National Insurance Contributions Calculator
ANA›Life Services Authority›National Calculator Authority›National Insurance Contributions 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; } }
National Insurance Contributions Calculator
Calculate your UK National Insurance Contributions (NICs) for the 2024/25 tax year based on employment income or self-employment profits.
Annual Employment Income (£)
Annual Self-Employment Profit (£)
Include Employer NICs?
Yes No
Calculate
function natCalc() { var empIncome = parseFloat(document.getElementById('nat-employment-income').value) || 0; var selfProfit = parseFloat(document.getElementById('nat-self-employment-profit').value) || 0; var includeEmployer = document.getElementById('nat-employer-calc').value === 'yes';
if (empIncome Error: Income values cannot be negative.'; return; } if (empIncome === 0 && selfProfit === 0) { document.getElementById('nat-result').style.display = 'block'; document.getElementById('nat-result').innerHTML = 'Error: Please enter at least one income value.'; return; }
// 2024/25 thresholds and rates var primaryThreshold = 12570; // Lower Profits Limit / Primary Threshold var upperEarningsLimit = 50270; // Upper Earnings Limit (UEL) var secondaryThreshold = 9100; // Employer secondary threshold var smallProfitsThreshold = 6725; // Class 2 small profits threshold
// Employee Class 1 NICs rates var class1Rate1 = 0.08; // 8% between PT and UEL var class1Rate2 = 0.02; // 2% above UEL
// Employer Class 1 NICs rate var employerRate = 0.138; // 13.8% above secondary threshold
// Class 4 NICs (self-employed) rates var class4Rate1 = 0.06; // 6% between LPL and UEL var class4Rate2 = 0.02; // 2% above UEL
// Class 2 NICs (self-employed) - flat rate var class2WeeklyRate = 3.45; // £3.45/week var class2Annual = class2WeeklyRate * 52; // £179.40/year
// --- Employee Class 1 NICs --- var employeeNIC = 0; if (empIncome > primaryThreshold) { var band1 = Math.min(empIncome, upperEarningsLimit) - primaryThreshold; var band2 = Math.max(0, empIncome - upperEarningsLimit); employeeNIC = (band1 * class1Rate1) + (band2 * class1Rate2); }
// --- Employer Class 1 NICs --- var employerNIC = 0; if (includeEmployer && empIncome > secondaryThreshold) { employerNIC = (empIncome - secondaryThreshold) * employerRate; }
// --- Class 2 NICs (self-employed) --- var class2NIC = 0; if (selfProfit > smallProfitsThreshold) { class2NIC = class2Annual; }
// --- Class 4 NICs (self-employed) --- var class4NIC = 0; if (selfProfit > primaryThreshold) { var c4band1 = Math.min(selfProfit, upperEarningsLimit) - primaryThreshold; var c4band2 = Math.max(0, selfProfit - upperEarningsLimit); class4NIC = (c4band1 * class4Rate1) + (c4band2 * class4Rate2); }
var totalEmployeeNIC = employeeNIC + class2NIC + class4NIC; var totalNIC = totalEmployeeNIC + employerNIC;
var fmt = function(n) { return '£' + n.toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ','); };
var html = '### National Insurance Contributions Breakdown '; html += ''; html += 'CategoryAnnual Amount';
if (empIncome > 0) { html += 'Employee Class 1 NICs' + fmt(employeeNIC) + ''; if (includeEmployer) { html += 'Employer Class 1 NICs (13.8%)' + fmt(employerNIC) + ''; } } if (selfProfit > 0) { html += 'Class 2 NICs (Self-Employed)' + fmt(class2NIC) + ''; html += 'Class 4 NICs (Self-Employed)' + fmt(class4NIC) + ''; }
html += 'Your Total NICs (Employee/Self-Employed)' + fmt(totalEmployeeNIC) + ''; if (includeEmployer && empIncome > 0) { html += 'Grand Total (incl. Employer NICs)' + fmt(totalNIC) + ''; } html += '';
// Effective rate var totalIncome = empIncome + selfProfit; var effectiveRate = totalIncome > 0 ? (totalEmployeeNIC / totalIncome) * 100 : 0; html += 'Your effective NIC rate: ' + effectiveRate.toFixed(2) + '% of total income.
';
var resultDiv = document.getElementById('nat-result'); resultDiv.style.display = 'block'; resultDiv.innerHTML = html; }
#### Formulas Used (2024/25 Tax Year)
Employee Class 1 NICs:
Employer Class 1 NICs:
Class 2 NICs (Self-Employed):
Class 4 NICs (Self-Employed):
#### Assumptions & References
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