Child Support Estimate Calculator
ANA›Life Services Authority›National Calculator Authority›Child Support Estimate Calculator
.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }
Child Support Estimate Calculator
Estimate monthly child support obligations using the widely adopted Income Shares Model, which bases support on both parents' combined income and the number of children.
Non-Custodial Parent Gross Monthly Income ($)
Custodial Parent Gross Monthly Income ($)
Number of Children
-- Select -- 1 2 3 4 5 6+
Non-Custodial Parent Parenting Days per Year
Monthly Childcare / Work-Related Costs ($)
Monthly Health Insurance Premium for Children ($)
Calculate Child Support
function chiCalc() { // --- Grab inputs --- const ncpIncome = parseFloat(document.getElementById('chi-ncp-income').value); const cpIncome = parseFloat(document.getElementById('chi-cp-income').value); const numChildrenRaw = document.getElementById('chi-num-children').value; const parentingDays = parseFloat(document.getElementById('chi-ncp-parenting-days').value); const childcareCost = parseFloat(document.getElementById('chi-childcare-cost').value) || 0; const healthIns = parseFloat(document.getElementById('chi-health-insurance').value) || 0;
// --- Validation --- const errors = []; if (isNaN(ncpIncome) || ncpIncome 365) errors.push("Parenting days must be between 0 and 365."); if (ncpIncome === 0 && cpIncome === 0) errors.push("At least one parent must have income greater than zero.");
const resultDiv = document.getElementById('chi-result'); if (errors.length > 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = 'Please fix the following:' + errors.map(e => '').join('') + ''; return; }
const numChildren = parseInt(numChildrenRaw);
// --- Income Shares Model --- // Step 1: Combined Adjusted Gross Income (CAGI) const cagi = ncpIncome + cpIncome;
// Step 2: Basic Child Support Obligation (BCSO) lookup table // Based on generalised Income Shares schedule (per month, USD) // Rows: combined income brackets; Cols: 1–6 children // Source: Derived from USDHHS Income Shares guidelines (representative schedule) const incomeTable = [ [800, [202, 284, 322, 354, 382, 406]], [1000, [253, 355, 403, 443, 478, 508]], [1200, [304, 426, 484, 532, 574, 610]], [1500, [380, 533, 605, 665, 717, 762]], [2000, [507, 711, 807, 887, 957, 1017]], [2500, [634, 889, 1009, 1109, 1196, 1271]], [3000, [761, 1067, 1211, 1331, 1435, 1525]], [3500, [888, 1245, 1413, 1553, 1674, 1779]], [4000, [1015, 1423, 1615, 1775, 1913, 2033]], [4500, [1142, 1601, 1817, 1997, 2152, 2287]], [5000, [1269, 1779, 2019, 2219, 2391, 2541]], [6000, [1523, 2135, 2423, 2663, 2869, 3049]], [7000, [1777, 2491, 2827, 3107, 3347, 3557]], [8000, [2031, 2847, 3231, 3551, 3825, 4065]], [9000, [2285, 3203, 3635, 3995, 4303, 4573]], [10000, [2539, 3559, 4039, 4439, 4781, 5081]], [12000, [3047, 4271, 4847, 5327, 5737, 6097]], [15000, [3809, 5339, 6059, 6659, 7171, 7621]], [20000, [5079, 7119, 8079, 8879, 9561, 10161]], ];
// Interpolate BCSO from table function getBCSO(income, children) { const idx = Math.min(children, 6) - 1; if (income 0 ? ncpIncome / cagi : 0;
// Step 5: NCP's Preliminary Support Obligation const ncpPreliminary = tso * ncpShare;
// Step 6: Parenting-time adjustment (shared custody credit) // Standard threshold: if NCP has >= 92 overnights (25.2%) apply shared-custody formula // Credit = (ncpDaysFraction - 0.20) * 1.5 * tso when days > 73 (20%) const ncpDaysFraction = parentingDays / 365; let parentingCredit = 0; if (parentingDays >= 73) { // Shared parenting adjustment: credit proportional to extra time above 20% parentingCredit = (ncpDaysFraction - 0.20) * 1.5 * tso; parentingCredit = Math.max(0, parentingCredit); }
// Step 7: Final NCP Monthly Obligation let finalObligation = ncpPreliminary - parentingCredit; finalObligation = Math.max(0, finalObligation);
// Step 8: Effective percentage of NCP income const pctOfNcpIncome = ncpIncome > 0 ? (finalObligation / ncpIncome) * 100 : 0;
// --- Format helpers --- const fmt = v => '$' + v.toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ','); const fmtp = v => v.toFixed(1) + '%';
// --- Output --- resultDiv.style.display = 'block'; resultDiv.innerHTML = ` ### 💼 Child Support Estimate
Combined Adjusted Gross Income (CAGI)${fmt(cagi)}/mo Basic Child Support Obligation (BCSO)${fmt(bcso)}/mo + Childcare Costs${fmt(childcareCost)}/mo + Health Insurance Premium${fmt(healthIns)}/mo Total Support Obligation (TSO)${fmt(tso)}/mo NCP Income Share${fmtp(ncpShare * 100)} NCP Preliminary Obligation${fmt(ncpPreliminary)}/mo Parenting-Time Credit- ${fmt(parentingCredit)}/mo Estimated NCP Monthly Obligation${fmt(finalObligation)}/mo As % of NCP Gross Income${fmtp(pctOfNcpIncome)}
⚠️ This is an estimate only. Actual court-ordered support varies by state, judge discretion, and individual circumstances. Consult a family law attorney.
`; }
#### Formula & Methodology
This calculator uses the Income Shares Model — the standard adopted by most U.S. states:
- CAGI = NCP Gross Monthly Income + CP Gross Monthly Income
- BCSO = Interpolated from the Income Shares schedule table based on CAGI and number of children
- TSO = BCSO + Monthly Childcare Costs + Health Insurance Premium
- NCP Income Share = NCP Income ÷ CAGI
- NCP Preliminary Obligation = TSO × NCP Income Share
- Parenting-Time Credit (if NCP parenting days ≥ 73/year): Credit = (NCP Day Fraction − 0.20) × 1.5 × TSO
- Final NCP Obligation = NCP Preliminary Obligation − Parenting-Time Credit (minimum $0)
#### Assumptions & References
- Uses a representative Income Shares schedule derived from USDHHS guidelines; actual state schedules vary.
- Parenting-time credit applies when the non-custodial parent has 73 or more overnights per year (≥20%).
- Reference: U.S. Dept. of Health & Human Services, Office of Child Support Services — Essentials for Attorneys in Child Support Enforcement (2023).
- Reference: Williams, R. (1987). Guidelines for Setting Levels of Child Support Orders. Family Law Quarterly.
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