Hiring Your First Employee in the UK: The Real Cost Beyond Salary

Your first employee is the moment your business stops being a one person operation and becomes an employer. It is also the moment a lot of UK founders discover that the salary on the offer letter is roughly two thirds of what the hire actually costs.

Getting this number right matters. Underestimate it, and a profitable looking month turns into a loss the first time payroll, pension and a holiday week land in the same window. The good news is the maths is not difficult once you see all the pieces in one place.

Start with the gross salary

Take a hire at £35,000 a year. That is the headline cost most founders quote. From the employer side, it is the smallest number in the calculation.

Add employer National Insurance

For 2026/27, employer NIC is 15 percent on earnings above the secondary threshold of £5,000 per year. On a £35,000 salary that is 15 percent of £30,000, which is £4,500.

If this is genuinely your first employee, you can usually claim the Employment Allowance, currently £10,500 per tax year, which is set against your employer NIC bill. Most genuinely small businesses qualify, but there are exclusions, including single director companies with no other employees and businesses where the director is the only person on payroll above the secondary threshold. Read the eligibility notes before relying on it.

Add the workplace pension

Auto enrolment requires a minimum employer contribution of 3 percent on qualifying earnings, which for 2026/27 means earnings between £6,240 and £50,270. On a £35,000 salary, qualifying earnings are £28,760, and 3 percent of that is £862.80.

Many UK employers now pay above the minimum, often 5 percent on full salary, to stay competitive. On £35,000, a 5 percent on full pay scheme costs £1,750 instead. The cheaper option is legal. The more generous option is often what wins the hire.

Add paid time off

Statutory holiday is 5.6 weeks a year, including bank holidays. For a full time worker on £35,000, that holiday is already inside the salary, so there is no extra cash cost. What it does cost is capacity. You are buying roughly 46.4 weeks of work, not 52.

If you also offer sick pay above statutory, parental pay above statutory, or a discretionary bonus, those are real cash costs to model. A common rule of thumb is to budget one to two percent of salary for occasional sick days and small benefits, even if you do not formally offer them.

Add the running overheads

These are the costs that almost no founder includes in the original spreadsheet, and they always show up.

Equipment for a knowledge worker, typically a laptop, monitor, peripherals and a chair, usually lands between £1,500 and £2,500 in year one, then a refresh budget of about a third of that each following year.

Software seats add up faster than expected. Email, document storage, project management, design or development tools, password management and a payroll bureau easily reach £80 to £150 per user per month. That is another £960 to £1,800 a year.

Insurance changes too. Employers' liability insurance becomes a legal requirement the moment you have your first employee, with minimum cover of £5 million. Premiums vary by trade but a desk based business will typically pay £60 to £200 a year for the employers' liability portion alone.

Recruitment is a one off but rarely zero. Even an in house hire usually involves job board fees, an assessment tool, or your own time costed properly. Agency placements run from 15 to 25 percent of first year salary.

The honest total

Put it together for a £35,000 hire at the minimum legal pension, with Employment Allowance covering the NIC.

1. Salary: £35,000
2. Employer NIC after Employment Allowance: £0 (using the £10,500 allowance against the £4,500 charge)
3. Pension at 3 percent on qualifying earnings: £863
4. Software, equipment depreciation, insurance, recruitment amortised over two years: roughly £3,000 to £4,000 in a normal year, more in year one.

Steady state, you are looking at about £39,000 a year. In year one, closer to £42,000 to £44,000 once you include kit and recruitment.

Now run the same hire without Employment Allowance, on a 5 percent full salary pension. NIC of £4,500 plus pension of £1,750 plus overheads of £3,500 brings you to about £44,750 steady state. The same person, two different employer setups, costs £5,500 a year apart.

What founders should actually do before the offer

Three things make the difference between a hire that pays for itself and one that quietly damages the business.

First, model the full cost, not the salary. The numbers above belong in a spreadsheet on the day you start drafting the job description, not the day before payroll.

Second, decide what work this hire takes off you, and price that work. If your own time is worth £80 an hour and the hire frees up 15 productive hours a week, you have £62,400 of recovered capacity to set against the £42,000 cost.

Third, run a three month cash flow with the hire in it. UK PAYE and pension payments are monthly. VAT is quarterly. Corporation tax is annual. The first time these align badly is the first time a profitable hire feels like a problem. A simple monthly cash flow forecast, refreshed weekly for the first quarter, removes most of the surprise.

The bottom line

A UK employee in 2026/27 costs roughly the salary plus 10 to 25 percent, depending on Employment Allowance, pension generosity and overheads. Build that uplift into your hiring decision from the start, and the hire becomes a planned investment with a known payback. Skip it, and you are running an experiment with your own payroll.