How the statements connect
Read firstThe three statements. Valuation without accounting is memorization.
The question gets asked in almost every finance interview, and most people who fail it do not fail on the arithmetic. They fail because they learned three separate statements and never learned that there are not three. There is one system of accounts with three views onto it, and every entry lands in at least two places.
The loop, stated once
Three connections do all the work. Learn these and you can derive the rest.
- is the first line of the . Whatever the concluded becomes the starting point for the cash reconciliation.
- Ending cash from the cash flow statement is the cash line on the . Not approximately. The same number.
- Net income less is added to . That is how the income statement reaches the balance sheet, and it is why moves when profit does.
Everything else is bookkeeping around those three. If the balance sheet does not balance after a change, one of the three broke, and the fastest way to find it is to check them in that order.
The identity that has to hold
The depreciation case, in full
Depreciation increases by $10. The tax rate is 25%. Nothing else changes. Work it in the order the money moves.
Those figures are computed by the same code the tests check, not typed into the page. The test file asserts each one to the cent and then runs 200 randomized magnitudes and tax rates through every transaction on this page to confirm the balance sheet still balances. A finance site with a wrong identity in it is worse than no site.
Run it yourself
Pick a transaction, set the amount and tax rate, and watch it move through in order. Quiz mode hides the last two statements and asks you to produce them, which is the exact drill that gets tested.
Two cases that catch people out
Buying inventory with cash does nothing to profit. Spend $10 on stock and the income statement does not move at all. Cash falls -$10.00, rises $10.00, and total assets are flat. The cost waits on the balance sheet until the item sells, and only then does it become . People answer this one by reaching for an expense that is not there.
Revenue you have not collected makes cash go down. Deliver $50 of goods on credit and net income rises $37.50. But rose $50, which is an asset going up, so drags -$50.00 and operating cash flow ends at -$12.50. Profit up, cash down, same period, no fraud. This single entry is the reason the cash flow statement exists.
ConventionWorking capital signs are the most common place to go wrong. An asset going up uses cash, so it is negative on the cash flow statement. A liability going up provides cash, so it is positive. If that feels backwards, remember that inventory sitting on a shelf is money you already spent.
What to do when it does not balance
In a real model it will not, and the fix is a routine rather than an insight. Check in this order.
- Does ending cash on the cash flow statement equal the cash line on the balance sheet? If not, the link is broken and nothing else matters yet.
- Did retained earnings move by net income less dividends? A retained earnings roll-forward that does not tie is the second most common cause.
- Is every balance sheet change either in working capital on the cash flow statement, or in investing, or in financing? An asset that moves with no corresponding cash line is a missing entry.
- Is anything counted twice? Usually a that also moved a working capital line.
The amount you are out by tells you where to look. Out by exactly the depreciation figure means a missing add-back. Out by exactly net income means retained earnings never got updated. Out by twice something means you counted it in both directions.
Test yourself
01Depreciation goes up by $10. Walk me through the three statements. Assume a 25% tax rate.
Income statement: depreciation is an expense, so pretax income falls $10 and net income falls $7.50 after the tax shield.
Cash flow statement: start at net income of negative $7.50, add back the full $10 of depreciation because no cash left, so cash from operations rises $2.50. No investing or financing effect, so cash rises $2.50.
Balance sheet: cash up $2.50, PP&E down $10, so assets fall $7.50. Retained earnings fall $7.50 with net income. Assets down $7.50, equity down $7.50. Balanced.
The follow-up is always the same: why did cash go up on a loss? Because the only thing that actually happened was a $2.50 tax deduction. Depreciation is the accounting for cash that left in an earlier year.
02A company buys $100 of equipment funded entirely by new debt. What happens on day one, and what happens in year one?
Day one: nothing on the income statement. Investing shows $100 out, financing shows $100 in, so cash is flat. PP&E up $100, debt up $100. Assets and liabilities both grow by $100.
Year one, straight line over ten years at 5% interest: $10 of depreciation and $5 of interest cut pretax income $15 and net income $11.25. Add back the $10 of depreciation and operating cash flow falls $1.25. PP&E falls $10, cash falls $1.25, retained earnings fall $11.25. Still balanced.
Note what did not happen: repaying principal. That is a financing outflow and it never touches the income statement, which is why a company can be profitable and still fail to meet a maturity.
03Inventory is written down by $30. Why is operating cash flow up rather than flat?
The charge cuts net income by $22.50 after tax, and the full $30 is added back as a non-cash item, leaving $7.50. That $7.50 is exactly the tax saving. The trap in this question is adding the inventory decline as a working capital source on top of the add-back, which double counts it and produces $37.50. Inventory fell because it was written off, not because it was sold.
04Goodwill is impaired by $30. How is that different from the write-down above?
Goodwill impairment is generally not deductible, so there is no tax shield. Net income falls by the full $30, the full $30 is added back, and operating cash flow does not move at all. Cash is completely unchanged. If your answer to any impairment question involves cash going up, check whether the charge is deductible first.
A tutor that knows this lesson. It asks before it explains, and it will not tell you what to do with your own money.
Every figure in this lesson that names a company comes from Target Corporation's Form 10-K for Fiscal 2025, the year ended 2026-01-31, filed 2026-03-11. Educational material, not investment advice.