Hi

Most owners look at sales first.

A few pay attention to net profit.

Almost none look at gross margin broken down by product, service line, customer or distribution channel.

And that’s usually why they work hard, stay busy, and still feel their business isn’t delivering the return it should.

Your overall gross margin tells you whether your business model is working effectively

If you've been reading my emails for any length of time you'll know that I am a firm believer that measuring your gross margins by segment - particularly by customer and by product - are the most important metrics you need to improve the profitability of your business.

It's the metric I recommend to all my clients when we first start working together

The moment you start to break down your gross margin by segment, you see the truth: some parts of the business carry you, some hold you back, and some quietly destroy value without anyone noticing.

Once you see this properly, you start making different decisions. Better ones.

The problem with an “average” gross margin

An average margin is tidy but meaningless. It blends everything together and hides the differences that matter.

You can be selling profitable and unprofitable products at the same time.

You can be serving customers who appreciate your value and others who drain your team.

You can run services that produce excellent margins alongside others that have never been priced properly.

You can be selling through channels that feed your business and others that produce impressive revenue but deteriorating margin.

The average masks all of this. It lulls you into thinking things are fine because, on the surface, they look fine.

Only when you break your gross margin down do you understand what’s really happening.

What you learn when you look properly

The first thing you notice is how uneven your business really is. You see where your pricing holds up and where you’ve been too cautious. You see which customers and service lines genuinely create value and which ones are busywork dressed up as revenue.

You also see the cost of serving different kinds of work. Some customers are straightforward and predictable. Others need hand-holding, change direction frequently, stretch scope, delay decisions, and eat margin for sport. On a P&L they can look identical. In a gross margin analysis they are worlds apart.

Channels tell their own story. Selling from your own website, a physical location, Amazon, wholesale or a platform each creates a different margin profile once you factor in fees, returns, shipping, fulfilment and discounts.

Two channels may generate the same sales but completely different profit.

You also get a clearer picture of your service mix. Most small businesses offer more than they need to. They carry legacy products that no longer make sense, low-margin services introduced years ago, and activities that absorb far more time and energy than they return. Once you look at margin by service line, these become obvious.

Segment-level margins reveals where the business gets its return and where it gives it away.

Why this matters so much more than revenue or net profit

Revenue can be very misleading. Overheads blur the picture. Net profit only tells you what happened long after the decisions have been made.

Gross margin, analysed properly, is the early-warning system. It tells you what’s working, what’s slipping and what needs attention now.

When owners finally see this, three things tend to happen:

• They realise their incentives have been pointing in the wrong direction.
• Teams often prioritise the easiest work, not the most profitable work.
• They see that some customers are being subsidised. These are often the loudest, most demanding ones — the sort of customers you instinctively protect because they spend a lot, even though the numbers show they take more than they contribute.

And they stop trying to grow every part of the business. They double down on the parts that pull their weight and quietly exit the rest.

This shift, on its own, can transform a business.

The UK-specific margin leaks owners often miss

Margins move for reasons that aren’t obvious unless you look closely. Courier costs rise. Supplier prices creep. Subcontractor rates shift. Platform fees increase. Payment processors take bigger slices. Post-Brexit friction adds delay, cost and unpredictability. Returns change the economics of entire product categories.

All of this affects different segments differently. Your website channel might hold up well. Your Amazon channel might fall apart. Your older service lines might tolerate price rises. Your newer ones might need a complete rethink.

Without segment-level visibility you don’t see any of this until cashflow feels tight and you can’t understand why.

Why this analysis matters right now

Most small businesses are operating in an environment where wages, borrowing costs and supplier prices are rising faster than customers’ willingness to pay. That pressure doesn’t hit everything evenly. Some parts of your business will remain strong. Others will become unviable unless you change how you sell, price or deliver.

If you only look at headline numbers, you miss the variation.

If you look at margin by segment, you spot the patterns early.

Owners who do this make quicker adjustments. They are more confident with price rises. They understand which parts of their business are robust and which aren’t. They stop trying to be everything to everyone. They simplify, focus and stabilise their business.

And they make better decisions because they’re working with the truth, not with assumptions.

The behavioural shift this creates

What I see again and again is that once a business owner understands their gross margin by segment, their whole mindset changes.

They stop chasing revenue for the sake of it. They become far more selective about the work they take on. They lean into the parts of the business that produce a strong return and stop apologising for letting go of the parts that don’t. They protect their team’s time. They regain control of their pricing. They refine their ideal customer profile. They stop running themselves ragged for the wrong people.

Most importantly, they start asking a far better question every week:

Where are we actually making money — and where are we losing it?

Ask that consistently and the business becomes calmer, clearer and more profitable.

Noel Guilford

PS At Guilford Accounting we use the tracking function in Xero to capture the data you need to monitor your gross margins by segment; if you'd lke a complimentary demonstration how to set it up for your business book a no-obligation call with me.