Margin leakage is a term that does not appear on any financial statement. But it is one of the most important concepts for any NZ business owner who wants to understand why their business is not as profitable as it should be.

Simply put, margin leakage is the gap between the profit your business should be generating — based on your pricing, your volume, and your cost structure — and the profit it actually generates. It is the money that slips through the cracks.

Every business has some margin leakage. The question is how much, where it is coming from, and whether it is being actively managed.

Why Margin Leakage Matters

A business with $2 million in revenue and a target gross margin of 40% should generate $800,000 in gross profit. If the actual gross margin is 34%, the business is generating $680,000 — a $120,000 shortfall.

That $120,000 is not going anywhere useful. It is being absorbed by costs that are higher than they should be, revenue that is lower than it should be, or inefficiencies that are consuming resources without generating value.

At a 3× EBITDA multiple, $120,000 in annual margin leakage represents $360,000 in lost business value. This is not a theoretical number — it is the direct impact on what a buyer would pay for the business.

The Main Sources of Margin Leakage

1. Pricing Gaps

Pricing gaps occur when the price charged does not reflect the true cost of delivering the work plus a reasonable margin.

Common causes include:

• Quoting based on estimated costs that are consistently lower than actual costs
• Not updating prices when input costs increase
• Discounting as a default response to customer pushback
• Pricing all customers the same when some require significantly more time and effort
• Not charging for scope changes, variations, or additional work

Pricing gaps are particularly common in trades and project-based businesses, where the gap between quoted and actual costs can be significant and is rarely tracked systematically.

2. Direct Cost Overruns

Direct cost overruns occur when the actual cost of delivering a job or product exceeds the estimated cost. This is different from a pricing gap — the price may be right, but the costs are higher than expected.

Common causes include:

• Labour inefficiency (jobs taking longer than estimated)
• Material waste or procurement at higher-than-expected prices
• Subcontractor costs exceeding quotes
• Rework and defects consuming additional labour and materials
• Scope creep that is not captured in additional charges

Without job costing — tracking actual costs against estimates for each job — direct cost overruns are invisible. They show up as a lower-than-expected gross margin, but the specific cause is unknown.

3. Revenue Leakage

Revenue leakage occurs when work is done but not fully invoiced. This is more common than most business owners realise.

Common causes include:

• Variations and additional work that are completed but not charged
• Time spent on client communication, travel, and administration that is not billed
• Discounts given informally by staff without authorisation
• Invoices that are not sent promptly, leading to work being forgotten
• Pricing errors on invoices (undercharging due to mistakes)

Revenue leakage is particularly common in professional services and trades businesses, where the boundary between billable and non-billable work is not always clear.

4. Overhead Creep

Overhead creep occurs when overhead costs grow faster than revenue. This is a gradual process — each individual cost increase seems small, but the cumulative effect over several years can be significant.

Common causes include:

• Staff headcount growing ahead of revenue
• Premises costs increasing without a corresponding increase in revenue
• Software and subscription costs accumulating without review
• Vehicle fleet growing beyond what utilisation justifies
• Management layers being added without a clear productivity benefit

Overhead creep is insidious because it happens slowly. A business that was lean and profitable five years ago may have accumulated $100,000 or more in additional overhead without any single decision that felt significant at the time.

5. Customer Mix Deterioration

Not all customers are equally profitable. Some customers pay promptly, require little management, and generate repeat work at good margins. Others negotiate hard, pay slowly, require significant hand-holding, and generate disproportionate complaints and rework.

If your customer mix shifts over time toward less profitable customers — perhaps because you have been competing on price, or because your most profitable customers have been neglected — your overall margin will decline even if nothing else changes.

Customer mix deterioration is one of the hardest forms of margin leakage to identify because it does not show up clearly in aggregate financial data. It requires analysis at the customer level.

How to Identify Margin Leakage in Your Business

Compare your target margin to your actual margin. What gross margin were you expecting to achieve, based on your pricing? What did you actually achieve? The gap is your starting point.

Analyse margins by job type, product line, or customer. Aggregate margins hide the variation. When you break down margins by category, the sources of leakage become visible.

Track actual costs against estimates. For every job or project, compare what you estimated to what it actually cost. Consistent overruns in specific categories point to specific problems.

Review your invoicing process. Are all variations and additional work being captured and invoiced? Is there a systematic process for ensuring nothing is missed?

Audit your overhead. When did you last review every overhead cost line? What has grown faster than revenue over the past three years?

Analyse your customer profitability. Which customers are genuinely profitable when you account for the time and resources they consume? Which are not?

Fixing Margin Leakage

The fix depends on the source:

Pricing gaps: Update your pricing methodology to reflect actual costs. Implement a process for capturing and charging variations. Review prices regularly against cost increases.

Direct cost overruns: Implement job costing to make overruns visible. Identify the specific causes — labour efficiency, material waste, subcontractor management — and address them directly.

Revenue leakage: Tighten your invoicing process. Make it clear what is billable and what is not. Implement a review step before invoices are sent to catch errors and omissions.

Overhead creep: Conduct a structured overhead review. Identify costs that have grown without a corresponding increase in revenue or value. Renegotiate, reduce, or eliminate.

Customer mix deterioration: Identify your most and least profitable customers. Invest in retaining the most profitable. Consider whether the least profitable are worth keeping at current pricing.

Margin Leakage and Business Value

A business with well-managed margins — where leakage has been identified and addressed — is significantly more valuable than one where margins are thin and the causes are unclear.

Buyers and their advisors will identify margin leakage during due diligence. If you find it first and fix it, you control the narrative and capture the value. If they find it first, they will discount the price accordingly.

A Business Profitability Review is designed to identify margin leakage systematically — across pricing, direct costs, overhead, and customer mix — and provide a clear picture of where the opportunities are and what they are worth.

For a related read, see our article on whether you know your margins. If you are ready to act on what you find, our profit improvement service is the next step.

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Ridgeline Advisory is a Christchurch-based business advisory firm helping NZ business owners improve profit, reduce costs and plan succession and exit.

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