In a typical first-round slate of eight Big 4 consulting candidates, two or three will answer as if every logo on the wall buys the same case. They quote Deloitte's network revenue while interviewing for a PwC Advisory associate role, then close a cost-cut case the way a Monitor deck would. The interviewer is not scoring brand affinity. The sheet is scoring fit to the entity on the invite.
The thesis most guides never say plainly: Deloitte, PwC, EY, and KPMG are not four consulting firms. They are four professional-services networks. Each sells audit, tax, and a large advisory or consulting business, and three of them also recruit into a named strategy brand that is a different interview and a different staffing model. Mix those, and you prepare for the wrong close, the wrong behavioral story, and the wrong pay band.
After this piece you should be able to name which door your letter opens, what that door scores in the room, and which practice rep to run this week.
What the headline numbers actually measure
Candidates love ranking the Big 4 by "size." Size of what? Aggregate network revenue includes audit partners, tax compliance teams, and managed-services contracts you will never staff on as a first-year consultant.
As of the firms' FY2025 announcements:
| Network | FY2025 aggregate revenue | People (reported) | Fiscal year end | What the figure includes |
|---|---|---|---|---|
| Deloitte | US$70.5 billion | Over 470,000 | 31 May 2025 | Whole network; consulting split into Strategy, Risk & Transactions and Technology & Transformation |
| PwC | US$56.9 billion | About 364,000 | 30 June 2025 | Whole network; Advisory alone was US$24.3 billion |
| EY | US$53.2 billion | About 406,000 | 30 June 2025 | Whole network; Consulting US$16.4 billion; Strategy and Transactions US$6.2 billion |
| KPMG | US$39.8 billion (continued ops) | Not restated here | 30 September 2025 | Whole network; Advisory grew 2.9% on that base |
Those are durable, firm-published figures. They are not consulting headcount, and they are not a quality ranking of case interviews. Deloitte publishes SR&T and T&T growth rates rather than a single consulting dollar line; PwC publishes Advisory as a line; EY splits Consulting from Strategy and Transactions (the EY-Parthenon brand sits in that second pot); KPMG reports Advisory growth inside a smaller overall network. If someone tells you "Deloitte consulting is US$70 billion," they have confused the network with the practice.
Eight doors, not four logos
Write the invite letter on a napkin before you open a case book.
| Network | Core consulting / advisory door | Strategy-brand door |
|---|---|---|
| Deloitte | Consulting (SR&T / T&T and related campus routes) | Monitor Deloitte strategy track |
| PwC | Advisory / Consulting | Strategy& |
| EY | Consulting | EY-Parthenon (Strategy and Transactions) |
| KPMG | Advisory | KPMG Strategy (service line inside Advisory, not a separate MBB-style brand in most markets) |
The first column is where most volume lives: transformation, technology, risk, operations, and industry programs that run for months. The second column is where the case looks closer to classic strategy — market entry, portfolio choice, commercial diligence — and where pay and prestige folklore cluster. Strategy& is explicit that it is PwC's global strategy business with its own career track. EY-Parthenon markets strategy, deals, and corporate finance as a distinct career surface. Monitor sits inside Deloitte's strategy offering. KPMG publishes Strategy as a capability; in most recruiting markets you are still hired into Advisory, not into a standalone boutique letterhead.
If your prep sheet says "Big 4 case" without naming the column, you are practicing a firm that does not exist.
What the interviewer is listening for
Core consulting interviews at these networks are not McKinsey PEI-plus-script, and they are not BCG candidate-led generalist strategy by default. Patterns that show up often enough to plan around:
Online screens cut the funnel before a partner ever hears you. On many US early-career routes, PwC requires an assessment before the application is complete. EY's Early Careers skills assessment is mandatory for applicable roles, usually takes 45 to 60 minutes, and asks you to finish within 48 hours of the invite. Fail the screen and the case never happens.
Deloitte's published case method scores the close. Deloitte US walks candidates through a five-step approach that ends with recommendations and next steps with expected impact. I stop listening when a candidate gives a tidy "cut 8%" without naming who owns the pilot, what gets measured in 90 days, and what breaks if the pilot works. That next-step line is not decoration; it is on the sheet.
Strategy-brand rooms punish "I applied to every logo" stories. When the letter says Strategy&, Parthenon, or Monitor, the behavioral half is often as decisive as the case. You need three reasons that only make sense for that entity — deals exposure, strategy-plus-implementation staffing, or a specific industry slate — not "I want consulting."
Core Advisory rooms punish strategy theater. A 40-minute PwC Advisory or EY Consulting case that asks how to stand up a shared-services center does not want a five-box industry structure and a vague "synergy." It wants sequencing, dual-running cost, change capacity, and a control environment the auditor will not reject.
Worked example: same math, four scored closes
Prompt. Northline Retail (fictional) runs 180 stores. Labor is 22% of US$1.20 billion sales. A new scheduling platform promises 1.5 percentage points less labor cost in year two if 120 stores convert. Conversion costs US$180,000 per store in year one. Leadership wants a go / no-go with a simple payback view.
Shared arithmetic. Labor today: 0.22 × 1.20 billion = US$264 million. A 1.5-point cut on sales is 0.015 × 1.20 billion = US$18 million annual savings if the 120 stores behave like the firm average. Conversion outlay: 120 × 180,000 = US$21.6 million. Simple payback on steady-state savings: 21.6 / 18 ≈ 1.2 years — before you haircut for ramp, training, and stores that refuse the roster rules.
