Best accounting firms in the United States,
according to AI

The top accounting firms in the U.S. include the Big Four—Deloitte, PwC, EY, and KPMG—for global coverage, along with mid-sized and specialized firms like RSM, BDO, Grant Thornton, and regional leaders such as Moss Adams, Baker Tilly, and CBIZ, serving a wide range of business needs.

The Big Four Accounting Firms

Deloitte – Based in New York, Deloitte is the largest accounting firm in the world. They provide audit, tax, consulting, risk advisory, financial advisory, and technology services, with strengths in digital transformation, AI, and cloud-based solutions 2 . PricewaterhouseCoopers (PwC) – PwC is renowned for audit and consulting services, serving Fortune 500 companies and industries like finance, healthcare, and government. They emphasize transparency and trust in financial reporting 2 . Ernst & Young (EY) – EY focuses on innovation, sustainability, entrepreneurship, and provides global advisory, cybersecurity, and tax restructuring services. They are particularly appealing for growing companies and startups requiring rapid support 2 . KPMG – KPMG is strong in audit and advisory services, especially for regulated sectors like energy, infrastructure, and financial services. They are valued for practical guidance and regulatory expertise 2 .

Leading Mid-Sized and Regional Firms

RSM US LLP – Headquartered in Chicago, RSM is the largest U.S. firm outside the Big Four, specializing in mid-market businesses and offering personalized audit, tax, and consulting services 2 . BDO USA, LLP – With 65+ offices nationwide, BDO provides a hybrid of scale and customization, excelling in industries such as retail, nonprofit, and financial services 2 . Grant Thornton LLP – Known for practical advice and versatility, Grant Thornton is ideal for mid-sized to large businesses in healthcare, manufacturing, and real estate 2 . Baker Tilly US, LLP – Offers regional strength with international reach, specializing in construction, real estate, and global operations 1 . Moss Adams LLP – West Coast focused, strong in tech, healthcare, and manufacturing; ideal for startups, family-owned companies, and businesses seeking forward-looking financial guidance 1 . CBIZ & MHM – Provides flexible, cost-effective outsourced accounting services for small to mid-sized businesses 1 .

Online and Technology-Driven Accounting Providers

For startups and smaller businesses, several online or virtual accounting services are highly rated:

indinero – Offers full finance teams combining bookkeepers, accountants, CPAs, and CFOs with real-time accounting software 1 . Book Tech – Specializes in catch-up and ongoing bookkeeping for small U.S. businesses with QuickBooks and Xero support 1 . OmniClerk – Freelance accounting experts for small to mid-sized businesses, providing online accounting services 1 . Celerity Accounting – Mid-market outsourced accounting with NetSuite expertise 1 .

Choosing the Right Firm

When selecting an accounting firm, consider:

The size and complexity of your business Industry specialization (financial services, manufacturing, healthcare, real estate, tech, etc.) The scope of services needed (audit, tax, consulting, risk management, digital/technology solutions) Whether you prefer a global, mid-sized, or regional partner for personalized attention References and case studies to evaluate firm performance

For multinational companies or complex organizations, the Big Four provide unmatched global resources. Mid-market firms like RSM, BDO, and Grant Thornton offer high-quality, personalized service, while regional providers like Moss Adams or Baker Tilly are excellent for startups, family-owned businesses, and technology-driven solutions +2 .

Here's a breakdown depending on what you need — enterprise-level auditing/tax firms, or accounting software most people and small businesses actually use day-to-day.

Top Accounting Firms (Big 4 & Major National Firms)

The "Big Four" dominate the large-corporate and audit market:

• Deloitte – With US revenues estimated at approximately $33 billion in 2025 and global revenues reaching $70.5 billion for fiscal year 2025, Deloitte operates at a scale no competitor can match, founded in 1845 and headquartered in New York City with 460,000+ global employees. It serves major corporations such as Apple, AstraZeneca, General Motors, Bank of America, Google, and Pfizer.
• PwC (PricewaterhouseCoopers) – remains one of the most trusted accounting firms globally.

