The Three Questions That Decide Most First-Round IB Interviews

Walk me through your resume. Why investment banking. Walk me through a DCF.

These aren't trick questions. They're the floor. If you can't clear them cleanly, no one cares whether you can do an LBO in your head or quote the latest M&A premiums. The banker on the other end of the call stops paying attention somewhere around minute eight and you're out before you ever get to the part of the interview you actually prepared for.

This piece breaks down what each question is really testing, where candidates fail, and what a clean answer looks like.

Why These Three

First-rounds are typically thirty minutes, sometimes twenty-five. The banker running the screen has six more interviews on their calendar and another four hours of live deal work after that. They are not trying to discover hidden genius. They are trying to eliminate people who can't handle the basics, fast, so they can spend their attention on the candidates who survive the floor.

The three questions are the floor because they cover the three things every banker needs to verify before they'll spend mental energy on you. Can you tell a coherent story about yourself under mild pressure (resume). Do you actually want this job for reasons that survive ten seconds of follow-up (why IB). Do you understand, mechanically, how a company gets valued (DCF).

Everything else — LBO mechanics, accretion/dilution, market questions, behavioral curveballs — is bonus. It's how interviewers differentiate among candidates who've cleared the floor. If you stumble on the floor, the bonus round doesn't matter, because the interview has already ended in the banker's head.

The frustrating part: candidates spend weeks on the bonus material and walk in unprepared for the three questions that actually decide the outcome. They can explain a paid-in-kind toggle but they fumble their own resume walk. The misallocation is almost universal and it's why these three questions still work as a filter.

Question 1: Walk Me Through Your Resume

The structure is roughly ninety seconds, chronological, with a single thread running through it. Each move you've made should answer the question "why did you make this choice" and connect to the next move. Done right, the walkthrough sounds like a person explaining their thinking. Done wrong, it sounds like someone reading bullet points back to a recruiter.

The most common failure mode is exactly that: reading the resume. Dates, titles, bullet points. "I worked at Acme Corp from June to August where I built financial models and supported senior bankers on three M&A transactions." This is resume language. It is not human language. The interviewer already has the resume in front of them. If you're going to spend ninety seconds saying things they could read in fifteen, they will tune out and you'll never get the rapport that turns a screen into an offer.

The fix is what I'll call the "so I" rule. Every transition between experiences should sound like: "I did X, I learned Y, so I wanted to do Z." Not "then I worked at." Not "after that." The phrase "so I" forces causality. It forces you to actually have a reason for each move rather than just a chronological list of resume entries.

A clean version sounds something like this. I came in as a chem major because I'd done research in high school and assumed I'd go to med school. Sophomore year I took a corporate finance elective that turned into the most engaging class I had, so I switched to a finance concentration and joined the student investment club to get hands-on with stock pitches. The club work made me want real deal exposure, so I took an internship at a regional valuation firm last summer where I worked on fairness opinions for two middle-market M&A deals. That experience showed me the most interesting part of the process was happening on the banking side, not the valuation side, which is why I'm in this seat today.

That's roughly seventy-five seconds, four experiences, with a thread. Notice the ending. Don't trail off. Don't say "and yeah, that's me." Land the walkthrough by pointing at the interview itself. "Which is why I applied here." "Which is why I'm talking to you today." It signals confidence and it cues the interviewer to move on rather than leaving an awkward silence.

A few other failure modes worth flagging. Don't start in high school. No one cares about your varsity tennis ranking or your debate team officer position unless you sold a company while you were doing them. Start at college unless there's a specific high school experience that genuinely set the trajectory.

Weight your experiences by relevance. A six-week valuation internship gets more airtime than the eight-month teaching assistant gig, even if the TA role is longer on the resume. The interviewer doesn't want a proportional summary, they want emphasis on what made you a candidate for this job.

Finally, kill the humble-brag cadence. "I built models, I ran processes, I supported senior bankers." Every candidate uses these phrases, and they communicate nothing. Replace them with specifics. Not "I built models" but "I built the operating model for a $400M industrials deal that priced two weeks after I left." Specifics make you memorable. Generic banker-speak makes you forgettable.

Question 2: Why Investment Banking

This is the hardest of the three. The honest answer (money, exit opps, prestige) is the wrong answer to say out loud. The polished answer, "I want to learn, I love finance, I want to be challenged," is too generic to land. Every candidate gives the polished answer. The interviewer has heard it forty times this month and it tells them nothing about you.

The framework that works is to anchor on something specific you've actually done that maps to what bankers actually do.

Not "I love finance" but: "In my PE internship I sat in on three diligence calls and what I noticed was that the bankers on the sell-side had structured the entire process: the CIM, the management presentations, the timeline, the bidder communications. The deal flow was being driven from their seat, not ours. I wanted to be on that side of the table."

That answer works because it does three things at once. It demonstrates you've actually been around the work. It shows you can articulate what bankers do at a level deeper than "they advise on deals." And it gives a specific reason rooted in your own experience rather than a generic claim about your interests.

The test for whether your answer is strong enough: imagine the interviewer hitting you with a follow-up. "Why not consulting." "Why not corporate development." "Why not go to the buy-side directly." If your answer already contains the implicit differentiator — what banking offers that the alternatives don't — you're fine. If you have to invent the differentiator on the spot, you didn't prepare properly and your answer was too generic.