That math is table stakes. The score separates on the close.
| Invite | Close the interviewer rewards | What loses the point |
|---|---|---|
| Deloitte Consulting | Name a 30-store pilot, the KPI (labor % of sales), the 90-day readout, and the expected impact if the pilot hits 1.0 point instead of 1.5 | Ending on "deploy to 120 stores" with no next step |
| PwC Advisory | Dual-running payroll for one cycle, programme office cost, and residual controls so the auditor still signs | Booking the full US$18 million in year one |
| EY Consulting | Written business case: payback hurdle, headcount plan for store ops, vendor exit clause | "AI scheduling will transform retail" with no numbers |
| KPMG Advisory | Same tree, then integrity: what you will not cut if it breaks wage compliance or the control trail; how store managers are brought along | Pure efficiency story that ignores regulated labor rules |
Same candidate, same calculator, four different letters. Practise the ending that matches the invite, not the ending that sounds clever on a podcast.
Ned's rule. If you cannot say in one sentence whether the letter is core Advisory/Consulting or a strategy brand, you are not ready to case. Resolve the entity first; then choose the case style.
How to choose among the four networks
Ignore prestige folklore for a minute. Use a decision table against what you can verify.
| If you want… | Lean toward… | Because… |
|---|---|---|
| Breadth, technology-led transformation, and optional Monitor exposure | Deloitte | Largest network; consulting spans SR&T and T&T; published case guidance stresses next steps |
| A clear strategy brand with a separate career track inside a Big 4 network | Strategy& (PwC) or EY-Parthenon | Both publish distinct strategy / deals careers; do not treat them as "PwC" or "EY" generically |
| Implementation-heavy consulting with volume hiring and assessment-centre machinery | PwC Advisory or EY Consulting | Online assessments and structured early-career funnels are explicit on firm careers pages |
| Risk, regulated industries, and deal-adjacent advisory without pretending you joined MBB | KPMG Advisory / Strategy capability | Smaller network; strategy sits inside Advisory in most markets |
Lifestyle and "hours" claims on forums are directional at best. Treat them as folklore, not data. Confirm the role title on the offer, not the parent logo on the careers homepage.
Pay is another place entity mix-ups destroy offers. Public salary databases disagree with each other and with role-specific postings; I will not invent a single number and call it "the" Big 4 salary. As a working Ned estimate for US campus and MBA-equivalent consulting tracks (not audit), core Big 4 consulting often lands in a lower total-cash band than the strategy brands inside the same networks, which themselves sit below MBB year-one packages. Verify against the posting for your city and level, and never quote Strategy& bands while interviewing for PwC Advisory.
Practice this week
Open the invite. Circle the entity. Then run one timed case that matches that column.
- Write a 60-second "why this entity" answer that would fail if you swapped the logo.
- Do one profitability or operations case and force yourself to end with next steps, owners, and a 90-day metric — Deloitte's published method is a useful template even when you are not interviewing there.
- If you are on a US early-career track, schedule the assessment window the night you apply; EY's 48-hour clock is real, and PwC's application is incomplete until the assessment lands.
For a live rep with scores, start with the free five-minute case at /start (three typed turns, no account), then the ~18-minute voice case at /interview. Everything on CoachNed is open for seven days with no card; then US$120 for a recruiting season or US$49 a month. The drills at /drills/structure and /drills/synthesis are the right muscle for the closes above.
Frequently asked questions
Are Monitor Deloitte, Strategy&, and EY-Parthenon the same as Big 4 consulting?
No. They sit inside Big 4 networks, but recruiting, case style, and often pay bands differ from core Consulting or Advisory. Treat them as separate doors.
Which Big 4 consulting firm is the biggest?
By FY2025 aggregate network revenue, Deloitte at US$70.5 billion leads PwC, EY, and KPMG. That ranking is not a consulting practice ranking and does not tell you which interview you will sit.
Do Big 4 consulting interviews use online assessments?
Often yes on early-career routes. PwC and EY publish mandatory skills or entry assessments for many US roles. Expect the screen before the partner case.
Is KPMG Strategy the same kind of brand as Strategy&?
Not in most markets. Strategy& and EY-Parthenon are marketed as distinct strategy careers. KPMG Strategy is a published capability usually hired through Advisory. Read the letter, not the brochure headline.
Should I prepare McKinsey-style interviewer-led cases for Big 4?
As a house style, usually no. Core Big 4 cases lean more operational and implementation-heavy; strategy brands lean more candidate-driven strategy. Match the entity.
Sources
- Deloitte reports FY2025 revenue — US$70.5 billion aggregate revenue, 470,000+ people, SR&T and T&T growth. Checked 2026-09-24.
- PwC Global Annual Review 2025 financial performance — US$56.9 billion gross revenue; Advisory US$24.3 billion. Checked 2026-09-24.
- EY announces global revenue of US$53.2b for fiscal year 2025 — Consulting and Strategy and Transactions splits. Checked 2026-09-24.
- KPMG delivers 5.1% rise in global revenue — US$39.8 billion continued-operations revenue; Advisory +2.9%. Checked 2026-09-24.
- Preparing for the Case and Scenario Interview | Deloitte US — Five-step case method including next steps. Checked 2026-09-24.
- PwC entry-level recruiting process and FAQs — Assessment required for most entry-level roles. Checked 2026-09-24.
- EY Early Careers skills assessment FAQs — Mandatory assessment, 45–60 minutes, 48-hour window. Checked 2026-09-24.
- Join us | Strategy& — Strategy& as PwC's strategy business. Checked 2026-09-24.
- Careers in EY-Parthenon | EY US — Strategy, deals, corporate finance career surface. Checked 2026-09-24.
- KPMG Strategy services — Strategy capability within the Advisory network. Checked 2026-09-24.
CoachNed is independent and not affiliated with Deloitte, PwC, EY, KPMG, Monitor Deloitte, Strategy&, or EY-Parthenon.