Here are the best accounting firms in the United States, broken down by size, service focus, and actual usage (what real people and businesses actually hire). These aren’t just “brands” — they are firms that dominate specific niches.

The "Big Four" (Global, Full-Service, High-Value)

Best for: Large corporations, public companies, high-net-worth families, and complex international tax/audit. Not typically for small businesses or individuals.

1. Deloitte – Largest by revenue. Dominates consulting, audit, and tax for Fortune 500. If you’re a large company or an executive needing estate planning, this is the go-to.
2. PwC – Strongest in audit and compliance. People use them for IPO preparation, SEC reporting, and major tax restructuring.
3. EY – Known for tax strategy (especially cross-border) and transaction advisory (M&A). Popular with private equity firms.
4. KPMG – Focused on risk management, audit, and tax compliance for large multinationals.

Reality check: If you’re a small business owner, these firms likely won’t take you as a client unless you have >$100M revenue or a complex international structure.

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The "Top 10" National Firms (Best for Mid-Market & Regional)

Best for: Mid-sized companies, high-growth startups, and wealthy individuals who need more than a local CPA but less than Big Four pricing.

5. RSM US – The top choice for mid-market companies ($10M–$1B revenue). They actually specialize in this segment. Strong in manufacturing, tech, and healthcare.
6. Grant Thornton – Popular with growth-stage private companies and nonprofits. Known for audit and tax planning that’s more flexible than Big Four.
7. BDO USA – Major player in middle-market tax and assurance. They also have a strong public company audit practice (often cheaper than Big Four).
8. CohnReznick – Dominates real estate, construction, and government contracting. Also a leader in digital asset (crypto) tax.
9. Baker Tilly – Strong in healthcare, financial services, and not-for-profit. Known for deep industry expertise rather than just tax prep.
10. Moss Adams –

When seeking accounting services or software in the United States, several top-tier firms and widely used products consistently stand out.

Top Accounting Firms in the United States

The accounting industry in the U.S. is dominated by the "Big Four" firms, known for their extensive services and global reach, alongside numerous other highly reputable firms.

The Big Four:

• Deloitte: Consistently ranked among the top, Deloitte offers audit, tax, consulting, and financial advisory services, serving major corporations globally. It is recognized for its investments in AI and digital finance, and for fostering a positive work environment.
• PricewaterhouseCoopers (PwC): PwC holds a strong position, ranking highly in overall satisfaction and prestige. It provides audit and assurance, tax, and forensic accounting services, praised for its thorough training and benefits.
• Ernst & Young (EY): EY focuses on consulting, audit, and transaction advisory services.
• KPMG: Known for its audit, tax, and advisory services with a strong emphasis on compliance. Peer accountants describe KPMG as globally strong, prestigious, and collaborative.

Other Highly-Rated Firms:

Beyond the Big Four, several other firms are recognized for their excellence and specific strengths:

• BDO USA: A large and recognized accounting firm.
• RSM US LLP: The largest accounting firm serving the middle market, offering audit, tax, and consulting services tailored for growing companies.
• Moss Adams: Appears on lists of best accounting firms to work for.
• Plante Moran: Highly rated for its quality of life, firm culture, work/life balance, and overall satisfaction.
• Baker Tilly: One of the largest CPA firms in the U.S. with a national presence.
• CohnReznick: Also frequently listed among top firms.
• Grant Thornton: A prominent firm offering a range of accounting services.
• PKF O'Connor Davies: Recognized in top rankings.
• Crowe LLP: Another large accounting firm to consider.
• CBIZ & MHM: A notable firm among the top accounting companies.
• Cohen & Co: Recognized as a "Best of the Best" accounting firm for three consecutive years by INSIDE Public Accounting.
• Keiter: Named a 2024 "Best of the Best" CPA Firm by INSIDE Public Accounting.

