5.2 National Insurance Contributions

5.2 National Insurance Contributions

1. Purpose and Statutory Structure of National Insurance

National Insurance Contributions (NICs) are statutory taxes levied on earnings in the United Kingdom, administered under the Social Security Contributions and Benefits Act 1992 (SSCBA 1992). Unlike general Income Tax, NIC revenues are hypothecated (ring-fenced) to fund state social security benefits, including the State Pension, Statutory Maternity Pay, and the National Health Service (NHS).

NICs are categorized into distinct classes based on employment status and income type:

• Class 1 Primary: Paid by employees on cash earnings from employment.
• Class 1 Secondary: Paid by employers on earnings paid to employees.
• Class 1A: Paid by employers on non-cash benefits in kind provided to employees.
• Class 1B: Paid by employers on PAYE Settlement Agreements (PSAs).
• Class 2 & Class 4: Paid by self-employed sole traders and partners.

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2. Class 1 NIC Structure & 2025/26 Statutory Thresholds

Class 1 NICs are assessed separately for each earnings period (weekly, monthly, or annually) and are non-cumulative. Unlike PAYE Income Tax, unused NIC thresholds from one pay period cannot be carried forward to offset earnings in a subsequent pay period.

For the 2025/26 tax year, Parliament established key statutory thresholds for Class 1 NICs:

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3. Class 1 Primary (Employee) NIC Rates & Calculations

Class 1 Primary NICs are deducted directly from the employee's gross pay by the employer. Employee NICs are calculated using a tiered band system applied to gross cash earnings in each specific earnings period:

$\text{Employee Primary NICs} = \text{Band 1 NICs (8\%)} + \text{Band 2 NICs (2\%)}$

2025/26 Employee Primary NIC Rates

1. Earnings up to PT (£242/wk or £1,047.50/mo): 0%
2. Earnings between PT and UEL (£242.01 to £967/wk or £1,047.51 to £4,189/mo): 8% (Main Primary Rate)
3. Earnings above UEL (> £967/wk or > £4,189/mo): 2% (Additional Primary Rate)

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4. Class 1 Secondary (Employer) NIC Rates & Calculations

Class 1 Secondary NICs represent a direct payroll tax on the employer, paid in addition to the employee's gross wages.

Following legislative adjustments effective for 2025/26, the Secondary Threshold (ST) was reduced to £96 per week (£416.67 per month or £5,000 per year), and the Employer Secondary Rate was set at 15%.

$\text{Employer Secondary NICs} = (\text{Gross Earnings} - \text{Secondary Threshold}) \times 15\%$

2025/26 Employer Secondary NIC Rates

• Earnings up to ST (£96/wk or £416.67/mo): 0%
• Earnings above ST (> £96/wk or > £416.67/mo): 15% (Secondary Rate)

Unlike employee NICs, employer secondary NICs have no upper limit. The 15% rate applies indefinitely to all earnings above the Secondary Threshold.

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5. The Employment Allowance

To support small and medium-sized enterprises (SMEs) and reduce the cost of employment, eligible employers can claim the Employment Allowance.

• Annual Allowance Amount: For 2025/26, the maximum allowance is £10,500 per year.
• Application: Offsets the employer's total Class 1 Secondary NIC liability until the £10,500 cap is exhausted across the tax year.
• Eligibility Restrictions:
  • Available to most businesses and charities.
  • Exclusion: Companies where a single director is the sole employee are strictly excluded from claiming the Employment Allowance.
  • Can only be claimed against one payroll scheme if a business operates multiple PAYE schemes.

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6. Special Rules for Directors' NICs

Company directors are statutory officers governed by special NIC rules under SSCBA 1992 s.13. Because directors have control over the timing of their remuneration (e.g. paying themselves nominal monthly salaries and a large annual bonus), standard weekly or monthly earnings periods could be exploited to minimize NIC liabilities.

