The Reliance Ceiling: A Customer-Concentration Target for 2027

A growth target is only as sturdy as the base beneath it. For many UK SMEs, the 2027 plan looks ambitious on paper but rests on a small number of accounts. If two customers account for a third of turnover, the business does not have a diversified growth plan; it has a forecast with a single point of failure. The answer is not to stifle sales. It is to set a concentration target alongside the revenue target, and manage both with the same discipline.

Why revenue concentration understates the risk

Turnover share is the usual starting point, and it is useful. But it can flatter a business. A large account on thin margins may contribute less to overheads and profit than several smaller accounts on healthier terms. Gross profit concentration is the sharper measure because it reflects what actually funds salaries, premises and investment.

There is also forward concentration. A plan can look balanced on historic revenue while depending on one renewal or one prospective client for next year’s growth. Cash concentration matters too: if one debtor represents a large share of receivables, a late payment can distort the whole liquidity picture.

For target-setting, use three ratios: the largest client’s share of revenue, the largest client’s share of gross profit, and the largest client’s share of the 2027 forecast or weighted pipeline. Add a receivables check if the account is material. Calculate each on trailing twelve months to October or November 2026, then again on the 2027 plan. The difference between the two is the concentration risk hidden inside the growth target.

Put the baseline on one page

Use management accounts rather than annual statutory accounts. The annual view is too late and too aggregated. A simple table is enough: client name, revenue, gross profit, gross margin, forecast revenue for 2027, contracted or weighted pipeline, debtor balance and contract renewal date. Rank by gross profit, not by revenue alone.

The exercise often reveals a distinction the headline numbers miss. A client may be 15 per cent of revenue but 25 per cent of gross profit because the work is high-margin and low-overhead. Another may be 20 per cent of revenue but 10 per cent of gross profit because it is a pass-through or low-margin contract. Both facts matter, but they call for different responses.

Set a ceiling, not a wish

A concentration target should be a ceiling, not an aspiration. The growth target says what the business wants to achieve. The ceiling says what it will not let the plan become dependent on. That distinction keeps the sales conversation honest.

An illustrative set of ceilings for a UK SME might be: no single client above 20 per cent of gross profit by the end of 2027; the top three clients below 45 per cent of gross profit; and no single client above 25 per cent of cash collected. These are not universal rules. A specialist engineering firm with long-term framework agreements may tolerate a higher ceiling than a marketing agency with monthly retainers. The right level depends on contract length, switching costs, delivery capacity and the cost of replacing the account.

Set an amber trigger at 80 per cent of the ceiling. Amber does not stop growth. It forces a review: is the concentration temporary, contractual and priced for the risk, or is it becoming structural? A red breach should require a board decision and a dated remediation plan, not a quiet acceptance.

Build the growth plan around the ceiling

Once the ceiling exists, the revenue target needs to be split. Separate same-account growth from diversified growth. If the largest client grows by £200,000, that is welcome, but it should not consume the whole growth budget. Set a new-business gross profit target that excludes the top accounts. This prevents a strong year with one client from disguising a weak year in the wider market.

Pipeline concentration deserves its own limit. If more than a third of qualified 2027 pipeline sits with one prospect or one existing account, the plan is not diversified, even if the revenue spreadsheet looks balanced. Require a minimum number of new logos in the target segment each quarter, and report pipeline by account as well as by stage.

Sales incentives should reflect the ceiling. A commission scheme that rewards revenue without regard to concentration will do exactly what it is designed to do: concentrate the base. Consider a modifier that rewards new-logo gross profit, or a reduced rate on growth from accounts already above the amber trigger. The aim is not to penalise large clients. It is to make diversified growth commercially attractive.

Contract terms are part of the target. Diarise renewal dates, notice periods, price reviews and termination rights for every material account. A client that represents 20 per cent of gross profit on a rolling one-month agreement is a different risk from one on a three-year contract with indexed pricing. The ceiling should be read alongside the contract register, not in isolation.

Delivery capacity matters too. If the largest client absorbs the best people and the most management attention, the business cannot diversify even if it wants to. Ring-fence capacity for new accounts and monitor utilisation by client. A concentration target that ignores operations is merely a finance exercise.

Measure monthly, review quarterly

Add the concentration ratios to the monthly management pack. Report the ceiling status, new-logo gross profit, pipeline concentration, top-client gross margin and debtor share. Review the pack in the monthly leadership meeting and the full position quarterly with the board.

The most useful test is the loss scenario. If the largest client disappeared on 1 January 2027, what would happen to revenue, gross profit, cash and delivery capacity? If the answer requires an emergency plan, the concentration ceiling is not tight enough or the remediation plan is not credible.

The discipline of saying no carefully

A concentration ceiling is not an argument for refusing large clients. It is an argument for pricing, contracting and planning for the dependency they create. If a significant deal would breach the ceiling, approve it deliberately, with a diversification plan and a date by which the ratio returns within limit. That is different from drifting into dependence because the sales target only measured revenue.

For 2027, put the concentration ceiling on the same page as the growth target. A plan that widens the customer base is more durable than one that narrows it. Growth should make the business stronger, not merely larger.