Three honest reasons that survive pushback, in case you need a starting point.

First, execution speed and depth of deal exposure at the analyst level. A first-year banker will touch more live transactions in twelve months than a corporate development associate will see in three years. That volume is what builds the pattern recognition for everything that comes later. Junior consultants get strategy work but rarely sit through a full deal cycle from pitch to close.

Second, the technical foundation. Banking is the only seat where you're forced to model, value, and structure deals from scratch under pressure, for clients who will call you out if the numbers don't tie. That foundation is what makes ex-bankers competitive for buy-side seats, corporate strategy roles, and operating jobs at companies they want to build.

Third — and this is where you make it specific to the bank — the products, sectors, or groups at this firm you've researched and can name. If you're interviewing with a coverage group, know two recent deals they did and have a view on why they made sense. If you're interviewing with a product group, know what differentiates their pitch from the competing bulge brackets. This is the part candidates skip because it requires actual research, which is exactly why doing it stands out.

What to avoid. "Fast-paced environment." "Great people." "Steep learning curve." "I want to be challenged." These phrases are dead. The interviewer's brain registers them as filler and stops processing the rest of the sentence. If you find yourself reaching for one of them in your answer, replace it with a specific example or cut it entirely.

Question 3: Walk Me Through a DCF

The technical floor. If you can't do this cleanly in ninety seconds, the interview is over even if no one tells you. The walkthrough doesn't have to be exhaustive. First-round bankers don't expect you to recite every adjustment. It has to be structured, mechanically correct, and delivered without the hesitation that signals you've memorized steps without understanding them.

The clean five-step structure:

1. Project unlevered free cash flow for 5–10 years (explicit forecast period)
2. Discount each year's UFCF back to today at WACC
3. Calculate terminal value at end of forecast period (Gordon Growth or exit multiple)
4. Discount terminal value back to today at WACC
5. Sum to get enterprise value, then bridge to equity value (subtract net debt, add cash, adjust for minorities and preferred)

That's the skeleton. Ninety seconds, delivered cleanly, signals you understand the model. Most candidates can recite something close to this. The differentiator is the next layer: explaining the why underneath each step.

The most important "why" — and the one most candidates skip — is why the cash flows are unlevered. Because WACC already incorporates the cost of debt, so if you used levered cash flows you'd be double-counting the debt benefit. Saying this proactively, in one sentence, separates "memorized the steps from a guide" from "actually understands the model." It's the single highest-leverage thing you can add to a DCF walkthrough.
Where interviewers push.

Terminal growth rate. Do not say 5%. Do not say "I'd use whatever the historical growth rate is." Pick something at or below long-run GDP growth (2 to 3% for developed markets) and be ready to defend the choice. The argument: a company cannot grow faster than the economy forever, because if it did, it would eventually become the economy. Bankers test this because candidates who haven't thought it through will pick numbers that imply nonsense in perpetuity.

WACC components. Be ready to walk through the cost of equity using CAPM — risk-free rate, equity risk premium, beta — and the after-tax cost of debt. Weight by market value of equity and debt, not book value, and be ready to say why (market values reflect current cost of capital; book values reflect historical accounting). For private companies, you can mention you'd lever and unlever beta from comparable public peers. You don't need to derive every component in ninety seconds, but you need to be able to do it if asked.

Sensitivity. Terminal value typically represents 60 to 80% of total enterprise value in a standard five-year DCF, which means the answer is most sensitive to WACC and terminal growth rate. Say this proactively before they ask. It signals that you understand which assumptions actually move the output, which is a level of practical understanding that almost no first-rounder volunteers.
The ninety-second version doesn't include every nuance. It includes the skeleton, clean, with one or two layers of why embedded in it, and the implicit signal that you could go deeper on any step if pressed. That's enough. Don't try to cram in every adjustment you've memorized. Bankers who want depth will ask for it. Your job in the walkthrough is to demonstrate you have the structure, not to perform a recital.

What Happens If You Clear All Three

The interview opens up.

The technicals get harder, the behavioral gets weirder, and the banker starts actually engaging rather than running through a checklist. They might ask you about a recent deal in the sector, push you on a market question, or hand you a curveball to see how you think on your feet. This is the part of the interview where actual differentiation happens — where strong candidates become offers and decent candidates become second-rounds.

But you only get to that part of the interview if you clear the floor first. Candidates who fumble the resume walk or hesitate on the DCF never see the differentiating questions, because the banker has already mentally moved them into the "no" pile and is just running out the clock. The cruel part is that you usually can't tell from inside the interview. The banker stays polite, asks the remaining questions on their list, and tells you they'll be in touch.

That's why the three questions are worth disproportionate prep time. They're not the most interesting questions in your prep stack. They're the gatekeepers.

Where to Drill

The Intern-level interviewer on HARDO is built around these three questions (the walkthrough, the why-banking, and the DCF) with follow-ups that escalate when the answers go vague. One free Intern interview, no card. If the goal is reps on the floor questions before recruiting starts, that's the cheapest place to get them.