Case study interviews are increasingly common in investment banking recruiting, particularly at elite boutiques, middle-market banks, and during Superday rounds at bulge brackets. Unlike standard technical questions that test your ability to recall formulas, a case study interview tests whether you can actually think like a banker — synthesizing information, structuring analysis, and presenting a defensible recommendation under time pressure. This guide covers everything you need to know to walk into your next case study with confidence.
What Is a Case Study Interview?
A case study interview presents you with a realistic business scenario and asks you to analyze it, make a decision, and defend your reasoning. Banks use case studies because they simulate the actual work of an investment banking analyst. Pitching a client on whether to pursue an acquisition, evaluating strategic alternatives for a company considering a sale, or assessing whether a leveraged buyout generates acceptable returns — these are the kinds of decisions junior bankers contribute to every day.
Case studies separate candidates who can apply concepts from those who have only memorized them. You might know how to calculate enterprise value, but can you use that knowledge to evaluate whether a deal makes sense? That is what the interviewer wants to find out.
The stakes are high. Case studies are typically given during final rounds and carry significant weight because they require sustained analytical thinking over 45 minutes to several hours, rather than the 2-3 minutes of a standard technical question.
Types of IB Case Studies
There are two primary formats you should prepare for, and they test different skills.
The first is the in-interview decision case. You receive a packet of materials — usually 5-15 pages including financial statements, industry data, and a brief description of the situation — and have 30-60 minutes to read the materials and present your recommendation. This happens in the interview room with the clock ticking. Banks like Evercore, Lazard, and Centerview are known for using this format.
The second is the take-home modeling test. You receive a company profile, historical financials, and sometimes an information memorandum. You typically have 3-5 hours (sometimes up to a full weekend) to build a financial model, perform analysis, and write a short memo summarizing your conclusions. Goldman Sachs, Moelis, and many middle-market firms use this format, often as a screening step before or after Superday.
Some banks combine both: a take-home model followed by an in-person presentation where you walk through your work and defend your assumptions.
The In-Interview Decision Case
The in-interview case rewards structured thinking over raw speed. Here is a framework that works consistently.
First, spend the initial 5-7 minutes reading through all the materials. Do not start analyzing immediately. Identify the key question being asked: Should the company sell? Should they acquire this target? Is this the right time for an IPO? Understanding exactly what decision you need to make will focus your analysis.
Second, identify the 3-4 most important factors that will drive the decision. For an acquisition, these might be strategic rationale, valuation, financing feasibility, and integration risk. For a sale process, consider market timing, valuation expectations, competitive dynamics among buyers, and management preferences.
Third, analyze each factor using the data provided. Pull specific numbers from the materials. Calculate key metrics: revenue growth rates, margin trends, implied multiples, debt capacity. Do not try to build a complete model — you do not have time. Focus on back-of-the-envelope math that supports your argument.
Fourth, form a clear recommendation and structure a 3-5 minute presentation. Lead with your conclusion: "I would recommend the company pursue a sale process, and here is why." Then walk through your supporting analysis point by point. Acknowledge the risks and explain why you still favor your recommendation despite them.
Interviewers want to see conviction backed by logic. They are not looking for the "right" answer — reasonable people can disagree on deal decisions. They are evaluating your analytical process and your ability to communicate under pressure.
The Take-Home Modeling Test
The take-home test gives you more time but expects a more polished deliverable. Banks are evaluating both your technical modeling ability and your judgment.
Start by reading all provided materials thoroughly before opening Excel. Understand the company's business model, revenue drivers, cost structure, and capital needs. Identify the key assumptions that will have the greatest impact on your output.
Build your model with clean formatting. Use consistent color coding: blue for inputs, black for formulas, green for links to other sheets. Label every assumption clearly. Structure your model so someone else can follow your logic without explanation. Sloppy formatting is an immediate red flag — analysts spend hours formatting models in live deal work, and banks want to see that discipline from the start.
For a standard modeling test, your model should typically include a revenue build (bottoms-up or top-down depending on available data), an income statement projection with explicit margin assumptions, a working capital schedule, a capex forecast, a free cash flow calculation, and a DCF or LBO analysis depending on the scenario.
Perform sensitivity analysis on your 2-3 most important assumptions. This demonstrates you understand that models are tools for exploring scenarios, not machines that produce a single definitive answer.
