Do you know that number that appears in financial news and everyone wants to know? Well, net profit is basically what’s truly left for the company after it pays all its bills. Revenue minus everything that leaves the cash flow: salaries, rent, taxes, raw materials... what remains is net profit. Simple as that.

Now, here’s the detail that many people ignore: revenue is not profit. A company can generate billions in sales and still not have a single cent of real profit. That’s why investors keep an eye on this indicator. It shows whether the operation actually generates returns or if it’s just money movement.

But there’s an important catch. Net profit doesn’t mean cash in hand. This happens because accounting works on the accrual basis. A sale on credit is recorded as revenue, but the money only arrives later. So, a company can have high net profit and be liquidity broke. That’s why it’s always worth checking the cash flow and the balance sheet as well.

Calculating it is straightforward: take total revenue, subtract variable costs, then fixed expenses and taxes. What’s left is net profit. Simple. Example: a company sells 10,000 units at R$ 5 each (R$ 50,000 in revenue), spends R$ 14,000 on variable costs and R$ 12,000 on fixed expenses. Result: R$ 24,000 in net profit for the month.

Now, how much net profit is good? There’s no magic number. It varies a lot by sector. A bank might have a margin of 15 to 30%, while a retail store stays between 1 and 5%. Technology usually ranges from 15 to 30%, energy is stable at 10 to 20%, mining can reach 15 to 35% depending on commodity cycles. Each segment has its reality.

Looking at the Brazilian market, you can see this clearly in practice. Itaú has net profit above R$ 35 billion annually because banks operate with scale and financial spreads. Petrobras varies wildly depending on oil prices, reaching R$ 100 billion in good years and posting losses in others. Vale follows the same logic with iron ore. Magazine Luiza maintains tight profits because retail is like that—preferring growth over profitability. Engie has predictable profit because energy is a stable business. Totvs grows consistently because software benefits from economies of scale.

The net profit margin is the percentage that shows how much of the revenue turns into real profit. Formula: (net profit ÷ revenue) × 100. This helps understand if the company is efficient, if costs are under control, and if the business model holds up.

There’s also NOPAT (operating profit after taxes) and adjusted profit, which exclude one-time effects. These are useful for more precise comparisons between periods.

In the end, net profit is the thermometer of financial health. Before investing in anything, it’s worth analyzing this number along with margin, debt levels, cash generation, and sector prospects. Quality information and a long-term vision build a solid strategy.