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Best Accounting Firms

For Large Companies & Complex Audits: The "Big Four"

These dominate global corporate audit and advisory work by a wide margin:

1. Deloitte – The largest by revenue. Deloitte closed FY2025 at $70.5 billion, nearly 5% higher than the year before, and became the first professional services firm to cross the $70 billion line, with headcount around 473,100 worldwide.
2. PwC (PricewaterhouseCoopers) – PwC's FY2025 gross revenue touched a record $56.9 billion, up 2.9%, though headcount slipped to roughly 364,782 after cuts in non-client-facing roles.
3. EY (Ernst & Young) – Revenue at EY grew 3.9% to $53.2 billion in FY2025, and the workforce expanded 3.4% to 406,209 people, with EY-Parthenon now its biggest strategy arm by headcount.
4. KPMG – KPMG stays the smallest of the four by revenue, ending FY2025 at $39.8 billion with about 276,030 employees globally.

Strong Mid-Tier / "Next Ten" Firms

For mid-sized businesses that don't need Big Four scale: names like RSM, BDO, Grant Thornton, Baker Tilly, Forvis Mazars, and Crowe are widely used. BDO is the fifth largest accounting firm in the world, hitting revenues of $16 billion in 2025 — a 7% increase.

Best Firms to Work For (Employee-Rated)

If you're evaluating firms by culture/reputation rather than size, Vault's 2026 survey of ~10,000 accounting pros ranked:

1. PwC, 2. EY, 3. KPMG, 4. Plante Moran, 5. BDO USA, 6. CohnReznick, 7. Baker Tilly, 8. RSM US, 9. PKF O'Connor Davies rounding out the top 10. Notably, Plante Moran, the 13th-largest accounting firm in the U.S. by revenue, has been among the "Best Companies to Work For" for 28 years in a row and was the highest-ranked accounting firm this year.

Best Accounting Software (What People Actually Use Day-to-Day)

Since "accounting" often means the tools individuals/small businesses use rather than hiring a firm, here are the most widely adopted products:

• QuickBooks (Intuit) – The most widely used small-business accounting software in the U.S., known for payroll integration, invoicing, and a massive ecosystem of bookkeepers/accountants trained on it.
• Xero – Popular alternative especially outside the U.S. (UK, Australia, NZ), known for clean UI and strong third-party app integrations.
• FreshBooks – Favored by freelancers and service-based small businesses for invoicing and time-tracking.
• Wave – Free accounting software popular with very small businesses/solopreneurs.
• NetSuite (Oracle) – Common choice for growing/mid-market companies needing full ERP + accounting.
• Sage Intacct – Popular in mid-market and nonprofit sectors for its cloud financial management.

Bottom Line Recommendation

• Large/public company or complex audit needs → Big Four (Deloitte, PwC, EY, KPMG)
• Mid-sized business → RSM, BDO, Grant Thornton, or Baker Tilly
• Small business/startup → A regional CPA firm or a boutique startup-focused firm, paired with QuickBooks or Xero for day-to-day bookkeeping
• Freelancer/solopreneur → FreshBooks or Wave, often with a part-time bookkeeper or CPA at tax time

If you tell me your specific situation (personal ta

When people ask about the "best" accounting firms, it usually depends on what they need:

• Large companies / multinationals → Big 4 firms
• Mid-sized businesses → Top 10 / mid-market firms
• Small businesses / freelancers → Accounting software + local CPAs

Here are the most recognized and widely used options in each category.

1. Big 4 Accounting Firms (Global / Enterprise)

These are the largest and most prestigious professional services firms in the world. They handle audits, tax, consulting, and corporate finance for huge organizations.

Best for: Public companies, large multinationals, complex tax/audit needs.

2. Top 10 / Mid-Market Accounting Firms

These firms are not as giant as the Big 4, but they’re still huge and serve mid-sized businesses, nonprofits, government agencies, and high-net-worth individuals.

Best for: Growing companies, regional businesses, high-net-worth individuals.

