Why Profit Margins Matter More Than Turnover
A full order book and high sales figures can feel reassuring, but they do not automatically mean the business is healthy. What really decides whether you can grow with confidence is the money left after costs. Profit margin tells you that story far more clearly than turnover ever will.
Two businesses can both bill the same amount, yet one will have cash in the bank, options for growth and calm owners, while the other struggles to pay suppliers and wages. Often, the difference is just a few percentage points of margin. Small shifts in pricing, discounting or costs can turn a tight business into a strong one, or the other way round.
Common traps we see are:
- Chasing any sale, even if the margin is thin
- Dropping prices too quickly to win work
- Undercharging for time, expertise or risk
Experienced owners and finance directors know this, which is why they track margin before anything else. As accountants for entrepreneurs, we focus on margins because they show whether the business model is working, not just whether it looks busy on paper.
Breaking Down Profit Margins in Plain English
Let us strip this back to three simple building blocks.
- Sales: what your customers pay you
- Direct costs: what it directly costs you to deliver that work or product
- Overheads: everything else you need to run the business
From these, we get two key profits.
Gross profit is sales minus direct costs. Gross margin is that profit as a percentage of sales. It answers the question, "Is each sale worth doing?"
Net profit is what is left after all costs, including overheads. Net margin is that profit as a percentage of sales. It answers, "Is the whole business model working?"
Here is a simple example.
- Sales in a month: £20,000
- Direct costs: £8,000
- Overheads: £6,000
Gross profit = £20,000 minus £8,000 = £12,000
Gross margin = £12,000 divided by £20,000 = 60%
Net profit = £12,000 minus £6,000 = £6,000
Net margin = £6,000 divided by £20,000 = 30%
If sales went up to £25,000 but direct costs and overheads rose so much that net profit stayed at £6,000, your net margin would fall. On the surface, you are selling more, but each pound of sales is now working harder for less reward.
How to Calculate Your Profit Margins Step by Step
You do not need to be a finance director to track margins. A simple monthly or quarterly routine is enough.
Gather accurate figures
Use your bookkeeping or accounting software to pull:
- Total sales for the period
- Total direct costs
- Total overheads
If your records are behind or mixed up, margins will be misleading, so this step really matters.
Separate direct costs from overheads
Think of direct costs as those that would largely disappear if you stopped selling for a while. For example:
- Materials and components
- Subcontractor or freelance costs tied to projects
- Delivery costs linked to specific orders
Overheads are the costs of keeping the doors open:
- Rent and utilities
- Salaries for admin and management
- Insurance, software, marketing
Work out gross profit and margin
Gross profit = sales minus direct costs.
Gross margin = gross profit divided by sales, then multiplied by 100 to get a percentage.
Work out net profit and margin
Net profit = gross profit minus overheads.
Net margin = net profit divided by sales, again multiplied by 100.
Go deeper by line, client or project
High-level margins are helpful, but the real insight often comes from breaking things down. When reports are set up correctly, you can check margin by:
- Product or service line
- Type of project
- Individual clients or contracts
Accountants for entrepreneurs can help design these reports so they update automatically each month and are easy to read.
Reading Your Margins and What They Are Telling You
Once you have the numbers, the next step is interpreting them.
Warning signs to watch for include:
- Gross margin shrinking over several periods
- Sales growing but profits barely moving
- Busy teams but low net profit at year-end
Shrinking gross margin might mean:
- Supplier prices have risen and you have not adjusted yours
- Staff are spending longer on each job than planned
- Discounting has become the norm rather than the exception
Low or falling net margin might point to:
- Overheads creeping up without review
- Too many low-margin clients compared with high-value ones
- Extra staff or subscriptions that sales do not yet support
Useful questions to discuss with an adviser include:
- Are our margins enough to fund growth, tax and drawings?
- Are we taking on too much low-margin work for the risk and stress involved?
- Do our better clients and projects share any patterns we can build on?
The goal is not perfection, but clarity. Once you understand what your margins are saying, better decisions follow naturally.
Practical Ways to Improve Your Profit Margins
There are three main levers you can pull: prices, costs and business mix.
Pricing and value
- Review prices regularly, do not leave them unchanged for years
- Sell the value and outcomes, not just hours or units
- Set clear rules on discounts and link them to real savings in effort or cost
Cost control without cutting quality
- Look for waste, repeat work and avoidable errors in your processes
- Review key suppliers, contracts and payment terms
- Use simple technology to remove manual data entry and speed up routine tasks
Business mix and strategy
- Identify your highest-margin clients, services or products
- Reduce or reshape work that consistently delivers weak margins
- Plan growth around the profitable core of the business, not just what is easiest to sell
Often, improving margin is about many small changes rather than one dramatic move. A few percentage points gained in several areas can transform results.
Using Margins to Improve Cash Flow and Tax Planning
Stronger, more stable profit margins usually bring better cash flow. When each sale generates a healthy profit, you have more room to:
- Fund new hires and training
- Invest in better systems and equipment
- Build a buffer for quieter periods
Healthy margins also make tax planning simpler. You can:
- Set aside money for tax throughout the year without panic
- Decide on drawings, dividends and salaries with more confidence
- Explore legal ways to reduce tax through timing and structure, rather than last-minute reactions
This is where a trusted financial partner adds real value. We can model:
- What if you raised prices by a small amount?
- What if you added a new service or stopped a draining one?
- What if you hired earlier to support growth or delayed to protect cash?
Linking margin, cash flow and tax in one clear plan helps you grow on purpose, not by accident.
Turning Margin Insights Into Confident Decisions
A good next step is to review your margins over the last year or two. Look at the trend, not just a single month. Are margins improving, holding steady or sliding?
You might then:
- Pull a basic margin report from your accounting software
- Flag one high-margin and one low-margin area to explore
- Note three questions you would ask an adviser about pricing, costs or business mix
You do not need to become an accountant to use margins well. You just need clear information, regular reviews and someone who can translate the numbers into day-to-day decisions.
As accountants for entrepreneurs, we see our role as a relationship-based one. We help turn raw figures into practical actions, support long-term decisions and shape financial plans that fit each owner's goals and appetite for risk. When profit margins are understood and managed, growth feels far more controlled, and business owners can focus on building something that lasts.
Take The Next Step Towards Confident Business Growth
If you are ready to turn your ideas into a stronger, more resilient business, our specialist accountants for entrepreneurs are here to help you plan the numbers with clarity. At Keirstone, we work closely with founders to simplify complex decisions and put practical strategies in place from day one. Start a conversation with our team today through our contact page and move forward with a clear financial roadmap.
