How to Read a Cash Flow Statement

Founders often ask why the company shows a profit while the bank account shrinks, or a loss while cash grows. The answer is accrual accounting.

The Association for Financial Professionals gives the classic example: you may invoice a customer in April, but they may not pay you until June. Accrual accounting records the revenue in April. The cash flow statement records the cash in June. Expenses work the same way in reverse: you can record a bill this month and pay it next month.

Non-cash expenses widen the gap further. Depreciation and amortization spread the cost of a large purchase over its useful life, so they reduce profit every month even though the cash left the business once, on the day you bought the asset.

HBS Online makes the point that matters for decisions: your business can be profitable without being cash flow positive, and you can have positive cash flow without actually making a profit. A company does not fail because its profit is negative. It fails because it runs out of cash. That is why the cash flow statement deserves at least as much attention as the income statement.

There are two ways to present the operating section. The direct method lists actual cash receipts and payments. The indirect method starts with net income and adjusts it. Mercury notes that U.S. accounting guidance allows companies to use either method, and most use the indirect method. Yale shows that both methods produce the same operating cash flow; they only present it differently.

Since the indirect method is what you will usually see, learn to read it in three steps.

Step 1: Start with net income. This is the profit figure from the income statement.

Step 2: Add back non-cash items. The Corporate Finance Institute explains that non-cash expenses affect net income but do not involve actual cash movement, so they are added back. Depreciation and amortization are the common ones. Stock-based compensation is another one you will see in software companies. Gains on selling assets are subtracted here, because Ramp notes the full cash proceeds from the sale show up in investing activities instead.

Step 3: Adjust for working capital. Working capital is the short-term money tied up in running the business. Ramp's rules are the ones to memorize:

These follow Ramp's summary of when to subtract and when to add. Here is a small fictional software company as a worked example:

Operating activities (fictional SaaS, one quarter)
Net income                              -20,000
Add: depreciation and amortization        5,000
Add: stock-based compensation             8,000
Increase in accounts receivable         -30,000
Increase in accounts payable             10,000
Increase in deferred revenue             60,000
Cash from operating activities           33,000

The company lost money on paper and still generated cash, mostly because customers prepaid annual plans. That is good news for the bank balance, but read the next section before celebrating.

Investing activities show spending on assets that last more than a year and proceeds from selling them. The AFP describes it as cash flow from changes in fixed assets and short-term investments: buying equipment is an outflow, selling it is an inflow. For a software business this section is usually small: laptops, servers, sometimes capitalized development costs or an acquisition. A negative investing number is normal and often healthy, because it means the company is building capacity.

Financing activities show cash moving between the company and the people who fund it. The AFP lists equity issuance and debt financing as inflows, and debt repayment and distributions to shareholders as outflows. A seed or Series A round shows up here as a large positive number. Loan repayments and owner distributions show up as negatives.

One distinction trips people up. Interest and loan principal are treated differently, and classification rules vary between accounting frameworks. If you see interest in an unexpected section, ask your accountant which rule the statement follows before you compare it with another company's.

Free cash flow is the cash left after the business pays to run and maintain itself. The Corporate Finance Institute gives the generic formula:

Free cash flow = Cash from operating activities - Capital expenditures

CFI describes free cash flow as the cash a company can produce after deducting the purchase of assets such as property, equipment and other major investments from its operating cash flow. It also notes that free cash flow can be defined and calculated in many ways, with "levered" and "unlevered" variants that treat debt payments differently. When someone quotes a free cash flow number, ask which definition they used.

For a founder, free cash flow answers a simple question: if no new money came in from investors or lenders, would the business be gaining or losing cash? Negative free cash flow divided into your current cash balance gives a rough runway. Positive free cash flow means the business funds itself.

Single numbers tell you little. The signs of the three sections together tell you what kind of business you are looking at. HBS Online notes that cash flow statements can reveal what phase a business is in, from a fast-growing startup to a mature company or one in decline.

Two comparisons add depth. First, compare operating cash flow with net income. HBS Online says that ideally, cash from operating income should routinely exceed net income. Second, compare periods. One quarter can be distorted by a large annual invoice or a tax payment. Four to eight quarters show the trend.

Subscription businesses need one extra caution. Mercury points out that a SaaS company collecting a full year of subscription fees upfront shows a big cash boost today, even though that revenue is earned month by month. The deferred revenue line in the example above is that effect. It is real cash, but it comes with an obligation to deliver twelve months of service. If annual prepayments slow down, operating cash flow can fall sharply even while revenue keeps growing.

Mercury lists warning signs worth checking on any statement:

• Consistent negative operating cash flow beyond the early stage.
• Heavy reliance on financing cash flow to stay afloat.
• Large, unexplained swings between periods.
• A persistent gap where earnings outpace operating cash flow, which can point to collection problems or aggressive revenue recognition.
• High capital spending that does not lead to growth.

Use this routine every month or quarter:

1. Check the identity. Opening cash plus the three sections should equal closing cash.
2. Read operating cash first. Is it positive? Is it bigger or smaller than net income, and why?
3. Find the biggest working capital line. A jump in receivables means customers are paying slower. A jump in deferred revenue means prepayments you still have to earn.
4. Scan investing. Is spending in line with plans?
5. Scan financing. How much of the cash came from investors or lenders rather than customers?
6. Calculate free cash flow and runway. Operating cash minus capital spending, then months of cash left at that rate.
7. Compare with last period and the same period last year. Trends matter more than levels.

If you cannot explain a line, ask your bookkeeper or accountant before you act on it. The statement is only as good as the classification behind it.