The True Cost of an Employee: A Payroll Guide

The true cost of an employee is their gross salary plus employer National Insurance, the employer's pension contribution, and a set of smaller costs such as holiday cover, insurance, equipment and payroll administration. For a small business, those extras can add a meaningful slice on top of the salary figure on the job advert.

Getting this number right before you hire matters more than getting it right afterwards. This guide shows you every layer of cost, how to calculate each one with the current figures from GOV.UK, and the budgeting mistakes that most often catch first-time employers out.

Key takeaways

• Gross salary is the starting point, not the total cost.
• Employer National Insurance is paid on top of salary, above a threshold, and is separate from the employee's own contributions.
• Most employees must be auto-enrolled into a workplace pension with an employer contribution.
• Holiday, insurance, equipment and admin add further costs that are easy to forget.
• The Employment Allowance can reduce employer National Insurance for eligible businesses.

What "true cost" means

The true cost of employment, sometimes called the fully loaded cost, is the total amount the business spends to have that person working for it for a year. It includes statutory costs you cannot avoid, such as employer National Insurance and minimum pension contributions, and practical costs that depend on the role, such as a laptop or a uniform.

The employee sees a different number. Their payslip starts from gross pay and deducts income tax, their own National Insurance and their pension contribution. Neither view is wrong; they are simply measuring different things. As the employer, the number you need to budget for is the fully loaded one.

Layer one: gross salary

This is the contracted pay before any deductions. It must meet the National Minimum Wage or National Living Wage for the employee's age, and those rates change each April. Check the current rates on GOV.UK before setting pay, particularly for part-time and younger staff.

Layer two: employer National Insurance

Employers pay Class 1 secondary National Insurance on employee earnings above a threshold. It is calculated each pay period through payroll and paid to HMRC alongside PAYE. Both the rate and the threshold have changed in recent years, so do not use a figure from an old article or last year's budget. HMRC's guidance for employers, including current rates, is on GOV.UK's PAYE for employers pages.

The calculation itself is simple: take the salary, subtract the annual secondary threshold, and apply the employer rate to what is left. Your payroll software does this automatically, but doing it once by hand when budgeting is worth the five minutes.

Eligible businesses can claim the Employment Allowance, which reduces the employer National Insurance bill each year up to a set amount. Not every employer qualifies — for example, some companies whose only employee is a director are excluded — so check the rules before assuming it applies.

Layer three: workplace pension

Under automatic enrolment, you must assess every worker and enrol those who are eligible into a qualifying workplace pension. The employer then pays at least the legal minimum contribution, usually calculated on a band of earnings rather than the whole salary. The minimum contribution levels and the earnings band are set out on GOV.UK's workplace pensions guidance for employers.

Employees can opt out after being enrolled, but you cannot encourage them to, and you must re-enrol eligible staff periodically. Budget as if everyone eligible stays in.

Layer four: the costs people forget

• Holiday. Full-time workers are entitled to 5.6 weeks of paid leave a year. If the work still has to be done, someone else may need paying to cover it.
• Sickness. Statutory Sick Pay is payable to eligible employees and is generally not reclaimable by the employer.
• Employer's liability insurance. Most employers are legally required to hold it from the first employee.
• Equipment and software. A laptop, phone, licences, tools or uniform.
• Recruitment and training. Advertising, agency fees and the time spent getting someone up to speed.
• Payroll administration. Running payroll, submitting to HMRC each pay day, payslips, pension uploads and year-end tasks.

Salary versus true cost, side by side

Step by step: budget a new hire

1. Set the gross salary and check it meets the current minimum wage for the role.
2. Look up this year's employer National Insurance rate and secondary threshold on GOV.UK and calculate the annual cost.
3. Check whether you qualify for the Employment Allowance, and deduct it if you do.
4. Calculate the employer pension contribution on qualifying earnings.
5. Add employer's liability insurance, equipment and any recruitment fees.
6. Add payroll administration, whether that is your time or a provider's fee.
7. Divide the total by twelve and check it against your monthly cash flow, not just annual profit.

Worked example (illustrative example)

"Marlow Garden Studio", an invented illustrative example, is a small limited company hiring its first full-time assistant on a gross salary of £28,000.

The owner's first budget was simply £28,000. Working through the layers changed the picture. Employer National Insurance was calculated as salary minus the secondary threshold, multiplied by the employer rate, both taken from GOV.UK for the current year. The company checked Employment Allowance eligibility and found it qualified, which reduced that bill. The employer pension contribution was worked out on the qualifying earnings band at the legal minimum. Then came employer's liability insurance, a laptop and a year of payroll administration.

The final figure was comfortably above the headline salary, and the monthly cash cost was higher again in the first month because of the equipment purchase. The owner still hired, but moved the start date by six weeks so the first month landed after a large customer payment rather than before it. The business and figures are invented to show the method, not a quote for any real role.

Common mistakes

• Budgeting on salary alone. Employer National Insurance and pension are unavoidable costs on top.
• Using last year's rates. Employer National Insurance and minimum wage figures change; check GOV.UK each April.
• Assuming Employment Allowance applies. Eligibility has conditions, and some director-only companies are excluded.
• Forgetting auto-enrolment duties. Assessment, enrolment and re-enrolment are legal obligations with their own deadlines.
• Ignoring cash timing. Payroll, PAYE and pension payments leave the bank every month, whatever your customers' payment terms are.

Getting payroll handled

Our payroll service starts from £25 per month per employee and covers running payroll and the submissions HMRC expects on or before each pay day. If you are a director paying yourself through the company too, our guide to the director's loan account explains how money you take out other than salary is tracked, and our limited company packages guide shows where payroll fits alongside accounts and tax.

Planning your first hire? Talk to us before you make the offer, or see our pricing.