What hiring your next employee actually costs
Most owners decide a hire on the wage they can picture paying. The wage is usually the easy part. Here is how we work the full figure out with clients before an offer goes anywhere near an inbox.

What hiring your next employee actually costs is almost never the number in the job advert. The usual route is to settle on a wage, glance at the bank balance, and make the call from there. Then the first payroll run goes through, the pension starts, employer National Insurance comes off, and the monthly figure is noticeably bigger than the one in your head.
We model hires for owners most months, and the pattern holds. The salary is the part people plan for. The cost that catches them is everything attached to it, plus the stretch of time before the new person covers their own seat.
Below is how we work it out: the costs that sit on top of the wage, why the first few months are the expensive ones, and the single number worth writing down before you make the offer.
The wage is only the start
Think of the salary as the base layer. On top of it sit employer National Insurance, the employer pension contribution once the person is enrolled, and the holiday they build up from day one. Holiday is easy to miss because you pay it as normal wages, so it never shows up as a line called holiday. It shows up as weeks when the work still has to be covered and the wage still goes out.
Then come the costs nobody writes on a spreadsheet. Employers’ liability insurance. A phone, a laptop, tools, boots, a seat in the van. Statutory sick pay if they are ill, and cover for the job while they are. Training, induction, and the days where your most productive person is teaching rather than earning. Recruitment itself, whether that is an agency fee or your own evenings spent reading applications.
None of this is exotic. Government guidance on employing staff and on workplace pension duties sets out what you are legally on the hook for. The problem is that it is set out as duties, not as a monthly cost, and it is the monthly cost that decides whether you can do this.
Why the first few months cost most
A good hire does not arrive at full output. On a site, a new pair of hands slows the squad down for a few weeks before it speeds them up. In a salon, a new stylist starts with gaps in the column. In an agency, the account work goes to the person who already knows the client, so the new hire bills less than the hours they are being paid for.
That period is the real cash risk. You are carrying the full employment cost against partial output, and you are usually doing it in the same month as the VAT payment or a quarter where a customer pays late. We have seen more hires go wrong because of timing than because of the person.
So we plan the hire against the cash, not only against the profit. That means knowing what goes out on payroll and pension each month, when VAT and corporation tax land, and how much headroom there is if one big invoice slips by a month. When the figures are current all year rather than written up at the year end, that question takes an afternoon. When they are nine months old, it is a guess dressed up as a plan.
Most owners decide the hire on the wage they can picture paying. The figure that matters is how much extra the business has to bill every month to carry that person.
The number that decides the hire
Here is the number we put in front of owners. Take the full monthly employment cost, wage plus employer National Insurance plus pension plus the kit and insurance, then divide it by your gross margin on the work this person will do. That gives you the extra sales the business has to make every month just to stand still with the hire in place.
It is usually a bigger number than owners expect, and it is the one that makes the decision honest. A trades business working on thin margins on materials needs a surprising amount of extra turnover to carry one more employee. An agency with a strong margin on retained work needs less, but needs the retainers to actually renew.
Once that figure exists, the conversation changes shape. You stop asking whether you can afford the wage and start asking where the extra work comes from, how quickly, and what you would do if it arrives two months later than hoped. Some owners look at it and hire the next week. Some decide to raise prices first, or to use subcontract labour for another quarter. Both are good decisions, because both were made on a number.
Reliefs and the tax side of payroll
Two things work in your favour, and neither should be the reason you hire.
Wages, employer National Insurance, and employer pension contributions are costs of the business, so they reduce the profit the company pays corporation tax on. That softens the net cost, though it does nothing for the cash going out of the account this month, which is the part that bites.
Eligible employers can also claim the Employment Allowance, which reduces the employer National Insurance bill for the year. Eligibility has conditions, and the rules on connected companies catch out owners who run more than one limited company, which is common in the motor trade where there is a company per site. The ACCA and GOV.UK both publish current guidance, and the rates change at the start of each tax year, so check the position for the year you are hiring in rather than the one you remember.
There is also the paperwork. You need to be registered as an employer before the first payday, run payroll under real time reporting, assess the new starter for a pension, and hold the right starter information. Done as routine it is dull. Done late it turns into penalties and a backdated pension bill.
How we cost a hire before the offer
When a client asks about a hire, we build the whole figure with their own numbers: the wage, employer National Insurance, the pension, the equipment, and the cover, set against the work on the books and the cash coming in over the next few months. Then we say what we think.
One agency owner wanted to bring an account manager in house. We modelled what the salary really cost once PAYE, pension, and employer National Insurance were in, put it against the retainers, and built a cash plan around the payroll dates. The offer went out as a decision rather than a hope, and the monthly figures showed the retainers covering it.
A salon owner did the same before she signed a lease on larger premises. The rent and the extra staff were costed first, payroll and pension duties were set up for the new team, and we planned the following year with her in the autumn rather than reconstructing it at the year end. She went from one small shop with one member of staff to the bigger premises with four or five, with a training business running alongside it.
That is what management accounts and virtual FD support are for: the hire becomes a number instead of a feeling.
Common questions
How much does an employee cost on top of their salary?
It depends on the wage, the pension position, and what the role needs in kit and insurance, so there is no single multiplier worth quoting. The honest way to answer it is to add employer National Insurance, the employer pension contribution, equipment, insurance, and holiday cover to the specific salary you have in mind, then look at the monthly total.
Is it cheaper to use a subcontractor or freelancer instead?
Often it looks cheaper per day, because you are not carrying pension, holiday, or sick pay. The trade is control, availability, and compliance. Employment status rules and, in construction, CIS obligations still apply, and getting the status wrong is expensive. We work the comparison both ways with real day rates rather than assuming one route wins.
What do I need to do before my first employee’s first payday?
Register as an employer with HMRC, set payroll up so submissions go in on or before each payday, collect the starter information, assess the employee for a workplace pension, and put employers’ liability insurance in place. Doing all of it before the first payment avoids backdated pension contributions and late filing penalties later.
How do I know if the business can afford the hire?
Look at two things together. First, the extra monthly sales needed to cover the full employment cost at your gross margin. Second, the cash position on payroll dates over the next six months, including VAT and corporation tax payments. If both hold with some room to spare, the hire is a decision rather than a gamble.
Related reading
Our take on hiring
What hiring your next employee actually costs is the wage, plus the employment costs attached to it, plus a few months of partial output, measured against the cash in the account on payroll day. Work that out and most hires either look obviously affordable or obviously early, and either answer is useful.
The owners who get this wrong are rarely reckless. They are busy, and their accountant only speaks to them once a year, so the sums get done in their head on a Tuesday night. If you are weighing up a hire in the next few months and want the full figure on paper first, with an opinion attached, that is the sort of thing we go through on the free growth review with Crosby.