Child Support Arrears and Interest Calculator
ANA›Life Services Authority›National Calculator Authority›Child Support Arrears and Interest 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 Arrears and Interest Calculator
Calculate the total amount owed in child support arrears, including accrued interest, based on missed payments and your state's interest rate.
Court-Ordered Monthly Support Amount ($)
Number of Months Payments Were Missed
Total Amount Already Paid Toward Arrears ($)
Annual Interest Rate on Arrears (%)
Common rates: CA=10%, TX=6%, FL=12%, NY=9%. Check your state's law.
Number of Months Interest Has Been Accruing
Interest Compounding Method
Simple Interest (most states) Compound Interest (monthly)
Calculate Arrears & Interest
### Results
Total Missed Payments (Principal Arrears) Less: Payments Already Made Net Principal Arrears Accrued Interest Total Amount Owed
function chiCalc() { var errEl = document.getElementById('chi-error'); var resEl = document.getElementById('chi-result'); errEl.style.display = 'none'; resEl.style.display = 'none';
var monthlyOrder = parseFloat(document.getElementById('chi-monthly-order').value); var monthsMissed = parseFloat(document.getElementById('chi-months-missed').value); var partialPaid = parseFloat(document.getElementById('chi-partial-paid').value) || 0; var annualRate = parseFloat(document.getElementById('chi-interest-rate').value); var monthsAccruing = parseFloat(document.getElementById('chi-months-accruing').value); var compounding = document.getElementById('chi-compounding').value;
// --- Validation --- var errors = []; if (isNaN(monthlyOrder) || monthlyOrder 100) errors.push("Annual interest rate must be between 0% and 100%."); if (isNaN(monthsAccruing) || monthsAccruing grossPrincipal) errors.push("Amount already paid ($" + partialPaid.toFixed(2) + ") cannot exceed total missed payments ($" + grossPrincipal.toFixed(2) + ").");
if (errors.length > 0) { errEl.innerHTML = errors.map(function(e){ return '⚠ ' + e; }).join(''); errEl.style.display = 'block'; return; }
// --- Core Calculations --- // Principal arrears = (monthly order × months missed) − payments already made var netPrincipal = grossPrincipal - partialPaid;
// Monthly interest rate var monthlyRate = annualRate / 100 / 12;
var accruedInterest = 0; var breakdownNote = '';
if (compounding === 'simple') { // Simple interest: I = P × r_annual × (t_months / 12) accruedInterest = netPrincipal * (annualRate / 100) * (monthsAccruing / 12); breakdownNote = 'Simple interest formula: I = P × r × (t / 12) | ' + 'I = $' + netPrincipal.toFixed(2) + ' × ' + (annualRate/100).toFixed(4) + ' × (' + monthsAccruing + '/12)'; } else { // Compound interest (monthly): A = P × (1 + r/12)^t → I = A − P if (monthlyRate === 0) { accruedInterest = 0; } else { var compoundAmount = netPrincipal * Math.pow(1 + monthlyRate, monthsAccruing); accruedInterest = compoundAmount - netPrincipal; } breakdownNote = 'Compound interest formula: I = P × [(1 + r/12)' + monthsAccruing + ' − 1] | ' + 'I = $' + netPrincipal.toFixed(2) + ' × [(1 + ' + monthlyRate.toFixed(6) + ')' + monthsAccruing + ' − 1]'; }
var totalOwed = netPrincipal + accruedInterest;
// --- Display --- function fmt(n) { return '$' + n.toLocaleString('en-US', {minimumFractionDigits:2, maximumFractionDigits:2}); }
document.getElementById('chi-r-principal').textContent = fmt(grossPrincipal); document.getElementById('chi-r-paid').textContent = '− ' + fmt(partialPaid); document.getElementById('chi-r-net').textContent = fmt(netPrincipal); document.getElementById('chi-r-interest').textContent = fmt(accruedInterest); document.getElementById('chi-r-total').textContent = fmt(totalOwed); document.getElementById('chi-r-breakdown').innerHTML = breakdownNote;
resEl.style.display = 'block'; }
#### Formulas Used
Principal Arrears: Net Principal = (Monthly Order × Months Missed) − Payments Already Made
Simple Interest (most states): I = P × r × (t / 12) where P = net principal, r = annual interest rate (decimal), t = months accruing
Compound Interest (monthly, some states): I = P × [(1 + r/12)t − 1]
Total Owed = Net Principal + Accrued Interest
#### Assumptions & References
- Most U.S. states apply simple interest on child support arrears; a minority use compound interest.
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