Project Payment Schedule Calculator

ANA›Life Services Authority›National Calculator Authority›Project Payment Schedule 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; } }

Project Payment Schedule Calculator

Generate a milestone-based payment schedule for your contracting project, including deposit, progress payments, and final payment amounts with due dates.

Total Project Value ($)

Deposit Percentage (%)

Final Payment Percentage (%)

Number of Progress Milestones (1–6)

Project Start Date

Total Project Duration (days)

Retainage Percentage (%) (held until completion)

Generate Payment Schedule

function proCalc() { var total = parseFloat(document.getElementById('pro_total').value); var depositPct = parseFloat(document.getElementById('pro_deposit_pct').value); var finalPct = parseFloat(document.getElementById('pro_final_pct').value); var milestones = parseInt(document.getElementById('pro_milestones').value); var startDateStr = document.getElementById('pro_start_date').value; var duration = parseInt(document.getElementById('pro_duration_days').value); var retainagePct = parseFloat(document.getElementById('pro_retainage_pct').value) || 0;

// --- Validation --- if (isNaN(total) || total Please enter a valid total project value greater than 0.'; return; } if (isNaN(depositPct) || depositPct 50) { document.getElementById('pro_result').innerHTML = 'Deposit percentage must be between 0% and 50%.'; return; } if (isNaN(finalPct) || finalPct 50) { document.getElementById('pro_result').innerHTML = 'Final payment percentage must be between 0% and 50%.'; return; } if ((depositPct + finalPct) >= 100) { document.getElementById('pro_result').innerHTML = 'Deposit + Final payment percentages must be less than 100%.'; return; } if (isNaN(milestones) || milestones 6) { document.getElementById('pro_result').innerHTML = 'Number of progress milestones must be between 1 and 6.'; return; } if (!startDateStr) { document.getElementById('pro_result').innerHTML = 'Please select a project start date.'; return; } if (isNaN(duration) || duration Project duration must be at least 1 day.'; return; } if (retainagePct 20) { document.getElementById('pro_result').innerHTML = 'Retainage percentage must be between 0% and 20%.'; return; }

// --- Core Calculations --- // Retainage is withheld from progress payments and released at final payment var retainageTotal = total * (retainagePct / 100);

// Deposit amount (paid upfront, no retainage withheld) var depositAmt = total * (depositPct / 100);

// Final payment amount (includes retainage release) var finalAmt = total * (finalPct / 100) + retainageTotal;

// Remaining balance split across progress milestones var progressTotal = total - depositAmt - (total * (finalPct / 100)); // Retainage is withheld from each progress payment var progressNet = progressTotal - retainageTotal; // net paid during progress var progressPerMilestone = progressNet / milestones; var retainagePerMilestone = retainageTotal / milestones;

// Date calculations // Deposit: on start date // Progress milestones: evenly spaced between start and end // Final: on end date var startDate = new Date(startDateStr + 'T00:00:00'); var endDate = new Date(startDate.getTime() + duration * 86400000);

function addDays(date, days) { return new Date(date.getTime() + days * 86400000); } function fmtDate(date) { return date.toLocaleDateString('en-US', {year:'numeric', month:'short', day:'numeric'}); } function fmtMoney(val) { return '$' + val.toLocaleString('en-US', {minimumFractionDigits:2, maximumFractionDigits:2}); }

// Build schedule rows var schedule = []; var runningTotal = 0;

// 1. Deposit schedule.push({ label: 'Deposit', date: startDate, gross: depositAmt, retainageHeld: 0, netPayment: depositAmt, note: 'Due on project start' }); runningTotal += depositAmt;

// 2. Progress milestones var intervalDays = duration / (milestones + 1); for (var i = 1; i '; html += ''; html += 'Milestone'; html += 'Due Date'; html += 'Gross Amount'; if (retainagePct > 0) { html += 'Retainage Held'; html += 'Net Payment'; } html += 'Note'; html += '';

var cumulative = 0;
for (var j = 0; j ';
html += '' + row.label + '';
html += '' + fmtDate(row.date) + '';
html += '' + fmtMoney(row.gross) + '';
if (retainagePct > 0) {
var retLabel = row.retainageHeld +' + fmtMoney(-row.retainageHeld) + ' released'
(row.retainageHeld > 0 ? '-' + fmtMoney(row.retainageHeld) + '' : '—'); html += '' + retLabel + ''; html += '' + fmtMoney(row.netPayment) + ''; } html += '' + row.note + ''; html += ''; } html += '';

// Summary cards html += ''; var cards = [ {label:'Total Contract Value', val: fmtMoney(total), color:'#2563eb'}, {label:'Total Deposit', val: fmtMoney(depositAmt) + ' (' + depositPct.toFixed(1) + '%)', color:'#7c3aed'}, {label:'Total Progress Payments', val: fmtMoney(progressNet), color:'#0891b2'}, {label:'Total Retainage Held', val: fmtMoney(retainageTotal) + ' (' + retainagePct.toFixed(1) + '%)', color:'#b45309'}, {label:'Final Payment (incl. retainage)', val: fmtMoney(finalAmt), color:'#059669'}, {label:'Project Duration', val: duration + ' days', color:'#374151'} ]; for (var k = 0; k '; html += '' + cards[k].label + ''; html += '' + cards[k].val + ''; html += ''; } html += '';

// Verification var diff = Math.abs(runningTotal - total); if (diff > 0.02) { html += '⚠ Schedule total (' + fmtMoney(runningTotal) + ') does not match contract value. Please review percentages.

'; } else { html += '✔ Schedule verified: all payments sum to ' + fmtMoney(total) + '.

'; }

document.getElementById('pro_result').innerHTML = html; }

#### Formulas Used

Deposit Amount = Total Contract Value × (Deposit % ÷ 100)

Retainage Total = Total Contract Value × (Retainage % ÷ 100)

Progress Pool = Total − Deposit − (Total × Final %) − Retainage Total

Net Payment per Milestone = Progress Pool ÷ Number of Milestones

Retainage Withheld per Milestone = Retainage Total ÷ Number of Milestones

Final Payment = (Total × Final %) + Retainage Total (retainage released)

Milestone Date = Start Date + Round(Duration × i ÷ (Milestones + 1)) days

Verification: Deposit + Σ(Net Progress Payments) + Final Payment = Total Contract Value

#### Assumptions & References

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References

Related Authorities

Life Services Authority › Professional Services Authority › Trade Services Authority › United States Authority ›