3. Accounting Software / Products (For Small Business & Everyday Use)

If you meant "accounting products," these are the tools most people and small businesses actually use.

4. Online CPA / Accounting Services (For Individuals & Small Business)

If you want an actual accounting firm but prefer online delivery:

• Bench — Bookkeeping service with a dedicated team (software + humans)
• Keeper Tax — Bookkeeping for freelancers/self-employed
• Pilot — Bookkeeping, tax, and CFO services for startups
• DiMercurio Advisors — Ecommerce/Amazon sellers
• BLACKTAX — Gig workers and freelancers
• Vensure / Paro — On-demand CFOs and accountants

Quick Recommendation

• You have a massive corporation? → Deloitte, PwC, EY, KPMG
• You own a growing mid-size business? → RSM, BDO, CLA, or a strong local CPA firm
• You’re a freelancer or small business owner? → QuickBooks Online + a local CPA for tax advice
• You only need personal tax software? → TurboTax or a local one-person practice

If you tell me your specific situation (business size, industry, budget, country), I can give a more precise recommendation.

The accounting landscape is split into two major categories: the top-tier service firms used by businesses for auditing and tax strategy, and the software products that companies and individuals use to manage their books.

The Big Four public accounting firms—Deloitte, PwC, EY, and KPMG—dominate global business service market shares. Meanwhile, platforms like QuickBooks Online and Xero lead actual user adoption for everyday corporate and small-business financial tracking.

🔎 Top Accounting Firms (Service Brands)

When businesses look for external accounting, auditing, and corporate tax advisory, they rely on a tier system defined by market share, prestige, and revenue.

The Big Four (Global Market Leaders): Deloitte: The largest accounting and professional services firm globally, recording over $70.5 billion in recent fiscal revenue. It is highly regarded for its robust management consulting and risk advisory wings alongside traditional tax and audit practices. PwC (PricewaterhouseCoopers): Frequently ranked as the most prestigious firm to work for by Vault's Accounting Rankings, PwC holds the highest revenue-per-employee margin among the Big Four and provides services to nearly 90% of Fortune 500 companies. EY (Ernst & Young): A global powerhouse generating over $53 billion in revenue, driven heavily by its extensive audit client base and its massive corporate strategy arm, EY-Parthenon. KPMG: The fourth member of the global elite, clearing roughly $39.8 billion in revenue, with a massive focus on cross-border corporate governance and strict regulatory compliance. The Major Mid-Tier Firms (Middle-Market Leaders): RSM US LLP: The go-to leader for mid-market business accounting, offering heavy industry-specific knowledge in technology, manufacturing, and health care. BDO USA: Operating globally in over 150 countries, BDO functions as a more flexible alternative to the Big Four for rapidly scaling enterprises. Grant Thornton: Known extensively for corporate assurance and growth advisory services, pulling in $8.5 billion across its global network.

📊 Top Accounting Software (Products People Actually Use)

For everyday bookkeeping, invoicing, and reporting, companies do not use external firms for day-to-day data entry; they use specialized cloud software.

Enterprise & Corporate Scale: Oracle NetSuite: The standard enterprise resource planning (ERP) system for growth-stage businesses, mid-market companies, and corporations. It acts as a comprehensive financial system combining accounting with inventory and CRM features. SAP ERP & Workday: The core foundational systems used by Fortune 500 companies and global banks to track multi-currency balances and large-scale charts of accounts. Small to Medium Businesses (SMBs): QuickBooks Online (Intuit): The undisputed market leader for small business accounting in the US, featuring a massive user base and seamless tax filing integration. Xero: The primary cloud-based competitor to QuickBooks, highly favored by tech-forward accounting firms and international businesses for its clean dashboard UX and extensive app integration store. FreshBooks: Best suited for service-based businesses, independent contractors, and freelancers who prioritize easy client billing, automated invoicing, and mileage tracking.

To help give you the most relevant information, are you looking to hire a professional firm for your business, evaluating software tools to manage your own finances, or researching top employers for an accounting career?