Toolkit · Family Law

The Child Support Calculation and Enforcement Toolkit

42 U.S.C. § 666

Type
Toolkit
Jurisdiction
National
Date
2025-10-25
Topic
Family Law

This toolkit supplies the working documents for a child support matter from first calculation through enforcement. It opens with an income and guideline worksheet, a self-employment add-back schedule that converts a tax return into support income, and an overnight tally sheet. It then provides drafting language for the ten provisions an order should contain, including a medical reimbursement clause with the deadlines that prevent later litigation. The modification section supplies a motion outline, a change-in-circumstances declaration, and a job search log. The enforcement section supplies an arrears audit worksheet, a demand letter, a contempt affidavit, and an ability-to-pay statement for the defense. Interstate registration, license reinstatement, arrears compromise, and emancipation termination each get a short packet. Every template is built to be adapted to state forms rather than filed as written.

The Child Support Calculation and Enforcement Toolkit

Family Law > Child Support | Published 25 October 2025 - Updated 16 August 2026 | UpLaw - uplaw.us

⚠ These are drafting aids, not forms. Every state has its own guideline worksheet, its own motion caption, and its own local rules. Adapt, then check the state's own forms — most states publish them free.

Companion documents: Establishing, Modifying, and Enforcing Child Support: A Practical Checklist · Child Support: A Comprehensive Guide to Guidelines, Imputed Income, Modification, and Enforcement · The Number the Guidelines Produce: How Child Support Is Actually Calculated and Changed

Tool 1 — Income worksheet

Complete for both parents. Use gross monthly figures unless the state directs otherwise.

Income source Parent A Parent B Source document
Wages, salary Pay records, W-2
Overtime (averaged 12 months) Pay records
Bonuses / commissions (averaged) Pay records, employer letter
Tips Pay records, declared tips
Self-employment net (see Tool 2) Schedule C, K-1, bank records
Rental income Schedule E, leases
Interest and dividends 1099s
Capital gains (recurring) Schedule D
Pension / retirement distributions 1099-R
Social Security (non-SSI) Award letter
Unemployment Benefit statement
Workers compensation Award letter
Disability (private or public) Award letter
Severance Separation agreement
Military allowances (BAH/BAS) LES
In-kind benefits reducing living costs Employer statement
Gross monthly income

Adjustments (state-dependent):

Adjustment Parent A Parent B
Support paid for other children under order
Support for other children in the home
Spousal support paid / received
Mandatory retirement contributions
Union dues
Adjusted gross monthly income

⚠ Do not deduct voluntary retirement contributions, debt payments, or a new spouse's expenses. They are almost never allowed.

Tool 2 — Self-employment add-back schedule

⭐ This is the single highest-value worksheet in the toolkit. Start from the tax return; end somewhere else.

Line Amount Basis for add-back
Reported Schedule C / K-1 net income Starting point
+ Depreciation and § 179 expensing Non-cash; most states add back
+ Amortization Non-cash
+ Home office deduction Expense the household would bear anyway
+ Vehicle expense (personal-use portion) Mileage log or absence of one
+ Meals and entertainment No business counterparty identified
+ Travel with a personal component Itinerary, companions
+ Phone / internet (household portion) Number of lines vs. household size
+ Wages to family members above market Hours worked vs. compensation
+ Personal insurance run through the business Policy documents
+ Retained earnings under the payor's control Balance sheet, distributions history
+ Owner draws not reflected in net income General ledger
= Support income

Cross-checks that decide the case:

☐ Total business bank deposits for the year: ____________ ☐ Total personal bank deposits for the year: ____________ ☐ ⭐ Income stated on the most recent loan or credit application: ____________ ☐ Rent or mortgage plus documented monthly spending: ____________

⭐ If deposits and lifestyle exceed reported income by a wide margin, the tax return is not the answer and the court will say so.

Tool 3 — Overnight tally sheet

⚠ Count what happened, not what the plan says. Many guidelines shift sharply at a threshold — commonly 92, 110, or 128 overnights.

Month Parent A overnights Parent B overnights Notes (holidays, makeups, cancellations)
January
February
March
April
May
June
July
August
September
October
November
December
Total Must sum to 365

☐ Define "overnight" as the state defines it — usually where the child sleeps. ☐ ⭐ Keep the underlying calendar, texts, or exchange log. The tally is only as good as its source.

