstances. A slow month at work will not qualify; the change needs to be ongoing. Common triggers are a significant income shift, a change in the child’s health insurance costs, or a meaningful change in parenting time.

The guidelines treat a 15% or greater gap between the current order and a recalculated amount as evidence of a substantial and continuing change. When the numbers hit that threshold, a simplified modification procedure is available to either parent, a third-party caregiver, or DCSS, avoiding the full hearing that a standard modification requires.¹⁸

Losing a job does not automatically pause or reduce the obligation. The existing order remains in force, arrears keep accumulating, and DCSS deducts child support directly from unemployment insurance benefits up to 50% of the benefit. A parent who becomes involuntarily unemployed should file for modification right away.¹⁹

A new spouse’s income is not included in the calculation. Only the income of persons with a legal duty of support to the child in question counts, and remarriage by itself is not grounds for modification.² A court can still consider the broader picture: if a new spouse covers most household expenses, freeing up the parent’s own income, a judge may find financial circumstances have substantially changed. Court-ordered support for children from other relationships comes in as a deduction, which can lower the amount owed in the current case.⁸

Timing matters. For a brand-new order where none existed before, the court can set support retroactive to the date of the original petition. For a modification of an existing order, the new amount generally applies only from the date the modification request is filed forward. Waiting months to file means paying the old amount for those months with no later credit.⁴

When Support Ends

A child is considered emancipated, and the support obligation ends, when the child turns 18, marries, is adopted by someone else, or dies.²⁰

Two exceptions matter. If the child is still in high school or an equivalency program at 18, support continues until the child finishes or turns 19, whichever comes first, and the paying parent can obtain attendance records to verify enrollment. For a child with a severe mental or physical disability that began before adulthood, the court can order support to continue indefinitely past the age of majority if the child cannot live independently.⁴

Arizona courts cannot order a parent to pay college expenses through child support. No statute authorizes it. Parents can agree to share college costs and have that agreement incorporated into an order, but a judge cannot impose it over a parent’s objection.²¹

Emancipation does not wipe out arrears. Any past-due balance, with its accrued interest, remains enforceable until paid in full.

1
Arizona Judicial Branch. Arizona Child Support Guidelines
2
Maricopa County Superior Court. Arizona Child Support Guidelines – Section: Determining Income
3
Maricopa County Superior Court. Arizona Child Support Guidelines – Section: Adjustment for Costs Associated with Parenting Time
4
Arizona Legislature. Arizona Code 25-320 – Child Support; Factors; Methods of Payment; Additional Enforcement Provisions; Definitions
5
Arizona Judicial Branch. Superior Court Filing Fees
6
Arizona Department of Economic Security. Child Support Services
7
Superior Court of Arizona in Maricopa County. Affidavit of Financial Information
8
Arizona Judicial Branch. About the Child Support Calculator
9
Arizona Department of Economic Security. Parents Who Pay Child Support
10
Arizona Legislature. Arizona Code 25-505.01 – Administrative Income Withholding Order; Notice; Definition
11
Office of the Law Revision Counsel. 15 USC 1673 – Restriction on Garnishment
12
Arizona Department of Economic Security. Division of Child Support Services Customer Resource Guide
13
Arizona Legislature. Arizona Code 25-516 – Lien; Priority; Recording; Information Statement; Payoff Amount; Release
14
Arizona Legislature. Arizona Code 25-517 – License Suspension; Notice; Administrative Review or Hearing
15
Office of the Law Revision Counsel. 42 USC 652 – Duties of Secretary
16
Arizona Legislature. Arizona Code 25-502 – Jurisdiction, Venue and Procedure; Additional Enforcement Provisions
17
Arizona Legislature. Arizona Code 25-510 – Receiving and Disbursing Support and Maintenance Monies
18
Maricopa County Superior Court. Arizona Child Support Guidelines – Section: Modification
19
Arizona Department of Economic Security. Child Support and Unemployment – Questions and Answers
20
Arizona Legislature. Arizona Code 25-503 – Order for Support; Methods of Payment; Modification
21
Arizona Legislature. Arizona Code 25-501 – Duties of Support; Exemption