When you hire someone in the UK, the salary you agree is only part of the cost. On top of the gross pay, employers must account for National Insurance contributions, pension obligations, and a range of other expenses that can add 20-40% or more to the headline salary figure.
Understanding these costs is essential for accurate budgeting, whether you're hiring your first employee or expanding an established team. Use our employee cost calculator for instant, personalised figures.
Ready to calculate? Get your exact employee cost figures.
These are the costs that every UK employer must pay by law:
1. Employer National Insurance (15%)
From April 2025, employers pay NI at 15% on all earnings above the Secondary Threshold of £5,000 per year. This is the largest mandatory cost above salary. For an employee on £30,000, employer NI costs £3,750 per year.
Eligible employers can reduce this with the Employment Allowance (up to £10,500 off your total NI bill). Calculate your exact NI cost with our employer NI calculator.
2. Workplace Pension (Minimum 3%)
Under auto-enrolment rules, employers must contribute at least 3% of qualifying earnings to a workplace pension for eligible employees. Qualifying earnings for 2026/27 are earnings between £6,240 and £50,270 per year.
For an employee earning £30,000, the minimum employer pension contribution is approximately £713 per year on a qualifying earnings scheme, or £900 on a total earnings scheme. See our pension calculator for exact figures.
3. Employers' Liability Insurance
By law, most employers must have Employers' Liability Insurance with a minimum cover of £5 million. This typically costs between £100-£500 per employee per year, depending on your industry and claims history.
Component
£25,000 Salary
£35,000 Salary
£50,000 Salary
Gross Salary
£25,000
£35,000
£50,000
Employer NI (15%)
£3,000
£4,500
£6,750
Pension (3% QE)
£563
£863
£1,313
Minimum Total
£28,563
£40,363
£58,063
% Above Salary
14.3%
15.3%
16.1%
Figures based on 2026/27 rates. Employer NI before Employment Allowance. Pension on qualifying earnings basis at minimum 3%.
Beyond the statutory minimums, employers typically incur significant additional costs:
Recruitment Costs
Job advertising: £200-£1,000+ per role (job boards, LinkedIn)
Recruitment agencies: typically 15-25% of annual salary
Interview time: management hours spent screening and interviewing
IT equipment: laptop, monitor, phone — £1,000-£2,500
Office furniture: desk, chair — £300-£800
Software licenses: £500-£2,000 per year (Office 365, industry tools)
Office space: £3,000-£8,000+ per desk per year (varies hugely by location)
Training and Onboarding
Induction costs: management time, materials, reduced early productivity
Professional development: courses, conferences, certifications
Mentoring: senior staff time dedicated to new hires
HR and Administration
Payroll processing: £5-£15 per employee per month (if outsourced)
HR software: £5-£10 per employee per month
Legal compliance: contracts, policies, health and safety
Hiring your first employee comes with one-off setup costs that don't apply to subsequent hires:
One-Off Setup Cost
Typical Amount
PAYE registration with HMRC
Free
Payroll software setup
£0-£500
Workplace pension scheme setup
Free (most providers)
Employers' Liability Insurance
£100-£500/year
Employment contracts and policies
£200-£1,000 (if using a solicitor)
Health and safety assessment
£100-£500
The good news for first-time employers is that the Employment Allowance will likely cover your entire NI bill. With a single employee earning up to around £75,000, the £10,500 allowance means you'd pay no employer NI at all.
Employment Allowance (£10,500)
The single biggest saving available. Reduces your total employer NI bill by up to £10,500 per year. From 2026/27, there is no cap on eligibility based on NI liability.
Salary Exchange for Pensions
When employees agree to sacrifice salary in exchange for employer pension contributions, both parties save NI. On a £30,000 salary with 5% employee contribution, the employer saves approximately £225 per year in NI. Multiply this across your workforce and the savings add up. See our pension calculator to model this.
Hiring Under-21s and Apprentices
No employer NI is due on earnings up to £50,270 for employees under 21 or apprentices under 25. This can save you £3,750+ per employee compared to hiring someone over 21 on a £30,000 salary.
Part-Time and Flexible Working
Part-time employees on lower salaries may fall below or closer to the Secondary Threshold, reducing NI costs proportionally. Two part-time workers can sometimes cost less in NI than one full-time worker on the same total salary.
Some businesses consider using contractors instead of employees to avoid employer NI and pension costs. While contractors can be cost-effective for project-based work, it's important to understand IR35 rules. HMRC may treat a contractor as an employee for tax purposes if the working arrangement resembles employment.
Key factors HMRC considers include:
Control over how, when, and where work is done
Whether the worker must do the work personally
Whether there is mutuality of obligation
As a rule of thumb, budget for 15-20% above salary for mandatory costs (NI and pension), and 30-40% above salary when including typical additional costs like equipment, training, and workspace.
For precise figures tailored to your situation, use our employee cost calculator. It covers employer NI, pension contributions, and additional costs with instant results you can email to yourself.
