Quick answer
Improve gross profit margin by raising what each sale earns or lowering what each sale costs to deliver. The main levers are pricing, product and customer mix, supplier costs, waste and rework, direct labour efficiency and discount discipline. Measure margin by product line and customer, not just overall, because the business average usually hides a few lines that quietly lose money.
Key points
- Gross margin % = (sales − direct costs) ÷ sales.
- Measure it by product, service and customer — averages hide the losers.
- Mix matters as much as price: selling more of your best-margin work lifts the whole business.
- Small percentage gains compound into large profit gains.
Gross margin is the engine room of a business. It’s what’s left from each sale to pay rent, wages, loan repayments and eventually you. When it slips by a few points, the business can work just as hard and end up with far less — and because it happens slowly, most owners don’t notice until the bank balance does.
What is gross profit margin, exactly?
Gross margin % = (sales − direct costs) ÷ sales × 100
Direct costs are the ones that come with each sale: stock, materials, direct labour, subcontractors, freight, merchant fees on that sale. Overheads — rent, admin staff, insurance — sit below gross profit.
One trap: margin isn’t markup. Add 50% to a $100 cost and you sell for $150, but your margin is $50 ÷ $150, about 33%. Businesses that price by markup while thinking in margin under-price systematically.
Gross margin also drives how comfortably a business can carry growth. Every hire, lease and piece of equipment has to be paid for out of gross profit, so a business running on thin margins has less room for mistakes — and less capacity to repay funding — than one with a few extra points.
Why measure margin by product and customer?
Because the average lies. A business with a 38% overall margin might have one service line at 55%, two at 40% and one at 12%. The 12% line might be the one the owner enjoys most, or the one a loyal customer always orders.
| Illustrative line | Sales | Direct costs | Gross margin |
|---|---|---|---|
| Maintenance contracts | $240,000 | $108,000 | 55% |
| Standard installs | $380,000 | $228,000 | 40% |
| Custom projects | $210,000 | $130,000 | 38% |
| Rush and after-hours jobs | $110,000 | $97,000 | 12% |
| Total | $940,000 | $563,000 | about 40% |
Illustrative figures. In this example, rush jobs are priced as if they were standard work, while carrying overtime, express freight and disruption. Re-pricing them — or declining some — would lift the whole business.
What are the nine levers?
Price levers
- Raise prices on under-priced lines first. See raising your prices.
- Charge for extras — rush fees, after-hours rates, variations, delivery.
- Tighten discounting. Every discount is margin given away; our piece on the true cost of discounts shows how much.
Mix levers
- Sell more of your best-margin work. Promote it, train staff to recommend it, bundle it.
- Review low-margin customers. Some are worth keeping for volume; others need new pricing.
Cost levers
- Renegotiate with suppliers. Consolidate orders, ask for volume pricing, compare quotes annually.
- Cut waste and rework. Spoiled stock, returns, redo jobs and wasted materials all hit gross margin.
- Improve direct labour efficiency. Better scheduling, fewer wasted trips, templates and checklists.
- Buy smarter. Bulk buying can lower unit cost — if the stock sells reliably and you can fund it without straining cash flow.
Lever nine sometimes needs capital up front. If a supplier deal would lift your margin but you can’t fund the order, see whether you could qualify for funding — no credit check to find out.
How much difference do a few points make?
More than you’d think. In the illustrative business above, lifting margin from 40% to 43% on the same $940,000 of sales adds about $28,000 of gross profit a year — without winning a single extra customer. With fixed costs unchanged, nearly all of that reaches net profit.
How do you keep margin from slipping again?
- Track it monthly by line, not just annually for the whole business.
- Update prices when costs change, not a year later.
- Quote from current costs — an old price list is a common leak (see quoting a job).
- Review your biggest customers every year for profitability, not just revenue.
Our feature on the numbers every owner should know puts gross margin alongside the handful of other figures worth watching.
Where does margin leak without anyone noticing?
Some of the biggest margin losses never show up as a single line in the accounts:
- Unbilled time and materials. Extra trips, small add-ons and “while I’m here” jobs that never make it onto the invoice.
- Old price lists. Quotes and online prices that haven’t caught up with supplier increases.
- Freight and merchant fees absorbed rather than passed on or built into prices.
- Stock shrinkage — damage, theft, expired products and miscounts.
- Rework and warranty calls that eat labour without any revenue.
- Special deals that became permanent for long-standing customers.
A quarterly margin audit — pick ten recent jobs or sales and trace every cost against the price charged — usually finds at least one of these. Fixing it is often faster and less confronting than a general price rise. Our guide to quoting a job covers how to stop leaks at the quoting stage.
Healthy margins make growth fundable
Growth consumes cash: stock, staff, equipment and space all come before the revenue they produce. A business with strong margins can carry that growth — and repay any funding behind it — far more comfortably than one running on thin ones.
When you’re ready to take the next step, we’re here. We consider trading businesses for unsecured facilities typically from $5,000 to $500,000 and property-secured loans from $20,000 to $5,000,000. Enquiring is free of credit checks, your details stay with our team rather than being shopped around, and a real person calls to talk it through. Accurate answers on the form help us suggest the right option straight away.
Frequently asked questions
What is a good gross profit margin?
It varies enormously by industry — a retailer, a builder and a consultant will all have very different margins. Compare against your own history and industry benchmarks such as the ATO's small business benchmarks rather than a single universal figure.
What's the difference between gross margin and net margin?
Gross margin only deducts the direct costs of making the sale — materials, stock, direct labour. Net margin also deducts overheads such as rent, admin wages and insurance. You need a healthy gross margin to have any chance of a healthy net margin.
Is margin the same as markup?
No. Markup is profit as a percentage of cost; margin is profit as a percentage of the sale price. A 50% markup on cost gives a margin of about 33%. Mixing them up is a common way to under-price.
How quickly can I improve my margin?
Price changes and supplier renegotiations can work within weeks. Changing product mix, cutting waste and improving labour efficiency usually take a few months but last longer.