A profit and loss statement — usually called a P&L, or an income statement — answers one blunt question: did the business make money over this period, and where did it come from? It is not a picture of your bank balance. It is the trading story: what you sold, what it cost to sell, what it cost to keep the lights on, and what was left. Learn to read those lines and your accounts stop being an annual obligation and become something you actually use.
What the P&L shows, and what it leaves out
A P&L covers a period of time — a month, a quarter, a financial year. The balance sheet is a snapshot of a single date. Confusing the two is one of the most common reasons people misread their own numbers.
Inside the P&L you will find sales, the direct costs of those sales, running costs, and one or more profit figures. What you will not find: VAT you have collected (it belongs to HMRC), loan repayments (only the interest element), equipment purchases (only the depreciation), or drawings taken by a sole trader (not an expense).
So a profitable business can still run short of cash, and a business with money in the bank can still be loss-making. Keep the P&L and your cash flow forecast side by side and you will spot trouble earlier.
Revenue: the top line
Revenue — turnover, in UK filing language — is the value of what you sold in the period, excluding VAT, refunds and any sales you have had to credit. Timing matters. If you invoice in March for work delivered in March, it belongs in March even if the client pays in May.
Two questions are worth asking every time. Is growth coming from more customers, or from higher prices? And how much of the total comes from one or two clients? A turnover figure that looks impressive but rests on a single customer is fragile.
Cost of sales and gross profit
Cost of sales is what you spent directly to deliver what you sold. For a product business that means stock, packaging, inbound freight and often card processing fees. For a service business it might be subcontractors, materials, or the direct labour of the people doing the work.
Subtract it from revenue and you get gross profit. Express that as a percentage of revenue and you have your gross margin.
£200,000 revenue less £120,000 cost of sales gives £80,000 gross profit — a 40% gross margin.
Gross margin is one of the most revealing numbers in the statement. If revenue rose 15% but margin slipped from 40% to 34%, something is wrong: discounting, rising supplier costs, or a mispriced job. Watch it monthly. Small drifts are easy to miss and hard to reverse.
Two things trip people up here. Stock: if you have bought stock but not sold it, it should not sit in cost of sales. And personal spending: a supermarket shop run through the business account distorts your margin and causes problems at year end.
Operating expenses: the cost of running the business
Everything below gross profit is the cost of being open. Typical lines include:
- Wages and salaries for admin and management staff, plus employer's National Insurance and pension contributions
- Rent, business rates, utilities and insurance
- Software subscriptions, phone and internet
- Marketing and advertising
- Accountancy, bookkeeping and legal fees
- Bank charges and card fees not already counted in cost of sales
- Depreciation of equipment, vehicles and fixtures
- Motor and travel costs
These are your overheads, and they are largely fixed. That is why a quiet month can wipe out a healthy gross profit. Track total overheads as a percentage of revenue: if the figure creeps above your normal range, find out why before it becomes a trend.
The profit lines, and what comes after them
Most P&Ls present a short ladder of profit figures.
- Operating profit — gross profit minus overheads. The result of trading, before finance and tax.
- Profit before tax — operating profit after interest paid and received. Usually the headline number.
- Profit after tax — what remains once corporation tax is provided for.
Sole traders and partnerships have no corporation tax line: profit is taxed through Self Assessment, and money taken out of the business is drawings, not an expense. If you trade through a limited company, corporation tax rates and thresholds change from time to time, so confirm the current position with your accountant rather than relying on a figure you remember.
A five-minute routine for reading your P&L
You do not need to analyse every line. Work through these in order and you will catch most of what matters.
- Compare this period with the last one and with the same period a year ago.
- Check the margins, not just the totals.
- Flag anything unusual — a one-off legal fee, a large stock purchase, a customer refund.
- Investigate any line that moved by more than 10% or so without an obvious reason.
- Tick the figures against your bank statements and balance sheet so you know nothing is missing.
If you have a budget, put the actual figures beside it. Variance is where the useful conversation starts.
Make it a monthly habit
A P&L produced once a year, weeks after the year ends, is a history lesson. One produced monthly is a steering wheel. Ask your accountant for monthly or quarterly management accounts if you do not already receive them, keep your bookkeeping current, and keep business and personal spending strictly separate.
You do not need to be an accountant to read a profit and loss statement well. You need to know which lines to watch, what good looks like in your business, and when to ask a question. If your circumstances are complicated — multiple companies, overseas sales, significant stock — take professional advice before acting on what you see.
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