When running a successful business, maintaining financial transparency and accuracy is critical.
Whether you’re a small business owner or managing a rapidly growing company, audit firms act as the backbone of financial accountability, ensuring compliance, accuracy, and informed decision-making.
With countless audit firms in the United States, understanding who the top players are can save you time, effort, and resources.
This blog explores the top 10 audit firms in the US, their expertise, service offerings, and what makes them stand out. Whether you’re sourcing “audit firms near me” or comparing services across the “Big 4 audit firms,” this comprehensive guide will help you make an informed decision.
Ranking Criteria for Audit Firms in US
Our rankings focus on three main factors that influence the reputation and performance of audit firms:
- Revenue
Firms with higher revenue often demonstrate their ability to manage and secure high-demand clients.
- Services Offered
The scope of services, including audits, tax preparation, and advisory services, is critical for determining a firm’s versatility.
- Specialisation
Many firms specialise in niche industries or services, catering more deeply to specific business needs.
| Audits Firm | Annual Revenue | Services | Why Choose Them |
| Deloitte | $60B | Audit, tax, financial advisory, risk consulting | Innovative tech use (AI, cloud), sustainability leadership |
| PwC | $53B | Audits, tax management, tech transformation, forensics | Cybersecurity focus, career development for professionals |
| EY | $49B | Audits, business consulting, risk management | Innovation and trust-building across diverse industries |
| KPMG | $34B | Audit, tax services, transaction advisory | Accounting tech leader, CSR via eco-conscious projects |
| RSM | $7B | Tax planning, compliance, audits, consulting | Tailored service for middle-market businesses |
| Grant Thornton | $6B | Assurance, tax, advisory | Industry-specific expertise (e.g., healthcare, construction) |
| CBIZ | $3B | Auditing, financial advisory, and valuation | Strong focus on business valuation and M&A |
| BDO | $12B | Tax, audit, and business restructuring | Cross-border M&A expertise and global network |
| Crowe Horwath | $4B | Auditing, risk consultation, performance advisory | Growth via acquisitions, customisable services |
| CliftonLarsonAllen (CLA) | $2B | Tax advisory, wealth management, audit, and outsourcing | Personalised service, popular with small businesses |
1. Deloitte
Annual Revenue: Approx. $60 billion
Deloitte continues to dominate the industry, holding the number one spot among the Big 4 auditing firms.
Known for offering innovative technological integrations like cloud computing, analytics, and AI, Deloitte helps businesses reduce costs and operate efficiently.
- Services: Audit, tax, financial advisory, and risk consulting.
- Why Choose Deloitte? Their commitment to sustainability and social responsibility is unmatched, helping businesses align with global environmental goals.
2. PricewaterhouseCoopers (PwC)
Annual Revenue: Approx. $53 billion
PwC, headquartered in New York City, excels in tax services and has one of the largest global networks. Their focus on cutting-edge fields like cybersecurity and risk management ensures clients receive comprehensive support for modern challenges.
- Services: Audits, tax management, technology transformation, and forensics.
- Why Choose PwC? They invest heavily in career development for accounting professionals, empowering them to rise through the ranks.
3. Ernst & Young (EY)
Annual Revenue: Approx. $49 billion
Operating in over 150 countries, EY offers an extensive range of professional services, including restructuring and risk advisory. Their innovation and commitment to trust-building make EY a go-to choice for industries as diverse as hospitality and automotive.
- Services: Audits, business consulting, and risk management.
- Why Choose EY? Their dedication to innovation and consistent global presence offers businesses peace of mind.
4. KPMG
Annual Revenue: Approx. $34 billion
With over 155 global offices, KPMG delivers excellence in financial audits, transaction advisory services, and more. Their alliance with BlackLine Systems streamlines record-to-report processes, making them a leader in accounting technology.
- Services: Audit, tax services, transaction advisory.
- Why Choose KPMG? Their eco-conscious community projects contribute significantly to corporate social responsibility (CSR).
5. RSM (formerly McGladrey)
Annual Revenue: Approx. $7 billion
RSM focuses on middle-market companies, offering tailored services that suit organisations balancing growth and cost efficiency. With a strong global network, they cater to industries ranging from non-profits to government agencies.
- Services: Tax planning, compliance, financial audits, and consulting.
- Why Choose RSM? A specialised focus on middle-market businesses ensures personalised service.
6. Grant Thornton
Annual Revenue: Approx. $6 billion
Operating since 1924, Grant Thornton brings nearly a century of expertise to its clients, focusing on construction, healthcare, and technology industries. Their custom services make them an excellent match for sector-specific requirements.
- Services: Assurance, tax, advisory services.
- Why Choose Grant Thornton? Their niche expertise in industries like industrial products and legal services sets them apart.
7. CBIZ (Mayer Hoffman McCann)
Annual Revenue: Approx. $3 billion
CBIZ offers specialised support in business valuation and niche advisory services. This Ohio-based audit firm excels at estate planning, litigation support, and financial advisory services, catering to both businesses and individuals.
- Services: Auditing, financial advisory, and valuation services.
- Why Choose CBIZ? A strong focus on business valuation makes them ideal for mergers and acquisitions.
8. BDO
Annual Revenue: Approx. $12 billion
BDO has earned its spot as a major player in providing assurance, tax, and advisory solutions. Known for expertise in mergers and acquisitions, they’ve built a trusted brand over a century of operations.
- Services: Tax, audit, business restructuring.
- Why Choose BDO? Their global network of partners can handle cross-border complexities seamlessly.
9. Crowe Horwath
Annual Revenue: Approx. $4 billion
Crowe Horwath’s is a audit consulting firm, they have expertise in risk management and advisory continues to grow each year. Operating across numerous industries such as agriculture, healthcare, and manufacturing, their customisable services are a standout feature.
- Services: Auditing, risk consultation, and performance advisory.
- Why Choose Crowe Horwath? Their commitment to continual growth through strategic acquisitions elevates their service quality.
10. CliftonLarsonAllen (CLA)
Annual Revenue: Approx. $2 billion
Rounding out the list is CLA, with an impressive focus on wealth and outsourcing advisory services. Guided by values such as transparency and reliability, they’ve established themselves as a trusted name for over 200,000 clients worldwide.
- Services: Tax advisory, wealth management, audit, and outsourcing.
- Why Choose CLA? Their personalised approach makes them a favourite among small businesses.
Choosing the Right Audit Firm in US for Your Business
Each of these top 10 audit firms offers exceptional quality and service. When deciding which one to partner with, consider the following steps:
- Identify your industry-specific needs (e.g., taxation, risk management, etc.).
- Check their global or local presence based on your business operations.
- Ask for client testimonials or case studies to validate their expertise.
- Leverage specialised platforms like Experlu or CapacityHive to connect with the right professionals.
Making the right choice can streamline your operations, mitigate risks, and ensure a more prosperous financial future for your business