Key person risk is the single most common reason Australian small businesses sell for less than their owners expected — and the owners never saw it coming. It means the business depends on one person to function: usually the founder, the managing director, or a senior specialist whose departure would cause immediate revenue loss. In Australia’s SME market, that person is almost always the seller. Buyers discount the purchase price, sometimes by hundreds of thousands of dollars, to reflect the risk they’re taking on.
Most business owners don’t think they’re key-person dependent. They’re wrong. If a buyer asked your ten largest clients “who do you deal with?”, and the answer was your name, you have a problem.
What Is Key Person Risk in a Business Sale?
Key person risk is the risk that a business’s value is tied to the continued involvement of a specific individual. In the context of selling, that means a buyer is paying for a business that may not function at the same level once the seller exits.
The risk shows up in four ways: client relationships held by the owner personally; operational knowledge that exists only in the owner’s head and is undocumented; sales revenue generated primarily through the owner’s network; and internal management capacity where the owner makes every meaningful decision.
A useful rule of thumb: if the business cannot operate for four weeks without you present, you have material key person risk. Most buyers will find this out within the first two hours of due diligence.
How Buyers Assess Key Person Risk During Due Diligence
Buyers and their advisers look for key person risk methodically. They’re not guessing — they’re working through a checklist, and the signals are easy to read.
The first is customer concentration. If you have ten clients and three of them call your mobile directly and have never met anyone else at your business, that’s a flag. Buyers will ask for customer contracts, correspondence records, and sometimes a list of who the primary contact is for each client relationship.
The second is management depth. A buyer will ask who runs operations when you’re away, who handles complaints, who makes hiring decisions. If the answer is “me” to most of these questions, they’re noting that the management team can’t replace the owner — which is a discount.
The third is documentation. Businesses with written procedures, staff training systems, and documented client onboarding processes are demonstrably less dependent on any one person. Businesses where the process lives in the owner’s head are priced accordingly.
I worked with a Perth engineering consultancy that had genuinely excellent margins — $1.1 million normalised EBITDA — and should have sold for somewhere around $4.5 million based on industry comparables. The buyer’s due diligence revealed that the owner had personal relationships with six of the eight anchor clients, had signed every proposal himself for the past eight years, and there were no written procedures for project delivery. The offer that came through was $2.8 million, based on a 2.5x multiple. The owner was devastated. He’d spent twenty years building something, and the buyer was pricing as though half of it was leaving with him. Which, frankly, it was.
How Key Person Risk Affects Your EBITDA Multiple
The quantifiable impact of key person risk sits in your EBITDA multiple — the number applied to your normalised profit to arrive at a sale price. Refer to the EBITDA multiples by industry guide for the baseline ranges.
A well-run trade business in Australia typically sells at 3x–4x normalised EBITDA. Add significant key person risk and that multiple compresses to 2x–2.5x. On $800,000 EBITDA, that’s the difference between a $3.2 million sale and a $2 million sale. Same profit; different story.
The rule of thumb in the M&A market: every meaningful risk factor in a business reduces the multiple by 0.25x–0.5x. Key person risk, high customer concentration, undocumented systems, and no management team are four of the most common. A business that carries all four simultaneously is trading at the floor of its industry range — if it sells at all.
Professional services businesses — accounting practices, law firms, marketing agencies — tend to have the highest inherent key person risk because the owner is often the expertise. Healthcare businesses with a single practitioner face the same challenge. Trade businesses, retail, and businesses with recurring contract revenue tend to have lower key person risk by nature, though owner habits can still create it.
How to Reduce Owner Dependency Before You Sell
The good news is that key person risk is largely fixable. The less good news is that it takes time — typically twelve to twenty-four months to do properly. If you’re planning to sell in six months, you can still make meaningful progress, but don’t expect to close the discount entirely.
Reducing owner dependency means systematically moving knowledge, relationships, and decision-making authority out of your head and into the business structure. This overlaps significantly with the steps covered in the guide to increasing business value before selling.
Start with the client relationships. Introduce your senior staff to your key accounts. Have them run the quarterly reviews, handle the routine queries, and be the first point of contact for day-to-day issues. Your clients don’t need to forget you — they just need to have a relationship with someone else at the business too. Do this over twelve months and it’s genuine. Do it in the three weeks before due diligence and buyers will see straight through it.
