“Walk me through the cash flow statement” is a staple of first-round interviews. It sounds easy, because everyone knows cash comes in and goes out. But the question is really a test of whether you understand why net income and cash are different, and whether you can describe three sections in the right order without losing the thread.
Below is a line-by-line pass through a small example. Every number is made up and kept simple so you can follow the logic and then say it aloud.
What the Statement Is For
The income statement shows profit, but profit is calculated using accounting rules. Revenue can be recorded before cash arrives, and expenses like depreciation reduce profit without any cash leaving. The cash flow statement fixes that by tracing what actually happened to cash during the period.
It starts with net income and ends with the change in cash on the balance sheet. In between, it has three sections:
- Cash flow from operating activities (CFO): cash generated by running the business.
- Cash flow from investing activities (CFI): cash spent on or received from long-term assets and investments.
- Cash flow from financing activities (CFF): cash raised from or returned to lenders and shareholders.
Add the three together and you get the net change in cash. That is the whole structure. Our post on how the three statements link together shows where each line comes from.
The Example Company
Here is the information we will use, in millions of dollars. The company starts the year with $80 in cash.
- Net income: $100
- Depreciation and amortization: $30
- Stock-based compensation: $10
- Accounts receivable increased by $15
- Inventory increased by $10
- Accounts payable increased by $12
- Deferred revenue increased by $3
- Capital expenditures: $40
- Acquisition of a smaller business: $25
- Proceeds from selling an old building: $5
- New debt issued: $50
- Debt repaid: $20
- Share repurchases: $30
- Dividends paid: $10
Your job is to sort each item into the right section and give the total for each.
Operating Activities, Line by Line
Start with net income of $100. The goal in this section is to adjust it from an accounting number to a cash number. This is called the indirect method, which is what nearly all companies use.
Non-cash charges are added back.
- Depreciation and amortization: add $30. These reduce net income but no cash left this period. The cash left when the asset was bought.
- Stock-based compensation: add $10. The company paid employees in shares rather than cash, so the expense reduced profit without using cash.
Changes in working capital are adjusted. The rule is simple. If a current asset goes up, cash goes down. If a current liability goes up, cash goes up.
- Accounts receivable up $15: subtract $15. Customers owe more, so the company has recorded revenue it has not yet collected.
- Inventory up $10: subtract $10. The company spent cash on goods that are still on the shelf.
- Accounts payable up $12: add $12. The company bought on credit and has not paid yet, so it held on to cash.
- Deferred revenue up $3: add $3. Customers paid in advance for something not yet delivered, so cash arrived before revenue was recognized.
Add it up: 100 plus 30 plus 10 minus 15 minus 10 plus 12 plus 3 equals $130. Cash from operations is $130, higher than net income because of the non-cash charges.
Deferred revenue is a liability on the balance sheet, because the company owes the customer a product or service, but the cash has already arrived, which is why it adds to operating cash flow.
Investing Activities, Line by Line
The investing section covers money spent on or received from long-term assets. For most industrial and tech companies, this section is usually negative because they keep investing in the business.
- Capital expenditures: subtract $40. This is cash spent on equipment, buildings or software.
- Acquisition of a business: subtract $25. Cash paid to buy another company is an investment.
- Proceeds from selling the old building: add $5. Selling an asset brings cash in. Assume it sold at book value, so there is no gain or loss to adjust in the operating section.
Total: negative 40 minus 25 plus 5 equals negative $60. Cash from investing is minus $60. A negative number here is not a warning sign by itself. A company that is spending to grow often shows a negative investing section.
Financing Activities, Line by Line
The financing section covers how the company raises and returns capital.
- New debt issued: add $50. Borrowing brings cash in.
- Debt repaid: subtract $20. Principal payments reduce cash.
- Share repurchases: subtract $30. Buying back stock returns cash to shareholders.
- Dividends paid: subtract $10. Same idea.
Total: 50 minus 20 minus 30 minus 10 equals negative $10. Cash from financing is minus $10.
