Arizona uses the Income Shares model — both parents’ gross incomes are combined. Updated for 2026 — covers 50/50 custody, arrears, modifications and Arizona child support laws.
BothParents Income
NoneIncome Cap
18Age Support Ends
10%Arrears Interest
🌵 Arizona Income Shares Model
Arizona Child Support Calculator 2026
Arizona uses the Income Shares model — both parents’ gross incomes are combined.
ℹArizona uses gross income — Gross = total income before any deductions.
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$0$20k
$
$0$20k
$
$
Estimated Monthly Child Support
$0
per month
Annual Total
$0
Combined Income
—
Until Age
18
* Estimate using official Arizona income shares formula. Courts may deviate based on special circumstances. Consult a Arizona family law attorney for your specific situation.
🌵 How Arizona Calculates Child Support
ModelIncome Shares — both parents’ combined gross income
Income CapNo set cap — courts use discretion
Minimum Order$50/month minimum regardless of income
Arrears Interest10% annual interest on unpaid arrears
Arizona Key RuleArizona uses both parents’ gross incomes combined to determine the base obligation
Additional InfoArizona adjusts for parenting time — more overnights with the paying parent reduces support
⚖ 50/50 Custody in Arizona
Does Child Support Apply With 50/50 Custody in Arizona?
In most cases, yes. Arizona does not automatically eliminate child support with equal parenting time.
✓General rule: With 50/50 custody, the higher-earning parent typically pays the lower-earning parent. The amount is reduced vs sole custody but rarely reaches $0.
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$0$15k
$
$0$15k
Estimated Monthly Payment
$0
per month
Without Custody Adj.
$0
Custody Reduction
$0
Net Payment
$0
* 50/50 custody calculations are complex. This is an approximation. Consult a Arizona family law attorney for exact figures.
📋 Arizona Arrears Calculator
Arizona Child Support Arrears Calculator
Calculate total back child support including 10% annual interest Arizona applies to unpaid arrears.
⚠Arizona charges 10% annual interest on all unpaid child support arrears.
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$
$
Total Arrears Owed (with 10% Interest)
$0
including Arizona 10% annual interest
Base Arrears
$0
Interest Accrued
$0
Clear in 1 Year
$0
Clear in 2 Years
$0
Clear in 3 Years
$0
Support Ends Age
18
* Arizona applies 10% annual interest to unpaid child support. There is generally no statute of limitations on child support debt.
🔄 Modification Estimator
Arizona Child Support Modification
Estimate your new payment and check if you qualify for a modification in Arizona.
ℹModification rule: Most states allow modification when the new amount differs by 15-20% or $100/month, OR when there is a material and substantial change in circumstances (job loss, new child, custody change).
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36+ months = eligible for routine review
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Estimated New Monthly Payment
$0
per month
Current Order
$0
New Calculated
$0
Difference
$0
% Change
0%
Likely Qualifies?
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Time Since Order
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* Qualification estimate only. Consult a Arizona family law attorney before filing.
📜 Updated 2026
Arizona Child Support Laws 2026
Key rules, age cutoffs and what you need to know in Arizona.
FORMULA How Arizona Calculates Child Support
Arizona Revised Statutes Section 25-320 governs child support. Arizona uses published Schedule of Basic Child Support Obligations tables based on combined monthly income. Parenting time adjustments apply when the paying parent has 143+ days per year.
AGE When Does Child Support End in Arizona?
Child support in Arizona ends when the child turns 18 — or high school graduation, whichever is later (19 max). Support also ends upon the child’s death, marriage or emancipation. Important: In most cases support does not stop automatically — you need a court order. Stopping payments without a court order creates arrears even after the child reaches the cutoff age.
INTEREST Arrears Interest in Arizona
Arizona charges 10% annual interest on unpaid child support arrears. Arizona’s rate of 10% is among the higher rates in the country. There is generally no statute of limitations on child support debt.
ENFORCEMENT Arizona Child Support Enforcement
Arizona has broad enforcement powers including wage garnishment, tax refund interception, driver’s license suspension, professional license suspension, passport denial, and credit bureau reporting. Criminal charges may apply for significant or long-term non-payment.
MODIFY Modifying Child Support in Arizona
Child support can be modified in Arizona when there is a material and substantial change in circumstances — typically a significant income change, job loss, new children from another relationship, or change in custody. Most states also allow a periodic review every 3 years. File a petition with the court — private agreements to change support are not legally enforceable.
📅 Arizona Payment Calendar
Child Support Payment Calendar 2026
Generate your personal payment schedule and track payments month by month.
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Monthly Total
$0
Annual Total
$0
Next Payment
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Days Until Due
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Payments Remaining
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Marked Paid
$0
* Click Mark as Paid to track payments. Always keep payment receipts.
Need a Arizona Family Law Attorney?
This calculator provides estimates. For filing, modifying or enforcing a child support order, connect with a local family law attorney.