EY Case Interview Examples: Worked Practice Case (2026)

Format

How EY Consulting cases work

EY Consulting covers business consulting, technology, and risk work, and it is closer to implementation than pure strategy firms. Its cases reflect that. Instead of asking whether a client should enter a market, an EY case is more likely to ask whether a new system is worth the investment and how to roll it out without disrupting the business.

There is no single EY format. Each team sets its own process, and candidates report a mix of prerecorded video interviews, live interviews, case interviews, and written cases. Ask your recruiter exactly what to expect.

Implementation is part of the answer

A good EY answer covers more than whether to act. It covers how: who is affected, what has to change in the process, and how to keep risk under control during the switch.

Cases are practical, not abstract

Expect process, cost, and technology questions grounded in how a real organization works, often in regulated industries like banking, insurance, healthcare, and the public sector.

Behavioral answers carry real weight

Many EY interviews lean as much on your experiences as on the case. Prepare your stories with the same care you give to case practice.

EY Consulting and EY-Parthenon recruit separately and interview differently. EY-Parthenon is EY's strategy arm, and its cases are closer to MBB in style and difficulty. If you are applying there, see the EY-Parthenon case interview examples instead.

Case types

Case types EY candidates report

These five themes cover most EY Consulting cases. Each example prompt below is an original EY-style prompt, not a real interview question. Pick a tab to see how you would structure it and what math to expect.

Example prompt: A hospital system wants to replace its scheduling software across 14 sites. Is it worth it, and how should it roll out?
How to structure it: Weigh benefits (staff time, fewer missed appointments, patient experience) against one-time and ongoing costs, then plan the rollout: pilot site, training, data migration, and how to run old and new systems side by side.
Math to expect: Hours saved times cost per hour, payback period, and adoption rates over time.

Practice case

Worked practice case: Lakeshore Mutual

This is an original case written in the style EY Consulting candidates describe: a technology investment, a process exhibit, a business case, and a rollout plan that has to work for the people using it. Interviewers differ on how much they guide you, so each step shows the question an interviewer would likely ask next.

Answer each step out loud or on paper before you reveal the model answer. The suggested times match a strong candidate's pace.

Technology and transformationInsuranceAbout 25 minutes

Lakeshore Mutual: is a new claims platform worth it?

Your client is Lakeshore Mutual, a US auto insurer that handles 400,000 claims a year. Claims take an average of 21 days to settle, customer satisfaction is falling, and handling costs keep rising. Lakeshore is considering a new claims platform that would process simple claims automatically. The platform costs $30 million up front plus $4 million a year in licensing. The COO has asked EY whether Lakeshore should invest, and how to make the rollout succeed.

If you ask clarifying questions, the interviewer shares:

Claims are handled by in-house adjusters at a fully loaded cost of $50 per hour.
Lakeshore tried a smaller system rollout three years ago, and adoption was poor.
Lakeshore is regulated at the state level and must be able to explain how each claim decision was made.

0 of 6 steps revealed

Structure the problem

Take about 2 minutes

Interviewer: How would you approach this decision?
I would answer two questions in order: is the investment worth it, and can Lakeshore make it work?
- Benefits: adjuster hours saved, faster settlement for customers, and fewer errors or overpayments.
- Costs: the $30M up front, $4M a year in licensing, plus integration, training, and running two systems during the switch.
- Making it work: people (adjuster buy-in and training), process (which claims go to automation), technology (integration and data quality), and compliance (explaining automated decisions to regulators).
Why it works: it puts implementation on equal footing with the business case. At EY, a positive business case is only half an answer, especially for a client whose last rollout failed.
Read the claims exhibit

Take about 3 minutes

Interviewer: Here is Lakeshore's claim mix. What share of total adjuster hours goes to simple claims, and what does that tell you?

Exhibit 1: Lakeshore claims by type

Claim type Share of claims Adjuster hours per claim

Simple (glass, minor damage) 60% 3

Moderate (larger repairs) 30% 8

Complex (injury, total loss) 10% 25

400,000 claims a year. Illustrative data for practice.

Share of hours on simple claims (%)
Build the business case

Take about 3 minutes

Interviewer: The vendor says the platform can fully automate 80% of simple claims. What are the net annual savings after licensing?

Net annual savings ($M)
Find the payback period

Take about 3 minutes

Interviewer: Savings will not arrive all at once. Assume Lakeshore captures half the gross savings in year one and all of them from year two, while paying full licensing from day one. How long until the $30M investment pays back?

Payback (years)
Plan the rollout

Take about 3 minutes

Interviewer: The last rollout failed because adjusters kept working the old way. How would you make this one stick?
- People: involve experienced adjusters in designing the workflows, train before go-live, and be clear early that freed-up capacity moves to complex claims rather than layoffs.
- Process: set clear rules for which claims route to automation, define how exceptions get escalated, and retire the old workflow so there is no way to fall back to it.
- Technology: start with one claim type in one region, test integration with policy and payment systems, and clean claims data before migration.
- Compliance and tracking: keep an audit trail for every automated decision, brief state regulators ahead of time, and track settlement time, automation rate, and payment errors weekly.
Tying each lever back to why the last rollout failed shows you listened to the clarifying information. That is a strong signal in any EY interview.
Make the recommendation

Take about 1 minute

Interviewer: The COO just walked in. What do you recommend?

