Checklist · Family Law

Establishing, Modifying, and Enforcing Child Support: A Practical Checklist

42 U.S.C. § 667

Type
Checklist
Jurisdiction
National
Date
2026-03-26
Topic
Family Law

This checklist takes a parent or advocate through establishing, modifying, and enforcing a child support order. The first phase is the arithmetic: running the state guideline calculator with honest inputs, documenting income including the self-employment analysis that turns on bank records rather than tax returns, counting actual overnights from a calendar, and pricing the add-ons that move the number by hundreds of dollars. Establishment phases cover the state program route, the private action, and the ten provisions every order should contain, including the medical reimbursement clause with deadlines that prevents years of later litigation. The modification phase is the most important in the document because retroactivity generally begins at filing, making delay permanent. Enforcement phases cover opening a program case, the automatic collection tools, the arrears audit that frequently finds errors, and contempt preparation centered on ability to pay. Interstate, duration, and low-income phases close the practical sections.

Establishing, Modifying, and Enforcing Child Support: A Practical Checklist

Family Law > Child Support | Published 26 March 2026 - Updated 11 July 2026 | UpLaw - uplaw.us

⭐ If your income just changed, go to Phase 5 and file this week. Support generally cannot be modified retroactively before the filing date, and an informal agreement modifies nothing.

Use with Child Support: A Comprehensive Guide to Guidelines, Imputed Income, Modification, and Enforcement and The Child Support Calculation and Enforcement Toolkit.

Phase 1 — Run the numbers first

☐ ⭐ Find your state's guideline calculator and run it with honest inputs. It converts an argument into arithmetic and frequently ends the dispute. Guidelines are required by 42 U.S.C. § 667.

☐ Identify the model: income shares · percentage of income · a hybrid with a self-support reserve.

☐ Gather income for both parents:

  • ☐ Wages, salary, tips, commissions, bonuses, overtime
  • ☐ Self-employment net income
  • ☐ Rental, investment, dividends, capital gains
  • ☐ Pensions, annuities, retirement distributions
  • ☐ Social security, unemployment, workers compensation, disability, severance
  • ☐ ⭐ In-kind benefits reducing living expenses — employer vehicle, housing, meals
  • ☐ Regular family contributions or trust distributions, in some states

☐ ⭐ If either parent is self-employed, the tax return is the beginning:

  • ☐ Add back depreciation and other non-cash deductions where the state allows
  • ☐ Identify personal expenses run through the business — vehicle, phone, meals, travel, family on payroll
  • ☐ Examine retained earnings and distributions
  • ☐ Compare against bank deposits and lifestyle
  • ☐ ⭐ Obtain loan and credit applications — income is stated honestly when someone wants to borrow

☐ Price the add-ons — they are real money:

  • ☐ ⭐ The children's incremental health insurance premium — not the family premium; the employer can supply the figure
  • ☐ Work-related childcare
  • ☐ Extraordinary expenses

☐ ⭐ Count actual overnights over twelve months, from a calendar — not from the parenting plan. ⚠ Many guidelines contain a threshold that moves the number sharply.

Phase 2 — Establish the order

☐ ⭐ Establish parentage first where it is not established — see Establishing or Contesting Parentage: A Practical Checklist.

☐ Choose the route:

  • ☐ ⭐ The state program — 42 U.S.C. § 654 — free or nearly free, open to any parent, with location and enforcement included. ⚠ It represents the state, not you.
  • ☐ A private action, frequently within a divorce or custody case

☐ ⚠ If receiving public assistance, support rights are assigned to the state — 42 U.S.C. § 656 — with distribution under 42 U.S.C. § 657. ⭐ Ask how much passes through before expecting the payment.

☐ Request retroactive support to the filing date, and where available to separation or birth.

☐ ⭐ File promptly rather than negotiating first — the filing date anchors retroactivity.

Phase 3 — What the order must say

☐ Amount and payment schedule ☐ ⭐ Income withholding — automatic under 42 U.S.C. § 666 ☐ Payment through the state disbursement unit ☐ ⭐ Health insurance — who provides it, allocation of the children's portion, and a medical support notice to the employer ☐ ⭐ Unreimbursed medical expenses, with:

  • ☐ The percentage split
  • ☐ What counts — deductibles, copays, dental, orthodontia, vision, mental health, prescriptions
  • ☐ A deadline to present the bill (commonly 30 days)
  • ☐ A deadline to reimburse (commonly 30 days)
  • ☐ The consequence of missing either
  • ☐ Whether pre-approval is required for elective costs ☐ Work-related childcare and its allocation ☐ Extraordinary expenses — activities, private school, travel for parenting time ☐ Tax dependency allocation, and any condition ☐ ⭐ Life insurance securing the obligation — small premium, frequently omitted, irreplaceable later ☐ Duration and the emancipation event — including secondary school and any disabled adult child provision

☐ ⭐ The medical clause is the cheapest thing to get right and the most expensive thing to get wrong.

