Accounting Interview Questions: The Complete IB Guide

Accounting is the first technical gate in every investment banking interview. Before anyone asks you about a DCF or an LBO, they will check whether you can move a number through the three financial statements without hesitating. If you fumble here, the interviewer stops listening to everything else, because valuation, merger models, and leveraged buyouts are all built on top of these mechanics.

The good news: the accounting tested in IB interviews is a narrow, learnable slice of the subject. You do not need to be a CPA. You need the three statements, how they link, and a dozen recurring scenarios drilled until the answers are automatic. This guide covers exactly that, and the real bank questions below the article let you test yourself immediately.

What Interviewers Actually Test

Interviewers are not testing whether you memorized definitions. They are testing whether you can take a single change, like a purchase of equipment or a write-down, and trace it through the income statement, cash flow statement, and balance sheet in order, with the balance sheet balancing at the end. That skill is a proxy for whether you can be trusted with a live model at 2am.

Expect layered follow-ups. A first-round question might be a straightforward depreciation walk-through. The follow-up changes one assumption, adds a second effect, or asks the same question one year later so accumulated effects come into play. Interviewers escalate until you break, so the goal is not to avoid hard questions but to stay structured when they arrive.

Speed and composure matter almost as much as correctness. A slow, hedged answer to an easy question signals that you learned the material yesterday. The bar is calm, ordered, complete answers delivered without notes.

The Three Statements and How They Link

You must be able to describe each statement in one or two sentences and then explain the links between them. The income statement shows revenue down to net income over a period, on an accrual basis. The cash flow statement starts from net income, adjusts for non-cash items and changes in working capital, then layers in investing and financing activities to arrive at the change in cash. The balance sheet is a snapshot: assets equal liabilities plus shareholders' equity.

The links are the whole game. Practice saying them as a clean sequence until it is reflexive.

• Net income from the income statement is the top line of the cash flow statement (indirect method) and flows into retained earnings on the balance sheet, net of dividends.
• Non-cash expenses on the income statement, like depreciation and amortization, are added back in cash flow from operations.
• Changes in operating balance sheet items (receivables, inventory, payables, deferred revenue) show up as working capital changes in cash flow from operations.
• The ending cash balance from the cash flow statement is the cash line on the balance sheet.
• Investing and financing activities on the cash flow statement drive PP&E, debt, and equity balances on the balance sheet.

Core Concepts You Must Know Cold

Beyond the linkages, a short list of concepts covers the large majority of accounting questions asked in IB interviews.

• Accrual vs cash accounting: revenue is recognized when earned, expenses when incurred, which is why net income and cash flow diverge.
• Depreciation and the tax shield: depreciation is non-cash, but it reduces pre-tax income and therefore reduces cash taxes paid.
• Working capital: increases in current operating assets consume cash; increases in current operating liabilities free up cash.
• Capitalizing vs expensing: capitalized costs hit the income statement over time through depreciation; expensed costs hit immediately.
• Deferred taxes: timing differences between book and tax accounting create deferred tax assets and liabilities.
• Goodwill and impairments: goodwill arises in acquisitions and is tested for impairment rather than amortized under US GAAP for public companies; write-downs are non-cash but reduce net income.
• Inventory methods: in an environment of rising costs, LIFO produces higher COGS and lower pre-tax income than FIFO; note that IFRS does not permit LIFO.
• Shareholders' equity: driven by net income, dividends, share issuance, and buybacks, and it can go negative (large buybacks or accumulated losses) without the company being insolvent.

The Classic Questions and How to Think About Them

The signature question is some version of: depreciation goes up by $10, walk me through the three statements. The framework matters more than the specific number. Always start on the income statement, apply the tax rate, move to the cash flow statement, then rebuild the balance sheet and confirm it balances. With a 40% tax rate, the classic teaching convention: pre-tax income falls by 10, taxes fall by 4, net income falls by 6. On the cash flow statement, net income is down 6, but you add back the 10 of non-cash depreciation, so cash is up 4. On the balance sheet, cash is up 4, net PP&E is down 10, so assets are down 6; retained earnings is down 6 on the other side, and it balances. If the interviewer gives you a different tax rate, use it, and if none is given, state your assumption out loud before computing.

A second family of questions changes what statement the item touches first. Buying equipment with cash touches only the cash flow statement and balance sheet at purchase; the income statement is affected in later periods through depreciation. Collecting a receivable moves value between balance sheet lines and shows up as a working capital source of cash, with no income statement impact. The discipline is always the same: identify whether there is an income statement effect, apply taxes only to items that are tax-deductible or taxable, then trace cash and balance sheet effects.

A third family is conceptual judgment. If you could only use one statement to assess a company's health, the standard answer is the cash flow statement, because cash generation is hardest to manipulate and ultimately pays the bills; a defensible alternative is that if you could only have one statement to build the others, the balance sheet plus two periods gives you the most reconstruction power. Explain your reasoning either way. The live bank questions below this guide give you plenty of these variants to practice against.

Common Mistakes

Most accounting answers fail in predictable ways. Knowing the failure modes in advance is half the fix.

• Forgetting taxes: any change that hits pre-tax income changes taxes, and the after-tax figure is what flows through.
• Getting working capital signs backwards: an increase in receivables is a use of cash, not a source.
• Starting on the wrong statement or jumping around: always income statement first when there is an income statement effect.
• Declaring that the balance sheet balances without proving it: walk both sides explicitly.
• Applying tax effects to items with no tax impact, or forgetting that some write-downs may not be tax-deductible (state your assumption).
• Reciting a memorized script that collapses the moment the interviewer changes one input.

How to Prepare: A Study Plan

Rereading a guide is not preparation. Accounting questions are performed under pressure, so your prep needs to simulate retrieval under pressure. Active recall beats passive review by a wide margin here.

This is exactly what WACC Buddy's accounting deck is built for: real bank-tagged questions, spaced repetition that resurfaces the ones you miss, and difficulty tiers so you graduate from single-change scenarios to multi-step chains.

1. 01Week 1: learn the three statements and their linkages until you can narrate them from memory in under a minute.
2. 02Week 1-2: drill single-change scenarios (depreciation, inventory write-down, deferred revenue, capex) out loud, always ending with the balance sheet check.
3. 03Week 2-3: escalate to multi-step and multi-period questions, and practice the same scenario at year 0 and year 1.
4. 04Ongoing: use spaced repetition daily for 15-20 minutes rather than cramming; say answers aloud, then check.
5. 05Final week: do timed mock rounds with a friend or on camera, and fix any question you cannot answer within 60-90 seconds.

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