Child support is more arithmetic than argument — until it isn't. When income is variable, self-employed, or hidden, the Guidelines worksheet is only the starting line.
Child support in Arizona is formula-driven, but the formula is only as accurate as the income figures dropped into it — and that is where most disputes actually live. For W-2 employees the calculation is largely mechanical: gross wages, healthcare premiums attributable to the children, work-related childcare, and parenting-time adjustments produce a number the court will almost always adopt. For self-employed parents, owners of professional practices, real-estate investors, and anyone whose K-1 income bears little resemblance to the cash actually flowing into the household, the calculation requires forensic work. We routinely review three to five years of returns, deposit history, and lifestyle indicators to reconstruct true gross income for Guideline purposes. Judges in Maricopa County are familiar with the pattern of an obligor who 'pays himself' a modest W-2 from his own LLC while the business covers vehicle, travel, phone, and meal expenses; we know how to put that pattern on the record.
Modification is where many parents lose money unnecessarily — not because the law denies relief, but because they wait too long to ask for it. Arizona only allows retroactive modification back to the date of the petition. A father who loses his job in January but waits until July to file a petition cannot recover the six months of payments calculated on his prior income; they remain due, with interest, even after the new order issues. We tell every potential modification client the same thing in the first call: if circumstances have already changed materially, file now and litigate later. The filing itself preserves the date and protects against arrears accruing under a stale order.
Enforcement is the third pillar. When payments stop, we move through a defined sequence: written demand, petition for contempt, request for wage assignment, intercept of tax refunds and lottery winnings through the Clearinghouse, license suspension where statutorily available, and in serious cases a judgment that can be domesticated against out-of-state property. We coordinate with the Division of Child Support Services when it accelerates relief and we proceed independently when DCSS is too slow. Arrears in Arizona accrue 10% simple interest, so the financial penalty for non-payment compounds quickly, but only if the receiving parent actually documents what is owed. A clean payment ledger — every transaction routed through the Clearinghouse rather than cash or Venmo — is the single most useful document an enforcement client can bring to the first meeting.
At a glance
- Calculations under the most current Arizona Child Support Guidelines.
- Income reconstruction for self-employed and 1099 parents.
- Aggressive enforcement: contempt, wage assignment, license sanctions.
- Modification when income or parenting time materially changes.
Calculating support
We forensically review tax returns, K-1s, perquisites, and historical bank deposits to arrive at an income figure a court will accept. We then run scenarios for parenting time, healthcare, and childcare to model the full obligation.
Modification & enforcement
Lost a job, took a new one, or watched a co-parent's income jump? A material change of circumstances can be the basis for a new order. When payments stop, we move quickly with contempt, wage assignment, and license actions.
Self-employed and cash-business obligors
When the other parent runs a business, we look beyond Schedule C — at lifestyle, deposits, and undisclosed perks — to establish true gross income for Guidelines purposes.
Add-on expenses
Health insurance premiums, uncovered medical, childcare for work or school, and extracurriculars are allocated by share of combined income — they belong in the order, not in a side fight later.
Arrears and interest
Arrears in Arizona accrue interest at 10% simple. We pursue collection through the Clearinghouse, intercepts, and direct judgment when warranted.
Representative results
Past outcomes do not guarantee a future result. Details are generalized to preserve client confidentiality.
- Reduced a Mesa father's support obligation by 38% after documenting a permanent change of employment.
- Established arrears and a wage assignment against an out-of-state obligor through UIFSA registration.
- Defeated an upward modification by reconstructing the obligor's true gross income from deposit history.
Common mistakes to avoid
- Making payments directly to the other parent rather than through the Clearinghouse — credit is hard to prove later.
- Waiting to file for modification after a job loss; the new order can only be retroactive to the filing date.
- Treating extracurricular costs as informal — get them allocated in the order.
Fees
Flat-fee or hourly. Modification and enforcement matters are usually quoted as flat fees with defined scope.
How a case moves through our office
- 01
Income worksheet
We assemble pay records, tax returns, and bank statements for both parents.
- 02
Guidelines run
Multiple scenarios — parenting time variants, insurance allocation, childcare.
- 03
Filing
Petition to establish, modify, or enforce — including request for retroactive support where allowed.
- 04
Hearing
Evidentiary hearing if contested; otherwise consent order submitted.
Governing law
- A.R.S. § 25-320
- Child support — establishment, modification, and Guidelines authority.
- Arizona Child Support Guidelines
- Current schedule and instructions issued by the Arizona Supreme Court.
Citations are general references, not legal advice. Statutes are amended; consult counsel for the current text as it applies to your matter.
Child Support by city
Each page below covers the local court, ZIP codes, neighborhoods, and the issues that come up most in that city.
Common questions
- Can support be ordered retroactively?
- Yes — generally back to the filing date, and in paternity cases up to three years prior.
- How often can support be modified?
- Anytime a substantial and continuing change of circumstances exists — generally a 15% variance from the current order.
- Does parenting time change support?
- Yes. The Guidelines include a parenting-time adjustment that increases with overnights.
- What if my ex is hiding income?
- We subpoena bank records, depose the obligor, and ask the court to attribute income consistent with lifestyle.
- Can support continue past 18?
- Yes, until graduation from high school (up to age 19) and indefinitely for severely disabled children.