What Is Cash Flow?

Your business is profitable. So why is the bank account running low? That gap between profit and cash is exactly what cash flow explains, and most professionals never learn to read it.

Cash flow is the net movement of real money into and out of your business over a set period. Not what you earned. Not what you invoiced. What actually moved. Net cash flow is simple: total cash in, minus total cash out. Positive means more came in than went out. Negative means the opposite. It sounds straightforward, but the reason it catches people out is timing, and that is where the gap with profit opens up.

Here is the thing most professionals miss. Profit is recorded when you earn it. Cash flow is recorded when the money actually arrives. Say you close a deal in March and invoice for fifty thousand pounds. That goes straight onto your profit and loss as revenue. But if your client pays on 60-day terms, the cash does not hit your account until May. In the meantime, you still have payroll, rent, and supplier bills due in April. The business is profitable on paper and short on cash in reality.

A cash flow statement breaks the picture into three parts, and each one tells a different story. Operating cash flow: does the core business actually generate real cash day to day? Investing cash flow: what is the business spending on or selling in terms of assets and long-term investments? Financing cash flow: how is the business funded, and is it repaying debt or returning money to shareholders? You need all three to understand what is really happening. A business can look fine in one area and be in trouble in another.

Operating cash flow shows whether the day-to-day business generates real cash, independent of accounting profit. It includes cash from sales, minus cash paid for wages, rent, suppliers, and other running costs. If this number is consistently positive, the core business is self-sustaining. If it is negative, the business is burning cash to operate, even if the profit and loss statement looks healthy. This is the number to watch first. A growing business can have negative investing or financing cash flow for good reasons.

Investing cash flow tracks money spent on or received from long-term assets: buying equipment, acquiring a business, selling property. A negative figure here often means the business is investing in growth, not struggling. Context matters before you draw a conclusion. Financing cash flow covers how the business is funded: loans taken out, loans repaid, equity raised, dividends paid. A negative financing figure might mean the business is paying down debt, which is a sign of financial health, not weakness.

So here is the practical rule of thumb. If profit is growing but your cash balance is shrinking, do not assume the business model is broken. Look first at three things: receivables, meaning customers who owe you money but have not paid yet; payables, meaning how quickly you are paying suppliers; and investment activity, meaning whether a large asset purchase is draining the account.

One honest caveat. Cash flow is a powerful input, but it is one of three core financial statements, alongside the profit and loss account and the balance sheet. It tells you about liquidity and timing. It does not tell you about profitability trends, asset values, or long-term financial position on its own.

The next time you review business performance, open the cash flow statement alongside the profit and loss. Check whether operating cash flow is positive. If profit is up but cash is down, go straight to receivables, payables, and any recent investment activity. This is not just a job for the finance team. Any professional who makes business decisions needs to be able to read both.

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