Can Child Support Orders Be Modified in Arizona?

March 19, 2026 • | Arsenal Law
Child support orders are designed to reflect the financial circumstances of both parents and the needs of the child at the time they are entered. However, life rarely stays the same. Income changes, parenting schedules shift, and children’s needs evolve over time. Because of this, Arizona law allows parents to request a modification of child […]

Child support orders are designed to reflect the financial circumstances of both parents and the needs of the child at the time they are entered. However, life rarely stays the same. Income changes, parenting schedules shift, and children’s needs evolve over time.

Because of this, Arizona law allows parents to request a modification of child support orders when circumstances change.

At Arsenal Law, we help parents throughout Arizona determine whether they qualify for a modification and guide them through the process of updating child support orders.


When Can Child Support Be Modified in Arizona?

Under A.R.S. § 25-327, child support may be modified when there is a substantial and continuing change in circumstances.

This means the change must:

  • Be significant (not minor or temporary)
  • Be ongoing, not short-term

The court will not modify child support simply because one parent requests it. The requesting party must show that the current order no longer reflects the financial reality of the situation.


The 15% Rule in Arizona Child Support

One of the most important standards in Arizona child support modifications is the 15% rule.

If a new calculation under the Arizona Child Support Guidelines results in an amount that is 15% higher or lower than the existing order, this is generally considered evidence of a substantial and continuing change in circumstances.

This provides a clear, objective way to determine whether modification may be appropriate.


Common Reasons to Modify Child Support

Several situations may justify a modification of child support in Arizona.

Changes in Income

A significant increase or decrease in either parent’s income is one of the most common reasons for modification.

Examples include:

  • Job loss
  • Promotion or raise
  • Career changes
  • Reduction in hours

Courts may also consider whether a parent is voluntarily underemployed.


Changes in Parenting Time

Child support calculations are closely tied to parenting time.

If the number of overnights changes significantly, the child support amount may need to be adjusted to reflect the new arrangement.


Changes in the Child’s Needs

As children grow, their financial needs may change.

This may include:

  • Medical expenses
  • Educational costs
  • Special needs

These changes may justify modifying child support.


Changes in Expenses

Adjustments may also be appropriate if there are changes in:

  • Health insurance costs
  • Childcare expenses
  • Other child-related financial obligations

How to Modify Child Support in Arizona

The process for modifying child support typically involves several steps.

Filing a Petition

The parent requesting the change must file a Petition to Modify Child Support with the court.


Updating Financial Information

Both parents are required to provide updated financial information, including income, expenses, and other relevant details. You do this by filing an Affidavit of Financial Information along with verification of income.


Recalculating Support

The court will apply the Arizona Child Support Guidelines using current information.


Court Approval

If the court finds that a substantial and continuing change has occurred, it may issue a new child support order.

In some cases, parents may agree to a modification and submit a stipulated agreement for court approval.


Can Child Support Be Modified Without Going to Court?

Even if both parents agree on a new child support amount, the modification must still be approved by the court to be enforceable.

Informal agreements that are not approved by the court can lead to disputes and enforcement issues later.


When Does the Modification Take Effect?

In most cases, child support modifications take effect:

  • On the first day of the month following notice of the petition, or
  • On a date determined by the court

This is why it is important to file for modification as soon as a qualifying change occurs.


Why Legal Guidance Matters

Child support calculations can become complex, especially when income fluctuates, parenting time changes, or disputes arise between parents.

Mistakes in the calculation or failure to properly present financial information can result in inaccurate support orders.

At Arsenal Law, we help clients:

  • Determine whether they qualify for modification
  • Accurately calculate child support under current guidelines
  • Present strong evidence to the court
  • Protect their financial interests and their children’s needs

Conclusion

Child support orders are not permanent when circumstances change. Arizona law allows parents to modify support when there is a substantial and continuing change, ensuring that the order remains fair and appropriate.

If you believe your child support order should be modified — or if you are responding to a modification request — experienced legal guidance can help you navigate the process effectively.

To discuss your situation, contact Arsenal Law today.

Call: 480-459-6080
Schedule an initial consultation:
https://arsenallawaz.com/schedule-an-initial-consultation/

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