Net margin

Definition

Net margin is net profit expressed as a percentage of revenue — the proportion of every pound of sales that survives once all costs are taken out: cost of sales, overheads, salaries, interest on borrowing and tax. A net margin of 8% means that for every £100 of revenue, £8 is genuine bottom-line profit. Where gross margin measures the profitability of your core trade, net margin measures the profitability of the whole business once everything is paid.

In plain terms

If gross margin is what is left after paying for the ingredients, net margin is what is left after paying for the ingredients and the rent, the staff, the accountant, the loan interest and the taxman. It is the truest single measure of whether the business actually makes money. A company can boast a fat gross margin yet a wafer-thin net margin if its overheads are bloated — the gap between the two tells you how much the cost of simply running the business is eating into trading profit.

Why it matters to your business

Net margin is the figure that decides whether the whole enterprise is worth running. It captures efficiency across every layer — production, overheads, financing and tax — so a healthy net margin signals a business that is well controlled from top to bottom. A thin one warns that costs somewhere in the chain are swallowing the profit, even if sales and gross margin look fine. Because net margin already includes interest on existing debt, it is also where the cost of borrowing shows up in full: well-priced finance that funds profitable growth should, over time, lift net margin rather than drag on it.

• The single clearest read on real profitability
• A wide gross-to-net gap points to heavy overheads
• Already reflects the cost of existing borrowing

Its place in affordability

When you assess whether a business can afford to borrow, net margin is the reality check. It shows the genuine profit cushion out of which repayments must ultimately come, after the business has met all its other obligations. A comfortable net margin means there is slack to service a new facility even if trading dips; a razor-thin one means any setback could leave nothing to cover the instalments. Run the numbers honestly: model the repayments with the repayment calculator, check they sit inside your net margin with room to spare, and remember that borrowing to fund profitable growth is sound, while borrowing to plug a structural loss rarely is.