Then document your systems. This doesn’t need to be a management consultant’s dream deliverable. A clear set of written procedures covering your most common processes — quoting, onboarding, project delivery, complaints — demonstrates that the business can be replicated without you. It also makes the business easier to run after sale, which buyers value.
Hire into management. If every significant decision comes through you, a buyer is buying a full-time job, not a business. An operations manager, a sales lead, or a client services director who can hold the business together during transition adds real value. Factor this into your exit planning (the business exit planning guide covers the timeline in detail).
Build recurring revenue where you can. Clients on retainer agreements, service contracts, or subscription pricing are less susceptible to owner-departure risk than project-by-project clients. A buyer paying 4x EBITDA on contract revenue is more comfortable than a buyer paying 4x on relationship-dependent project revenue.
What Buyers Actually Want to See
When buyers or their advisers assess key person dependency in due diligence, they’re not just looking for problems — they’re looking for evidence that the problem has been addressed. The due diligence checklist for selling a business lists what buyers typically request.
Specific evidence that reduces the key person discount:
A management team with defined responsibilities. An org chart is a start; a management team that actually makes decisions is better. Ask yourself whether your management team could handle a month without you — then be honest about the answer.
Written client contracts that transfer on change of ownership. Personal relationships are less of a risk when underpinned by documented commercial agreements. A client who has a contract with the entity (not with you personally) is a more transferable client.
Revenue data by relationship. If you can show a buyer that your ten largest clients are distributed across three different team members, that’s a meaningful demonstration of spread. If all ten call your mobile, that’s the opposite.
Documented systems and training materials. Even basic procedure documents for your most common tasks demonstrate institutional knowledge rather than personal knowledge.
These aren’t just cosmetic improvements. They are the underlying conditions that allow a buyer to believe the business will perform after you leave — which is, ultimately, what they’re paying for. Understanding what buyers look for when buying a business helps you anticipate what will come up.
Key Person Insurance: Does It Help in a Sale?
Key person insurance protects the business during a transition if a critical person becomes incapacitated or dies. It’s worth having, and it does provide some comfort to buyers during a transition period. But it doesn’t fix the underlying structural problem — a business that can’t function without its owner.
Buyers don’t pay a higher multiple because the seller has key person insurance. They pay a higher multiple because the business has demonstrated it can operate without the owner. Insurance is a risk management tool for the transition period; it’s not a substitute for genuine operational independence.
If a buyer raises key person insurance during negotiations, treat it as a signal that they’ve identified the dependency and are trying to price it. The right response is to address the dependency, not to use the insurance as a conversation-stopper.
Key person risk isn’t a character flaw — it’s an almost universal feature of owner-operated businesses in Australia. The owners who get the best prices are simply the ones who spent the eighteen months before sale systematically reducing it.
If you want to understand what your business is worth today — and what changes would have the biggest impact on your multiple — the Miro Capital valuation calculator is a reasonable starting point. Or get in touch if you’d like to talk through what a sale process would look like for your specific situation.
Frequently Asked Questions
What is key man risk in the context of business?
Key man risk is the risk that a business’s revenue and operations depend heavily on one person — usually the owner. If that person left, customers would follow or operations would falter. Buyers discount the purchase price to compensate for this risk, typically by reducing the EBITDA multiple applied.
What is the formula for valuing a business to sell?
Most Australian SMEs are valued using normalised EBITDA multiplied by an industry multiple. A trade business generating $600,000 EBITDA at a 3.5x multiple is worth $2.1 million. Key person risk can reduce that multiple by 0.5x to 2x, directly cutting the sale price.
How many times profit is a business worth?
Most Australian small businesses sell for 2x–5x normalised EBITDA. Businesses with low owner dependency attract the upper end of the range. Those where the owner runs all client relationships and key decisions typically sell at the lower end, or find it difficult to sell at all.
What are the tax implications of selling a business in Australia?
Australian business owners may qualify for small business CGT concessions, including the 15-year exemption, active asset reduction, and retirement exemption. The concessions depend on business structure, asset test, and turnover. A sale at a discounted price due to key person risk directly reduces your pre-tax proceeds.
How much is a business worth with $5 million in sales?
Revenue alone doesn’t set the value. A $5 million-revenue business with strong margins, recurring contracts, and low owner dependency might sell for $3 million–$5 million. The same revenue with thin margins and an owner who is the primary client contact can be worth significantly less, or be very difficult to sell.