Work out the fully loaded cost of employing staff in the UK for the 2025/26 tax year. Includes the new 15% employer National Insurance rate above the £5,000 secondary threshold, auto-enrolment pension (minimum 3% employer contribution), and total team costs. Updated for April 2025 changes.
Inputs
Gross annual salary before tax.
UK employer NI rate from April 2025 is 15% (up from 13.8%). Applied above the £5,000 secondary threshold.
Minimum employer auto-enrolment pension is 3% of qualifying earnings. Many employers contribute 5–10%.
Total headcount in this role or team.
Results
Total Cost Per Employee
$58,250
How to use
Enter the gross annual salary for the role you are costing. For the 2025/26 tax year, the default NI rate is 15%.
The employer NI rate defaults to 15% — the new rate from April 2025. Only change this if you are modelling a previous tax year or a different jurisdiction.
Set the employer pension contribution rate. The legal minimum is 3%, but the UK median employer contribution is around 5%. Enter your actual rate.
Enter the number of employees at this salary level to see total team costs.
Review the fully loaded cost per employee, the on-cost percentage, and the total annual team cost.
Worked Example
Let us walk through the true employer cost of a Software Engineer on a £50,000 annual salary in the 2025/26 tax year, using the new employer NI rates that took effect in April 2025.
Base salary
£50,000 gross annual salary.
Employer NI calculation
NI-able earnings = £50,000 − £5,000 (secondary threshold) = £45,000. Employer NI = £45,000 × 15% = £6,750.
Pension contribution
At the minimum 3% employer rate: £50,000 × 3% = £1,500. If you contribute 5%, this rises to £2,500.
Total employer cost
£50,000 + £6,750 + £1,500 = £58,250 per year (at 3% pension). That is a 16.5% on-cost above the headline salary.
Monthly cost
£58,250 ÷ 12 = £4,854 per month per employee.
Team of 10
For a team of 10 at this salary: £58,250 × 10 = £582,500 per year. That is £82,500 more than the headline salary bill of £500,000.
Key Takeaway
Under the old 2024/25 rates (13.8% above £9,100), the same £50,000 salary cost the employer £57,144 — so the April 2025 changes add approximately £1,106 per employee per year. For a 100-person company at average salaries, this could mean over £100,000 in additional annual costs.
Guidance
The true cost of an employee is significantly more than their salary. Under the 2025/26 rates, employer NI alone adds approximately 13–15% on top of salary (for typical salaries above £20,000), and pension adds at least 3%. A £50,000 salary costs the employer £58,250 once NI and pension are included — a 16.5% on-cost. For higher earners, the on-cost percentage is even greater because more of their salary sits above the NI threshold. Always use fully loaded costs in your headcount budget to avoid unpleasant surprises when the payroll hits your P&L.
Deep Dive
The cost of employing someone in the United Kingdom goes well beyond the salary you agree during the hiring process. UK employment law requires employers to pay National Insurance contributions and pension contributions on top of gross salary, and from April 2025, these statutory costs have increased significantly.
Employer National Insurance is a payroll tax charged on earnings above the secondary threshold. For the 2025/26 tax year (starting 6 April 2025), the employer NI rate increased from 13.8% to 15%, and the secondary threshold dropped from £9,100 to £5,000 per year. This double change — a higher rate applied to a larger portion of salary — means employer NI costs have risen substantially. For a £50,000 salary, employer NI increased from approximately £5,644 to £6,750, a rise of nearly 20%.
Auto-enrolment pension contributions became mandatory for most UK employers in 2018. The minimum employer contribution is 3% of qualifying earnings (broadly, earnings between £6,240 and £50,270 for 2025/26). However, many employers contribute on the full salary to simplify payroll and attract talent. The total minimum contribution (employer plus employee) is 8%, with employees contributing at least 5%. Employers can choose to contribute more, and the UK median employer pension contribution is around 5%.
The apprenticeship levy applies to employers with an annual pay bill exceeding £3 million. The levy is charged at 0.5% of total pay bill, offset by a £15,000 annual allowance. For qualifying employers, this adds roughly 0.5% to the cost of every employee. Levy funds can be used to pay for apprenticeship training, but unused funds expire after 24 months.
Beyond these statutory costs, prudent financial planning should account for additional employment overheads: recruitment fees (typically 15–25% of first-year salary for agency hires), equipment and IT setup (£1,000–£3,000 per head), training and development budgets, office space costs, software licences, and optional benefits such as private medical insurance, income protection, cycle-to-work schemes, and enhanced parental leave. In total, the fully loaded cost of an employee — including all direct and indirect costs — is commonly 1.25× to 1.5× the base salary.
When building headcount budgets, always use the fully loaded cost rather than headline salary. This ensures your P&L forecast reflects the true cash outflow, prevents budget variances when statutory deductions hit the accounts, and gives hiring managers an accurate picture of what each new role actually costs the business. Grove FP automates this by calculating employer NI and pension at the position level, so your workforce plan and financial model stay perfectly aligned.
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