The Cash Flow Statement Line by Line: CFO, CFI and CFF Explained for IB Interviews

If an interviewer asks you to "walk me through the cash flow statement," they're not testing whether you memorized a definition. They want to see if you understand why each line is there and which way it moves cash.

This post goes through the statement one line at a time, across all three sections: Cash Flow from Operations (CFO), Cash Flow from Investing (CFI) and Cash Flow from Financing (CFF). You'll also get a full worked example with numbers you can rebuild yourself, plus the interview questions that come up again and again.

Why the Cash Flow Statement Matters So Much

The income statement tells you whether a company is profitable on an accrual basis. The balance sheet tells you what it owns and owes at a point in time. Neither one tells you how much actual cash came in or went out.

That's the job of the cash flow statement. It also links the other two statements together, which is exactly why it shows up in so many technical questions.

The Big Picture Before the Details

Almost every company you'll see in banking uses the indirect method. That means the statement:

• Starts with net income from the income statement
• Adjusts for non-cash items that hit net income but didn't move cash
• Adjusts for changes in working capital from the balance sheet
• Then adds investing and financing activities

The three sections add up to the net change in cash. Add that to beginning cash and you get ending cash, which must match the cash line on the balance sheet.

Section 1: Cash Flow from Operations (CFO)

CFO answers one question: how much cash did the core business generate? Here's each line and the logic behind it.

Net Income

This is your starting point. It's profit after all expenses, interest and taxes. The problem is that it includes items that aren't cash, so we need to fix it.

Depreciation and Amortization (D&A)

D&A reduces net income, but no cash leaves the company when you record it. The cash went out years ago when the asset was bought (and that showed up as capex).

So you add D&A back.

Stock-Based Compensation (SBC)

Paying employees in shares is a real expense that lowers net income. But you didn't hand over cash, you handed over stock.

So you add SBC back. (Quick note: shareholders still get diluted, so don't call SBC "free." Interviewers like hearing that nuance.)

Deferred Taxes

Sometimes the tax expense on the income statement is higher than the taxes the company actually paid in cash. The difference often shows up as an increase in a deferred tax liability.

• Increase in deferred tax liability: add it back (you expensed more than you paid)
• Increase in deferred tax asset: subtract it (you paid more than you expensed)

Gains and Losses on Asset Sales

Say you sell a piece of equipment and book a gain. That gain boosts net income, but the full cash proceeds belong in investing, not operations.

• Gain on sale: subtract it, so you don't count it twice
• Loss on sale: add it back

Impairments and Write-Downs

These are non-cash charges that reduce net income. Add them back, just like D&A.

Changes in Operating Working Capital

This is where most candidates trip up. The rule is simple once it clicks:

• An operating asset goes up → cash goes down
• An operating liability goes up → cash goes up

Here's how that plays out line by line:

• Accounts receivable up: you booked revenue but haven't collected the cash yet. Subtract.
• Inventory up: you spent cash buying products you haven't sold. Subtract.
• Prepaid expenses up: you paid cash in advance for something not yet expensed. Subtract.
• Accounts payable up: you recorded the expense but haven't paid the supplier. Add.
• Accrued expenses up: same logic as payables, the bill is owed but not paid. Add.
• Deferred revenue up: a customer paid you before you delivered. Add.

Flip the sign if the balance goes down. If AR falls, you collected cash, so it's a positive.

Section 2: Cash Flow from Investing (CFI)

CFI shows cash spent on, or received from, long-term assets and investments. For most companies this section is negative, because healthy businesses keep investing.

Capital Expenditures (Capex)

Cash spent buying property, plant and equipment. It's usually the biggest line in CFI and it's always a cash outflow.

Capex doesn't hit the income statement right away. It sits on the balance sheet and gets expensed gradually through depreciation.

Acquisitions

Cash paid to buy other companies, usually shown net of the cash acquired. Outflow.

Proceeds from Sale of Assets

The full cash you received from selling equipment, a building or a business. Inflow. (Remember, you removed the gain from CFO, so here you capture all the cash.)

Purchases and Sales of Investments

Buying securities like marketable investments is an outflow. Selling them is an inflow.

Section 3: Cash Flow from Financing (CFF)

CFF tracks cash moving between the company and the people who fund it: lenders and shareholders.

Debt Issuance

Borrowing money brings cash in. Inflow.

Debt Repayment

Paying back principal sends cash out. Outflow. (Interest is different, more on that below.)

Equity Issuance

Selling new shares raises cash. Inflow.

Share Buybacks

Repurchasing your own stock uses cash. Outflow.

Dividends Paid

Cash returned to shareholders. Outflow.

A Full Worked Example

Let's build a cash flow statement for a made-up company. All figures in millions.

Facts for the year:

• Net income was $100
• D&A was $30 and SBC was $10
• The company sold equipment with a book value of $15 for $20, booking a $5 gain
• Deferred tax liability increased by $4
• AR rose $15, inventory rose $10, AP rose $8, deferred revenue rose $6
• Capex was $50, and it bought $12 of investments
• It issued $40 of debt and repaid $25
• It bought back $30 of stock and paid $20 in dividends
• Beginning cash was $200

CFO

CFI

CFF

Putting It Together

• Net change in cash: 128 − 42 − 35 = 51
• Ending cash: 200 + 51 = 251

That $251 is what you'd see on the year-end balance sheet. Notice how the $5 gain came out of CFO while the full $20 of proceeds landed in CFI. No double counting.

Bonus: a quick free cash flow figure here is CFO minus capex, so 128 − 50 = $78. You'll use that idea constantly in valuation.

Interview Questions You Should Nail

"Depreciation goes up by $10. Walk me through the statements."

Assume a 40% tax rate.

• Income statement: operating income falls $10, so net income falls $10 × (1 − 0.4) = $6
• Cash flow statement: net income down $6, add back $10 of D&A, so cash is up $4
• Balance sheet: cash up $4, PP&E down $10, so assets fall $6. Retained earnings fall $6, so the balance sheet balances

The cash goes up because depreciation lowers your tax bill, even though depreciation itself isn't a cash expense.

"Where does interest show up?"

Under US GAAP, interest paid sits in CFO, because it already reduced net income. Only the principal repayment goes in CFF. Dividends paid go in CFF.

Under IFRS, companies have some flexibility in where they classify interest and dividends paid, so check the filing if you're comparing companies across standards.

"Can a profitable company run out of cash?"

Absolutely. A fast-growing company might show strong net income while AR and inventory balloon, dragging CFO negative. Add heavy capex and it could burn cash despite healthy profits. This is a great answer because it shows you get why the cash flow statement exists.

"Which section matters most?"

Most bankers point to CFO, because it shows whether the core business actually generates cash. Then they look at capex to get to free cash flow.

Common Mistakes to Avoid

• Getting working capital signs backwards. Say it out loud: "asset up, cash down."
• Forgetting to remove gains on asset sales from CFO. That double counts the cash.
• Putting interest paid in CFF under US GAAP. It belongs in CFO.
• Putting capex on the income statement. It flows through the balance sheet and gets depreciated over time.
• Forgetting that ending cash must tie to the balance sheet. That's your sanity check every time.

The Takeaway

The cash flow statement isn't a list to memorize. Every line exists for one reason: to turn accrual-based net income into actual cash, then show where cash went for investments and financing.

Rebuild the worked example above on a blank sheet of paper without peeking. If you can do that and explain each sign, you're ready for any "walk me through the cash flow statement" question an interviewer throws at you.