Published 8 min read
Big 4 Consulting Companies: How Deloitte, PwC, EY, and KPMG Really Compare
The Big 4 consulting companies are Deloitte, PwC, EY, and KPMG, the four global professional services firms that grew out of accounting and now run consulting practices large enough to compete with McKinsey, BCG, and Bain on strategy work. Deloitte is the largest by revenue and headcount, KPMG is the smallest, and each has built or bought a strategy arm (Monitor Deloitte, Strategy&, EY-Parthenon, and KPMG Strategy) that sits alongside a much larger core of advisory, technology, and risk consulting. Below I break down what actually separates the four firms, because "Big 4" as a label hides more than it reveals.
I spent years on the other side of the table at McKinsey, reading resumes in batches of about 400 and running interviews for candidates who often had a Big 4 offer sitting in their inbox as a comparison point. Most of those candidates were comparing apples to oranges without realizing it. The four firms are not interchangeable, and neither is a Big 4 offer interchangeable with an MBB one.
Where the "Big 4" label comes from
The term dates back to accounting, not consulting. There used to be a Big 8, then a Big 6, then a Big 5, and after the Arthur Andersen collapse following the Enron scandal in the early 2000s, the industry consolidated into the Big 4 we have today. Audit and tax are still the historical core business at each firm. Consulting grew alongside it, got spun off or firewalled in some markets for independence reasons, and then grew back into a business bigger than the audit practice at some of the four.
That history still shapes the work. Audit independence rules mean a firm cannot always sell consulting services to a company its audit arm already covers, which is one reason clients often work with two or three of the four firms rather than picking a single one for everything.
How the four firms actually differ
Revenue and headcount are the easiest way to see that "Big 4" is not four equal-sized companies. Deloitte is roughly 25 percent larger than PwC by revenue and nearly twice the size of KPMG.
| Firm | FY2025 global revenue (approx.) | Employees worldwide (approx.) | Strategy arm |
|---|---|---|---|
| Deloitte | $70.5 billion | 473,000 | Monitor Deloitte |
| PwC | $56.9 billion | 365,000 | Strategy& |
| EY | $53.2 billion | 406,000 | EY-Parthenon |
| KPMG | $39.8 billion | 276,000 | KPMG Strategy |
Figures are per each firm's own FY2025 public reporting; fiscal year-end dates differ by firm (Deloitte's runs to May, PwC and EY's to June, KPMG's to September), so treat these as directional rather than a same-day snapshot, and check each firm's newsroom for the current cycle before you quote a number in an interview.
Beyond size, each firm has a lean. Deloitte's consulting brand leans hardest into technology and operations at scale. PwC's Strategy& is the old Booz & Company and carries the most standalone strategy-house pedigree of the four. EY-Parthenon has grown into the largest strategy practice among the Big 4, with a heavy tilt toward private equity due diligence and M&A. KPMG's advisory arm skews toward regulated industries, financial services, and risk work rather than pure corporate strategy. None of that is destiny. Individual offices and practice groups vary, but if you are choosing where to apply, the lean is a real signal.
Big 4 vs MBB: the difference that actually matters
Most candidates comparing Big 4 to McKinsey, BCG, and Bain focus on prestige, and that is the least useful lens. The real differences are project type, client seniority, and pace. MBB engagements skew toward CEO-level strategy questions with smaller teams and higher stakes per project. Big 4 engagements skew toward larger-scale implementation work, technology rollouts, and operational fixes, often for the same client over a longer stretch, with bigger teams and more junior-to-senior ratio on staffing. Neither is objectively better work. They are different jobs that both get called consulting.
Compensation follows the same pattern rather than a clean firm-vs-firm split. I go into the full comparison, including where the lines blur, in MBB vs Big Four Consulting. If you are trying to decide which path fits you rather than which name sounds better at a dinner party, that is the article to read next.
What the interview process actually looks like
Every Big 4 firm still uses some version of a case interview, but it is generally a lighter touch than what MBB runs. Expect a resume and cover letter screen, often an online assessment or numerical reasoning test, one or two case-based conversations that tend to be shorter and less mathematically dense than an MBB case, and a fit or behavioral round that carries real weight in the final decision. Some offices add a group exercise where you solve a problem alongside other candidates, which tests how you behave on a team as much as how you think alone.
If you have never done a case interview before, start with what a case interview actually is before you start memorizing frameworks. The mechanics you build for a Big 4 case (structuring a problem, doing clean math, giving a top-down answer) are the same mechanics that carry over if you ever interview at MBB later, so there is no wasted effort in preparing properly even for a "lighter" process.