To prevent this, directors' Class 1 NICs are assessed on an annualized cumulative earnings period basis using annual thresholds:

• Annual Primary Threshold (PT): £12,570
• Annual Secondary Threshold (ST): £5,000
• Annual Upper Earnings Limit (UEL): £50,270

Two Permissible Calculation Methods

1. Annual Cumulative Method (Standard): NICs are calculated on cumulative earnings from 6 April to date using full annual thresholds. No NIC is paid until cumulative earnings exceed £12,570 (for employee) or £5,000 (for employer).
2. Pro-Rata / Alternate Method: The director pays NICs during the year using standard monthly/weekly employee thresholds. However, in Month 12 (or the final pay period), a mandatory annual recalculation is performed comparing cumulative annual earnings against annual thresholds, and adjusting final NIC payments accordingly.

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7. Class 1A and Class 1B NICs Overview

Class 1A NICs (Benefits in Kind)

Class 1A NICs are payable exclusively by employers on the taxable cash equivalent of non-cash benefits in kind provided to employees (e.g. company cars, fuel, private medical insurance).

• Rate: 15% for 2025/26.
• Reporting & Payment: Reported annually on Form P11D(b) and paid to HMRC by 19 July following the tax year (22 July if paid electronically).

Class 1B NICs (PAYE Settlement Agreements - PSAs)

Class 1B NICs are payable by employers who enter into a formal PAYE Settlement Agreement (PSA) with HMRC to settle Income Tax and NIC liabilities on minor, irregular, or impracticable employee expenses and benefits (e.g. staff annual parties, corporate gifts).

• Rate: 15% for 2025/26, charged on the total value of benefits grossed up for Income Tax.
• Payment Deadline: Due by 19 October following the end of the tax year (22 October electronically).

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8. Worked Calculation Example: Monthly Payroll NICs

Scenario

For May 2026 (Month 2), Apex Trading Ltd processes payroll for an employee earning £4,500.00 gross per month. The company is eligible for the Employment Allowance and has £8,000 of allowance remaining.

Monthly Thresholds (2025/26)

• Primary Threshold (PT): £1,047.50
• Secondary Threshold (ST): £416.67
• Upper Earnings Limit (UEL): £4,189.00

Step 1: Employee Class 1 Primary NIC Calculation

• Band 1 (0% up to PT £1,047.50): £0.00
• Band 2 (8% between PT £1,047.50 and UEL £4,189.00): $(£4,189.00 - £1,047.50) \times 8\% = £3,141.50 \times 8\% = \mathbf{£251.32}$
• Band 3 (2% above UEL £4,189.00): $(£4,500.00 - £4,189.00) \times 2\% = £311.00 \times 2\% = \mathbf{£6.22}$
• Total Employee Primary NIC: £251.32 + £6.22 = £257.54

Step 2: Employer Class 1 Secondary NIC Calculation

• Earnings subject to Employer NIC: £4,500.00 - £416.67 = £4,083.33
• Gross Employer Secondary NIC (15%): $£4,083.33 \times 15\% = \mathbf{£612.50}$
• Less Employment Allowance Applied: £612.50 (offset against remaining £8,000 allowance)
• Net Employer Secondary NIC Payable to HMRC: £0.00

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9. Exam Traps & Common Pitfalls

Exam Trap 1: Applying Income Tax Personal Allowance to NICs Candidates often confuse the Personal Allowance (£12,570) with NIC thresholds. While the annual PT matches £12,570, the Secondary Threshold (ST) is £5,000 (£96/wk). Do NOT use £12,570 for employer NIC calculations!

Exam Trap 2: Assuming Employer NIC Caps at the UEL Employee Primary NIC drops to 2% above the UEL (£967/wk). However, Employer Secondary NIC has NO upper limit—the 15% rate applies to all earnings above the ST without capping.

Exam Trap 3: Single-Director Company Employment Allowance Error A company with only one director and no other employees cannot claim the £10,500 Employment Allowance.