Arizona Child Support Calculator

Estimate AZ child support under A.R.S. §25-320. Uses adjusted gross income, the AZ Schedule of Basic Support, parenting time credit, and add-ons for medical, dental, vision, and childcare.

Updated April 2026 A.R.S. §25-320 Private — runs in your browser

NCP Monthly Gross Income

Custodial Parent Monthly Gross

Number of Children

NCP Support for Other Children

Reduces NCP adjusted gross income

CP Support for Other Children

Arizona Basic Child Support

$880/mo

Combined Adjusted Gross$10,000/mo

Basic Support (AZ Schedule)$1,467/mo

NCP Income Share60.0%

Arizona uses the Income Shares model under A.R.S. §25-320. Both parents' adjusted gross incomes determine the basic obligation. Medical, dental, vision, and childcare are added proportionally.

Advanced Calculator

AZ Schedule of Basic Support, parenting time credit chart showing obligation at every overnight level, add-on breakdown, and 10-year year-by-year projection.

+ Open Advanced Calculator

AZ A.R.S. §25-320 Inputs

NCP Monthly Gross

CP Monthly Gross

Children

NCP Annual Overnights

nights

AZ Income Shares Result

$704/mo

Basic Support$1,467/mo

NCP Base Obligation$880/mo

Parenting Time Credit−$176/mo

NCP Income Share60.0%

NCP Overnights/Year vs. Monthly Support (with parenting time credit)

Medical/Dental/Vision/mo

Work Childcare/mo

Total with Add-Ons

Adjusted support: $704/mo

Health/dental/vision: +$162/mo

Childcare: +$252/mo

Total: $1,118/mo

Professional Simulator

Full §25-320 worksheet with itemized income, deductions for other support obligations, medical/dental/vision/childcare add-ons, retroactive support, what-if scenarios, and 20-year lifetime projection with NPV.

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NCP Income & Deductions — Total: $72,000/yr

W-2 / Salary

Self-Employment

Bonuses

Rental Income

Support for Other Children/mo

CP Income & Deductions — Total: $45,000/yr

W-2 / Salary

Self-Employment

Support for Other Children/mo

Custody & Add-Ons

Children

NCP Annual Overnights

nights

Medical Insurance/mo

Dental/Vision/mo

Work Childcare/mo

Extraordinary Expenses/mo

Retroactive Months

mos

AZ §25-320 Professional Analysis

$1,147/mo

NCP After-Tax

Gross: $72,000/yr

Federal tax: −$7,542

SE tax: −$1,696

After CS: $4,083/mo

Support Components

Base (adj. for PT): $722/mo

Medical ins.: +$166/mo

Childcare: +$258/mo

Total: $1,147/mo

How Arizona Child Support Works

Arizona calculates child support under A.R.S. §25-320 and the Arizona Child Support Guidelines using the Income Shares model. Both parents' adjusted gross incomes are combined to determine the basic support obligation from the Arizona Schedule of Basic Child Support Obligations.

Arizona Adjusted Gross Income

Arizona uses adjusted gross income: each parent's monthly gross income minus any existing court-ordered child support payments for other children. Arizona does not deduct taxes before looking up the basic support amount — the schedule is based on gross income, not net income. This differs from states like Washington and Florida that use net income.

Medical, Dental, and Vision Insurance

Arizona requires health, dental, and vision insurance costs for the children to be added proportionally to the basic support obligation. The parent who actually pays the premiums receives a credit, while the other parent pays their proportional share. Arizona specifically covers all three: medical, dental, and vision insurance.

Parenting Time Adjustment

Arizona provides a parenting time credit that reduces the NCP's obligation based on the percentage of overnights they have with the children. The more parenting time the NCP has, the lower their cash support obligation. At near-equal parenting time, the obligations may substantially offset each other.

AZ Adjusted Gross = Gross Income − Other Child Support
Combined Adjusted Gross → AZ Schedule → Basic Support
NCP Base = Basic Support × (NCP Adjusted ÷ Combined Adjusted)
Parenting Time Credit = Basic Support × NCP% × (NCP nights ÷ 365)
NCP Obligation = NCP Base − PT Credit + Medical% + Childcare%

Worked Example

Dad (NCP): $6,000/mo gross. Mom: $4,000/mo gross. Two children. 73 overnights NCP.

Combined Adjusted Gross$10,000/mo

Basic Support (AZ Schedule)~$1,467/mo

Dad's Income Share60%

Dad's Base Obligation$880/mo

Parenting Time Credit (20%)−$176/mo

Adjusted Base$704/mo

+ Medical & Childcare+$402/mo

Total Monthly Support$1,106/mo

Official Sources & Legal References

Frequently Asked Questions

How does Arizona calculate the parenting time adjustment? ▼

Arizona's parenting time adjustment reduces the NCP's cash support obligation based on their actual parenting time. The credit equals the basic support times the NCP's income share times the NCP's parenting time percentage. For example, if an NCP has 20% of overnights (73 nights), their base obligation is reduced by 20% of their proportional share of basic support. The more overnights the NCP has, the larger the credit and the lower the cash support.

What income is included in Arizona child support calculations? ▼

Arizona uses gross income from all sources: wages, salaries, commissions, bonuses, overtime, self-employment income, rental income, investment income, Social Security benefits, disability payments, pension income, and alimony received from prior relationships. Courts may impute income to parents who are voluntarily unemployed or underemployed. Unemployment benefits and workers' compensation are also included as income.

Are dental and vision costs added to AZ child support? ▼

Yes. Arizona specifically requires medical, dental, and vision insurance premiums for the children to be added to the basic support obligation and allocated proportionally. This is one way Arizona differs from some other states — the guidelines explicitly include all three types of health coverage, not just medical insurance. Unreimbursed medical expenses exceeding $250 per year per child are typically shared proportionally as well.

When can Arizona child support be modified? ▼

Under A.R.S. §25-327, Arizona child support may be modified when there is a substantial and continuing change in circumstances. Either parent can request modification by filing a petition. Under the three-year review rule, even without a substantial change, either parent may request a review every three years and the court will recalculate support using current incomes and the current guidelines. A 15% or greater change in the calculated amount typically qualifies as substantial.

When does Arizona child support end? ▼

Arizona child support terminates when the child turns 18 and is no longer attending high school, or upon graduation from high school, whichever occurs last — but not beyond age 19. If a child is still enrolled in a secondary school program at age 18, support continues until graduation or age 19. Arizona courts can also order support for a child with a disability who is unable to be self-supporting, even after age 18 or 19.

When to Consult an Arizona Family Law Attorney

Consult an attorney if your case involves: contested parenting time credit calculations where overnight counts are disputed, self-employed income and adjusted gross income deductions under A.R.S. §25-320, the three-year mandatory review under A.R.S. §25-327 and whether a 15%+ change qualifies, or child support for a disabled child beyond age 19.