Calculate Child Support
Before taxes. Include wages, self-employment, bonuses.
Arizona uses the Income Shares — both incomes required.
0 = no custody · 91 = 25% · 182 = 50/50 · 365 = full custody
$0
estimated monthly support payment
⚠️ Estimate only. Actual court-ordered amounts may vary. Verify with a licensed Arizona family law attorney.
ℹ️ Arizona uses the Income Shares — Arizona uses Income Shares with a Schedule of Basic Support Obligations. Support ends at 18 or high school graduation (max 19).
How Child Support Works in Arizona
Arizona uses the Income Shares to determine child support obligations.
The Income Shares model combines both parents' incomes, finds the basic support obligation from a state schedule, then divides it proportionally. More parenting time (overnights) reduces the non-custodial parent's payment through a parenting time credit.
How Arizona Compares to Other States
See how Arizona's child support rules compare to other states.
| State | Formula | Support Ends | Arrears Rate | Mod. Threshold |
|---|---|---|---|---|
| ★ Arizona (you) | Income Shares | 18 | 10% | 15% |
| Delaware | Melson Formula | 18 | 5% | 10% |
| Idaho | Percentage of Income | 18 | 5% | 15% |
| Michigan | Income Shares | 18 | 5% | 10% |
| Ohio | Income Shares | 18 | 5% | 10% |
| Alaska | Percentage of Income | 18 | 6% | 15% |
| Florida | Income Shares | 18 | 6% | 15% |
| Louisiana | Income Shares | 18 | 6% | 25% |
| New Hampshire | Income Shares | 18 | 6% | 15% |
Showing 8 comparison states. View all 50 states →
Frequently Asked Questions
How is child support calculated in Arizona?
Arizona uses the Income Shares model. Arizona uses Income Shares with a Schedule of Basic Support Obligations. Support ends at 18 or high school graduation (max 19).
When does child support end in Arizona?
Child support generally ends when the child turns 18 in Arizona.
Can I modify child support in Arizona?
Yes. Arizona requires a 15% or greater change in income to qualify. Use our modification checker →
Does 50/50 custody eliminate child support in Arizona?
Not automatically. The higher-earning parent typically still pays support with 50/50 custody. See our 50/50 guide →
What income is used for child support in Arizona?
Income includes wages, self-employment, bonuses, rental income, unemployment benefits, disability payments, and Social Security. Courts may impute income if a parent is voluntarily underemployed.