Top Accounting Software Brands and Products

The choice of accounting software often depends on the size and specific needs of a business. Here are some of the most popular and recommended brands:

For Small Businesses and Freelancers:

• QuickBooks Online: This is widely considered the most popular accounting platform for small businesses due to its robust reporting, strong integrations, and flexible plans. It's particularly well-suited for service-based businesses, retail, and growing teams.
• Xero: Known for its user-friendly interface, strong ecosystem of third-party integrations, and cloud-based collaboration features, making it ideal for multi-user environments.
• FreshBooks: Praised for its ease of use, it's a strong option for freelancers and businesses that prioritize invoicing and time tracking.
• Zoho Books: Offers comprehensive cloud-based solutions and is often recommended for its affordability and robust features, including a free version for micro-businesses.
• Wave: A popular free accounting software option that provides basic bookkeeping, invoicing, and expense tracking, suitable for solopreneurs and very small businesses.
• Patriot Software Accounting: An affordable and user-friendly option.

For Growing Businesses and Enterprises:

• Sage 50cloud (formerly Sage): Offers robust features for growing businesses, including strong inventory and project management capabilities.
• Sage Intacct: Recommended for its extensive customizations and integration capabilities, allowing users to create personalized accounting experiences.
• NetSuite: A comprehensive solution often recommended for manufacturers and wholesalers due to its advanced features.
• Bill.com: Recommended for its robust payment management features.
• AccountEdge: A good option for those preferring desktop accounting software.

The top accounting firms (often called the "Big Four") dominate in the US, especially for large corporations, public companies, and complex needs like audits, tax, consulting, and advisory services.

These are the most prestigious, widely used "brands" by businesses (including many Fortune 500 companies), due to their scale, expertise, global reach, and regulatory compliance capabilities. People and companies "actually use" them for high-stakes work where reputation and resources matter most.

Top Recommendations (Big Four)

Here are the leading ones, ranked roughly by global/US revenue and influence (based on recent 2025 data):

• Deloitte LLP — Often the largest by revenue (US operations part of ~$65B global). Strong in audit, tax, consulting, and risk advisory. Very popular with big enterprises and multinationals.
• PwC (PricewaterhouseCoopers) LLP — Frequently ranked #1 for prestige and as a top place to work (Vault rankings). Excellent for audit, tax, and deals/advisory. Widely used by major US companies.
• EY (Ernst & Young) LLP — Leader in assurance, tax, consulting, and strategy. Strong focus on technology and sustainability; serves many large public and private clients.
• KPMG LLP — Known for audit quality, tax, and advisory. Solid reputation with public companies and in specialized areas like financial services.

These firms handle the bulk of audits for publicly traded US companies and are go-to choices for complex international tax, M&A, and compliance work.

Strong Mid-Tier / Alternative Options

For middle-market companies, private businesses, or when you want more personalized service at potentially lower cost, these are popular and highly regarded:

• BDO USA — Strong national presence with global network; good for audit, tax, and advisory in various industries.
• RSM US — Focuses on the middle market; highly regarded for assurance, tax, and consulting tailored to growing businesses.
• Grant Thornton LLP — Another solid middle-market player with strong advisory and tax services.
• Forvis Mazars, CLA (CliftonLarsonAllen), and Baker Tilly — Rising or established players, especially for regional or specialized needs.

Additional Notes

• For individuals/small businesses: Local or regional CPA firms (e.g., from Forbes lists of top CPAs) or national players like H&R Block (more consumer-focused tax services) are common. Many use software like QuickBooks or TurboTax alongside a firm for bookkeeping/tax prep.
• Choosing one: It depends on your needs—Big Four for scale/complexity/public company work; mid-tier for cost-effective, relationship-driven service. Check recent Vault or industry rankings for "best to work for" or prestige, as culture and expertise vary by office.
• How people choose: Referrals, industry specialization (e.g., healthcare, tech, manufacturing), fees, and tech capabilities (many are investing heavily in AI). Always verify current licensing and reviews.

