A single customer representing 35% of revenue might be your most valuable relationship — or your biggest vulnerability. To understand customer concentration risk, business owners should examine how much revenue, gross profit, outstanding receivables, and operating capacity depend on individual customers.
What Is Customer Concentration Risk?
Customer concentration risk is the exposure a business faces when a large share of its revenue depends on a single customer or small number of customers. Losing any one of those customers, renegotiating contracts, or delayed collection of its invoices can meaningfully impact a business’s earnings, liquidity, and sustainability.
Four Ways To Calculate Customer Concentration
There are multiple ways to measure customer concentration, including revenue concentration, profit concentration, and capacity concentration. Below are four ways to calculate customer concentration:
1. Revenue concentration
To calculate client revenue concentration, divide customer revenue by total revenue. For example, if a customer generates $760,000 of a company’s $2 million in total annual sales, revenue concentration is 38%. This is the first concentration metric to start with, and then you can compare the top three to five customers.
2. Gross profit concentration
Gross profit concentration is equal to a customer’s gross profit divided by the business’s total gross profit. This is a good metric to consider because revenue doesn’t take into account differences in pricing, discounts, or service costs. A customer responsible for 38% of sales might contribute 52% of gross profit. Losing that relationship could therefore be more damaging than its revenue share suggests.
3. Accounts receivable concentration
Accounts receivable concentration is a customer’s total outstanding receivables as a percentage of the business’s total accounts receivable. A customer accounting for 61% of receivables may create substantial collection and liquidity exposure, even if its revenue share is lower. After measuring concentration, also review customers’ receivables aging and payment behavior — not just the balance on a given date.
4. Capacity concentration
Capacity concentration measures the percentage of a business’s total resources that are used for a single customer. To calculate capacity concentration, divide the value of resources dedicated to a single customer by total relevant operating capacity. A large customer that occupies 45% of available capacity can limit your ability to serve others.
For each of these metrics, it’s best to calculate concentration not just for individual customers, but also to calculate them in aggregate for a company’s three to five largest customers. That way you can tell how reliant your business is not just on a single relationship, but on a small subset of customers.
An Example of Customer Representing Different Risks
Suppose Client A represents 38% of revenue, 52% of gross profit, and 61% of receivables, while consuming 42% of delivery capacity. To start, each of these concentrations is too high for a company trying to build a diversified, sustainable business.
In this case, Client A’s contribution to profit is notable, but a delayed payment could create immediate cash pressure, and a contract loss could not only significantly hurt the business’s bottom line but also leave substantial operating capacity unused. Each of these are different risks that require different responses.
When Does Customer Concentration Become a Problem?
Customer concentration risk is relative — there’s no single percentage at which concentration becomes unacceptable. A business that uses multi-year contracts and has predictable renewals and a prompt payment history differs substantially from a business that relies on month to month purchases with volatile demand.
When considering these metrics, ask how replaceable the revenue is, whether the customer has pricing leverage, how long it would take to redeploy capacity if you lose a customer, and whether the company could survive a sudden loss.
How To Reduce Customer Concentration Risk
If you think your customer concentration risk is too high and needs to be reduced, start by modeling what happens if your largest customer reduces its purchases by 25%, pays 30 days late, or stops buying altogether.
Estimate the impacts of these changes on gross profit, collections, staffing, and fixed-cost coverage. Then, decide whether to diversify into new customer segments, improve contract terms, adjust credit limits, build a cash buffer, or reduce dependence on customer-specific resources. Each of these steps has costs, so evaluate the economics of replacing concentrated revenue rather than pursuing smaller customers indiscriminately.
How Often Should You Review Customer Concentration Risk?
Concentration risk is a worthwhile metric to measure in any business, but it doesn’t help if you only measure it once. Start by reviewing the largest customers monthly or quarterly, and after major contract changes. Track trends along with customer profitability, receivables aging, renewal dates, and capacity utilization. A concentration percentage that remains stable can still become riskier if payments are late or the relationship breaks down.
The Bottom Line
Concentration risk isn’t one metric, nor is it solely sales-focused. Customer concentration is a way to understand a business’s earnings, cash, and operating flexibility and how they depend on a small number of relationships.
If you want to learn more about how reliant your business is on one or a few customers, or how to reduce the risks inherent in relying on a small number of customers, book a free consultation. We’ll review your business and review ways for you to measure and address risk.
