The account is valuable. That does not make every request sensible.
A major customer wants another exception. A lower price. A faster turnaround. A different reporting process. You agree because losing them feels worse than saying yes.
At some point, the account can start setting the operating model for the entire business. The question is not whether large customers are bad. It is whether you still understand and control the trade-offs.
Build four views of dependence
Start with the account's share of revenue over a representative period. Then calculate its contribution before shared overhead using a clear cost method. Review outstanding payments and work already committed. Finally, identify people, equipment or processes dedicated to the customer.
A revenue share alone misses important differences. An account producing 30% of revenue might fund 50% of the contribution. Another might occupy most capacity while contributing little. The response will differ.
Use the ranked customer view in the 80/20 lesson, but do not assume a numerical concentration threshold is safe for every business. Contract length, notice, margins and alternatives all matter.
An illustrative stress test
A business has monthly revenue of $100,000. Its largest customer contributes $45,000. Direct costs attributable to that work are $27,000, leaving $18,000 before shared overhead.
Losing the account does not necessarily remove $45,000 of profit. Equally, it may not release all $27,000 of costs immediately. Staff commitments, leases and work in progress can remain. Model the timing instead of subtracting a percentage from a single total.
Run a second case where the customer stays but pays thirty days late. The revenue picture is unchanged while cash needs increase. Cash-flow guidance emphasises the timing of money moving through the business.
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Do not punish the customer for your dependence
The answer is not an abrupt price increase or poor service. Review scope, service effort and expectations using evidence. Explain what the business can deliver reliably. Put exceptions through a clear approval process rather than allowing whoever answers the phone to absorb the cost.
Build more than one useful relationship within the account where appropriate. Understand their priorities and procurement arrangements. Do not mistake personal warmth with one contact for an enduring commercial commitment.
Create options before you urgently need them
Diversification takes work. Identify customer groups the business can serve using existing strengths. Test an offer with a small number of suitable prospects. Check contribution and capacity, rather than replacing one difficult account with ten equally unsuitable ones.
Also improve the transferability of account knowledge. Keep agreed scope, key contacts, delivery requirements and open issues in a shared record. An account dependent on your memory adds a second concentration risk: you.
Make the next decision visible
At the next account review, distinguish relationship health, commercial fit and dependency. These are different questions. A happy customer can still create a risk through concentration. A profitable account can still require unreasonable service commitments.
Choose one improvement with an owner. It might be a clearer scope, earlier collection follow-up, better handover or a small diversification test. Review whether dependence has genuinely reduced, not whether a new prospect list has been created.
Look behind your largest accounts
Use one row per account: anonymous label, revenue, direct service cost in AUD. These are fictional starting figures.
This calculation runs in your browser. Nothing entered here is sent to Greg or the website. Use anonymous labels. Results illustrate the stated assumptions, not a forecast or personal advice.
Your next action
Review your five largest accounts using revenue, direct costs, receivables and dedicated effort. Build a loss scenario and a delayed-payment scenario for the largest. Choose one relationship improvement and one practical way to create an alternative source of suitable work.
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Lesson: Customer concentration: when the biggest account controls your decisions. Please do not include confidential client, financial, health or staff information.
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