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At KAAS Kildare Audit we believe that strong sales are only one part of building a financially resilient business. An SME can have an excellent relationship with a major customer or a highly successful product, but relying too heavily on one source of revenue can leave the business exposed when circumstances change. Understanding concentration risk and taking steps to reduce it can help protect long-term stability and growth.

When success creates a financial risk

Having a major customer is often a positive development. A large contract can provide predictable revenue, support employment and give a business the confidence to invest.

The risk arises when that customer becomes responsible for a disproportionate share of total income.

The same applies to revenue streams. A business may become heavily dependent on one product, service, market or sales channel because it has performed particularly well.

There is nothing inherently wrong with having a leading source of revenue. The concern is what would happen if that source suddenly weakened or disappeared.

A useful question for any SME owner is simple: If our largest customer or most important revenue stream disappeared tomorrow, how long could the business continue operating?

The answer can reveal a level of financial exposure that may otherwise go unnoticed.

The impact of losing a major customer

The immediate consequence of losing a major customer is reduced turnover. The wider impact can be considerably greater.

A business may have employees, premises, equipment and supplier commitments that were supported by the revenue generated from that customer. These costs may remain even after the income disappears.

There can also be a knock-on effect on cash flow.

If the business has invested in additional capacity to service the customer, it may suddenly find itself carrying costs that are no longer matched by revenue.

This is particularly important for SMEs with relatively high fixed costs. A significant reduction in sales can have a much greater impact on profitability than the percentage reduction in turnover might suggest.

Revenue concentration can affect business value

Customer concentration can also become relevant when an owner is considering selling the business or bringing in investment.

A potential buyer may question the sustainability of earnings if a large proportion of turnover comes from one customer.

The concern is straightforward. If the customer leaves after the transaction, the financial performance of the business could change significantly.

This does not mean that a business with a major customer cannot be attractive. Long-term contracts, strong relationships and high customer retention can provide reassurance. However, reducing dependence on individual customers can make the underlying business more resilient and potentially more attractive.

One product can create a similar problem

Customer concentration is not the only issue.

Imagine an SME where one product generates 70% of total sales. If a competitor launches a cheaper alternative, customer preferences change or the cost of producing that product increases significantly, the business could face considerable pressure.

The same principle applies to a particular market or sales channel.

For example, a business that relies heavily on one online marketplace, referral source or geographic market could find its revenue affected by changes outside its control.

The more concentrated the revenue base, the more important it becomes to understand the potential consequences of disruption.

Five ways to reduce concentration risk

1. Measure where your revenue actually comes from

Start with the numbers.

Review your revenue by customer, product, service, market and sales channel. You may discover that your business is more concentrated than you realised.

Look at both current figures and trends over time. A customer that represented 20% of revenue three years ago may now represent 40%.

2. Set realistic diversification targets

Diversification does not mean trying to acquire as many customers as possible.

A better approach is to identify areas where the business could gradually develop additional sources of sustainable revenue.

This might involve targeting a new customer segment, developing another service, entering a new geographic market or strengthening an underperforming sales channel.

The focus should remain on profitable revenue rather than turnover for its own sake.

3. Understand the profitability of major customers

A large customer is not automatically a highly profitable customer.

Review the revenue generated alongside the time, staffing, discounts, support and other costs associated with serving that customer.

A customer responsible for a significant percentage of turnover may contribute a much smaller percentage of profit.

This analysis can help determine whether your business is taking on excessive exposure without receiving an appropriate return.

4. Protect important relationships

Reducing concentration risk does not mean neglecting your largest customers.

Strong relationships remain valuable. Regular communication, service reviews and a clear understanding of customer needs can help improve retention.

Where appropriate, longer-term agreements can also provide greater visibility over future revenue, although the commercial and financial terms should be considered carefully.

5. Build financial resilience

Diversification takes time.

In the meantime, businesses should consider whether they have sufficient cash reserves, access to finance and cost flexibility to cope with a significant fall in revenue.

Scenario planning can be particularly useful.

What would happen if your largest customer reduced orders by 25%?

What if they stopped trading with you altogether?

What if your most profitable product experienced a significant decline in demand?

Working through these scenarios can highlight areas where action is needed.

Growth should not increase your exposure

There is a temptation to focus heavily on a successful customer or product because it is generating strong results.

Growth can then reinforce the concentration.

A business may hire more employees, purchase equipment or expand premises to support one major contract. If that contract later ends, the company can be left with a cost structure designed around revenue that no longer exists.

This is why growth should be assessed in terms of resilience as well as turnover.

A diversified revenue base may grow more slowly in some circumstances, but it can provide greater protection when individual customers, markets or products experience difficulties.

Look beyond turnover

Revenue concentration is ultimately a risk management issue.

Every SME should understand where its income comes from, how profitable those sources are and what the consequences would be if one of them changed significantly.

At KAAS Kildare Audit, we believe that sustainable growth involves building a business that can withstand change. Reviewing customer and revenue concentration regularly can help identify vulnerabilities while there is still time to address them.

If you would like to discuss your business, contact us by email reception@kaas.ie or visit kaas.ie.

Disclaimer

This article is based on publicly available information and is intended for general guidance only. While every effort has been made to ensure accuracy at the time of publication, details may change and errors may occur. This content does not constitute financial, legal or professional advice. Readers should seek appropriate professional guidance before making decisions. Neither the publisher nor the authors accept liability for any loss arising from reliance on this material.