Phase 4 — Deviations and unusual cases

☐ ⭐ The guideline number is presumptive, not mandatory — a deviation requires written findings.

☐ Grounds worth raising:

  • ☐ Substantial shared parenting time not already credited
  • ☐ A child's extraordinary medical or educational needs
  • ☐ Extraordinary travel costs for parenting time
  • ☐ Support obligations for other children
  • ☐ A very high combined income, where the guideline extrapolates beyond the children's actual needs
  • ☐ A very low payor income, where the self-support reserve applies
  • ☐ A child's own income, in some states, for a working teenager or a child receiving benefits

☐ ⚠ Ask for findings on the record. ⭐ A deviation without findings is reversible; an unappealed deviation with findings is durable.

☐ If the payor receives disability benefits, ask whether the children's derivative benefit credits against the obligation — most states credit it, and the payment frequently exceeds the obligation.

Phase 5 — Modification (the phase that matters most)

☐ ⭐ File the motion the week the change happens. ⚠ Support generally cannot be modified retroactively before the filing date. A job lost in January and a motion filed in September usually means eight months of arrears at the old rate — permanently.

☐ ⚠ A private agreement to reduce support modifies nothing. ⭐ Arrears accrue under the order, not the understanding. Enter it as an order or it does not exist.

☐ Identify the standard:

  • ☐ A substantial and continuing change in circumstances
  • ☐ A percentage or dollar threshold between the current and recalculated amounts, in many states
  • ☐ Periodic review through the state program, available in most states every three years

☐ Document the change:

  • ☐ Termination letter, layoff notice, or reduction in hours
  • ☐ New pay records
  • ☐ Medical records where disability is claimed
  • ☐ ⭐ A job search log, where reduced income is alleged — the absence of one invites imputation

☐ ⚠ Voluntary unemployment or underemployment generally does not reduce support. ⭐ A payor who quits to attend school or take a lower-paying job usually keeps the old number.

☐ If the other parent's income rose, request discovery — pay records, tax returns, and business records where applicable.

☐ Request that the modification be effective from filing and that arrears be recalculated.

Phase 6 — Imputed income

☐ If arguing income should be imputed:

  • ☐ Establish voluntary unemployment or underemployment
  • ☐ Offer earning capacity evidence — recent earnings history, credentials, licenses, local wage data, ⭐ a vocational evaluation in larger cases
  • ☐ Offer evidence of available work in the relevant market
  • ☐ Point to lifestyle inconsistent with reported income

☐ If resisting imputation:

  • ☐ Show the job loss was involuntary — the termination letter matters
  • ☐ Show a genuine and documented job search
  • ☐ Show a medical limitation, with records rather than testimony
  • ☐ Show caregiving responsibilities for a young or disabled child
  • ☐ Show the reduction serves the children long-term — a training program with a documented earnings path
  • ☐ ⚠ Address incarceration directly: 45 C.F.R. Part 302 requires states to treat incarceration as involuntary rather than voluntary unemployment. ⭐ File the motion from custody.

Phase 7 — Enforcement

☐ ⭐ Open a state program case first — 42 U.S.C. § 654. It costs almost nothing and carries the automatic tools.

☐ Confirm income withholding is in place — 42 U.S.C. § 666. ⚠ Withholding is capped by 15 U.S.C. § 1673 at 50–65 percent of disposable earnings depending on second-family status and arrears age.

☐ The automatic tools:

  • ☐ Tax refund intercept, federal and state
  • ☐ Liens on real and personal property
  • ☐ Credit bureau reporting
  • ☐ ⭐ License suspension — driver, professional, recreational
  • ☐ Passport denial at the federal threshold
  • ☐ New hire directory matching, which locates a payor within weeks of a new job
  • ☐ Financial institution data match and account seizure
  • ☐ Lottery and insurance settlement intercept

☐ ⭐ Run an arrears audit before any enforcement hearing:

  • ☐ Obtain the complete payment history from the disbursement unit
  • ☐ Reconcile against the order and every modification
  • ☐ Check that direct payments were credited — ⚠ cash payments frequently were not
  • ☐ Check the interest calculation, where the state charges interest
  • ☐ Check whether derivative disability benefits were credited
  • ☐ ⭐ Errors are common in both directions and the audit is worth doing before either side commits to a position.

Phase 8 — Contempt

☐ Confirm the elements: a valid order · notice of it · non-payment · ability to pay.

☐ ⭐ Ability to pay is the whole case. ⚠ Incarcerating a parent who genuinely cannot pay is unconstitutional. Turner v. Rogers requires procedural safeguards, and Bearden v. Georgia, 461 U.S. 660, holds that a person cannot be imprisoned for non-payment without a finding of willfulness.

