In a typical first round of eight Bain candidates, two or three clear the arithmetic and still fail the case. They land what Bain's own published cases call a good answer and stop. The offer goes to the person who adds the better layer: investment timeline, a next test, and a commercial constraint the math alone never surfaces.
That is the quiet thesis of Bain's practice material. The firm already published the scoring key. Most candidates treat the coffee shop and fashion cases as content to memorize. They are rubrics. After this piece you should be able to grade a Bain-style recommendation the way the sheet does, run one original diligence drill end to end, and know which skill to practice next instead of hunting for a tenth case PDF.
What Bain says it is testing
On its case interview preparation page, Bain describes a case as a structured conversation around a real business problem. The firm is explicit: it is not looking for a single right answer. It is watching how you think, structure, and build on ideas as the conversation moves. The interviewing overview repeats the same line for consulting cases: precision and creativity both count, and there is not necessarily a right answer.
That language is not courtesy. When I score cases, the sheet already has columns for structure, math, insight, and the close. Arithmetic is binary enough that weak math kills you early. The points that separate a pass from a strong pass almost always sit in the close: did you make a decision, attach a number, name a risk, and propose what you would test next?
Bain publishes two written practice cases for that reason: Coffee Shop Co. and FashionCo.. Both include a good answer and a better answer. Read those two pages before you open anyone else's case pack.
The good-versus-better gap, in one table
Bain's own answer keys make the scoring difference concrete. I have restated them as a grading table so you can apply the same lens to any practice case you run.
| Case | Good answer (passable) | Better answer (what the sheet rewards) | Where candidates stop early |
|---|---|---|---|
| Coffee Shop Co. | Year-one break-even is 204,675 cups (~3% of a 7M-cup market), so the idea is arithmetically feasible | Add payback horizon, site/competitive pressure, and go-to-market before calling it a yes | Declaring "3% is fine" and ending the case |
| FashionCo. | Intermittent sales (Option B) beat the rewards program (Option A) by about $50M on the given math | Flag Year-2 loyalty effects, re-test digital and style questions with data, treat Option A as a longer-horizon bet | Picking B from the spreadsheet and never revisiting the five-year decline |
Coffee Shop Co. gives price £3, variable cost £1, opening cost £245,610, and annual operating cost £163,740. Contribution is £2 per cup. Fixed costs in year one are £245,610 + £163,740 = £409,350. Break-even volume is £409,350 ÷ £2 = 204,675 cups. Against Bain's stated ~7,000,000-cup market, that is roughly 2.9 percent share, or about 561 cups per day if you divide by 365. Bain's good answer stops at "achievable share." The better answer asks how long it takes to recover the opening cost and whether differentiation survives a crowded Cambridge street.
FashionCo. is a revenue-option comparison on a flat 10 million customers spending $100 each. Bain's published good answer prefers intermittent sales because the arithmetic shows about $50M more than the rewards program under the stated assumptions. The better answer refuses to treat Year 1 revenue as the whole decision.
Ned's rule. If your recommendation could be spoken by someone who never saw the client's constraint set, you are still on the good answer. Name the decision, one number, one risk, and the next test. Four beats. Skip any of them and I mark the close incomplete.
One original diligence drill you can reproduce
Bain's client work skews hard toward private equity. On its private equity practice page, the firm states it works with about 80 percent of the world's largest PE firms and has supported more than 22,000 diligence projects and 6,500 portfolio projects. Its 2025 Global Private Equity Report notes that PE consulting is about one-third of Bain's global business. That mix shows up in interviews as acquisition and value-creation cases more often than at peer firms. Folklore on forums will invent specific "Bain PE case" scripts; treat those as folklore. The skill is portable: thesis, market, asset, returns bridge, deal-breakers.
Work this original case with a pen. Invented company, invented numbers. Cover the answer until you have a recommendation.
Prompt. A mid-market fund is considering a majority stake in HarborFit, a regional chain of 40 mid-price gyms. Current EBITDA is $28M. The seller wants 11.0x. The fund's underwriting needs a 2.5x money-on-money return in five years at a 9.0x exit. Management claims it can add eight sites and lift EBITDA margin from 22 percent to 26 percent of revenue. Current revenue is $127M. Should the fund bid?
Open with the decision. This is a go or no-go on entry price versus a returns bridge, not a tour of the fitness industry. Three branches matter: what EBITDA you exit on, what exit equity value that implies at 9.0x, and whether that clears 2.5x on the equity you put in today. Ignore membership marketing color until the bridge fails or clears.
Entry. Equity value at 11.0x on $28M EBITDA is $308M. Assume the deal is all-equity for the drill so the returns math stays visible (real deals add leverage; say that out loud so the interviewer hears you know the simplification).
Exit EBITDA. Revenue today $127M. Eight new sites: assume each new site does the current average, $127M ÷ 40 = $3.175M, so +$25.4M revenue if fully ramped, or about $152.4M. At a 26 percent margin, exit EBITDA ≈ 0.26 × $152.4M = $39.6M.
Exit equity value. 9.0x × $39.6M = $356.4M.
Money-on-money. $356.4M ÷ $308M ≈ 1.16x. That is nowhere near 2.5x.