Write a concise memo (1-2 pages) summarizing your conclusions. State your recommendation clearly. Highlight the key drivers of value. Note the primary risks. If you were asked to evaluate an acquisition, include a clear statement on whether you recommend proceeding and at what price range.
Common Case Study Scenarios
Several scenarios appear repeatedly across banks.
The sell-side advisory case asks whether a company should pursue a sale, and if so, what process and valuation expectations are appropriate. You will need to assess the company's standalone value, identify likely buyer types (strategic vs. financial), evaluate market timing, and consider management and shareholder objectives.
The buy-side acquisition case asks whether a client should acquire a specific target. Focus on strategic rationale (why this target, why now), valuation (is the price reasonable relative to comparable transactions), synergies (revenue and cost, and how realistic they are), financing (cash, stock, or debt, and impact on credit metrics), and accretion/dilution to earnings.
The IPO readiness case asks whether a company is ready to go public. Consider the company's financial profile relative to comparable public companies, growth trajectory, market conditions, corporate governance readiness, and the use of proceeds.
The restructuring case asks how to address a company in financial distress. Evaluate the capital structure, identify unsustainable debt levels, assess operational turnaround potential, and consider options ranging from out-of-court restructuring to Chapter 11.
The LBO case asks whether a private equity firm should acquire a target at a given price. Build a simple LBO model, assess entry multiple, debt capacity, operational improvement opportunities, and projected returns over a 5-year hold period.
Worked Example: Sell-Side Advisory
Imagine you receive materials on a specialty chemicals company with $500M in revenue, 18% EBITDA margins, growing at 6% annually. The founder holds 60% of equity and is considering retirement. The company has $50M in debt and $30M in cash. Comparable public companies trade at 10-12x EBITDA. Recent transactions in the sector closed at 11-14x EBITDA.
Here is how to structure your analysis. First, calculate EBITDA: $500M x 18% = $90M. The implied enterprise value range using public comparables is $900M-$1.08B, while precedent transactions suggest $990M-$1.26B. The premium in transactions over trading multiples reflects the control premium that buyers typically pay.
Second, assess buyer interest. Strategic acquirers in specialty chemicals (e.g., BASF, Dow, Evonik) would likely pay the highest price due to distribution synergies and product overlap. Financial sponsors would also be interested given stable margins, low cyclicality, and clear growth profile, but would likely offer lower multiples.
Third, evaluate timing. The sector is currently seeing elevated M&A activity, and interest rates are at a level where financing is available. The founder's retirement plans create a natural catalyst.
Your recommendation: Proceed with a broad sale process targeting both strategic and financial buyers. Set initial valuation expectations at 12-13x EBITDA ($1.08B-$1.17B enterprise value). The company's consistent growth, healthy margins, and founder succession catalyst make it well-positioned for a competitive process.
Worked Example: Acquisition Evaluation
Now consider the other side: you are advising a large industrial company ($5B revenue, $800M EBITDA) evaluating the acquisition of a smaller competitor ($400M revenue, $80M EBITDA) at an asking price of 12x EBITDA ($960M enterprise value).
Start with strategic rationale. The target operates in an adjacent product category that your client has been trying to enter organically. The acquisition would add 8% to revenue and provide access to 3 new end markets. The target has strong customer relationships in the Midwest region where your client has limited presence.
Next, evaluate synergies. Cost synergies could include consolidating 2 of the target's 5 manufacturing plants (estimated $15-20M annual savings), procurement savings from combined purchasing power ($5-8M), and corporate overhead elimination ($8-10M). Total estimated cost synergies: $28-38M, or 35-48% of the target's EBITDA. Revenue synergies from cross-selling into each other's customer base are possible but harder to quantify — assume conservatively at $10-15M.
Then, check accretion/dilution. At 12x pre-synergy EBITDA, the deal looks expensive on paper. But with $30M of run-rate synergies (midpoint), the effective multiple drops to approximately 8.7x ($960M / ($80M + $30M)). If your client trades at 10x EBITDA and finances with 50% debt at 5.5% interest and 50% cash, the deal would be roughly neutral to mildly accretive to EPS in Year 1 and accretive by 8-12% by Year 2 as synergies phase in.
