Child Support Payment Calculator
ANA›Life Services Authority›National Calculator Authority›Child Support Payment 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 Payment Calculator
Estimate monthly child support obligations using the Income Shares Model, the most widely adopted method across U.S. states. Results are estimates only — consult a family law attorney for legal advice.
Non-Custodial Parent Gross Monthly Income ($)
Custodial Parent Gross Monthly Income ($)
Number of Children
NCP Monthly Healthcare Contribution ($)
NCP Monthly Childcare Contribution ($)
NCP Parenting Time (nights/year)
Calculate Child Support
### Estimated Monthly Child Support
Combined Gross Monthly Income— NCP Income Share (%)— Basic Child Support Obligation (BSO)— NCP Share of BSO— Healthcare & Childcare Add-ons— Parenting Time Adjustment— Estimated NCP Monthly Payment—
function chiCalc() { const errEl = document.getElementById('chi-error'); const resEl = document.getElementById('chi-result'); errEl.style.display = 'none'; resEl.style.display = 'none';
// --- Inputs --- const ncpIncome = parseFloat(document.getElementById('chi-ncp-income').value); const cpIncome = parseFloat(document.getElementById('chi-cp-income').value); const numChildren = parseInt(document.getElementById('chi-num-children').value); const ncpHealth = parseFloat(document.getElementById('chi-ncp-healthcare').value) || 0; const ncpChild = parseFloat(document.getElementById('chi-ncp-childcare').value) || 0; const visitation = parseFloat(document.getElementById('chi-visitation').value) || 0;
// --- Validation --- const errors = []; if (isNaN(ncpIncome) || ncpIncome 10) errors.push("Number of children cannot exceed 10."); if (ncpIncome === 0 && cpIncome === 0) errors.push("At least one parent must have income greater than zero."); if (visitation 365) errors.push("Parenting time must be between 0 and 365 nights/year.");
if (errors.length > 0) { errEl.innerHTML = errors.map(e => '⚠ ' + e).join(''); errEl.style.display = 'block'; return; }
// --- Step 1: Combined Income --- const combinedIncome = ncpIncome + cpIncome;
// --- Step 2: NCP Income Share --- const ncpSharePct = ncpIncome / combinedIncome;
// --- Step 3: Basic Support Obligation (BSO) using Income Shares Schedule --- // Approximation based on widely published combined income tables. // Percentages of combined income by number of children (standard schedule): // 1 child: 17%, 2: 25%, 3: 29%, 4: 31%, 5: 32%, 6+: 35% const childPct = [0, 0.17, 0.25, 0.29, 0.31, 0.32, 0.35]; const pct = numChildren 92 overnights/year (25%) // Reduction formula: adjustment = (visitation/365 - 0.25) * 2 * ncpBSO when visitation > 92 let visitationAdj = 0; const visitationFraction = visitation / 365; if (visitation > 92) { // Shared custody adjustment (common statutory formula) visitationAdj = (visitationFraction - 0.25) * 2 * ncpBSO; visitationAdj = Math.min(visitationAdj, ncpBSO * 0.50); // cap at 50% reduction }
// --- Step 7: Self-Support Reserve --- // NCP must retain at least $1,000/month; if ncpIncome '$' + v.toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ','); const pctFmt = v => (v * 100).toFixed(1) + '%';
- document.getElementById('chi-combined-income').textContent = fmt(combinedIncome);
- document.getElementById('chi-ncp-share').textContent = pctFmt(ncpSharePct);
- document.getElementById('chi-bso').textContent = fmt(bso);
- document.getElementById('chi-ncp-bso').textContent = fmt(ncpBSO);
- document.getElementById('chi-addons').textContent = fmt(ncpAddonShare);
- document.getElementById('chi-visitation-adj').textContent = visitation > 92
- ? '-' + fmt(visitationAdj) + ' (shared custody)'
- fmt(0) + ' (
#### Formula (Income Shares Model)
1. Combined Income = NCP Income + CP Income 2. NCP Income Share (%) = NCP Income ÷ Combined Income 3. Basic Support Obligation (BSO) = Combined Income × Child % Schedule Child % Schedule: 1 child=17%, 2=25%, 3=29%, 4=31%, 5=32%, 6+=35% 4. NCP Share of BSO = BSO × NCP Income Share % 5. Add-ons = NCP Healthcare + NCP Childcare Contributions 6. Parenting Time Adjustment (if NCP > 92 nights/year): Adjustment = (Nights/365 − 0.25) × 2 × NCP BSO (capped at 50%) 7. Final Payment = NCP BSO + Add-ons − Parenting Time Adjustment If NCP income < $1,000/month → minimum order = 10% of NCP income
#### Assumptions & References
- Uses the Income Shares Model adopted by ~40 U.S. states (NCSL, 2024).
- Parenting time adjustment threshold of 92 overnights/year (~25%) is the most common statutory trigger for shared-custody reduction.
- Self-support reserve of $1,000/month reflects typical state minimums to ensure NCP can meet basic needs.
- This calculator provides estimates only. Actual orders are set by a court. Consult a licensed family law attorney.
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