400 IB Questions vs Real Prep: Investment Banking Interview Guide

Somewhere between first year and the superday invite, almost every candidate downloads the same 400 IB questions PDF. It feels like insurance. It is actually the reason so many candidates sound identical the moment an interviewer asks a follow-up that is not on the list. Interviewers have caught on. 2026 rounds increasingly reward candidates who can reason from first principles over candidates who can recite.

This guide is the hub for investment banking interview prep on Finbound: what the process looks like stage by stage, how technicals and behaviourals connect, and how to sequence four to six weeks of prep against wherever you currently are. Company guides handle the motivation angle. This one handles the substance.

Why the 400 IB questions PDF fails as a script

The list is still useful as a theme checklist. Accounting, valuation, M&A, and fit all appear. The failure mode is treating every prompt as a line to memorise.

Interviewers who have heard the same three-statement walkthrough fifty times will twist one variable. They ask what changes if the asset is debt-financed. They ask what breaks if depreciation is not the only move. Scripted candidates freeze. First-principles candidates keep talking.

Use the PDF to build a study map. Then practise out loud with interruptions. Pair it with our investment banking interview technical questions guide for depth, not another identical flashcard deck.

How the interview process is actually structured

Most programmes still follow a recognisable funnel, even when banks rename the stages. After the CV screen and online tests (numerical, verbal, or situational judgement, covered in our psychometric test guide), you typically hit a HireVue or video round of three to six recorded questions, heavy on fit and commercial awareness with light technicals mixed in.

From there, many banks add a live technical or first-round call, often with an analyst or associate rather than a senior banker. Our phone interview guide covers what that screen is really checking for. A second round, where it exists, pushes deeper follow-ups and starts cross-checking consistency against what you said earlier. Our second round interview guide walks through that stage. The final gate is a superday or assessment centre: several back-to-back interviews, sometimes with group exercises, case studies, or retests layered in.

UK candidates who have read US-focused forums hit a naming trap. What Americans call a superday is often branded an assessment centre in London. It is usually broader than a day of thirty-minute chats. Expect group tasks, individual case studies, and e-tray inbox simulations, with interviewers comparing notes on whether your story holds together. Our superday investment banking guide covers interview-heavy final rounds. Our assessment centre tips guide covers the group and case-study format. The e-tray exercise guide covers prioritisation separately.

Treat every stage as decisive. Internal calibration meetings are unforgiving. One weak interview inside an otherwise strong day can still sink the outcome.

Technicals: why they connect instead of sitting in separate boxes

The mistake most self-study makes is treating technicals as a stack of unrelated flashcards. In a good interview they talk to each other. A DCF assumption leans on an accounting fact. A merger question leans on a valuation call.

Accounting and three-statement linkage is still the single most common filter. The bar is walking a change through all three statements without pausing to think.

Take the classic prompt, "walk me through a $10 depreciation increase." On the income statement, depreciation expense rises, operating income falls, and net income falls after tax. On the cash flow statement, net income is down but depreciation is added back, so cash from operations often ends up roughly neutral if that is the only change. On the balance sheet, PP&E falls and retained earnings falls, so assets and equity still tie.

Interviewers then twist the scenario. What if the asset is financed with debt? What if inventory writes up? The real test is whether you can reason forward when one variable changes. If you need definitions while you practise, use the finance glossary alongside tracing the linkages yourself.

Valuation questions ask you to explain, not recite: which cash flows you discount, why WACC matters, what drives terminal value, and when a DCF misleads you. Trading comps reflect current sentiment when true peers exist. Precedent transactions carry a control premium and suit M&A contexts better.

Our valuation interview questions guide covers comps, precedents, and the EV-to-equity bridge. Strong candidates pick the right tool and sanity-check out loud. "That implied multiple feels high because…" is a sentence interviewers want to hear.

M&A and markets questions often start conceptual before they get quantitative: accretion or dilution intuition, why synergies matter, why a strategic buyer sometimes pays more than a financial sponsor. Our investment banking technical interview questions guide covers accounting, valuation, and M&A prompts when interviewers interrupt mid-answer.