Tool 4 — Guideline computation sheet (income shares model)

Step Computation Result
1 Parent A adjusted gross monthly income
2 Parent B adjusted gross monthly income
3 Combined income (1 + 2)
4 Parent A share (1 ÷ 3) ____ %
5 Parent B share (2 ÷ 3) ____ %
6 Basic obligation from the state table at line 3, for ___ children
7 + Children's incremental health insurance premium
8 + Work-related childcare
9 + Extraordinary expenses
10 Total obligation (6 + 7 + 8 + 9)
11 Payor's share (10 × payor's percentage)
12 − Credit for add-ons the payor pays directly
13 ± Parenting time adjustment
14 Presumptive support order

⭐ Run this three ways: your figures, their figures, and the midpoint. The spread tells you what is actually in dispute.

Tool 5 — Order provisions (drafting language)

Adapt to state form and local practice.

Amount and payment.

Beginning [date], [Payor] shall pay child support of $______ per month, payable [semi-monthly/monthly] through the [State] Disbursement Unit, by income withholding.

Income withholding.

An income withholding order shall issue immediately to [Payor]'s employer pursuant to 42 U.S.C. § 666 and applicable state law. [Payor] shall notify the court and [Obligee] in writing within ten days of any change in employment, employer address, or health insurance availability.

Health insurance.

[Party] shall maintain health, dental, and vision insurance for the minor children so long as it is available at reasonable cost through employment. A National Medical Support Notice shall issue to the employer. The children's incremental premium of $______ per month is included in the guideline calculation and allocated ____ percent to [Payor] and ____ percent to [Obligee].

Unreimbursed medical — the clause worth the most.

Unreimbursed medical, dental, orthodontic, vision, mental health, and prescription expenses for the minor children shall be divided ____ percent to [Payor] and ____ percent to [Obligee]. The party incurring the expense shall provide the other with the bill and proof of payment within thirty days of receipt. The other party shall reimburse within thirty days of receipt of that documentation. A party who fails to present an expense within ninety days waives contribution to it. A party who fails to reimburse within thirty days is subject to enforcement, including an award of fees. Non-emergency elective expenses exceeding $______ require written agreement in advance, not to be unreasonably withheld.

Childcare.

Work-related childcare of $______ per month is included in the calculation. Either party shall notify the other within fourteen days of any change exceeding $______ per month, and the support amount shall be recalculated upon motion.

Tax dependency.

[Obligee] shall claim the minor children as dependents for federal and state income tax purposes, except that [Payor] shall claim [child] for tax years in which [Payor] is current in support obligations as of December 31. [Obligee] shall execute IRS Form 8332 upon written request when the condition is satisfied.

Life insurance.

[Payor] shall maintain life insurance of not less than $______ naming the minor children, or a trustee for their benefit, as irrevocable beneficiaries so long as a support obligation continues, and shall provide annual proof of coverage upon written request.

Duration.

Support for each child shall continue until that child reaches age ____, or graduates from secondary school, whichever occurs later, but not beyond age ____, or until earlier emancipation by marriage, military service, or order of this Court. Support shall be recalculated upon the emancipation of each child on motion of either party.

Address and contact.

Each party shall keep the court and the state agency informed of current residential address, mailing address, telephone number, employer name and address, and driver's license number, as required by 42 U.S.C. § 666.

Tool 6 — Motion to modify (outline and language)

⭐ File it the week the change happens. Retroactivity generally runs from filing.

Caption. [Court] · [Case number] · In re the Marriage of / In the Interest of ______

Body.

  1. This Court entered a child support order on [date] requiring [Payor] to pay $______ per month for the parties' ____ minor children.
  2. Since entry of that order, circumstances have changed substantially and continuously in that: [state the change with dates and amounts].
  3. Applying the [State] child support guidelines to current circumstances produces a presumptive obligation of $______ per month, a change of ____ percent from the existing order. A completed guideline worksheet is attached as Exhibit A.
  4. This change meets the threshold for modification under [state statute].
  5. [Movant] requests that support be modified effective the date of filing of this motion, that arrears be recalculated accordingly, and that an amended income withholding order issue.

