Profit and Loss Statement (P&L)

A profit and loss statement (P&L) is a financial report showing how much revenue a business generated over a set period and how much it cost to generate it. The difference between the two reveals the net profit - or net loss. It sits alongside the balance sheet and the cash flow statement as one of the three core financial statements. Every UK limited company must include a P&L in the annual accounts filed with Companies House.

What a Profit and Loss Statement Contains

The P&L is organized as a top-down calculation. Revenue appears at the top - often called the top line - and costs are deducted in stages until net profit appears at the bottom. The main line items are:

• Revenue (turnover): Total income from sales before any deductions. VAT-registered businesses report this figure exclusive of VAT.
• Cost of goods sold (COGS): The direct cost of producing or purchasing what you sell, including materials, bought-in goods, and direct labor.
• Gross profit: Revenue minus COGS. This is what remains after covering direct production costs.
• Operating expenses: Ongoing costs of running the business that are not tied directly to production - rent, salaries, utilities, marketing, and insurance.
• Net profit (or net loss): What remains after all costs, including operating expenses, interest, and tax, are subtracted from revenue.

The practical distinction between COGS and operating expenses is that COGS moves up and down with sales volume, while operating expenses are largely fixed.

How to Read Your P&L: The Margin Calculations That Matter

The absolute figures in a P&L become most useful when expressed as percentages and compared over time. Two margin ratios do most of the work:

Gross profit margin** = (Gross profit / Revenue) x 100. This shows how efficiently the business covers direct production costs. A declining gross margin usually points to rising material prices, pricing pressure, or a shift toward lower-margin work.

Net profit margin** = (Net profit / Revenue) x 100. This is the bottom-line measure: how much of every pound of revenue the business actually keeps. Benchmarks vary by sector, so the most useful comparison is against your own P&L from the equivalent period in the prior year.

A P&L produced under the accrual method - the standard for most UK businesses - records sales when work is completed, not when payment arrives. According to Xero Small Business Insights, UK small businesses waited an average of 29 days to be paid in the first quarter of 2026, with invoices paid an average of 8.2 days late. A business can show a healthy net profit on its P&L and still face a cash shortfall if customers are slow to pay. This is why reviewing the P&L alongside the cash flow forecast gives you the clearest picture of business health.

Zigaflow integrates with Xero, QuickBooks, and FreeAgent, so every invoice raised flows into your accounting software automatically. That keeps your P&L current without manual data entry, and the margin picture you are looking at reflects the work you are actually running.