Author: Taylor Warfield, Former Bain Manager and interviewer

Last Updated: April 23, 2026

 

A consulting firm is an organization that provides expert advice to help businesses solve complex problems, improve performance, and make better strategic decisions.

 

Consulting is a massive global industry. According to Mordor Intelligence, the management consulting services market was valued at roughly $358 billion in 2025 and is projected to reach $471 billion by 2031. Firms range from elite strategy practices like McKinsey, BCG, and Bain to small boutique shops focused on a single industry or function.

 

In this guide, I will break down exactly what consulting firms do, the different types that exist, how they are ranked, what a typical project looks like, and how to launch a career in consulting. I am drawing on my years as a Manager at Bain and my experience helping over 6,000 candidates land consulting offers.

 

But first, a quick heads up:

 

McKinsey, BCG, Bain, and other top firms accept less than 1% of applicants every year. If you want to triple your chances of landing interviews and 8x your chances of passing them, watch my free 40-minute training.

 

What Is a Consulting Firm?

 

A consulting firm is a professional services company that sells expertise. Businesses hire consulting firms when they face a problem they cannot solve on their own, need an objective outside perspective, or simply do not have enough internal capacity to handle a critical initiative.

 

The consulting firm assembles a team of consultants (typically 3 to 6 people) who work on the client's problem for a defined period, usually 2 to 6 months. The team collects data, interviews stakeholders, runs analyses, and develops recommendations that the client can act on.

 

According to IBISWorld, there are over 1 million management consulting firms in the United States alone, generating an estimated $412 billion in combined revenue in 2026. The industry spans everything from corporate strategy to IT implementation to human resources.

 

What Do Consulting Firms Actually Do for Their Clients?

 

Consulting firms help clients answer high-stakes business questions. The specific work varies by firm and project, but the core activities are the same: diagnose a problem, analyze data, build a recommendation, and present it to leadership.

 

Here are common examples of what consulting firms do for clients:

 

• Develop corporate strategy: Should we enter a new market? Should we acquire a competitor? How do we grow revenue by 20%?

 

• Improve operations: How do we cut costs in our supply chain? How do we reduce manufacturing defects?

 

• Support mergers and acquisitions: Is this acquisition target worth the price? What synergies can we capture post-merger?

 

• Drive digital transformation: How do we modernize our technology stack? What AI or cloud solutions should we adopt?

 

• Restructure the organization: How should we redesign our org chart after a merger? Which divisions should we spin off?

 

In my experience at Bain, about 90% of consulting work is project-based. A client defines a question, the consulting firm scopes a project to answer it, and the team delivers a final recommendation within a set timeframe. Some projects also include implementation support, where consultants stick around to help execute the changes they recommended.

 

For a deeper look at the daily work, see our guide on what consultants actually do.

 

Why Do Companies Hire Consulting Firms?

 

Companies hire consulting firms for four main reasons. Understanding these reasons helps explain why the consulting industry has grown steadily for decades, even during economic downturns.

 

• Specialized expertise: A consulting partner who has worked with dozens of companies in the same industry brings knowledge that no single internal team can match. According to Fortune Business Insights, around 1.5 million people are employed in the consulting sector globally, creating a deep talent pool of specialists.

 

• Objective outside perspective: Internal teams have biases and blind spots. An external consulting firm can provide an unbiased view on a critical decision, which is especially valuable when executives disagree and need a tiebreaker.

 

• Extra capacity: Sometimes a company knows exactly what it needs to do but its people are already stretched thin. Hiring a consulting team provides an instant injection of smart, capable workers without expanding the permanent headcount.

 

• Third-party credibility: CEOs sometimes need a respected firm to validate a decision for their board of directors. Having McKinsey or Bain endorse a strategy adds credibility that internal analysis cannot provide.

 

What Are the Different Types of Consulting Firms?

 

Consulting firms are not all the same. They differ by what kind of advice they give, who their clients are, and what industries they focus on. There are six major types of consulting, each with distinct career paths and skill requirements.

 

For a complete breakdown of each specialty, read our guide on the different types of consulting.

 

What Is Strategy Consulting?

 

Strategy consulting is the most prestigious type of consulting. Strategy consultants work directly with C-suite executives to solve high-level business questions: Should we enter a new market? Should we acquire this company? How do we respond to a disruptive competitor?

 

According to Fortune Business Insights, the global strategic consulting market was valued at $78.35 billion in 2025, with strategy consulting accounting for roughly 32% of the total consulting market. The top strategy consulting firms are McKinsey, BCG, and Bain, collectively known as MBB.

 

What Is Operations Consulting?