Attachments: guideline worksheet · income documentation · proof of the change · proposed order.

Declaration of changed circumstances.

I was employed by ______ as a ______ earning $______ per month. On [date] my employment ended. The reason was [layoff / plant closure / termination without cause / medical]. A copy of the [termination letter / layoff notice] is attached. Since that date I have applied for ____ positions, documented in the attached log. I began receiving unemployment of $______ per week on [date]. I have no other source of income. I have paid $______ toward support since the change.

⚠ If the reduction is voluntary, say why it serves the children long-term and document the earnings path. Otherwise expect imputation.

Tool 7 — Job search log

Keep it from day one. ⭐ Its absence is evidence; its presence is a defense.

Date Employer Position How applied Contact Outcome

☐ Aim for the number the state or court expects — commonly two to five per week. ☐ Include registration with the state workforce agency. ☐ Include applications outside your prior field where your field has contracted. ☐ Keep confirmation emails.

Tool 8 — Arrears audit worksheet

⭐ Run this before any enforcement hearing, on either side. Errors are common in both directions.

Period Order amount/mo Months Amount due Amount paid (SDU) Direct payments claimed Credits (derivative benefits, overpayment) Balance

☐ Obtain the complete SDU payment history. ☐ List every order and modification with effective dates. ☐ Identify direct payments and whether they were credited. ⚠ Cash payments usually were not. ☐ Identify derivative Social Security or veterans benefits paid to the children. Most states credit these; many agencies do not apply the credit automatically. ☐ Check the interest computation against the state rate and accrual rule. ☐ Check for duplicate withholding where two employers received the order. ☐ Check that emancipation reduced or ended the current obligation on the right date. ☐ Request a formal agency audit in writing and keep the response.

Tool 9 — Demand letter before enforcement

Dear ______:

Under the order entered [date] in [case number], child support of $______ per month is due. As of [date], the balance owed is $______, computed on the attached schedule. Payments received are credited on that schedule; if you believe a payment is missing, send proof of payment and I will correct it.

Please bring the account current, or contact me within fourteen days to arrange a payment schedule that I will submit to the court as an agreed order.

If I do not hear from you, I will file for enforcement, which may include a judgment for arrears, income withholding, tax refund intercept under 42 U.S.C. § 664, license suspension, credit reporting, and contempt.

Sincerely,

⭐ Send it. It resolves a meaningful share of cases, it costs one stamp, and it makes you look reasonable at the hearing that follows.

Tool 10 — Contempt affidavit (moving party)

  1. On [date] this Court ordered [Respondent] to pay child support of $______ per month.
  2. [Respondent] had notice of the order, having [appeared / been served / signed the agreement].
  3. Since [date], [Respondent] has paid $______ of the $______ due, leaving $______ unpaid. The payment history is attached as Exhibit A.
  4. [Respondent] has had the ability to pay during this period, in that: [employment at ______ earning $______ (Exhibit B); bank deposits totaling $______ (Exhibit C); purchase of ______ on [date] (Exhibit D); posts describing ______ (Exhibit E)].
  5. [Respondent]'s failure to pay has been willful.
  6. Movant requests a finding of contempt, judgment for arrears, an award of fees, and such coercive sanction as the Court finds appropriate, with a purge amount within [Respondent]'s ability to pay.

⚠ Paragraph 4 is the case. ⭐ Without evidence of ability, the motion fails under Bearden v. Georgia, 461 U.S. 660.

Tool 11 — Ability-to-pay statement (defense)

  1. I do not dispute the amount of the order or that I have not paid it in full.
  2. My gross monthly income is $, from [source]. My net is $.
  3. My necessary monthly expenses are: rent $______ · utilities $______ · food $______ · transportation $______ · medical $______ · other court-ordered support $______. Documentation attached.
  4. My total assets are: [list]. I have $______ in accounts, attached.
  5. I have paid $______ since [date], which is what I have been able to pay.
  6. [If unemployed] I lost my position on [date] for reasons outside my control. I have applied for ____ positions since, logged at Exhibit ____.
  7. [If disabled] I am unable to work because ______, as documented at Exhibit ____.
  8. I request that the Court find I lack the present ability to pay the full amount, set a payment plan I can meet, and [if applicable] modify the order prospectively.