Our accretion dilution guide covers EPS accretion on its own. When interviewers push into sponsor maths, the paper LBO interview guide covers the mental-model approach. HireVue sometimes asks definition-level technicals. Superday technicals more often ask you to apply a concept to a mini case.

Behaviourals: not filler, and not a script either

Behavioural questions decide offers when technicals are table stakes, which by superday they usually are. Use STAR (situation, task, action, result) as scaffolding rather than a script. Build four to six stories that flex across leadership, failure, conflict, why banking, and ambiguity under a deadline.

The UK-specific pressure test is the airport test: would an interviewer want to be stuck at an airport with you at eleven at night? Calibration is social as much as technical. Arrogance or Wikipedia recitation loses the room faster than a missed tax shield.

Our airport test finance interview guide covers that fit dimension. Our behavioural questions guide has STAR frameworks across teamwork, failure, leadership, and conflict. Prepare a thirty-second and a two-minute version of each story. HireVue rewards brevity. A superday partner may deliberately push for detail.

HireVue and superday, back to back

HireVue is an async filter, not the final exam. Expect three to six questions, roughly one to three minutes of prep per answer, and sometimes one optional retake, though not every bank allows it. Question types mix fit, market awareness ("tell me about a recent deal"), light technicals, situational judgement, and the occasional brainteaser.

Look at the camera rather than your notes. Glancing down reads as evasive. Answer the question first and add context after. Bankers watching are time-poor even on video. Keep two deal talking points you genuinely understand, covering rationale, valuation angle, and sector read-through. Our walk me through a deal guide structures full walkthroughs. Record yourself before the real thing. Most candidates dislike how they sound, and that discomfort is worth having before a bank sees it, not after.

For commercial awareness specifically, structure your answer as what happened, why it matters, then the second-order effect on a sector or deal type. Our commercial awareness guide covers that framework without slipping into headline recitation. For a full playbook on camera and pacing, see our HireVue finance interview tips guide.

Superday and assessment centre rounds are harder because interviewers probe the edges of your HireVue answers. They also check consistency across five or six conversations in one day.

Expect "why banking" repeated on purpose so answers can be compared. Applied technicals often arrive as a live scenario ("a client is acquiring X, how would you think about value?"). Division-specific depth separates M&A from markets from ECM. In group tasks, collaboration beats domination. Assessors watch whether you listen as much as whether you talk.

Memorising a 400 IB questions guide verbatim falls apart the moment a follow-up breaks the script. A different "why banking" story each round gets caught at calibration. Ignoring the quiet person in a group task gets scored against you. Cramming technicals only after the invite arrives leaves you short on stamina. Run at least one complete mock: four to six sessions back to back, before the real one.

Sequencing your prep against where you actually are

Generic prep fails because HireVue and superday need different work. Tie revision to where each live application sits rather than running one fixed syllabus.

A realistic four-week baseline, longer if you have it: week one is accounting linkages daily plus drafting six STAR stories. Week two is valuation and M&A concepts plus recording two HireVue-style answers a day. Week three is applied cases and mental maths plus reading deal news with second-order notes. Week four is a full mock superday, fixing whichever stories felt weakest, and bank-specific "why us" research.

Finbound is built around exactly this idea. Track your applications, then study company-, division-, and stage-specific tasks instead of one generic guide. If you want prep structured around your actual applications rather than a static PDF, start for free and add the banks you are genuinely interviewing with.

Investment banking interview questions reward clarity under pressure, not encyclopaedic memory. Learn the frameworks, practise out loud, and align your prep with the stage you are actually in, not the stage you hope to reach in three weeks.

What to do after reading this

Prepping against a 400 IB questions PDF, or mapping technicals and behaviourals across HireVue and superday? Use the list as a theme checklist, then practise interrupted answers out loud by stage.

Next reads: IB technicals, HireVue tips, and behavioural questions. If you are choosing between divisions, read equity research vs investment banking before you over-index on M&A technicals alone.