What Arizona Child Support Amounts Actually Are

Arizona child support is calculated using a formula based on both parents' gross income, the number of children, and custody time

Arizona does not have a fixed dollar amount for child support. Instead, the state uses an income shares model, which means the court divides child support based on what percentage of the total household income each parent earns. The amount you pay or receive depends on your specific income, your ex-partner's income, how much time each parent spends with the children, and how many children are involved.

The Arizona Department of Child Support Services publishes child support guidelines each year that show the base amount for different income levels and custody arrangements. These guidelines are not a flat rate — they are a starting point that a judge can adjust based on your actual situation. A parent earning $3,000 per month will pay a different amount than a parent earning $6,000 per month, even if everything else is the same.

Key Takeaways

• Arizona calculates child support by combining both parents' gross income and dividing responsibility based on each parent's percentage of that total.
• The state publishes annual guidelines showing base amounts for different income levels, but judges can adjust these amounts based on custody time and other factors.
• Custody arrangement matters: the parent with less than 50 percent custody time typically pays support to the parent with more custody time.
• The guidelines cover children up to age 18, or age 19 if the child is still in high school full-time.

How the income shares formula works

The formula starts by adding both parents' gross monthly income together. Gross income includes wages, salary, bonuses, self-employment income, rental income, and certain other sources — not just what appears on a paycheck. The court then determines what percentage of that combined income each parent earns.

Next, the court looks at the base child support amount from the Arizona guidelines for that combined income level and the number of children. If one parent earns 60 percent of the combined income and the other earns 40 percent, the parent earning 60 percent pays 60 percent of the base amount. The parent earning 40 percent pays 40 percent of the base amount. The difference between what each parent owes becomes the actual child support payment — usually from the higher-earning parent to the lower-earning parent.

Custody time affects this calculation. If both parents have the children exactly 50 percent of the time, the calculation is straightforward. If one parent has the children more than 50 percent of the time, the other parent's support obligation typically increases because the custodial parent has higher direct expenses.

What the 2024 Arizona guidelines show for different income levels

The Arizona guidelines are published as a table showing base amounts for one child, two children, three children, and so on. The amounts increase as combined parental income increases. For example, at a combined income of $5,000 per month with one child and equal custody time, the base amount is different from a combined income of $10,000 per month with the same custody arrangement.

The guidelines cap out at a certain income level — currently around $30,000 per month combined income — after which judges have discretion to set support based on the factors in the case rather than following the table. If both parents earn very high incomes, the court considers the children's standard of living, the parents' ability to pay, and other circumstances.

You can find the current Arizona child support guidelines on the Arizona Department of Child Support Services website or through your local Superior Court. The guidelines change each year, usually in January, so it is important to check the current year's version rather than relying on an older table.

Factors that can change the guideline amount

A judge can adjust the guideline amount up or down based on several factors. These include the cost of childcare needed so one parent can work, health insurance premiums for the children, extraordinary medical expenses, the age of the children, the standard of living the children enjoyed before the separation, and each parent's ability to pay.

Custody time is one of the most common reasons for adjustment. If one parent has the children 70 percent of the time and the other has them 30 percent, the guideline calculation changes. The parent with less custody time typically pays more because they have fewer direct expenses for the children's daily care.

A parent's other child support or alimony obligations can also lower their support amount. If you are already paying child support for children from a previous relationship, Arizona law allows the court to reduce your current support obligation to account for that existing responsibility.

How to estimate your child support amount

To get a rough estimate, you need to know your gross monthly income and your ex-partner's gross monthly income, the number of children, and the custody arrangement. You can then look up the current Arizona guidelines table for your combined income level and number of children to find the base amount.

Multiply that base amount by your income percentage to find what you would owe, or multiply it by your ex-partner's income percentage to find what they would owe. The difference is the monthly payment. This is a simplified version — the actual calculation may include adjustments for childcare costs, insurance, and other factors — but it gives you a ballpark figure.

Many family law websites and some court websites offer child support calculators that walk you through these steps. Keep in mind that an estimate is not the same as a court order. Only a judge or a signed agreement between both parents creates a binding child support obligation.

When child support ends and what changes the amount

Child support in Arizona continues until the child turns 18, or until age 19 if the child is still enrolled in high school full-time. If a child becomes emancipated earlier — meaning they move out and become self-supporting — support may end sooner, but this requires a court order.

The support amount can change if either parent's income changes significantly, if custody time changes, if the number of children changes, or if major expenses like childcare or health insurance change. Either parent can ask the court to modify the order. Some modifications happen automatically if the change is large enough — Arizona law allows for modification if the change in circumstances would result in a 10 percent or more change in the support amount.

Frequently Asked Questions

Does Arizona child support include health insurance and childcare costs?

The base guideline amount does not automatically include these costs, but they are factored into the calculation. The parent responsible for providing health insurance for the children typically pays that premium in addition to the base support amount. Childcare costs needed for work are also added to the base calculation, usually split between parents based on their income percentages.

What if one parent has no income or very low income?

The court does not reduce support to zero just because a parent has no current income. Arizona law assumes a parent can work and earn at least minimum wage. The court may impute income — meaning it assigns an income level based on the parent's age, education, and work history — if the parent is not working or is underemployed. This prevents a parent from avoiding support by deliberately staying unemployed.

Can child support be modified if my income changes?

Yes. Either parent can request a modification if income changes substantially. If your income drops by 10 percent or more, or increases by 10 percent or more, you may be able to change the support amount. You will need to show proof of the income change, such as recent pay stubs or tax returns, and file a modification request with the court.

Is child support the same as custody or visitation?

No. Child support is a financial obligation separate from custody and visitation rights. A parent can owe child support even if they have no custody time, and a parent with custody time still owes their share of support based on their income. The two are calculated differently and enforced through different legal processes.

What happens if someone does not pay child support?

Arizona has enforcement tools including wage garnishment, tax refund interception, driver's license suspension, and contempt of court proceedings. The Arizona Department of Child Support Services can enforce orders on behalf of the custodial parent. Unpaid support can accumulate as arrears, and interest may be added depending on the circumstances.