⚠ Request appointed counsel where incarceration is possible. Turner v. Rogers, 564 U.S. 431, requires substitute procedural safeguards where counsel is not appointed — notice that ability to pay is the critical issue, a form to elicit financial information, an opportunity to respond, and an express finding.

Tool 12 — Interstate registration packet

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

☐ Certified copy of the order and every modification ☐ Sworn statement of arrears, with the payment history ☐ Registration statement naming: the obligor's address, employer, Social Security number if known, and any property in the responding state ☐ Statement of the controlling order under the state's version of the Uniform Interstate Family Support Act ☐ Notice to the obligor, with the deadline to contest registration — commonly twenty to thirty days ☐ ⚠ Grounds to contest registration are narrow — lack of jurisdiction over the obligor, the order was obtained by fraud, the order was stayed or vacated, a defense such as payment, or the wrong amount of arrears ☐ ⭐ Do not file a modification in the new state without confirming jurisdiction shifted. An order entered without jurisdiction is void and creates years of reconciliation work.

Simpler alternative: ask the state program to transmit the case. Interstate enforcement is routine work for the agencies under 42 U.S.C. § 654, and the Federal Parent Locator Service under 42 U.S.C. § 653 finds most payors within weeks through new-hire reporting.

Tool 13 — License reinstatement and hardship request

I request reinstatement of my [driver's / professional / recreational] license, suspended for child support arrears in case ______.

My license is required for my employment as ______ at ______, verified by the attached employer letter. Without it I cannot work, and without work I cannot pay support.

I propose a payment plan of $______ per month toward current support and $______ per month toward arrears, beginning [date], by automatic income withholding. I have attached [pay records / benefit statements / a budget].

I request reinstatement conditioned on compliance with that plan.

⚠ ⭐ A suspended license frequently eliminates the job that would generate the payment. Say that plainly, with the employer letter attached — agencies have discretion and use it.

Tool 14 — Arrears compromise request

Many states forgive state-owed arrears — the portion assigned under 42 U.S.C. § 656 while the family received assistance — in exchange for consistent payment. Arrears owed to the other parent generally cannot be compromised without that parent's agreement.

I request compromise of state-owed arrears in case , currently $.

My monthly income is $. My current support obligation is $, which I have paid in full for the last ____ months. The arrears accrued between [dates] when I was [unemployed / incarcerated / disabled].

I propose paying $______ per month toward current support plus $______ toward arrears for ____ months, in exchange for compromise of $______ in state-owed arrears at the conclusion of that period.

☐ Identify the state-owed portion separately from the family-owed portion — the agency can supply the split. ☐ ⭐ Establish a payment record first. Compromise programs reward demonstrated compliance, not promises.

Tool 15 — Emancipation and termination motion

⚠ Support does not always end automatically. Do not simply stop paying.

  1. The parties' child ______ was born [date] and [reached age ____ on (date) / graduated from secondary school on (date) / married on (date) / entered military service on (date)].
  2. Under the order of [date] and [state statute], support for that child terminates upon that event.
  3. Support for the remaining ____ children should be recalculated under the guidelines, producing $______ per month; a worksheet is attached.
  4. Movant requests an order terminating support for , modifying support to $ effective [date], and amending the income withholding order accordingly.
  5. [If arrears exist] Arrears of $______ remain and enforcement should continue at $______ per month.

☐ ⚠ Arrears survive emancipation and are generally non-dischargeable under 11 U.S.C. § 523, with priority under 11 U.S.C. § 507. ☐ Check for a disabled adult child provision before assuming termination.

Tool 16 — Document request list

Serve or gather these. ⭐ Items 8 through 11 decide self-employment cases.

  1. Federal and state tax returns, three years, all schedules and attachments
  2. W-2s, 1099s, K-1s, three years
  3. Pay records, twelve months
  4. Employer statement of health insurance options and the incremental children's premium
  5. Benefit award letters — disability, unemployment, workers compensation, retirement
  6. Bank statements, personal, twenty-four months
  7. Childcare invoices and provider statements
  8. Business bank statements and merchant processor statements, twenty-four months
  9. Profit and loss statements and general ledger, three years
  10. Loan applications, credit applications, and financial statements, three years
  11. Depreciation schedules and asset purchase documents
  12. Documentation of any other support obligation
  13. Retirement and brokerage statements
  14. Records of any transfer of assets in the last three years

Tool 17 — Negotiation script

Use before filing, or at the courthouse.

