Friday, October 30, 2026

If your business stops the moment you do, the problem isn't your team. It's how many of their problems you're still quietly carrying. Here's the fix, from a 1974 HBR classic.

Ask most SME owners how much of their revenue comes from their single biggest customer, and you'll get a rough guess, usually followed by "but we're fine, they've been with us for years." That's precisely the sentence owners said about the customer who left.

US accounting standards (ASC 280-10-50-42) require public companies to separately disclose any customer that makes up 10% or more of revenue — not because 10% is inherently dangerous, but because regulators decided that's the threshold worth telling investors about. SME owners rarely have to disclose anything to anyone, which is exactly why customer concentration quietly becomes someone else's problem to notice — usually a bank, a buyer, or an owner's own cash flow, at the worst possible moment.

The Math Most Owners Never Actually Run

Run it once and it's uncomfortable in a way no survey needs to prove. A business with four roughly equal customers loses 25% of revenue the day one leaves. A business with one customer at 40% of revenue loses almost half overnight — not because the market turned, not because the team underperformed, but because one phone call happened. That's not pessimism. It's arithmetic every SME owner is running without realising it, every day they don't check the number.

Three Moves That Actually Reduce the Risk

  • Know the real number today. Calculate what percentage of the last twelve months' revenue your top one, three and five customers represent — not a guess, the actual figure.
  • Set a written cap for any single customer. Most advisers land somewhere between 15% and 25%, depending on how replaceable that revenue would be. Treat any new deal that would breach it as a conscious decision, not an accident.
  • If you're already over the cap, grow everyone else faster. The fix isn't firing the big customer — it's a genuine new-customer push, not just servicing the big account even better.

"I have grown my business 5x since working with Kevin. Everything Kevin told me to do was the complete opposite of what I had been doing. Working with Kevin has truly been a complete game changer."

— Richard, Chem Suppliers

Why Owners Who Know This Still Haven't Run the Number

The biggest customer is usually also the easiest revenue — the one that doesn't need chasing, the one where the relationship already exists. Deliberately spending time and money on smaller, harder customers to dilute dependence on the easy one feels like working against your own instincts. It is, which is exactly why most owners need someone outside the relationship to make the case for diversifying before the easy customer makes the decision for them.

Key Takeaways

  • Calculate your top one, three and five customers' real share of last year's revenue.
  • Set a written concentration cap, typically 15–25%, and treat breaches as a decision, not a drift.
  • Grow the rest of your customer base deliberately if you're already over the cap, rather than deepening the dependency.
  • Get an outside view — the easy customer is the hardest one to diversify away from on your own.

If you can't say your top customer's share of revenue to the nearest 5% right now, that's the first number we find together.

Monday, October 26, 2026

A well-known coaching ROI study found a $7.90 return per $1 spent. Here's an honest look at where that number comes from, and what actually transfers to an SME owner.

Monday, October 26, 2026

Only around 20% of companies complete 80% of their strategic goals, and fewer than half of employees know what's expected of them. Here's how OKRs fix that at SME scale.

Monday, October 26, 2026

Bain research shows winning a new customer can cost up to 25 times more than keeping one you already have. Here's the CLV/CAC discipline that flips where your sales effort goes.

Monday, October 26, 2026

A 2026 Gartner survey found SMEs put just 12% of marketing spend into brand-building, against the 60% long-term research recommends. Here's what that costs you eighteen months from now.

Monday, October 26, 2026

Fewer than 5% of employees understand their company's strategy well enough to act on it. Here's the one-page scorecard that fixes it, reviewed in 15 minutes a week.

Sunday, October 25, 2026

Help to Grow: Management, a peer group like Vistage, or a business coach? An honest UK comparison, with best for and not ideal if for every option.

Sunday, October 25, 2026

Free and low-cost mentoring suits some NZ owners; paid coaching suits others. Here is how to tell which fits your stage, your problem and your budget.

Sunday, October 25, 2026

Most SME owners know their follower count, not where their last ten paying customers actually came from. Here is the 2026 data on what really drives growth.

Sunday, October 25, 2026

ANZ's September 2026 survey shows NZ business confidence easing again. Here's the trap that data creates for SME owners, and how growth-minded owners should read it instead.

Sunday, October 25, 2026

More people call themselves a business coach than ever before. Here's the one test that actually separates a coach who gets results from one who just talks.

Sunday, October 25, 2026

A 2024 study found SME owners lose 22% of their working week to admin and compliance. Here's the task-level AI audit that claws the time back without hiring anyone.

Sunday, October 25, 2026

Seller-initiated deals close at nearly double the rate of buyer-initiated ones. Here's why proactive selling beats waiting for inbound, and how to shift the ratio.

Sunday, October 25, 2026

The best customer-acquisition channel most SME owners ignore isn't an ad platform — it's the audience someone else already spent years building. Here's how to borrow it properly.

Sunday, October 25, 2026

Most strategic plans don't fail in June — they fail the day they're signed off, while everyone still feels confident. Here's the one-page exercise that catches the fatal flaw first.

Saturday, October 24, 2026

79% of SME owners can't make a strategic plan stick, and it's not an ambition problem. Here's the one-page fix that turns an annual plan into a system you actually use every week.