Recommendation. Do not bid at 11.0x on this plan. At a 9.0x exit, even a clean margin lift and eight new sites only return about 1.2x unlevered. To clear 2.5x unlevered you would need exit equity of about $770M, which at 9.0x implies exit EBITDA near $86M—roughly triple today's earnings. The next test is a site-level ramp schedule and a costed margin bridge, not another turn of the marketing deck. Risk if you somehow proceed: new-site revenue is modeled at mature average from day one, which overstates Year-5 EBITDA.
That is a Bain-shaped close: decision, number, risk, next test. The arithmetic took six lines. The judgment is what the interviewer is still listening for after the calculator stops.
How to practice without bingeing case libraries
A stack of ten prompts with paragraph solutions trains recognition, not performance. Bain's process for consulting roles, per its interviewing page, is typically a digital assessment and then case interviews. London's Associate Consultant track, as of the 2026 London recruiting page, runs two interview rounds of cases after the online assessment. Your scarce resource is scored reps under time, not unread PDFs.
Use this sequence for two weeks:
- Work Coffee Shop Co. and FashionCo. cold from Bain's site. Grade yourself only against Bain's good and better answers.
- Run the HarborFit drill above once cold, once with the answer open, once explaining it aloud in under four minutes.
- Drill the skill that failed: structure, multi-step math, or synthesis. Full cases before the skill is fixed just reproduce the same miss.
- Only then add more full cases, and only if each one ends with a written four-beat recommendation you can grade.
| Skill that broke | Symptom in the room | Tightest next rep |
|---|---|---|
| Structure | Generic boxes, no mechanisms | Structure drill |
| Math | Lost units, stalled bridge | Math drill or quick math |
| Synthesis | Soft close, no next test | Synthesis drill |
| Market sizing opener | Assumptions undefended | Market-sizing drill |
The screen that can waste your case prep
In many offices the case never happens if the digital assessment fails. Bain's digital assessment FAQ states that when an assessment is required it is mandatory, takes roughly 30–40 minutes, and may be Sova or TestGorilla depending on office. Calculators are allowed on the digital assessment and not in later interviews. London points candidates to Sova numerical, logical, and personality samples. Soften any claim you hear about a single global format; Bain itself says requirements vary by role and office.
If your office uses Sova, practice the numerical and logical formats before you sink another weekend into cases. CoachNed's Bain SOVA simulator mirrors that screen. Case libraries do not.
Practice this week
One assignment, not ten. Open Coffee Shop Co., cover Bain's answers, and write your recommendation in four beats. Then uncover and mark yourself against good versus better. Repeat with FashionCo. the next day. On day three, run HarborFit cold and record yourself for four minutes. On day four, do a live case on CoachNed at /interview (CopperCup, about 18 minutes, seven-score debrief) or start with three typed turns at /start. Everything is open for seven days with no card; then $120 for a recruiting season or $49 a month.
For format, rounds, and behavioral prep beyond practice material, use the Bain case interview guide and Bain behavioral questions. CoachNed is not affiliated with Bain & Company.
Frequently asked questions
Where can I find official Bain practice cases?
Bain publishes Coffee Shop Co. and FashionCo. on its careers site, plus mock-interview videos linked from the case interview preparation hub. Start there before any third-party pack.
How many Bain practice cases should I do?
Enough to expose every skill on the sheet, not enough to memorize prompts. Two official cases graded on good versus better, one diligence drill, and daily skill drills beat a unread stack of ten. Add full cases only when you can write a four-beat close without looking.
Does Bain only ask private equity cases?
No. PE-shaped diligence is overrepresented relative to some peers because PE is a large share of Bain's work, but profitability, growth, and operations cases still appear. Prepare the diligence bridge; do not prepare only that archetype.
Is there a digital test before Bain case interviews?
Often yes. Bain's digital assessment page says consulting applicants may face Sova or TestGorilla depending on office, typically about 30–40 minutes, and that a missed deadline can end the application. Confirm what your invitation email names.
Are Bain cases candidate-led or interviewer-led?
Bain does not publish a single global script. Historically many Bain cases were conversational and candidate-driven; some offices and rounds now feel more guided. Practice both: drive when handed the floor, and answer the exact ask when the interviewer sequences questions. Do not treat forum certainty as firm policy.
Sources
- Preparing for the Case Interview | Bain & Company — official definition of the case interview and links to published practice cases. Checked 2026-09-24.
- Coffee Shop Co. | Bain & Company — published figures, break-even of 204,675 cups, good vs better recommendation. Checked 2026-09-24.
- FashionCo. | Bain & Company — published option math and better-answer guidance. Checked 2026-09-24.
- Interviewing | Bain & Company — consulting process outline (digital assessment then cases); no single right answer. Checked 2026-09-24.
- Digital assessment | Bain & Company — Sova vs TestGorilla, ~30–40 minutes, calculator rules. Checked 2026-09-24.
- Bain London Associate Consultant recruiting — 2026 London AC assessment and two-round case interviews. Checked 2026-09-24.
- Private Equity Consulting | Bain & Company — ~80% of largest PE firms; 22,000+ diligences; 6,500+ portfolio projects. Checked 2026-09-24.
- Global Private Equity Report 2025 | Bain & Company — PE consulting ~one-third of Bain's global business. Checked 2026-09-24.