A profit and loss statement, showing whether a business made a profit or ran at a loss over a specific period, is more useful than just the bottom-line figure suggests, and understanding what each section genuinely reveals helps a business owner make better decisions than looking at the final number alone.
These are the sections worth understanding and what they genuinely reveal.
Revenue tells you what’s actually coming in
The revenue line shows total money earned from sales before any costs are deducted, and tracking this over time genuinely reveals whether the business is actually growing, not just whether it happened to have one strong period.
Comparing revenue across comparable periods, not just against the previous single period, gives a more genuine sense of the underlying trend.
Cost of sales reveals genuine production efficiency
The direct costs of producing what was sold, materials, direct labour, show how efficiently the business is actually producing its core product or service, and tracking this against revenue reveals whether margins are genuinely improving or eroding over time.
A rising cost of sales relative to revenue is worth investigating specifically, rather than simply accepting it as unavoidable.
Operating expenses show what it genuinely costs to run the business
Overheads like rent, salaries and marketing, separate from direct production costs, reveal what it genuinely costs to keep the business operating regardless of sales volume, and understanding this helps identify where costs could realistically be reduced.
Our guide to improving business cash flow covers using this kind of expense visibility to actually improve financial health, not just observe it.
Net profit is the genuine bottom line, but not the only useful number
Net profit, what remains after all costs are deducted from revenue, is the headline figure, but the sections above it explain why that number is what it is, which matters far more for making an actual decision than the final figure alone.
Accurate P&L reporting also underpins tax compliance with the South African Revenue Service, making this discipline valuable well beyond internal decision-making alone.
Frequently asked questions
What does the revenue line in a P&L statement show?
Total money earned from sales before any costs are deducted, useful for tracking genuine growth over time.
What does cost of sales reveal?
How efficiently the business is producing its core product or service, and whether margins are improving or eroding.
What do operating expenses show?
What it genuinely costs to keep the business running regardless of sales volume, useful for identifying realistic cost reductions.
Is net profit the only useful number in a P&L statement?
No, the sections above it explain why that number is what it is, which matters more for decision-making than the final figure alone.
How often should a P&L statement be reviewed?
Regularly, as an ongoing planning tool, not just as a once-off report.
Further reading
Originally published in 2025. Updated September 2026 into a clearer, section-by-section explanation of how to genuinely read a profit and loss statement.
