What is a healthy level of customer concentration?

There is no single rule, but a common guide is that no single customer should represent more than 10% of your receivables. Above 25% in one customer is generally treated as high risk, because a default by that customer would put a large share of your ledger at risk. The right level depends on your margins and cash buffer.

Why is concentrating receivables in a few customers risky?

If a large customer pays late, disputes an invoice, or becomes insolvent, the impact on your cash flow is proportional to how much they owe you. A business with one customer owing 30% of its receivables is far more exposed to a single failure than one whose receivables are spread evenly across many customers.

How can I reduce debtor concentration risk?

Diversify your customer base so no single account dominates, set and enforce credit limits for large customers, shorten payment terms or require deposits on high-value accounts, and consider trade credit insurance. Acting early on overdue large balances is critical — Merion can pursue them on a commission-only basis.

Free tool

Debtor Concentration Risk Calculator

If a handful of customers owe you most of your money, a single late payment or insolvency can put real strain on your cash flow. This calculator shows what share of your receivables is tied up in your largest customers and gives you a simple risk band, so you can see where to tighten credit limits.

Receivables details

Total receivables (AUD)

The total amount currently owed to your business across all customers.

Customer 1 (largest balance)

Customer 2

Customer 3

Customer 4

Customer 5

Enter your five largest customer balances, ordered from largest to smallest. Leave any unused fields blank or zero.

What customer concentration tells you

Customer concentration measures how much of your outstanding receivables sit with a small number of customers. A figure of 25% or more in a single customer is generally treated as high risk: if that one account fails to pay, a quarter of your ledger is at stake. Between 10% and 25% is moderate, and below 10% is low.

These bands are indicative. The right threshold for your business depends on your margins, cash buffer, and how quickly you could absorb a default. Use the figure as a prompt to review credit limits, not as a hard rule.

This calculator is for illustrative purposes only — not financial, accounting, or legal advice. Risk bands are general guidance and do not account for your specific circumstances. Seek professional advice before making credit or provisioning decisions.

Why customer concentration is a hidden risk

Most businesses watch their total receivables closely but rarely look at how those receivables are distributed. Two businesses can be owed the same amount, yet have very different risk profiles: one with the balance spread across fifty customers is far safer than one where a single customer owes a third of the ledger. When too much is concentrated in a few accounts, the failure of just one customer can wipe out a large slice of your expected cash, sometimes more than your profit margin on the work.

What the risk bands mean

This tool flags your exposure based on the share held by your largest customer. A largest-customer share of 25% or more is treated as high risk, 10% to 25% as moderate, and below 10% as low. The top-3 and top-5 figures add context: if your top five customers account for the bulk of your ledger, your business is effectively reliant on a small group continuing to pay on time. These thresholds are general guidance, not a substitute for judgement about your own margins and cash position.

Turning the number into action

A high concentration figure is a prompt, not a verdict. The usual responses are to diversify the customer base over time, set firm credit limits on your largest accounts, shorten terms or take deposits where the balance is significant, and consider trade credit insurance. Above all, act quickly when a large customer drifts into arrears — the longer a concentrated balance stays overdue, the more damage a default does. If a major customer has stopped paying, Merion pursues commercial debts on a commission-only basis, so you can chase a large balance without adding fixed cost.

This is an indicative calculation only — not financial, accounting, or legal advice. The risk bands are general guidance and do not account for your specific circumstances, margins, or sector. Seek professional advice before making credit, provisioning, or insurance decisions.

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Don't let one big customer sink your ledger.

Commission-only recovery — no recovery, no fee. We pursue large overdue balances so a single default doesn't put your cash flow at risk.

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