 

Operations consulting focuses on making a company run more efficiently. These consultants help clients optimize supply chains, reduce manufacturing costs, improve quality control, and redesign business processes.

 

According to Mordor Intelligence, operations consulting is the largest consulting segment, accounting for roughly 29% of total management consulting revenue in 2025. Firms like McKinsey, Bain, Deloitte, and Kearney all have strong operations practices.

 

What Is Technology Consulting?

 

Technology consulting (also called IT consulting) helps companies implement software systems, migrate to the cloud, build cybersecurity defenses, and develop digital strategies. According to Verified Market Research, the global IT consulting services market was valued at $562 billion in 2024 and is projected to reach $906 billion by 2032.

 

Accenture is the largest technology consulting firm, but Deloitte, PwC, and IBM Consulting also have massive IT practices. These projects tend to be longer and more implementation-focused than pure strategy work.

 

What Is Financial Consulting?

 

Financial consultants advise companies on transactions, valuations, restructuring, and financial strategy. This includes due diligence for private equity firms considering an acquisition, post-merger integration planning, and bankruptcy advisory.

 

According to Allied Market Research, the global financial advisory services market was valued at $79.4 billion in 2020 and is projected to reach $135.6 billion by 2030. Leading firms in this space include FTI Consulting, Alvarez & Marsal, and Bain (which is known for its private equity practice).

 

What Is Human Resources Consulting?

 

HR consulting firms help organizations manage their people more effectively. This covers talent acquisition, compensation benchmarking, organizational design, leadership development, and change management.

 

According to industry data, global HR consulting services generated approximately $53 billion in revenue in 2022. Major HR consulting firms include Mercer, Korn Ferry, and Willis Towers Watson.

 

Here is a side-by-side comparison of the major types of consulting firms:

 

Type	Focus Area	Example Firms	Typical Clients
Strategy	Corporate strategy, M&A, growth	McKinsey, BCG, Bain	Fortune 500 CEOs, PE firms
Operations	Supply chain, cost reduction, process improvement	Kearney, Deloitte, McKinsey	COOs, VP of Operations
Technology / IT	Cloud migration, cybersecurity, digital strategy	Accenture, IBM, Deloitte	CIOs, CTOs
Financial Advisory	Due diligence, restructuring, valuations	FTI, Alvarez & Marsal, Bain	CFOs, PE firms, boards
Human Resources	Talent, compensation, org design	Mercer, Korn Ferry, WTW	CHROs, People teams
Economic	Litigation support, antitrust, regulatory analysis	NERA, Cornerstone, Analysis Group	Law firms, regulators

 

How Are Consulting Firms Ranked and Tiered?

 

The consulting industry is informally organized into tiers based on prestige, selectivity, compensation, and the type of work each firm is best known for. There is no official body that assigns tiers, but the classification is widely understood across the industry.

 

What Are MBB Firms?

 

MBB stands for McKinsey, BCG, and Bain. These three firms sit at the top of the consulting hierarchy and are considered the most prestigious management consulting firms in the world.

 

McKinsey is the largest with over 30,000 consultants, 130+ offices worldwide, and roughly $16 billion in annual revenue. BCG has about 32,000 employees across 90+ offices and earns roughly $12 billion per year. Bain is the smallest of the three with approximately 18,000 employees, 65 offices, and around $6.5 billion in annual revenue.

 

MBB firms accept less than 1% of applicants every year, making them among the most selective employers on the planet. They pay the highest salaries, attract the strongest talent, and provide the most valuable exit opportunities.

 

To learn more, check out our ranking of the most prestigious consulting firms.

 

What Are Tier 2 Consulting Firms?

 

Tier 2 consulting firms are large, well-respected firms that fall one step below MBB in overall prestige. They still serve Fortune 500 clients, operate globally, and offer competitive pay.

 

Top Tier 2 firms include Oliver Wyman, Kearney, L.E.K. Consulting, Roland Berger, and Strategy& (part of PwC). Many of these firms have deep specializations that rival MBB in specific industries. Oliver Wyman, for example, is widely considered the leader in financial services consulting.

 

According to publicly reported data, Tier 2 firms accept roughly 5% to 15% of applicants, making them still highly competitive. For a complete guide, read our Tier 2 consulting firms ranking.

 

What Are the Big Four Consulting Firms?

 

The Big Four are Deloitte, PwC, EY, and KPMG. Originally founded as accounting firms, they have expanded into consulting, tax, and advisory services. Together, the Big Four generated a combined $219 billion in revenue in 2025, according to their annual financial reports.

 

The Big Four have massive consulting arms, but not all of their consulting work is strategy. A significant portion is implementation, technology, and regulatory compliance. Their strategy practices (Deloitte Monitor, Strategy&, EY-Parthenon, and KPMG Strategy) compete directly with MBB on high-level strategic work.