Notice that interest expense is not here. Under U.S. accounting rules, interest paid generally appears in the operating section, because it is part of net income. Principal repayment is financing. If an interviewer asks about this, that is the distinction to give.
Putting the Three Sections Together
Now add the sections:
- Cash from operations: $130
- Cash from investing: negative $60
- Cash from financing: negative $10
Net change in cash: 130 minus 60 minus 10 equals $60.
The company began the year with $80 in cash, so it ends with $140. That ending figure must match the cash line on the balance sheet. If it does not, there is an error somewhere, and checking this tie is a habit worth building. Our guide on building a three-statement model shows how modelers link it.
A useful extra: free cash flow, a simple version of which is cash from operations minus capital expenditures. Here that is 130 minus 40, or $90. See our explanation of free cash flow for how bankers use it.
Mistakes that cost points
Sign errors are the easiest mistake to make on this question. Watch for these:
- Treating a rise in a current asset as a source of cash. It is a use.
- Adding back working capital changes in the wrong direction. A quick check: ask whether the company ended up holding more or less cash because of the change.
- Putting stock repurchases in operations or investing. They belong in financing.
- Forgetting that acquisitions are an investing outflow.
- Mixing up the statement’s starting point. It begins with net income, not with revenue or EBITDA.
The Thirty-Second Spoken Version
Interviewers want a short answer. Here is a script you can adapt:
“The cash flow statement starts with net income and ends with the change in cash. In operating activities, I add back non-cash items like depreciation and stock-based compensation, then adjust for working capital: rising current assets use cash, and rising current liabilities provide it. Investing covers capital expenditures, acquisitions and asset sales. Financing covers debt issued or repaid, share repurchases and dividends. The three sections add up to the net change in cash, which ties to the balance sheet.”
That is about thirty seconds. If the interviewer wants more, they will ask. Resist the urge to explain every possible line.
Follow-Up Questions to Expect
After the walk-through, interviewers often probe. Here are common ones, with short answers.
- Why add back depreciation? It lowers net income but does not use cash in the period, so we reverse it to get to actual cash.
- Why is an increase in inventory a use of cash? The company paid for goods it has not yet sold, so cash left without revenue arriving.
- What is the difference between net income and operating cash flow? Non-cash items and working capital changes. A company can be profitable and still run low on cash if receivables grow fast.
- Where does a dividend appear? In financing, as a use of cash.
- If a company has negative operating cash flow, is that a problem? It can be, especially if it continues for several periods, but young companies sometimes burn cash on purpose to grow, and the answer depends on how the company is funded.
- How do you use the statement in a DCF? Free cash flow is built from items on it. See our DCF walk-through for the next step.
Drill yourself with variations
Once the base case feels automatic, change one number and redo the totals. This builds the flexibility interviewers test for.
- Suppose receivables rose by $25 instead of $15. Operating cash flow drops by $10 to $120, and the ending cash is $130 instead of $140.
- Suppose the company repaid $50 of debt instead of $20. Financing becomes negative $40, and ending cash is $110.
- Suppose it skipped the acquisition. Investing becomes negative $35, and ending cash is $165.
Each variation takes under a minute, and it forces you to reason about direction instead of memorizing totals. Do three or four of them out loud each time you practice.
Key Takeaways
- The cash flow statement starts with net income and reconciles it to the change in cash through three sections: operations, investing and financing.
- In operations, add back non-cash charges and adjust for working capital: rising current assets use cash, and rising current liabilities provide it.
- Investing covers long-term assets such as capital expenditures and acquisitions, and financing covers debt, buybacks and dividends.
- The three totals add to the net change in cash, and the ending cash must match the balance sheet.
- Practice the thirty-second version aloud with a small example until it comes out in order.
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Related Articles
- How the Three Financial Statements Link Together (IB Interview Guide)
- Free Cash Flow: How to Calculate It and Why Investment Banks Care
- How to Calculate Unlevered Free Cash Flow for a DCF
- Walk Me Through a DCF: How to Nail This Investment Banking Interview Question
- How to Build a 3-Statement Financial Model: Complete Guide
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