What the work is actually like once you are in
The day-to-day gap between Big 4 and MBB is bigger than most students expect going in. Big 4 project teams tend to be larger, project timelines tend to run longer, and a bigger share of the work sits closer to implementation than to blank-page strategy. That does not make it lesser work. It makes it different work, and for a lot of people it is a better fit: steadier hours on average, deeper specialization in one industry or technology stack, and a more predictable path to a defined subject-matter expert role. I break down what the actual day looks like across firm types in what a consultant does all day, which is worth reading before you assume "consulting" means the same job everywhere.
Compensation, in real terms
Pay varies by firm, service line, and market, and the strategy arms pay meaningfully more than the core advisory practice at the same firm. As of the 2026 hiring cycle, core Big 4 consulting and advisory roles for new graduates generally land somewhere in the $80,000 to $105,000 total compensation range in the US, per publicly available compensation trackers. The strategy arms (Monitor Deloitte, Strategy&, EY-Parthenon, KPMG Strategy) generally pay a meaningful premium above that, often into the $100,000 to $160,000-plus range depending on market and role, closing much of the gap with MBB associate pay rather than sitting far below it. Treat these as ranges, not promises. Compensation bands shift every cycle and vary heavily by city, so confirm the current number directly with recruiting before you make a decision based on pay alone.
Who should actually target Big 4 over MBB
A few honest signals, drawn from the pattern I saw in thousands of resumes and interviews.
- You want deep expertise in one industry or technology (SAP, cloud, cybersecurity, tax-adjacent advisory) rather than generalist strategy exposure
- You want a defined, less brutal travel and hours pattern on average, recognizing this still varies by office and project
- You are targeting a specific geography where a Big 4 office is strong and an MBB office is thin or nonexistent
- You want a faster, less selective path into consulting as a first job, with the option to move firms or specialize later
- You are drawn to implementation and delivery work more than to the blank-page strategy problems MBB is built around
If none of that describes you and you are set on the strategy end of the spectrum, MBB consulting is worth reading to understand what you would be aiming for and what it actually takes to get an offer there.
The bottom line
Deloitte, PwC, EY, and KPMG are not one firm wearing four names. They differ in size, in what their consulting arms specialize in, in how hard their interview process leans on case mechanics versus fit, and in what the actual work looks like once you have the offer. Pick based on the work and the practice area, not the logo, and if you want to see how all of this stacks up against the rest of the industry, the top consulting firms ranked by tier is the next place to look.
Go deeper
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Frequently Asked Questions
What are the Big 4 consulting companies?
Deloitte, PwC, EY, and KPMG, the four global professional services firms that started in accounting and audit and built consulting practices large enough to compete with McKinsey, BCG, and Bain on parts of the strategy market. Deloitte is the largest by revenue and headcount, KPMG the smallest.
Is Big 4 consulting the same as MBB consulting?
No. Big 4 firms generally run larger project teams, longer engagements, and more implementation-heavy work, while MBB skews toward smaller teams on blank-page strategy questions for the most senior client stakeholders. Both get called consulting, but the daily work and the interview process differ meaningfully.
Which Big 4 firm has the best consulting practice?
It depends on what you want to work on rather than a single ranking. Deloitte leans hardest into technology and operations at scale, PwC's Strategy& carries the strongest standalone strategy pedigree, EY-Parthenon has grown into the largest strategy arm with a tilt toward M&A and private equity, and KPMG skews toward regulated industries and risk.
How hard is it to get a case interview offer at a Big 4 firm?
Generally less selective than MBB, but still a real filter, especially for the strategy arms like Monitor Deloitte or EY-Parthenon, which run interview processes closer to MBB's in difficulty. Core advisory roles usually involve a lighter case component alongside a heavier behavioral and fit round.
Do Big 4 consulting firms pay as well as McKinsey, BCG, and Bain?
Core Big 4 advisory roles generally pay less than MBB at the entry level, while the strategy arms pay a real premium over core advisory and close much of that gap. Compensation bands shift by cycle and city, so confirm current numbers with recruiting rather than relying on last year's figures.
Should I choose a Big 4 firm or MBB for my first consulting job?
Choose based on the kind of work and specialization you want, not the name recognition alone. If you want deep industry or technology expertise, a defined career track, or a strong local office in a market where MBB has little presence, Big 4 is often the better fit rather than a fallback.