Gross margin and net margin are two of the most important numbers in any business. They are also two of the most commonly confused — or ignored entirely.

Many NZ business owners track revenue closely and check their bank balance regularly, but have only a vague sense of their margins. This is a significant blind spot. Margins tell you things that revenue and cash balance cannot: whether your pricing is right, whether your costs are under control, and whether the business is genuinely profitable or just busy.

What Is Gross Margin?

Gross margin measures the profitability of your core activity — producing your product or delivering your service — before overhead costs are considered.

Gross Margin (%) = (Revenue − Cost of Goods Sold) ÷ Revenue × 100

Cost of Goods Sold (COGS) includes only the direct costs of production or delivery: raw materials, direct labour (the people doing the work, not management), subcontractors, and any other costs that vary directly with the work done.

If your business generates $800,000 in revenue and your COGS is $480,000, your gross margin is:

($800,000 − $480,000) ÷ $800,000 × 100 = 40%

Gross margin tells you: for every dollar of revenue, how much is left after paying for the direct cost of the work? A 40% gross margin means 40 cents of every revenue dollar is available to cover overhead and generate profit.

What Is Net Margin?

Net margin measures the overall profitability of the business after all costs — including overhead, owner salary at a market rate, interest, and tax.

Net Margin (%) = Net Profit ÷ Revenue × 100

Net profit is what remains after everything has been paid. For owner-operated NZ businesses, this calculation requires an important adjustment: the owner's drawings or salary must be normalised to a market rate. If you are paying yourself $60,000 when a market-rate replacement would cost $120,000, your reported profit is $60,000 higher than it should be for comparison purposes.

Using the same example: if net profit (after a market-rate owner salary) is $80,000 on $800,000 revenue, net margin is 10%.

What Each Margin Tells You

Gross margin and net margin diagnose different problems. Understanding which is out of line tells you where to look.

Thin gross margin points to problems with pricing, direct costs, or both. Your revenue is not covering the cost of doing the work efficiently. Possible causes: underpricing, high material costs, inefficient labour, subcontractor rates that are too high, or poor job costing that allows cost overruns to go unnoticed.

Healthy gross margin but thin net margin points to an overhead problem. You are delivering the work efficiently, but the cost of running the business is consuming the profit. Possible causes: premises costs, management headcount, vehicle fleet, software subscriptions, or finance costs that are too high relative to revenue.

Both margins thin indicates a more fundamental problem — the business model itself may not be viable at current scale, or there are structural issues with both pricing and overhead that need to be addressed together.

Industry Benchmarks for NZ Businesses

Margins vary significantly by industry. Comparing your margins to your own history is useful; comparing them to industry benchmarks is essential.

Approximate gross margin ranges for common NZ business types:

• Trades businesses (construction, electrical, plumbing): 30–45%
• Professional services (accounting, legal, consulting): 55–75%
• Medical and allied health practices: 45–65%
• Retail: 25–40%
• Manufacturing: 25–45%
• Hospitality: 60–70% (gross margin on food and beverage, before labour and overhead)

Net margin benchmarks are harder to generalise because they depend heavily on the owner's salary structure and the business's debt position. A net margin of 8–15% is a reasonable target for most NZ SMEs. Below 5% is a warning sign. Above 20% is exceptional and worth understanding — it may reflect genuine competitive advantage, or it may reflect an owner who is underpaying themselves.

Why the Owner Salary Adjustment Matters

This point deserves emphasis because it is so commonly misunderstood.

In many NZ owner-operated businesses, the owner takes drawings rather than a formal salary, or pays themselves a salary well below market rate. This makes the reported profit look better than it really is.

When you are assessing your own business — or when a buyer is assessing it — the owner's compensation needs to be normalised to what it would cost to replace the owner with a market-rate employee. This is called an "add-back" or "normalisation adjustment."

If you are running a $2 million revenue business and paying yourself $80,000 when a market-rate general manager would cost $150,000, your normalised profit is $70,000 lower than your reported profit. This matters enormously for valuation.

Tracking Margins Over Time

A single margin calculation is a snapshot. Tracking margins over time — monthly or quarterly — reveals trends that are invisible in annual accounts.

Are your margins improving or declining? Is the decline seasonal or structural? Are margins consistent across different types of work, or does one product line or service type consistently underperform?

Monthly margin tracking does not require sophisticated software. A simple spreadsheet with revenue, COGS, gross profit, overhead, and net profit — updated monthly — gives you the trend data you need to manage the business actively rather than reactively.

Margins and Business Value

When a buyer values your business, they are essentially buying a stream of future profits. The higher and more consistent your margins, the more valuable that stream is.

A business with a 15% net margin is worth significantly more than one with a 5% net margin at the same revenue level — not just because the absolute profit is higher, but because higher margins signal pricing power, cost discipline, and a business that is not dependent on volume to survive.

Improving your margins before a sale is one of the most direct ways to increase your sale price. A 3-percentage-point improvement in net margin on a $1.5 million revenue business adds $45,000 to annual profit — and at a 3× EBITDA multiple, that is $135,000 more on your sale price.

Getting Started

If you do not currently track gross and net margin separately, start now. Pull your last 12 months of accounts, separate direct costs from overhead, and calculate both margins. Compare them to industry benchmarks. Identify which is out of line and why.

If the picture is more complex than a spreadsheet can handle — or if you want an independent view of where your margins stand and what can be done to improve them — a Business Profitability Review provides a structured analysis across all the key dimensions.

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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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