See the real cost of hiring, beyond the salary. Includes employer NI at the new 15% rate, auto-enrolment pension, holiday accrual, recruitment, equipment and overhead. Updated for the April 2025 NI changes.
Calculate your true cost per hire using the SHRM/ANSI standard formula. Covers both internal costs (HR time, manager interview time) and external costs (agency fees, job boards, assessments).
Internal costs
External costs
Compare the true employer cost of two different salary levels. Useful when deciding between a junior and senior hire, or benchmarking a counter-offer.
When a business owner or finance director sees a £35,000 salary, they often think that is what the employee costs. In reality, the total employer cost is typically 125%-140% of the gross salary and for senior hires with significant benefits, overhead and recruitment costs, it can be considerably more.
Understanding the true cost is essential for accurate headcount budgeting, business case preparation, and making informed decisions about whether to hire, use a contractor, or outsource.
The single biggest on-cost change in recent years is the April 2025 employer NI increase. The rate rose from 13.8% to 15% and the secondary threshold, the earnings level above which employer NI is charged, dropped from £9,100 to £5,000 per year. This means employers now pay NI on a much larger portion of each employee's salary.
For a business with 10 employees on £35,000, this change alone adds over £9,000 per year in additional employer NI. The Employment Allowance (up to £10,500 per year for eligible businesses) offsets some of this for smaller employers, but mid-sized and larger businesses bear the full cost.
Employers must enrol eligible workers into a workplace pension and contribute a minimum of 3% of qualifying earnings. Qualifying earnings are banded for 2026/27 the lower limit is £6,240 and the upper limit is £50,270. This means the 3% does not apply to the full salary for most workers.
Many employers offer contributions above the 3% minimum as part of their benefits package. Higher pension contributions improve staff retention but increase the employer cost accordingly.
Statutory minimum holiday entitlement in the UK is 5.6 weeks per year, 28 days including bank holidays for a standard five-day week worker. Every day of paid holiday is a day the employee is not productive but is still being paid. The holiday cost as a percentage of salary is approximately 10.8% of working time (28 ÷ 260 working days).
For an employee on a £35,000 salary, 28 days of paid holiday represents approximately £3,769 of paid non-working time per year. This is often overlooked in cost calculations.
| Cost component | Typical amount | Notes |
|---|---|---|
| Gross salary | 100% | Base cost |
| Employer NI (2026/27) | ~12-13% | 15% above £5,000 secondary threshold |
| Auto-enrolment pension | ~2-3% | Minimum 3% of qualifying earnings |
| Holiday pay accrual | ~10–11% | 28 days ÷ 260 working days |
| Overhead per head | £1,500-£4,000 | Office, IT, insurance, software |
| Training & development | £500-£2,000 | Annual average per employee |
| Recruitment cost (amortised) | £1,500–£5,000 | One-off, amortised over tenure |
| Total true cost | 125%-145% | Of gross salary, typical range |
If you use a recruitment agency, the fee is typically charged as a percentage of the successful candidate's first-year salary. Standard rates range from 10% for junior/volume roles up to 25-30% for senior, specialist or executive positions. Some agencies charge a flat fee or a retained search fee structure.
Agency fees are a one-off cost but can be substantial. For a £50,000 salary hire through an agency charging 20%, the fee is £10,000, which, amortised over a three-year tenure, adds approximately £3,333 per year to the true cost. This is why employee retention directly impacts your cost per hire over time.
One common alternative to employment is hiring a contractor or freelancer. Contractors typically charge a day rate or project fee that is higher than the equivalent employee daily cost. However, employers save on NI, pension, holiday pay, and benefits. For short-term or specialist work, a contractor can be more cost-effective despite the higher headline rate.
For ongoing roles where you need full-time commitment, consistent output and institutional knowledge, direct employment usually wins on a total cost basis, particularly since IR35 changes mean many contractors are now being caught inside IR35 anyway.
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