1. Start with Revenue, but Don’t Stop There
Revenue is usually the first place people look, and rightly so. Review your customers over the last 6–12 months and ask:
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Who brings in the highest consistent revenue?
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Which customer types make repeat purchases?
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Which contracts or clients last the longest?
However, high revenue alone doesn’t always equal high profitability. A customer may pay well but require excessive discounts, revisions, or operational effort. That’s why the next step matters just as much.
2. Factor in Cost and Effort
Profitability is revenue minus the cost of serving the customer.
Consider:
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Time spent managing the customer.
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Staff involvement required.
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Customization or special handling.
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Payment delays or follow-ups.
Often, businesses discover that some smaller clients are actually more profitable because they:
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Pay on time.
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Require less supervision.
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Fit smoothly into existing processes.
Your most profitable segment is usually the one that allows your business to run calmly and efficiently—not constantly in firefighting mode.

