Employee Cost Breakdown Calculator

The full cost of an employee includes far more than their headline salary. Mandatory costs include employer National Insurance (15% above £5,000 for 2026/27), workplace pension (minimum 3% of qualifying earnings) and employer's liability insurance. These statutory requirements add approximately 18-20% on top of the gross salary.

Discretionary costs may include private medical insurance (averaging £1,000-£2,000 per employee), training and development budgets, equipment and IT costs, office space per head, recruitment costs (typically 15-25% of salary for agency hires) and any performance bonuses or profit-sharing schemes.

This calculator provides an itemised breakdown of all employer costs. Enter the salary and toggle each optional benefit to build a complete picture. The output shows both the per-employee cost and the cost as a percentage of salary, helping businesses budget accurately for headcount expansion.

True cost of an employee. Gross salary is just the headline. Add: Employer NI 15% on earnings above £5,000 (post-April 2025); Pension auto-enrolment 3% on £6,240-£50,270 qualifying earnings; Apprenticeship Levy 0.5% if total pay bill >£3m; statutory paid holiday accrual; employer's liability insurance; recruitment cost (10-20% of salary amortised). Total overhead 15-25% above gross salary. £40k salary really costs £45-£48k.

Hidden costs beyond statutory. Office space: £500-£1,500/month per employee in London, £200-£500 elsewhere. Equipment: laptop, phone, software licences ~£1,500-£3,000 one-off + £800/year SaaS. Training and development: 1-3% of salary, often more for tech roles. Statutory sick pay (£123.25/week up to 28 weeks). Maternity/paternity pay (much reclaimed but cashflow impact). Management overhead: 10-20% of salaried manager's time per direct report.

Cost comparison: contractor vs permanent. £450/day contractor at 220 working days = £99,000. Permanent on £75k salary fully loaded ~£94k. Contractor: no holiday/sick pay, no pension liability, easy termination, immediately productive. Permanent: training, ongoing development, retention, redundancy liability. Contractor wins for short engagements (<6 months) or peak demand. Permanent wins for stable long-term work — generally 10-15% cheaper at full utilisation.

Salary sacrifice efficiency for employers. Employees sacrificing into pension save employer 15% NI on the sacrificed amount, plus 0.5% Apprenticeship Levy if applicable. On £1,000 sacrifice, employer saves £155. Best-practice employers RETURN this saving as additional pension contribution (NI passback) — turning £1,000 into £1,155. Costs employer nothing beyond admin — boosts retention without raising salary budget. Worth implementing if your scheme doesn't yet have it.