Claim type	Share of claims	Adjuster hours per claim
Simple (glass, minor damage)	60%	3
Moderate (larger repairs)	30%	8
Complex (injury, total loss)	10%	25

Math

EY case math quick check

EY case math is mostly about time, cost, and adoption: how many hours a process takes, what an error costs, and how fast an investment pays back. Try these four without a calculator, and aim for under a minute each.

A finance team processes 120,000 invoices a year at 15 minutes each. How many staff hours is that?

Staff hours

A bank has 2 million customers, and 35% use its app. How many more users does it need to reach 50%?

Additional users (thousands)

4% of 500,000 transactions a year contain errors, and each costs $60 to fix. What is the annual cost?

Annual cost ($M)

A $6M system saves $1.5M a year but costs $0.3M a year to run. What is the payback period?

Payback (years)

Behavioral

The behavioral and video interviews

For many EY Consulting roles, behavioral questions make up a large share of the process, and some teams start with a prerecorded video interview before any live conversation. Prep guides describe EY looking for strengths like adaptability, curiosity, collaboration, learning agility, resilience, and relationship building, so build stories that show those clearly.

Prepare four to six stories that each show a different strength, with a clear result you can put a number on.
Practice on camera. Prerecorded interviews give you a short prep window and no follow-up, so your first answer has to be complete and well structured.
Have a specific "Why EY?" that names the team you applied to and the kind of work it does, not just the EY brand.

The EY interview guide covers the rounds in more detail.

Other formats

Written cases and presentations

Some EY teams use a written case instead of, or alongside, a live case. You typically get a pack of materials, time to review it and build a few slides, and then present your findings to a panel and take questions. One candidate interviewing for a technology risk role described exactly this format on a PrepLounge forum thread.

The common mistake is spending too long reading. Decide on your answer early, build one slide per key point with the takeaway as the title, and clearly label anything you assumed rather than found in the materials. The exhibit drills help with pulling insights from dense data quickly.

Prep plan

A two-week prep plan for an EY case

Days 1 to 3
Learn to structure business case and rollout questions. Start with the frameworks guide, and practice splitting implementation into people, process, technology, and risk.
Days 4 to 6
Drill math daily: hours times cost, payback periods, and adoption targets. Keep the numbers small by working per 100 units, then scale up.
Days 7 to 8
Work through exhibits, and give the single most important takeaway first every time.
Days 9 to 11
Run full cases with a partner, including at least two technology or operations cases. Redo Lakeshore Mutual from memory and time yourself.
Days 12 to 14
Prepare your behavioral stories and record yourself answering on video. If your team uses a written case, do one timed practice packet.

Keep preparing

EY interview guideRounds, formats, and what interviewers look for. EY-Parthenon case examplesA worked case for EY's strategy arm. EY salariesPay by level, compared with EY-Parthenon. EY application deadlinesDates and timeline for the next cycle.

FAQ

Frequently asked questions

Does EY Consulting use case interviews?

Many teams do, but not all. Each EY service line sets its own process, which can include prerecorded video interviews, live behavioral interviews, case interviews, and written cases. Your recruiter can confirm which you will get.

What kind of cases does EY give?

Mostly practical cases about technology, processes, cost, and risk, often in regulated industries. Expect to weigh a business case and then explain how you would make the change work.

Are EY cases candidate-led or interviewer-led?

It depends on the interviewer and team. Some guide you closely through a set of questions, while others expect you to drive. Practice both styles.

How is EY different from EY-Parthenon?

EY-Parthenon is EY's strategy arm. It recruits separately, focuses more on strategy and deal work, and runs harder cases that are closer to MBB in style. EY Consulting cases are more focused on implementation and operations.

Does EY use written cases?

Some teams do. You review a pack of materials, build a short presentation, and present it to a panel. Ask your recruiter whether your team uses one.

Is the Lakeshore Mutual case a real EY case?

No. It is an original practice case written to match the style EY Consulting candidates describe. All numbers are illustrative.

Sources

MyConsultingOffer, EY Case Interview Including EY Parthenon. myconsultingoffer.org. Accessed October 2026.
MConsultingPrep, EY Case Interview guide. mconsultingprep.com. Accessed October 2026.
PrepLounge, Written Case Assessment at EY (candidate forum thread). preplounge.com. Accessed October 2026.

Case Prep is an independent practice platform and is not affiliated with, authorized by, or endorsed by EY. The Lakeshore Mutual case, example prompts, and all data on this page are original teaching material.

EY Case Interview Examples: A Worked Practice Case