Here’s how to write a business case for HR that the board will fund: put a pound figure on the problem first, then show what fixing it is worth against what it costs. Boards don’t turn down HR proposals because they dislike people. They turn them down because the proposal arrives as a cost with no matching return, which means you brought an HR argument to a finance fight.
You spent weeks on the deck. You had the engagement scores, the burnout data and the quotes from the staff survey. The CFO looked at the last slide, asked what the return was, and the proposal quietly died. It wasn’t that the problem was unreal. It was that nobody had translated it into the language the board uses to make decisions.
This guide covers what your CEO and CFO actually care about, how to calculate the cost of the problem in a service business, a simple HR ROI formula with worked examples, and a one-page structure for your next business case.
Table of Contents
Why most HR business cases fail
Most HR proposals are written in HR language: wellbeing, engagement, learning journeys, culture. To a CFO, those words describe costs. Without a number attached, they sit in the same mental column as office plants and away days, and they lose to anything that can show a return.
The fix isn’t to stop caring about people. It’s to describe the same problem in the terms the board already uses. In a professional services firm, that is straightforward, because your people are your inventory. When a consultant, recruiter or account manager leaves, the business loses billable capacity the moment they walk out of the door. That is a margin problem, not a morale problem, and margin problems get funded.
What the CEO and CFO actually care about
Before writing a word, map what keeps each person awake at night, and make sure your case answers it directly.
- The CEO cares about growth and execution. Will we hit the plan? Do we have the people and the managers to deliver it?
- The CFO cares about margin, predictability and runaway costs. What does this cost, what does it return, and how sure are we?
- Both care about risk. What happens if we do nothing?
A good business case answers all three in the first minute. A weak one spends ten slides on the problem from HR’s point of view and leaves the return to the final page.
Put a number on the problem: the cost of doing nothing
Never present a cost without the cost of doing nothing next to it. For most people initiatives, the clearest number is staff turnover, because every service business already feels it.
Start with your own turnover rate and compare it with the benchmark. The CIPD puts average UK staff turnover at about 15 per cent. Then cost a single regrettable exit properly, not just the recruitment fee:
- lost output while the person is disengaged and working their notice
- the months the seat is empty, or covered by an overloaded colleague
- recruitment fees and the hours spent interviewing
- the ramp-up period before a new hire reaches full productivity
Our employee turnover cost calculator will give you a defensible starting figure. Multiply it by your number of leavers and you have the annual cost of the problem, in pounds, before you have said anything about culture.
A simple HR ROI formula
Once you know what the problem costs, the return on fixing it comes from one formula:
HR ROI = (cost of the problem × expected reduction) ÷ cost of the initiative
Here are three illustrative worked examples. Swap in your own figures before you use them.
- Retention. 100 leavers a year cost £1m. An initiative that cuts that by 40 per cent saves £400k. Against a £60k cost, that’s about 6.7 times the investment.
- Burnout. Avoidable errors and rework cost about £1m a year. A 10 per cent reduction saves £100k. Against a £20k cost, that’s 5 times.
- Turnover at scale. A 1,000-person firm at 15 per cent turnover loses about £1.98m a year. A 10 per cent reduction saves about £200k. Against a £40k tool, that’s about 5 times.
Add a risk premium. The less proven the initiative, the higher the return the board will reasonably expect, so a pilot with a 3 times return may be easier to approve than a big programme promising 10 times. Supplier case studies and your own pilot data both help here, because they turn your expected reduction from a guess into evidence.
How to write a business case for HR: a one-page structure
Keep the case to one page, with the detail in an appendix. Use these five headings:
- The problem in pounds. “Regrettable turnover in the delivery team is costing us about £500k a year in lost billing and replacement costs.”
- The cost of doing nothing. “On current trends, that rises to £650k next year as we grow headcount.”
- The proposal. What you’ll do, who owns it and when it starts.
- The return. The formula above, with your assumptions stated plainly.
- How we’ll know. The two or three measures you’ll report back on, and when.
That last heading matters more than most HR teams realise. Boards fund people they trust to report honestly. Committing to measures up front, and coming back with them, makes the next business case much easier to win.
Words to swap before you present
Small language changes make a big difference to how a proposal lands. Before you send the deck, try these swaps:
- “Engagement” becomes “productivity” or “capacity”.
- “Wellbeing programme” becomes “absence and error reduction”.
- “Retention initiative” becomes “protecting billable capacity”.
- “Culture” becomes “how consistently teams deliver”.
- “We need budget for” becomes “we can save”.
If you need a source for why engagement belongs in a finance conversation, Gallup’s Q12 meta-analysis found that top-quartile teams for engagement showed 23 per cent higher profitability and 18 per cent higher sales productivity than bottom-quartile teams. It’s a correlation rather than proof of cause, so present it that way.
Worked example: before and after
Here is the same request written two ways.
Before: “We need £40k for an employee engagement platform because morale is low and people are leaving.”
After: “Regrettable exits in the tech team cost us about £500k last year. If we do nothing, we expect to lose four more senior developers by Q3, putting another £300k of billing at risk. A £40k listening and early-warning programme that cuts those exits by a third would protect around £100k in its first year, and we’ll report the results to this board in six months.”
The second version asks for the same money. The difference is that the CFO can now see an investment with a return, rather than a cost centre asking for more. Wotter is one example of the kind of tool that can sit behind a case like this, but the structure works for any people initiative.
Frequently asked questions
How do you write a business case for HR?
Lead with the problem in pounds, show the cost of doing nothing, describe the proposal briefly, calculate the return with stated assumptions, and commit to two or three measures you’ll report back on.
How do you calculate HR ROI?
Multiply the annual cost of the problem by the reduction you expect, then divide by the cost of the initiative. A £1m problem cut by 40 per cent for £60k gives about 6.7 times the investment.
What does a CFO want to see in an HR proposal?
A clear cost, a credible return, the risk of doing nothing and how success will be measured. Language about wellbeing or engagement only works once it is tied to money.
What is the cost of doing nothing?
The cost the business carries if the problem continues, such as lost billing and replacement costs from staff turnover. Presenting it alongside your request shows the board the real choice.
Why do HR business cases get rejected?
Usually because they describe a cost without a matching return, use HR language rather than financial terms, or don’t say how success will be measured.
Stop pitching sentiment, start pitching margin
Your people are your inventory, and every regrettable exit is lost stock. Once you quantify that leak, you stop being the person asking for budget and become the person offering to protect margin. That’s the shift that gets HR proposals funded.
For the full conversation, listen to Episode 7 of Strategic HR Weekly, where we walk through how to pitch EBITDA protection to your board.