"Here's the state calculator, and here's what it produces on the numbers I have. If any of my inputs are wrong, tell me which one and show me, and I'll rerun it. If the number changes, I'll accept the new number.

On the medical clause, I want a thirty-day window to send bills and a thirty-day window to reimburse, both ways. That's not a position, it's just how we avoid being back here.

On insurance — a term policy on the obligation costs almost nothing while you're insurable and can't be bought once anything changes. I'd like it in the order.

If your income changes, file. Don't call me, file. I'll agree to the recalculation the same week."

⭐ Almost every contested support case is really a dispute about an input, not about the law. Putting the calculator on the table converts the argument into arithmetic.

Tool 18 — State program intake sheet

Bring or upload for a case under 42 U.S.C. § 654:

☐ Your identification and the children's birth certificates ☐ Any existing order and modifications ☐ The other parent's full name, date of birth, last known address, and Social Security number if known ☐ Employer name and address, if known ☐ Any acknowledgment of parentage or genetic test results ☐ Payment records for any direct payments ☐ Public assistance case number, if any ☐ Your current address, phone, and email — ⚠ and update them; notices go to the address on file

⚠ The program represents the state. ⭐ It will establish, locate, and enforce; it will not give you legal advice, and it does not represent either parent. For contested self-employment income, imputation, deviation, interstate jurisdiction, or contempt defense, retain counsel.

Tool 19 — Authority reference

Authority Use it for
42 U.S.C. § 651 The federal-state enforcement program exists
42 U.S.C. § 653 Locating a payor through the Federal Parent Locator Service
42 U.S.C. § 654 The services the state program must provide
42 U.S.C. § 655 Federal funding — why services cost almost nothing
42 U.S.C. § 656 Assignment of support rights during public assistance
42 U.S.C. § 657 Distribution — how much reaches the household
42 U.S.C. § 664 Tax refund intercept
42 U.S.C. § 666 Withholding, liens, license suspension, new-hire matching
42 U.S.C. § 667 Guidelines and the rebuttable presumption
28 U.S.C. § 1738B One controlling order; interstate jurisdiction
15 U.S.C. § 1673 The withholding ceiling
11 U.S.C. § 523 Arrears are not discharged
11 U.S.C. § 507 Support has priority in bankruptcy
18 U.S.C. § 228 Federal criminal non-support, rarely charged
45 C.F.R. Part 302 Incarceration is not voluntary unemployment
Turner v. Rogers, 564 U.S. 431 Contempt safeguards where counsel is not appointed
Bearden v. Georgia, 461 U.S. 660 No incarceration without a willfulness finding

⚠ Everything above is federal scaffolding. ⭐ The guideline table, the modification threshold, the emancipation age, the interest rate, and the deviation factors are all state law. Read the state statute alongside these.

Tool 20 — Where support intersects other matters

If this is also happening Read
A protective order is in place Obtaining or Responding to a Protective Order: A Practical Checklist and The Domestic Violence and Protective Order Toolkit — address supervised exchange and confidential addresses in the support order
The payor is filing bankruptcy Consumer Bankruptcy: A Comprehensive Guide to Chapter 7, Chapter 13, Exemptions, and Discharge — support is neither discharged nor stayed
Wages were not paid at all Documenting and Pursuing an Unpaid Wage Claim: A Practical Checklist
A payor is disabled Filing and Appealing a Social Security Disability Claim: A Practical Checklist — and ask about the children's derivative benefit
A payor is a veteran The Veterans Benefits Claim and Appeal Toolkit
Household benefits are affected Applying for Benefits and Appealing a Denial, Reduction, or Overpayment: A Practical Checklist
A collector is calling about the arrears The Consumer Debt and Credit Reporting Toolkit — support arrears reported to the bureaus are still subject to accuracy rules
Housing is at risk Defending an Eviction and Enforcing a Tenant's Rights: A Practical Checklist
A refund was intercepted The Individual Tax Controversy Toolkit — injured spouse relief protects a new spouse's share

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