Accounting Questions in IB Interviews: The Complete Deep-Dive

Accounting is where technical rounds start and where most candidates are separated. It is not tested because bankers love debits and credits; it is tested because every valuation, merger model, and LBO is built out of the three statements, and an interviewer can measure your foundations in ninety seconds by walking you through one change.

This deep-dive covers what actually gets asked: the three statements and their links, the classic change walkthroughs with the math done exactly, the concepts that generate follow-ups, and the red flags interviewers deliberately probe for.

The three statements in interview language

You need a crisp thirty-second version of each statement — what it measures, over what timeframe, and its key lines. Precision beats completeness here.

• Income statement: profitability over a period. Revenue down to net income through COGS, operating expenses, D&A (sometimes embedded in COGS/opex), interest, and taxes. Accrual-based, so it is not cash.
• Balance sheet: a snapshot at a point in time. Assets equal liabilities plus shareholders' equity, always. Key working parts for interviews: cash, receivables, inventory, PP&E, debt, payables, retained earnings.
• Cash flow statement: the bridge from accrual world back to cash over a period. Operating (start from net income, add back non-cash items, adjust for working capital), investing (capex, acquisitions), financing (debt, dividends, buybacks). Ends at the change in cash.

How the statements link

The linking question is asked constantly because it verifies you see one system, not three documents. The three core connections: net income from the income statement is the starting line of the cash flow statement and flows into retained earnings on the balance sheet; the ending cash from the cash flow statement is the cash line on the balance sheet; and changes in balance sheet items show up as working capital, investing, and financing lines on the cash flow statement.

A clean spoken version: the income statement produces net income; the cash flow statement starts with net income, adjusts for non-cash items and balance sheet changes, and produces the change in cash; the balance sheet absorbs both — cash updates from the cash flow statement, retained earnings updates from net income less dividends, and everything must still balance.

The depreciation walkthrough, with exact math

The canonical question: depreciation goes up by 10 dollars — walk me through the three statements. Always state a tax rate first; 40 percent is the classic teaching assumption, though many interviewers now use 25 or 21 percent, so confirm. At 40 percent:

Check that it ties: assets are down 6 in total (cash up 4, net PP&E down 10), and liabilities plus equity are down 6 (retained earnings down 6 via net income). The balance sheet balances. The two most common errors are forgetting the tax shield — claiming net income falls by the full 10 — and concluding cash goes down, when in fact cash rises by the tax savings because depreciation itself is non-cash.

1. 01Income statement: pre-tax income falls by 10; taxes fall by 4 (40 percent of 10); net income falls by 6
2. 02Cash flow statement: start with net income down 6; add back the 10 of depreciation because it is non-cash; net change in cash is up 4
3. 03Balance sheet: cash up 4 and net PP&E down 10, so total assets down 6; retained earnings down 6 through net income, so the sheet balances

The other walkthroughs worth drilling

Depreciation is the opener; strong interviewers then vary the change to see if you have a method or a memorized answer. The method is always the same: hit the income statement first (with the tax effect), run the cash flow statement, then rebuild the balance sheet and confirm it balances.

• Inventory write-down: like depreciation, a non-cash pre-tax charge — net income falls by the after-tax amount, the write-down is added back on the cash flow statement, inventory falls on the balance sheet
• Receivables increase by 10 (a sale on credit at the moment of accrual vs collection): revenue and pre-tax income up now, but the working capital line on the cash flow statement absorbs the uncollected cash
• Buying equipment with debt: no income statement impact at purchase; investing outflow for capex, financing inflow for debt; PP&E and debt both rise — the income statement gets hit later through depreciation and interest
• Prepaid expense and deferred revenue changes: timing mismatches between cash and recognition, each traced through working capital
• Multi-period versions: what happens in year 2 — depreciation keeps running, and interviewers check you track cumulative effects

Concepts that generate follow-ups

Beyond walkthroughs, a handful of accounting concepts do the heavy lifting in follow-up questions. Deferred taxes arise when book and tax accounting recognize items on different schedules — classically accelerated tax depreciation creating a deferred tax liability. Goodwill and intangibles matter for M&A questions later. And the difference between capitalizing and expensing a cost determines whether it hits the income statement immediately or trickles through as depreciation or amortization.

Also be ready for the judgment layer: which statement is most important (a common answer is the cash flow statement, because cash is hardest to manipulate and closest to value, but argue it rather than assert it), and how a company can show positive net income while burning cash — receivables and inventory ballooning, heavy capitalized costs — or the reverse.

Red flags interviewers probe for

Interviewers have a short list of tells that a candidate's accounting is memorized rather than understood, and they steer toward them deliberately.

• No tax effect: any walkthrough where a pre-tax change hits net income dollar-for-dollar
• Wrong working capital signs: not knowing that rising receivables or inventory consume cash while rising payables release it
• A balance sheet that does not balance: finishing a walkthrough without checking assets against liabilities plus equity
• Confusing cash and profit: treating net income as money in the bank, or capex as an income statement expense at purchase
• One-way knowledge: handling depreciation up 10 but stalling when the interviewer flips it to down 10 or moves to year 2
• Not knowing where D&A lives: it may sit inside COGS or operating expenses rather than as its own line, which is why you add back the full amount from the cash flow statement

How to drill accounting until it is automatic

Accounting rewards short daily reps more than any other topic, because the walkthroughs are procedural. Do one spoken walkthrough per day, rotating the change and occasionally the tax rate, plus a mixed question set. In two weeks the method becomes reflexive, and every downstream topic — DCF, M&A, LBO — gets easier because it borrows this machinery.

If you want the reps served to you, the accounting questions in WACC Buddy's Daily 10 rotate exactly these walkthroughs and follow-ups on a spaced schedule; the free Top 50 guide has the full written answers to check yourself against.

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