Key person risk — also called key man risk or owner dependency — is when a business relies so heavily on one individual that its value is inseparable from their continued involvement. For the 95% of Australian SME owners whose business is also that individual, this becomes a direct problem the moment you decide to sell. Buyers don’t pay full price for a business they can’t run after you leave. The discount for high owner dependency typically runs between 20% and 40% of what the business would otherwise be worth — and in some cases, it kills the deal outright.
The good news is that it’s fixable. The bad news is that it takes time, and most owners don’t start early enough.
What Is Key Person Risk in a Business Sale?
Key person risk exists when the departure of one person would materially reduce a business’s ability to generate profit. In a sale, “departure” is precisely what’s happening — you’re leaving. Every buyer knows this, and every buyer is trying to work out what the business looks like without you in it.
The rule of thumb most buyers apply: if the owner can’t step away for three months without revenue declining, the business has key person dependency. That’s not a commentary on whether you’ve built a good business. It’s a structural observation about what you’ve built it around.
The people carrying the risk aren’t always the owner, either. It might be your head estimator who holds every supplier relationship. It might be your practice manager who the referring GPs actually deal with, rather than the specialist whose name is on the door. It might be the chef whose food keeps your restaurant’s TripAdvisor ratings alive. Any of these create a version of the same problem for a buyer.
How Key Person Risk Affects Your Sale Price
The valuation impact is real and it’s big. A manufacturing business in South Australia I was involved with a few years ago was generating around $900,000 EBITDA — genuinely solid numbers — but the owner was the only person who maintained the client relationships, quoted all the jobs, and knew the production process well enough to troubleshoot the unusual ones. When we ran a sale process, every single buyer came back with the same question: what happens to those relationships and that knowledge when he walks out?
The business sold for 2.8x EBITDA. With a proper management team and documented operations, that business belonged at 4x to 4.5x. The owner left roughly $1.1 million on the table (which is more than most owners realise is even at stake).
The valuation discount doesn’t always show up as a lower price. Sometimes it shows up as deal structure — a large earn-out, an extended transition at reduced salary, or conditions that require you to stay for two years and hit performance targets before you receive the full amount. That’s still you wearing the risk; it’s just packaged differently.
Most buyers in the $2M to $15M range are doing it with a combination of equity and bank debt. The bank needs to see that the cashflow supporting the loan will actually be there after you leave. A business propped up by one person’s presence doesn’t pass that test comfortably — and the buyer either walks or hedges with deal structure.
How to Identify Key Person Risk in Your Business
The six-week test is the honest one: if you disappeared for six weeks with no phone and no email, what breaks? Not what feels uncomfortable — what actually breaks. If your top clients don’t notice, your staff handles the work, and revenue holds steady, you’ve got a transferable business. If your mobile rings within a week with a client you’ve worked with for fifteen years asking where you are — that’s the problem, right there.
More systematically, key person risk clusters in four areas:
Client relationships. Do your clients deal with you, or with the business? If the relationship is with you personally — if they call your mobile, if they expect you at every meeting, if they’d consider leaving when you do — those are your clients, not the business’s. A buyer can’t buy a client relationship that only exists in your Rolodex.
Supplier and subcontractor arrangements. A lot of SME owners have informal arrangements with suppliers built on years of goodwill and personal trust. Favourable payment terms, priority allocation during shortages, discount pricing that isn’t written down anywhere. These arrangements don’t automatically transfer. A buyer inherits the legal contracts, not the relationship.
Technical knowledge. If you’re the only person who can price the complex jobs, fix the unusual problems, or deliver the high-margin work, you’re a key person whether you think of yourself as one or not. Buyers can’t buy what lives only in your head.
Management and decision-making. Does the business slow down or stop when you’re not there? Or do your managers make decisions, handle client concerns, and run operations without you in the loop? The answer tells you exactly where your business sits.
How to Reduce Key Person Risk Before Going to Market
This is the practical part — and the part most owners underestimate in terms of how long it takes. Twelve to eighteen months of genuine change is what’s needed to move the needle credibly. A folder of procedures written last Tuesday fools nobody (buyers have seen that trick before). Twelve months of the business operating profitably without your daily involvement is a different matter entirely.
Document your systems and processes. Not a 200-page operations manual nobody reads. A practical, usable set of procedures that covers how you win clients, how you price and deliver work, and how you handle the things that come up regularly. If someone could follow it and do the job, it’s good enough.
Build a second-in-command. The most valuable thing you can do for your sale price is hire or promote someone into a genuine leadership role — with real authority, not just a title. Give them six to twelve months running the business before you start a sale process. Let buyers meet them. Let them be the one who fronts the business in due diligence meetings. A capable GM with a track record does more for your multiple than almost anything else.
Shift client relationships off you. Start bringing a team member into client meetings — not as an observer, but with a genuine role. Introduce them as the account manager, the project lead, whoever fits. The goal is that when a buyer calls your top five clients during due diligence, they hear: “Nigel’s the owner, but Sarah runs our account day-to-day.” That’s what transferable looks like.
Formalise supplier arrangements. Any deal that exists as a personal understanding needs to become a written agreement before you go to market. Supplier terms, subcontractor agreements, referral arrangements — if it’s not on paper, a buyer can’t rely on it, and they’ll price for the risk that it doesn’t survive your departure. This process also surfaces dependencies you may not have been aware of.
What Buyers Test for in Due Diligence
Buyers test for key person risk indirectly, and they’re good at it. They’ll ask for an org chart and then ask what each person actually does day-to-day. They’ll ask about employee tenure, whether key staff have employment contracts, and whether anyone has already indicated they might leave after a change of ownership.
They’ll call your clients — always — and they’ll listen for what language clients use. “I work with the business” is very different from “I work with [owner’s name].” Good buyers know the difference.
They’ll also look at customer concentration. If your top client is more than 20% of revenue, that’s a flag. If that client has a personal relationship with you and no other point of contact at the business, it’s a bigger one.
The clean outcome — payment at settlement, no earn-out, no extended transition — goes to businesses that have solved these problems before the negotiation starts. Not after.
If you want to understand where your business sits right now, the EBITDA multiples guide shows what your industry typically commands at the clean end of the spectrum — and how much the multiple drops when risk factors like owner dependency are present. Our valuation calculator will give you a working estimate of where your business is priced today.
The right time to start reducing key person risk is two years before you want to sell. The second-best time is now.
Miro Capital advises Australian business owners on exit strategy and business sales. If you want a frank assessment of where your business sits on the key person risk spectrum before you go to market, reach out here.