Operating Cash Flow: What It Is and How to Calculate It
Operating cash flow (OCF) is the cash a company's core business generated during a period, before any spending on equipment or long-term investments is subtracted. It sits one step upstream of free cash flow, which is OCF minus capital expenditures. This article focuses on where OCF itself comes from: how a company gets from net income, an accounting figure, to a cash figure.
The Operating Cash Flow Formula (Indirect Method)
Most companies report OCF using the indirect method, which starts from net income and adjusts it for the ways accounting profit differs from actual cash movement:
Operating Cash Flow = Net Income + Non-Cash Expenses ± Changes in Working Capital
- Non-cash expenses (mainly depreciation and amortization) are added back because they reduced net income on paper but never involved cash actually leaving the business.
- Changes in working capital capture the timing gap between when revenue/expenses are recorded and when the cash actually moves: money tied up in unpaid customer invoices (accounts receivable), unsold inventory, or unpaid supplier bills (accounts payable) all shift OCF up or down relative to net income.
Worked Example
Say a company reports:
- Net income: €10 million
- Depreciation & amortization: €4 million
- Increase in accounts receivable: −€2 million (cash tied up in unpaid customer invoices)
- Increase in accounts payable: +€1 million (cash kept longer before paying suppliers)
Operating Cash Flow = €10M + €4M − €2M + €1M = €13 million
Net income was €10 million, but the business actually generated €13 million in cash. Depreciation added back more than the working capital changes took away.
What OCF Tells You That Net Income Doesn't
The gap between net income and OCF is often more informative than either number alone:
- OCF consistently higher than net income is common and usually healthy. It typically means depreciation (a real but non-cash cost) is doing a lot of the work, which is normal for asset-heavy businesses.
- OCF consistently lower than net income, especially if the gap is growing, is worth investigating. It can mean the company is extending more credit to customers than it's collecting, sitting on more unsold inventory, or paying suppliers faster than it's being paid. None of that shows up in net income, but all of it is cash quietly leaving the business.
- A company with positive net income but negative OCF over a sustained period is a genuine warning sign: profitable on paper, but not actually generating cash from operations.
Where This Can Mislead You
Working capital swings are often temporary, not structural. A single quarter's spike in accounts receivable might reflect one large late-paying customer rather than a deteriorating business. Look at the trend over several periods rather than reading one period as definitive.
Non-cash add-backs aren't always as "non-cash" as they look. Depreciation reflects real wear on real assets that will eventually need replacing, so adding it back tells you about this period's cash, not about the company's ongoing need to keep spending on equipment. That's exactly why free cash flow subtracts capital expenditures back out: OCF alone can overstate how much cash is genuinely available to shareholders.
Some companies manage working capital aggressively right before reporting dates. Delaying supplier payments or pushing for faster customer collections right before quarter-end can flatter OCF temporarily without reflecting a real operational change. This is one of the more common short-term levers pulled to hit a number.
Related Reading
- Free Cash Flow (FCF): OCF minus capital expenditures; the next step in seeing how much cash is genuinely available to the company
- Earnings Per Share (EPS): the net-income-based starting point this formula adjusts from
- Return on Equity (ROE): another net-income-based metric worth comparing against the cash-based view here
- What Is Shareholder Equity?: the balance-sheet side of the picture this cash flow statement complements
- Investing Cash Flow: the next section of the cash flow statement, covering where the cash goes after operations
- Financing Cash Flow: the third section of the cash flow statement, covering how the company funds itself
- How to Read a Cash Flow Statement: how the three sections fit together and what the patterns across them mean
Nothing on this site is financial advice. It's a personal record of my own research and decisions, shared for transparency, not as a recommendation to buy or sell anything.