Finally, assess risks. Integration of manufacturing operations carries execution risk. The target's management team may not stay post-close. Customer concentration — if the target's top 5 customers represent 40%+ of revenue — poses retention risk.
Your recommendation: Proceed with the acquisition but negotiate the price down to 10-11x EBITDA ($800M-$880M). At that range, the deal is immediately accretive and provides a margin of safety even if synergies disappoint. Structure the deal with an earnout component tied to customer retention to mitigate concentration risk.
How to Practice
Effective case study practice requires a different approach than studying for standard technical questions.
First, read real deal announcements and press releases. When you see a headline like "Company X to Acquire Company Y for $2B," pull up the proxy statement or investor presentation and try to reconstruct the analysis. What was the strategic rationale? What multiple did they pay? How did they finance it? This builds the pattern recognition that makes you faster in actual case studies.
Second, build simple models from scratch. Download 10-K filings for mid-cap companies and practice projecting revenue, EBITDA, and free cash flow. Time yourself. A good analyst can build a basic 3-statement model in 2-3 hours. You want to get your modeling speed to that level before your interview.
Third, practice presenting your analysis. Set a timer for 5 minutes and present your recommendation to a friend, a mirror, or a recording device. Practice leading with the conclusion, supporting with data, and addressing counterarguments. This presentation skill is what separates candidates in case study interviews.
Fourth, use reputable case study prep resources. Many investment banking prep services offer practice case studies with model answers. Work through 3-5 full case studies before your interview. The first one will feel clumsy. By the third, you will have developed a rhythm.
Fifth, practice under realistic time pressure. For in-interview cases, give yourself 45 minutes with a printed packet and no internet access. For take-home tests, set a strict 4-hour window and treat it like the real thing.
Mistakes That Kill Your Chances
Certain mistakes are disproportionately costly in case study interviews because they signal a fundamental gap in how you approach analytical work.
Jumping to a conclusion without structured analysis is the most common mistake. Candidates who skim the materials and immediately say "they should sell" without walking through the key factors will get pushed back hard by interviewers. Always show your work.
Ignoring downside risks makes you look naive. Every deal has risks. If you present a recommendation without acknowledging what could go wrong, the interviewer will conclude you lack judgment. The best answers explicitly address the 2-3 biggest risks and explain why the recommendation stands despite them.
Sloppy math destroys credibility instantly. If you say EBITDA is $90M but your math shows $500M x 18% = $80M, the interviewer will question every number in your analysis. Double-check your arithmetic, especially under time pressure.
Poor presentation structure wastes your limited time and frustrates interviewers. Do not present your analysis in the order you did it. Instead, lead with the conclusion, then walk through the supporting pillars in order of importance. End with risks and mitigants.
Overcomplicating the analysis is a trap that strong technical candidates fall into. You do not need to build a full 3-statement model in a 45-minute in-interview case. Back-of-the-envelope calculations that clearly support your thesis are far more effective than a half-finished spreadsheet.
Finally, being unable to defend your assumptions shows you built your analysis on shaky ground. If you assume 8% revenue growth, be ready to explain why. "The company grew at 6% historically, and the new product launch in Q3 should add 2 percentage points" is a defensible answer. "It just seemed reasonable" is not.
Frequently Asked Questions
**How long should I spend preparing for case study interviews?** Most candidates need 20-30 hours of dedicated case study practice on top of their standard technical preparation. Start at least 3-4 weeks before your interview.
**Do all banks use case studies?** No. Case studies are most common at elite boutiques (Evercore, Lazard, Centerview, PJT, Moelis) and during final rounds at bulge brackets. Some middle-market firms also use them. Ask your contacts at the bank about the interview format.
**What if I get the answer "wrong"?** There is rarely a single right answer in case study interviews. Interviewers evaluate your analytical process, your use of data, and your ability to present a clear recommendation. Two candidates can recommend opposite actions and both receive offers if their analysis is rigorous.
**Should I bring a calculator?** For in-interview cases, ask if one will be provided. Usually you will get a basic calculator. For take-home tests, you will use Excel. In either case, practice mental math for quick sanity checks.
**How important is industry knowledge?** It helps but is not required. Banks expect you to learn industry specifics on the job. What matters is your analytical framework and your ability to work with whatever information is provided in the case materials.
