What to Do When You Lose Your Biggest Client: How We Lost 45% of Our Revenue Overnight
When one client or partner makes up a large share of your revenue, your business is built on their decisions, not yours. If they change direction, you can lose a huge piece of the business overnight. Protect yourself before it happens: know how much of your revenue depends on any one relationship, put a limit on it, and build a second and third source of work while things are still good.
I started my last company with $500 in my pocket. Within three years we had crossed a million dollars in revenue, and within three more we were hitting it every year.
By 2021 the business was riding high. That same year, I invested in building a piece of software and partnered on it with an agency we had worked closely with for four years. They weren't a new relationship. They were people we trusted, and a big part of our work ran through them.
What happened
By November of 2022, at the tail end of a record revenue year, that agency shifted its commitments and walked away from the software project.
The effect of that one change in direction caused my company to lose 45% of its revenue, practically overnight.
There wasn't a slow decline I could see coming, or a warning sign I could point to in the numbers. One partner made a decision for their own business, and nearly half of mine went with it. We had to shrink the team and rebuild with the key people who remained.
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The real problem wasn't the agency
It would be easy to tell this story as a betrayal. A partner we had worked with for four years walked away, and we paid for it.
But that's not really what happened. They made a decision that made sense for them. The problem was that I had built a large part of my business on a foundation I didn't control.
When one relationship carries that much of your revenue, you're not running your business. You're running theirs, and you're one decision away from finding that out.
Why this happens to good businesses
This almost never happens to businesses that are doing badly. It happens to businesses that are doing well.
A big client or partner shows up, the work is good, the money is reliable, and it's easy. They send more, you say yes, and over time a bigger and bigger share of your revenue flows through one door. Nothing about it feels risky, because the relationship is strong and the numbers keep going up.
That's exactly what makes it dangerous. The more comfortable the relationship feels, the less likely you are to notice how much of the business depends on it.
It shows up in service businesses all the time. A contractor gets most of their jobs from one builder. A marketing firm has one client paying half the bills. A clinic gets most of its new patients from a single referral source. A consultant lives off one long-term contract. Every one of those can be great, right up until it isn't.
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See Club SoloHow much is too much from one client?
There's no perfect number, but here's a simple test. If any one client or partner disappeared tomorrow, could you cover your payroll and your bills for the next three months without panicking?
If the honest answer is no, that relationship is carrying too much of your business.
A lot of advisors use a rough line of around 20 to 25% of revenue from any single source. Below that, losing them hurts. Above it, losing them can put the whole business at risk. Wherever you draw the line, the important thing is to actually know your number, because most owners don't.
How to protect your business before it happens
Know your concentration. List your clients and referral sources and what percentage of revenue each one brings in over the last twelve months. Most owners are surprised by how much depends on one or two names.
Set a limit and watch it. Pick the share you're comfortable having tied to any one relationship. When someone starts creeping past it, that's your signal to build other work, not to turn them away.
Build your next source while things are good. The time to find new clients and new channels is when your biggest one is happy, not after they leave. When you're desperate, every decision gets worse.
Own the work, not just the relationship. If something important to your business, like a product, a system or a pipeline of leads, depends on a partner's commitment, make sure you understand it well enough to keep it running if they walk away.
Keep a cushion. Cash reserves don't prevent the loss, but they buy you time to rebuild without making panicked decisions.
What I'd do differently
Looking back, I don't regret the partnership. It was a good relationship for a long time, and a lot of good work came out of it.
What I'd change is how much I let ride on it. I'd have known exactly what share of our revenue it represented, I'd have built other sources while it was going well, and I'd have made sure the software we were investing in didn't depend on someone else's commitment to survive.
You can't control what your biggest client or partner decides. You can control how much of your business you let them hold.
Frequently asked questions
What should I do right after losing my biggest client?
Get clear on the numbers first: how much revenue is gone, how long your cash will last, and which costs you can cut without hurting the work. Then go straight to your best remaining clients and warmest leads, because the fastest new revenue usually comes from people who already know you.
How much revenue should come from one client?
Many advisors suggest keeping any single client or partner under roughly 20 to 25% of revenue. More important than the exact number is knowing yours and having a plan if it grows past your comfort level.
Is it bad to have one big client?
Not on its own. A big client can be a great foundation for growth. It becomes a risk when you stop building other work because that one relationship feels safe.
How do I reduce client concentration without turning away work?
Keep serving the big client well, and put deliberate effort into new clients and new referral sources every month. You're not shrinking the big one. You're growing everything else.
If too much of your business depends on one relationship, that's one of the first things we look at in the Next Level Sprint: five sessions, one on one, within ten days.
Start the Sprint$500. Full refund if the first session isn't for you.
Dave Zaron has spent 16 years building the systems behind high-stakes launches, including the infrastructure for #TeamSeas, the $30M campaign led by MrBeast and Mark Rober. He helps service business owners who've hit a plateau see exactly what's keeping them stuck.
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