 

For a detailed breakdown, read our Big Four consulting firms guide.

 

What Are Boutique Consulting Firms?

 

Boutique consulting firms are smaller, specialized firms that focus on a specific industry, function, or niche. What they lack in global scale, they make up for in deep expertise, personalized client relationships, and faster career progression.

 

Examples include Clearview Health Partners (healthcare), ZS Associates (life sciences and sales), Bates White (economic consulting), and IDEO (design and innovation). In Europe, small and mid-sized consulting firms account for roughly 40% of total industry revenue, according to industry data.

 

For a list of 30+ top firms, see our guide on boutique consulting firms.

 

Here is how the four tiers of consulting firms compare:

 

Tier	Example Firms	Selectivity	Starting Salary (US)	Best Known For
MBB	McKinsey, BCG, Bain	~1% acceptance	$110K-$120K (undergrad)	Strategy, prestige, exits
Tier 2	Oliver Wyman, Kearney, L.E.K.	5-15% acceptance	$90K-$110K (undergrad)	Industry specialization
Big Four	Deloitte, PwC, EY, KPMG	10-20% acceptance	$85K-$105K (undergrad)	Scale, diverse services
Boutique	Clearview, ZS, Bates White	Varies widely	$75K-$110K (undergrad)	Niche expertise, agility

 

How Do Consulting Firms Make Money?

 

Consulting firms make money by charging clients for the time and expertise of their consultants. The basic business model is straightforward: staff smart people on client projects and bill for their work at a premium. A single Partner at a top firm typically bills between $800 and $1,200 per hour, according to industry data.

 

There are four common billing models:

 

• Hourly or daily billing: The firm charges for each consultant's time. Day rates at top firms range from $1,000 to $3,000 per consultant, depending on seniority.

 

• Fixed-fee projects: The firm and client agree on a total price for a defined scope of work. This gives the client cost predictability.

 

• Retainer contracts: The client pays a recurring monthly or quarterly fee for ongoing advisory access. This is common for long-term strategic relationships.

 

• Performance-based fees: The firm ties part of its compensation to measurable results, such as cost savings or revenue growth. Bain pioneered this model with its private equity clients.

 

Profitability in consulting comes from leverage. Firms staff projects with a mix of junior and senior consultants. Junior consultants cost the firm much less than they are billed out at, creating a significant margin. According to industry reports, roughly 80% of a consulting firm's revenue comes from repeat clients, which keeps sales costs low.

 

What Does a Typical Consulting Project Look Like?

 

A typical management consulting project lasts 2 to 4 months and follows a structured process. Having worked on dozens of projects at Bain, I can tell you that while every project is different, the workflow is remarkably consistent.

 

Here is how a typical consulting project unfolds from start to finish:

 

• Week 1: Problem definition. The team meets with the client to define the question, align on scope, and identify key stakeholders. The Manager develops a work plan and an initial hypothesis.

 

• Weeks 2 to 6: Analysis and data gathering. Consultants collect internal data, conduct customer interviews, benchmark against competitors, and build financial models. This is the most intensive phase.

 

• Weeks 7 to 8: Synthesis and recommendation building. The team synthesizes findings into a clear recommendation. They build the final presentation (often called the "deck") and pressure-test every conclusion.

 

• Final presentation: The team presents their recommendation to the client's leadership. A good final presentation includes an executive summary, the key findings, the recommended path forward, and an implementation roadmap.

 

Throughout the project, the team gives weekly or biweekly progress updates to the client. Good consulting firms do not disappear for two months and then show up with a surprise recommendation. They keep the client involved at every step.

 

For more on the daily routine, read our guide on what consultants do day-to-day.

 

What Is the Career Path at a Consulting Firm?

 

Consulting firms use a structured, up-or-out career ladder. You either get promoted on schedule or you leave the firm. Most consultants spend 2 to 3 years at each level before advancing.

 

Here are the standard career levels at a top management consulting firm, based on publicly available salary data from Glassdoor and firm disclosures:

 

Title	Experience	Base Salary (US)	Total Comp (US)	Key Role
Analyst / Associate	0-2 years	$95K-$115K	$110K-$150K	Data analysis, research
Consultant / Senior Associate	2-4 years	$150K-$180K	$180K-$220K	Workstream lead
Manager / Project Leader	4-7 years	$200K-$260K	$280K-$380K	Day-to-day team lead
Principal / Associate Partner	7-10 years	$300K-$400K	$500K-$800K	Client relationship, sales
Partner / Senior Partner	10+ years	$500K+	$1M-$5M+	Firm leadership, P&L

 

According to Mordor Intelligence, median partner compensation at top consulting firms reached $672,000 in 2024, with strategy partners earning roughly $1.07 million on average. The up-or-out model means that consulting firms have high turnover. Industry-wide attrition rates hover around 15% to 20% per year.