☐ If moving for contempt, prove ability:

  • ☐ Employment and pay records
  • ☐ Bank records and deposits
  • ☐ ⭐ Spending inconsistent with claimed inability — vehicles, travel, social media
  • ☐ Property transfers timed to the obligation

☐ If defending contempt, prove inability:

  • ☐ ⭐ A documented job search
  • ☐ Medical records
  • ☐ Bank records showing the money is not there
  • ☐ Evidence of what was paid, however partial — ⭐ partial payment is the strongest evidence of good faith
  • ☐ ⚠ Request counsel where incarceration is possible; Turner requires substitute safeguards where counsel is not appointed

☐ Ask about the purge condition — a civil contempt sentence must be purgeable by an amount the payor can actually pay.

Phase 9 — Interstate orders

☐ Identify the issuing state. ⭐ Under 28 U.S.C. § 1738B, only one order controls, and the issuing state generally keeps continuing exclusive jurisdiction while a party or the child remains there.

☐ To enforce across state lines: register the order in the responding state, or use the state program, which handles interstate cases routinely.

☐ ⚠ To modify across state lines, jurisdiction usually must have shifted — everyone has left the issuing state, or the parties consented in writing.

☐ ⭐ A second state's order entered without jurisdiction is void and creates years of reconciliation work. Check before filing.

☐ Apply the law of the issuing state to duration — the emancipation age travels with the order.

Phase 10 — Duration, termination, and arrears

☐ Confirm the emancipation event — age, secondary school completion, marriage, military service, or another statutory event.

☐ ⚠ Support does not always end automatically. ⭐ File the termination motion; do not simply stop paying.

☐ Check for a disabled adult child provision — many states extend support for a child who cannot be self-supporting.

☐ Check whether the order allocates college costs. ⚠ In many states a court cannot order it, but a written agreement is enforceable as contract.

☐ ⚠ Arrears survive emancipation. ⭐ They are generally not dischargeable in bankruptcy — 11 U.S.C. § 523 — and enforcement continues until paid.

☐ After emancipation, confirm withholding continues toward arrears at the arrears rate rather than stopping.

Phase 11 — Low income and the self-support reserve

☐ Check the state's self-support reserve and minimum order.

☐ ⭐ A realistic small order that is paid beats a large order that is not. ⚠ Uncollectible arrears with interest and license suspension push a payor out of the formal economy, which helps no one.

☐ Ask about arrears compromise programs — many states forgive state-owed arrears in exchange for consistent payment.

☐ Distinguish arrears owed to the state from arrears owed to the other parent — only the former can typically be compromised.

☐ If a license was suspended, ask about a payment-plan reinstatement. ⚠ A suspended license frequently eliminates the job that would generate the payment.

Phase 12 — Working with the state program

☐ Understand the relationship: ⭐ the program's client is the state, not you. It does not give legal advice and does not represent either parent.

☐ Provide everything requested promptly — the case moves at the speed of the file.

☐ Keep your address current. ⚠ Notices go to the address on file.

☐ Check the payment record online where the state offers it, monthly.

☐ Escalate through a supervisor and the state ombudsman where a case stalls.

☐ Retain private counsel for: contested self-employment income · imputation · interstate jurisdiction · deviation requests · contempt defense.

Common mistakes

⚠ Waiting to file the modification. The single most expensive error in this area. ⚠ Relying on a private agreement. It modifies nothing. ⚠ Paying in cash. Unprovable and frequently uncredited. ⚠ Using the family premium instead of the incremental children's premium. Distorts the calculation. ⚠ Counting parenting plan overnights instead of actual overnights. ⚠ Omitting the medical reimbursement deadline. Guarantees future litigation. ⚠ Omitting life insurance security. Costs nothing to add, impossible to add later. ⚠ Quitting a job to reduce support. Produces imputation, not relief. ⚠ Stopping payment at emancipation without an order. ⚠ Filing a modification in the wrong state. Produces a void order. ⚠ Withholding parenting time over non-payment, or non-payment over parenting time. ⭐ They are legally independent, and each is separately enforceable.

Worked example: the modification that waited

Marcus was laid off in February. His support order was $1,150 a month, set when he earned $78,000. He told his ex-wife by text, she said "do what you can," and he paid $400 a month from unemployment. He found new work in August at $52,000 and filed a modification in September. The court recalculated to $790 effective the September filing date.

The seven months at $1,150 stood. He had paid $2,800 against $8,050 owed, leaving $5,250 in arrears — plus statutory interest, plus a credit report entry, plus an income withholding order now running at the arrears rate on a smaller paycheck.

