Contribution margin

Definition

Contribution margin is sales revenue minus variable costs. It shows how much of each sale is available to cover fixed costs and, once those are met, to generate profit. It underpins break-even analysis.

In plain terms

It's the money a sale throws off after its own direct costs, before your fixed overheads. Add enough contributions together and you cover the fixed costs, then start profiting.

Why it matters for your company

Understanding contribution helps you price, prioritise products and judge growth decisions. See gross margin.

In practice

Picture a UK limited company that sells a mix of products or services. Each time it makes a sale, the direct, variable costs of that sale (materials, packaging, a delivery charge, a piece-rate wage) come off the top first. What remains is the contribution — money the company can put toward rent, salaried staff, insurance and other costs that don't move with each sale. Only once enough contribution has accumulated across a period does the business clear its fixed costs and start generating profit.

The practical use is comparative. A director weighing up two product lines, two contracts, or whether to accept a one-off order at a lower price can look at contribution per unit rather than headline revenue. A lower-priced line can still be worth taking on if its contribution is healthy and there's spare capacity, whereas a high-revenue line with thin contribution may be doing less for the business than it appears to.

How lenders read it

When a lender looks at a company's numbers, contribution margin is one of the signals used to judge how resilient the business model is to a change in trading conditions. A company where most costs are variable can flex its cost base down quickly if sales soften, which tends to reduce risk. A company with a large fixed-cost base relative to its contribution has less room to manoeuvre, so revenue needs to hold up more consistently to keep covering those costs.

This sits alongside — not instead of — the other things a lender considers, such as trading history, cash flow and how the company has managed its obligations. Contribution margin on its own doesn't tell a lender everything, but it helps explain why two companies with similar turnover can carry very different levels of underlying risk. Creditcorp lends to UK limited companies and LLPs, and reads figures like this in the context of the company's own accounts and trading pattern, not against a generic benchmark.