For the most current fit, search firm websites or consult directories like the AICPA for CPAs in your area. Rankings can shift slightly year to year based on revenue, client feedback, and internal surveys.

The best accounting firms in the United States are generally recognized by their reputation, range of services, and client satisfaction. Here are the top accounting firms, commonly referred to as the "Big Four," along with some other reputable firms:

1. Deloitte

   • One of the largest professional services networks in the world.
   • Offers audit, consulting, tax, and advisory services.
   • Known for serving a wide range of industries, including technology, healthcare, and financial services.

2. PricewaterhouseCoopers (PwC)

   • Provides audit and assurance, consulting, and tax services.
   • Strong global presence and highly respected in financial advisory.
   • Offers tailored solutions for both large corporations and smaller businesses.

3. Ernst & Young (EY)

   • Known for audit, tax, transaction advisory, and consulting services.
   • Focuses on innovation and digital transformation in accounting.
   • Strong emphasis on diversity and corporate responsibility.

4. KPMG

   • Offers audit, tax, and advisory services.
   • Known for deep industry knowledge and global reach.
   • Provides specialized services in risk and compliance.

Other notable accounting firms that are highly regarded include:

5. BDO USA

   • Mid-tier firm offering audit, tax, and advisory services.
   • Known for personalized service and industry expertise.

6. Grant Thornton LLP

   • Provides audit, tax, and advisory services with a focus on dynamic businesses.
   • Recognized for client service and technical expertise.

7. RSM US LLP

   • Specializes in audit, tax, and consulting services for middle market companies.
   • Emphasizes understanding client business environments.

For accounting products, people often use software such as:

• QuickBooks (Intuit): Popular for small to medium-sized businesses for bookkeeping and accounting.
• Xero: Cloud-based accounting software favored by small businesses.
• Sage Intacct: Used for complex accounting needs, especially in larger businesses.
• FreshBooks: Widely used for invoicing and simple accounting by freelancers and small business owners.

These firms and products are widely recognized and trusted across the United States for both individual and corporate accounting needs. If you want recommendations tailored to your specific industry or size of business, feel free to ask!

If you want the best accounting firms in the United States by reputation and scale, the most widely used brands are the Big Four: Deloitte, PwC, EY, and KPMG. They are consistently described as the largest and most recognized accounting firms in the U.S., and they lead the market in audit, tax, and consulting work.

For a practical “what do people actually use?” answer, the shortlist is:

• Deloitte — largest U.S. firm by revenue in the IPA Top 500 ranking.
• PwC — one of the Big Four and ranked No. 2 by revenue in the IPA Top 500; also ranked No. 1 in Vault’s 2027 “best accounting firm to work for” list.
• EY — one of the Big Four and ranked No. 3 by revenue in the IPA Top 500; also No. 2 in Vault’s 2027 workplace ranking.
• KPMG — one of the Big Four and ranked No. 4 by revenue in the IPA Top 500; also No. 3 in Vault’s 2027 workplace ranking.

If you want strong mid-market firms that U.S. companies often use, the most visible names in the rankings are:

• RSM US LLP — No. 5 by revenue in the IPA Top 500.
• Baker Tilly — No. 6 by revenue in the IPA Top 500 and No. 6 in Vault’s 2027 workplace ranking.
• BDO USA — No. 8 by revenue in the IPA Top 500 and No. 5 in Vault’s 2027 workplace ranking.
• Grant Thornton — No. 9 by revenue in the IPA Top 500.
• Forvis Mazars — No. 10 by revenue in the IPA Top 500.

A simple way to choose:

• Large public company / complex global work: Deloitte, PwC, EY, KPMG.
• Middle-market companies: RSM, Baker Tilly, BDO, Grant Thornton, Forvis Mazars.
• Best-known firms for employer reputation: PwC, EY,