A new hire typically requires two to four months of their total employment cost in working capital, because you start paying their salary, National Insurance, and expenses from day one, but the revenue they help generate does not convert to cash in your bank for weeks or months afterwards.
Most business owners think about hiring in terms of salary. Can we afford £40,000 a year? That is the wrong question. The right question is: do we have enough cash to cover this person’s total cost for the entire period before their work turns into money in our account?
Get this wrong and a hire that looks affordable on paper becomes the thing that tips your cash flow over the edge.
The Hidden Cash Cost of Hiring
When you bring someone on, the costs start immediately. The cash impact, roughly in order of when it hits your bank account:
Before they start: recruitment costs, equipment (laptop, phone, desk setup, software licences), onboarding materials.
From day one: gross salary, employer’s National Insurance (currently 15 per cent on earnings above the threshold), pension contributions (minimum 3 per cent), and any benefits.
Ongoing ramp-up period: reduced productivity during training, manager time spent supervising, and the inevitable cost of mistakes and rework.
Every business owner knows hiring costs money. The part that catches people out is the delay between spending that money and receiving cash back from the work the new person does.
The Delay: Your Cash Conversion Cycle
This is where working capital enters the picture. Your business already has a rhythm for how long it takes to convert work into cash. That rhythm is measured by your Cash Conversion Cycle – the number of days between spending money and receiving it back from customers.
If you are a professional services firm with a 42-day DSO (days sales outstanding), it means that on average, work you complete today does not become cash for six weeks. Hire someone new and you are paying them for six weeks before the first pound of their revenue reaches your bank account. And that assumes they are fully productive from day one, which they almost certainly are not.
Use the CCC Calculator to work out your exact number.
Worked Example: Hiring in a Professional Services Firm
Anderson Digital Ltd is a web development agency in Leeds with £1.8 million in annual revenue, twelve staff, and a cash conversion cycle of 42 days.
They want to hire a mid-level developer at £40,000 per year. Here is the real cost calculation:
Step 1: Total Monthly Employment Cost
| Cost Element | Annual | Monthly |
|---|---|---|
| Gross salary | £40,000 | £3,333 |
| Employer’s NI (15% above £5,000 threshold) | £5,250 | £438 |
| Pension (3%) | £1,200 | £100 |
| Software licences | £1,800 | £150 |
| Total | £48,250 | £4,021 |
Step 2: Working Capital Impact
The CCC is 42 days. That means Anderson Digital needs to fund roughly 42 days of this person’s cost before any revenue they generate converts to cash.
Working capital required = Monthly cost x (CCC / 30)
£4,021 x (42 / 30) = £5,629
Step 3: Add the Ramp-Up Period
A new developer is unlikely to be fully billable in their first month. Assume it takes six weeks before they are working at full capacity. During that period, the business is paying full cost but generating reduced revenue.
If they are at 50 per cent productivity for the first six weeks, that is an additional three weeks of full cost with no corresponding revenue:
Ramp-up cost = £4,021 x (3 / 4.3) = £2,805
Total Working Capital Needed
| Component | Amount |
|---|---|
| CCC-driven working capital | £5,629 |
| Ramp-up productivity gap | £2,805 |
| Equipment and setup | £1,500 |
| Total | £9,934 |
Anderson Digital needs roughly £10,000 in available cash to hire this £40,000-a-year developer without putting pressure on their existing cash flow. That is nearly 25 per cent of the annual salary, needed upfront.
Productive Roles vs Overhead Roles
Not all hires have the same working capital profile. The distinction matters.
Revenue-generating roles (sales, delivery, billable staff) eventually pay for themselves through the cash they bring in. The working capital requirement is temporary – you fund the gap until their revenue cycle kicks in, and then the cash flow becomes self-sustaining. Hiring a salesperson in a business with a 60-day CCC means funding roughly two months of their cost before their first deals convert to cash. But once the pipeline is flowing, each month’s revenue covers the next month’s cost.
Overhead roles (administration, finance, HR, IT support) do not directly generate revenue. Their value is real – they free up productive staff, reduce errors, improve compliance – but they permanently increase your monthly cash outflow without a corresponding direct inflow. The working capital impact is not a one-off gap but a permanent increase in your baseline costs.
This does not mean you should never hire overhead roles. It means you should be honest about the cash flow impact and make sure your revenue base can absorb it before you commit.
How to Phase Hiring to Match Cash Capacity
If you need three new people but can only absorb the cash impact of one at a time, phase the hiring to match your cash capacity.
Stagger start dates. Bring the first hire on and wait until their revenue contribution is flowing before committing to the second. For a business with a 42-day CCC, that means spacing hires roughly two to three months apart.
Start with the revenue generator. If you need a salesperson and an administrator, hire the salesperson first. Let their revenue create the cash capacity to fund the administrator later.
Use probation periods strategically. A three-month probation is not just about performance assessment. It is also the period where you confirm that the cash flow impact is manageable before you have a long-term commitment.
Model it before you commit. Add the new hire to your cash flow forecast and see where the pressure points appear. The Working Capital Calculator can help you quantify the impact against your current position.
When to Hire vs When to Outsource
From a cash flow perspective, outsourcing has one enormous advantage: you pay for output, not for time. There is no ramp-up gap, no equipment cost, and no commitment during quiet periods. For a cash-constrained business, paying £60 an hour for a freelancer who bills only when there is work can be cheaper in working capital terms than a £40,000-a-year employee who costs £4,000 a month regardless of workload.
Outsource when: workload is inconsistent, you cannot absorb the ramp-up period, cash reserves are below three months of operating costs, or the role is project-based.
Hire when: demand is consistent, your forecast shows you can absorb the gap, the role requires deep business knowledge, or retaining skills and relationships matters more than short-term cost.
Key Takeaways
- A new hire’s working capital impact is their total monthly cost multiplied by your cash conversion cycle in days – not just their salary
- Budget for a productivity ramp-up of four to eight weeks where you pay full cost for partial output
- Revenue-generating hires eventually become self-funding; overhead hires permanently increase your cash baseline
- Phase multiple hires to match your cash capacity – do not bring everyone on at once
- Always model the cash flow impact before committing, using your Working Capital Calculator and CCC Calculator
- Consider outsourcing when cash is tight or workload is inconsistent
This article is for general information only and does not constitute financial or employment advice. Employment costs vary depending on individual circumstances, and National Insurance rates are subject to change. Consult a qualified accountant for advice specific to your business.