 

What Are the Exit Opportunities After Working at a Consulting Firm?

 

One of the biggest reasons people join consulting firms is the exit opportunities. Two to three years at a top firm opens doors to careers that would otherwise take a decade to reach.

 

The most common exit paths for former consultants are:

 

• Corporate strategy and leadership: Many consultants move into strategy roles at Fortune 500 companies. Former McKinsey consultants include the current or former CEOs of Google, Morgan Stanley, and Boeing.

 

• Private equity and venture capital: Bain in particular is a major feeder into PE, thanks to its due diligence work. Many PE firms specifically recruit ex-consultants for their analytical training.

 

• Tech companies: Product management, business operations, and strategy roles at companies like Google, Amazon, and Meta are popular landing spots.

 

• Entrepreneurship: The problem-solving skills and broad industry exposure from consulting make former consultants effective founders. Several unicorn startups were founded by ex-consultants.

 

• Nonprofits and government: Some consultants move into public sector roles, leveraging their analytical skills to drive policy and social impact.

 

In my experience, the consultants who get the best exit opportunities are the ones who build genuine expertise in a specific industry during their time at the firm, rather than hopping between unrelated projects.

 

How Do You Get a Job at a Consulting Firm?

 

Getting hired at a top consulting firm is highly competitive. MBB firms accept roughly 1% of applicants, and even Tier 2 and Big Four firms have acceptance rates of 5% to 20%. The recruiting process typically takes 3 to 6 months from application to offer.

 

The standard hiring process involves these steps:

 

• Choose your target firms. Research which firms align with your interests and background.

 

• Network with current consultants. Coffee chats and informational interviews are critical, especially if you attend a non-target school.

 

• Submit a strong application. Your resume needs to highlight leadership, analytical skills, and measurable impact.

 

• Pass screening tests. McKinsey uses the Solve assessment, BCG uses the Pymetrics test, and many other firms use online case simulations.

 

• Ace the case interview. Case interviews are the core of consulting recruiting. You will be given a business problem and must work through it live with your interviewer.

 

• Pass the fit interview. Behavioral and fit questions assess your leadership, teamwork, and motivation for consulting.

 

According to recruiting data from top business schools, roughly one in three MBA students at M7 programs enters consulting. But you do not need an MBA to break in. Strong undergraduates with degrees in business, economics, engineering, or other quantitative fields are recruited directly.

 

Case interviews are the make-or-break step for most candidates. If you want to learn case interviews quickly and save yourself hundreds of hours of trial and error, check out my Case Interview Course.

 

For a complete step-by-step walkthrough, read our guide on how to get into consulting.

 

Frequently Asked Questions

 

How Big Is the Consulting Industry?

 

The consulting industry is enormous. According to Mordor Intelligence, the global management consulting market was valued at roughly $358 billion in 2025 and is expected to grow to $471 billion by 2031. When you include technology consulting, financial advisory, and other specialties, the total consulting market exceeds $1 trillion globally.

 

What Is the Difference Between a Consulting Firm and a Staffing Agency?

 

A consulting firm provides expert advice and delivers recommendations to solve specific business problems. A staffing agency provides temporary workers to fill roles. Consultants are hired for their specialized knowledge and analytical skills, not just to fill a seat. Consulting projects have defined scopes, timelines, and deliverables, while staffing is typically open-ended.

 

Is Consulting a Stressful Job?

 

Consulting can be demanding. Long hours (50 to 70+ hours per week during busy periods), frequent travel, and high-pressure client expectations are common. Industry-wide attrition rates of 15% to 20% per year reflect the pace. That said, many consultants value the steep learning curve, strong compensation, and the doors the experience opens.

 

Can You Work at a Consulting Firm Without an MBA?

 

Yes. All major consulting firms hire undergraduates and experienced professionals without MBAs. At MBB firms, roughly half of new hires are undergraduates or advanced degree holders (PhDs, JDs, MDs) rather than MBAs. Strong analytical skills, leadership experience, and a track record of achievement matter more than any single degree.

 

What Is the Difference Between Management Consulting and Strategy Consulting?

 

Management consulting is the broad umbrella term that covers strategy, operations, organizational, and implementation consulting. Strategy consulting is a subset focused specifically on high-level corporate decisions like market entry, mergers, and competitive positioning. All strategy consulting is management consulting, but not all management consulting is strategy work.

 

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