Employer National Insurance 2026/27: Complete Business Cost Guide

Employer National Insurance 2026/27: The Complete Guide

Employer National Insurance is the largest hidden cost of employment in the UK. At 15% on earnings above £5,000, it inflates payroll costs by 11–15% above the headline salary figure — a cost that employees never see on their payslips and that many business owners dramatically underestimate in their financial planning.

The Rates: 2026/27

This 15% rate was introduced from April 2025 (raised from 13.8%) and continues for 2026/27. The Secondary Threshold is £5,000/year (£96/week).

True Employment Costs at Every Salary Level

Pension calculated on qualifying earnings (£6,240–£50,270). Figures exclude employer liability for benefits, equipment, or other employment costs.

Employment Allowance 2026/27: £10,500

The Employment Allowance reduces employer NI bills by up to £10,500 per year — the most valuable relief available to small and medium employers.

Eligibility:

• Your employer NI bill was under £100,000 in the previous tax year
• You are not a sole director/employee company (single director, no other employees)
• You are not a public body (central/local government, NHS, police forces)
• You are not a connected company already claiming in the same group

How to claim: Via Employer Payment Summary (EPS) in your payroll software. Mark "yes" for Employment Allowance at the start of each tax year. Applied automatically against monthly PAYE payments until £10,500 is exhausted.

Critical: Claim at the start of the tax year — it only applies to the current year and cannot reduce bills below the year's total NI. Don't leave it until March.

Employment Allowance Examples

Small business with 4 staff at £25,000:

• Total employer NI: £(25,000−5,000) × 15% × 4 = £12,000
• Employment Allowance: £9,540
• Net employer NI bill: £0 (saving £9,540)

Growing business with 10 staff at £35,000:

• Total employer NI: £(35,000−5,000) × 15% × 10 = £45,000
• Employment Allowance: £10,500
• Net employer NI bill: £28,350 (saving £10,500)

Zero-Rate Employer NI Exemptions

The following employees attract zero employer NI on earnings up to the Upper Secondary Threshold (£50,270):

Under 21 employees: Maximum annual saving per worker: (£50,270 − £5,000) × 15% = £6,790.50. Applies to all employees aged under 21 — no additional qualification needed.

Apprentices under 25: Same £6,176 maximum saving. Must be genuinely enrolled in a qualifying apprenticeship standard or framework.

Armed Forces veterans: Zero rate for the first 12 months of their first civilian employment after leaving service.

Freeport and Investment Zone employees: Zero rate on earnings up to £25,000 for up to 3 years from start of qualifying employment. Applies in designated Freeport and Investment Zone areas across England.

Salary Sacrifice: Reducing Employer NI

Every pound of salary sacrifice reduces employer NI by 15%. For a company with 20 employees each sacrificing £3,000/year for pension:

• Annual employer NI saving: £3,000 × 15% × 20 = £9,000
• At 19% corporation tax, additional CT saving on employer NI saved: ~£1,710
• Total annual benefit: ~£10,710

Many employers pass 50–100% of their NI saving to employees' pension pots — creating mutual benefit.

Director Salary Optimisation

Owner-directors have two key salary strategies:

£5,000 salary (Secondary Threshold):

• Zero employer NI
• Zero employee NI
• Zero income tax
• Salary deductible against corporation tax (saving 19%: £1,729)
• No qualifying NI year earned (below LEL of £6,708)

£12,570 salary (Personal Allowance):

• Employer NI: £(12,570 − 5,000) × 15% = £1,135.50
• Zero employee NI, zero income tax
• Larger CT deduction (saving 19%: £2,388)
• Net CT benefit after employer NI: £2,388 − £1,135.50 = £1,252.50 vs £950

The £12,570 strategy produces marginally higher benefit at 19% corporation tax. At higher CT rates (25%), the optimal choice shifts. Your accountant should model this annually based on your specific position.

Common Employer NI Mistakes

1. Forgetting to claim Employment Allowance: Must be actively claimed each tax year via payroll software EPS.

2. Missing the under-21 zero rate: Applies to all employees under 21, not just apprentices. Check birthdays in your payroll.

3. Connected companies claiming separately: Only one company in a connected group may claim Employment Allowance.

4. Not applying the threshold to part-week starters: The £5,000 threshold pro-rates based on actual pay period length. Payroll software handles this automatically.

5. Late EPS filings: HMRC assumes maximum liability if monthly EPS is not filed. Always file on time.

Frequently Asked Questions

Q: Is employer NI tax deductible for my business? Yes — fully deductible as a business expense against taxable profits (corporation tax for limited companies, income tax for sole traders and partnerships).

Q: What are the penalties for late employer NI payment? Interest accrues immediately. Penalty rates: 1% for 1–30 days late; 2% for 31–90 days; 5% for 91+ days; 15% for 12+ months. Late payment is a common trigger for HMRC investigation.

Q: Do I pay employer NI on termination payments? Only on the portion treated as earnings (e.g., contractual payments in lieu of notice). The first £30,000 of genuinely compensatory payments is exempt from both income tax and employer NI.

Q: I'm a sole trader — do I pay employer NI on my own drawings? No. Sole traders pay Class 4 NI on profits. Employer NI applies only when hiring employees. Once you hire staff, employer NI applies to their wages from the first pound above £5,000.