Had he filed in February, the modification would have been effective then. The order would have dropped during unemployment — most states allow a temporary order at or near the self-support reserve for a payor genuinely without income — and the entire arrears would not exist. ⭐ The text message was worth nothing. The filing fee was worth $5,250.

⚠ And the "do what you can" reply did not waive anything. In most states a support obligee cannot waive the children's right to support by informal agreement.

Worked example: the business owner's tax return

Danielle's ex-husband reported $41,000 in net self-employment income from his contracting business. The guideline produced $410 a month for their two children.

Discovery produced the business bank statements. Deposits totaled $312,000. The Schedule C showed $86,000 in vehicle, meals, travel, and "office" expenses, including a truck used primarily for family transportation, meals with no business counterparty identified, and a phone plan covering four lines for a household of four. Depreciation of $34,000 was claimed on equipment purchased three years earlier. His new spouse was on payroll at $28,000 for bookkeeping she performed roughly four hours a week.

⭐ The mortgage application he had submitted eleven months earlier stated monthly income of $9,400.

The court found income of $103,000 for support purposes. The order became $1,240 a month.

⭐ The lesson generalizes: for a self-employed payor, the tax return is a starting document, not a finishing one. Bank deposits, loan applications, and lifestyle are the real evidence.

Documents to gather

☐ The current support order and every modification ☐ Every parenting plan and any modification ☐ Complete payment history from the state disbursement unit ☐ Three years of tax returns, both parents, with all schedules and W-2s/1099s ☐ Recent pay records — six months minimum ☐ Employer statement of the incremental children's health premium ☐ Childcare invoices and provider statements ☐ Unreimbursed medical bills, with proof of presentation and any reimbursement ☐ Bank statements — personal and business ☐ Business records where self-employment is involved: profit and loss, general ledger, merchant statements ☐ ⭐ Loan and credit applications ☐ Termination or layoff documentation ☐ ⭐ A job search log ☐ Medical documentation of any claimed limitation ☐ A twelve-month overnight calendar ☐ Benefit award letters — disability, unemployment, workers compensation ☐ Any written agreement on college, extracurriculars, or extraordinary expenses

Authority quick reference

Authority What it does Where it bites
42 U.S.C. § 651 Creates the federal-state child support enforcement program Why every state has a program at all
42 U.S.C. § 653 Federal Parent Locator Service Finding a payor who moved
42 U.S.C. § 654 State plan requirements The services the program must offer you
42 U.S.C. § 655 Federal funding of the program Why the services are free or nearly so
42 U.S.C. § 656 Assignment of support rights Public assistance recipients
42 U.S.C. § 657 Distribution of collections How much actually reaches the household
42 U.S.C. § 664 Tax refund intercept The most reliable collection tool
42 U.S.C. § 666 Required state enforcement procedures Withholding, liens, licenses, new hire reporting
42 U.S.C. § 667 Guidelines and the rebuttable presumption Why deviation requires written findings
28 U.S.C. § 1738B Full Faith and Credit for Child Support Orders Act One controlling order; interstate modification
15 U.S.C. § 1673 Withholding limits The 50–65 percent ceiling
11 U.S.C. § 523 Discharge exceptions Support arrears survive bankruptcy
11 U.S.C. § 507 Priority claims Support sits at the front of the line
18 U.S.C. § 228 Federal criminal non-support Interstate, willful, large arrears only
45 C.F.R. Part 302 State plan regulations Incarceration is not voluntary unemployment
Turner v. Rogers, 564 U.S. 431 Civil contempt safeguards Ability to pay must be found
Bearden v. Georgia, 461 U.S. 660 No jailing for inability to pay The willfulness finding

Fifteen practice pointers

  1. ⭐ Run the calculator before the first conversation. It is public, it is free, and it usually ends the argument.
  2. File the modification the week the change occurs. Everything else in this checklist is negotiable; this is not.
  3. Get the incremental premium in writing from the employer, not from the payor's memory.
  4. Count overnights from a calendar, and keep the calendar.
  5. Put a presentation deadline and a reimbursement deadline in the medical clause.
  6. Add life insurance security. Term coverage on a support obligor is inexpensive and disappears the moment it is needed.
  7. Never pay support in cash. If you already did, reconstruct with bank withdrawals and any acknowledgment.
  8. Ask for findings on any deviation.
  9. Keep a job search log from day one of any unemployment.
  10. Pay something every month, even a small amount. It is the difference between a contempt finding and a payment plan.
  11. Order the arrears audit before the hearing, not after.
  12. Check whether derivative disability benefits were credited. They frequently were not.
  13. Confirm the controlling order before filing anywhere.
  14. File a termination motion at emancipation. Do not just stop.
  15. ⭐ Keep parenting time and support in separate boxes. Mixing them loses both.

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