Gross margin, also known as gross profit margin, is a financial profitability ratio that measures the percentage of turnover a business retains after paying the direct costs of creating its goods or delivering its services. In the UK, it shows how efficiently your business turns top-line sales into gross profit before accounting for administrative overheads, financing costs, and corporation tax. Tracking this metric helps finance leaders and commercial managers evaluate pricing models, assess unit economics, and protect profitability.
What is gross margin?
Gross margin reflects the direct trading profitability of a company before taking account of indirect business expenses.
Turnover represents the total revenue derived from your ordinary business activities, calculated after deducting trade discounts, value added tax (VAT), and other sales-related taxes. Cost of sales, often referenced alongside cost of goods sold (COGS), covers the direct expenses associated with producing or acquiring items for sale.
Under UK GAAP (FRS 102 Section 13), cost of sales includes direct materials, direct production labour, direct subcontractor costs, and an allocated share of fixed and variable production overheads incurred to bring inventory to its present location and condition.
How to calculate gross margin
Finance teams assess gross margin by examining the relationship between turnover and direct delivery costs.
Gross margin formula
The gross profit margin ratio expresses gross profit as a percentage of total turnover or revenue. Rather than looking solely at cash figures, this margin formula assesses how much surplus each pound of revenue generates after accounting for direct delivery costs. Finance teams seeking formal statutory calculation frameworks should consult official guidance published by professional accounting bodies like the ICAEW.
Gross margin calculation example
To see how a gross profit margin calculation functions in practice, consider a UK retail business that purchases homeware units for £60 each and retails them for £100 (excluding VAT):
- Gross profit: £100 - £60 = £40
- Margin percentage: £40 out of £100 represents 40%
In this scenario, the company retains 40% of its turnover to fund administrative overheads and generate net earnings.
For a service business, direct expenses focus on direct delivery rather than physical stock. If a SaaS provider generates £500,000 in quarterly turnover alongside £100,000 in direct cloud hosting and onboarding support, the gross profit is £400,000, representing an 80% margin. Corporate office rent, executive pay, and general sales software remain excluded from cost of sales.
Gross margin vs. gross profit: what is the difference?
While the terms are often used interchangeably in casual conversation, gross margin and gross profit measure different dimensions of commercial performance:
- Gross profit: Represents an absolute monetary amount expressed in pounds sterling (£), revealing the trading surplus remaining after direct delivery costs.
- Gross margin: Represents a relative ratio expressed as a percentage (%), demonstrating the efficiency of that surplus relative to revenue scale.
For example, a company generating £100,000 in gross profit on £200,000 of turnover has a 50% gross margin. Another firm generating £100,000 in gross profit on £1,000,000 of turnover has a 10% gross margin. Both produce the identical absolute gross profit, but the first business extracts five times more margin per pound of revenue, providing a much thicker cushion against operational overheads.
Gross margin vs. net margin
Understanding gross margin vs net margin is essential for diagnosing where a business creates or loses cash.
Gross margin assesses direct production and fulfilment efficiency. Net profit margin measures total bottom-line profitability after deducting all allowable business expenses, including distribution costs, administrative salaries, property rent, marketing, depreciation, amortisation, financing interest, and corporation tax.
A company can deliver an 80% gross margin and still trade at an unsustainable net loss if its marketing spend, executive salaries, or debt interest outstrip its gross profit. Conversely, high-volume operations like grocery supermarkets often operate successfully on slim gross margins because their operating overheads are tightly controlled and stock turnover is rapid.
Why is gross margin important?
Tracking gross margin delivers several strategic and regulatory benefits:
- Early warning indicator: A dropping gross profit margin is often the earliest signal of rising supplier prices, production inefficiencies, or unplanned discounting. If raw material prices increase while selling prices remain static, gross margin compresses immediately.
- Pricing discipline: Tracking margins by product category or service line reveals which offerings cover business overheads, preventing teams from chasing unprofitable revenue.
- Commercial agreements and transactions: Dealmakers and corporate finance advisers often evaluate gross margin stability when assessing commercial health or structuring transaction earn-outs after an ownership change.
- Statutory and tax compliance: Qualifying small UK entities filing abridged accounts under FRS 102 Section 1A can, with unanimous shareholder consent, choose to start their statutory profit and loss account directly at gross profit. Meanwhile, HMRC scrutinises direct trading deductions reported on tax returns, comparing margin trends across trading periods to detect anomalies.
What is a good gross margin?
There is no single universal benchmark for a good gross margin. Healthy margins vary considerably depending on industry structure, capital intensity, inventory velocity, and business model.
Sector benchmarks illustrate these variations:
- Software and SaaS: Software businesses benchmark gross margins against specific cohorts. According to the 2026 Jurassic B2B SaaS Benchmarks Report, the median gross margin held firm in FY 2025 at 77% for B2B SaaS companies generating $5M to $20M ARR, and was roughly 80%-81% for SaaS companies with $20M-$100M ARR. Pure SaaS reference models commonly target 70% to 85%.
- Hospitality: UK hospitality benchmarks typically target food gross profit margins of 65% to 72% for casual dining and pubs (65% to 70% for fine dining), while the UKHospitality and Christie & Co benchmarking survey found food-sales gross margins averaging around 67%.
Rather than pursuing generic cross-industry targets, finance teams should evaluate their gross margin against direct peers and ensure it comfortably covers operating overheads.
How to increase gross margin
Businesses can improve gross margins by addressing either top-line pricing or direct fulfilment costs:
- Renegotiate procurement terms: Consolidate supplier volumes, explore alternative component sourcing, or take advantage of prompt payment discounts to reduce direct material costs.
- Tighten pricing controls: Set formal approval workflows for commercial discounts, implement periodic price indexation linked to inflation, and eliminate loss-making product bundles.
- Target scrap and shrinkage: Improve warehouse inventory management, reduce manufacturing defects, and streamline stock handling to cut inventory write-offs before sale.
- Shift the sales mix: Use margin analysis to identify high-margin services or products and incentivise commercial teams to prioritise those lines over lower-margin alternatives.