Two signals dominate the conversation. Revenue shows scale and market reach. Reputation reflects trust, technical skill and stakeholder confidence. Neither one alone tells you who the best provider is.
This article ranks five leading US firms using the 2026 Accounting Today ranking for scale, then checks each against independent reputation evidence. Rankings shift as firms report new results. This list reflects research as of 12 November 2026.
Key Takeaways
- The ranking follows the 2026 Accounting Today order, with reported revenue as the scale signal.
- Deloitte, PwC, EY and KPMG form the Big Four; RSM is the middle-market alternative.
- Revenue and brand recognition don't guarantee the best fit for your business.
- Compare industry expertise, partner access, technology and total cost before signing.
Overview of Accounting Firms in the US Market
Major firms sell far more than audits. Typical service lines include:
- Audit and assurance
- Tax planning and compliance
- Transaction support and due diligence
- Risk management and cybersecurity
- Consulting and financial advisory
- Outsourced accounting
An audit gives reasonable assurance that financial statements are free of material misstatement, then states an opinion on fair presentation. Assurance is broader, covering financial and non-financial reporting and controls.
Why revenue figures don't line up
Revenue is the messiest part of any ranking. Firms report on different bases, and the published figures aren't interchangeable:
- Net vs. gross: Accounting Today generally ranks on net revenue, but marks Big Four figures as gross.
- US vs. global: Each Big Four firm belongs to a global network of legally separate member firms. Network revenue isn't US revenue.
- Different fiscal years: Year-ends range from May to September.
So this article uses US-specific figures only, labels each one, and doesn't convert them into a false common series.
Big Four vs. middle market
Scale helps with multinational, heavily regulated or complex engagements. Middle-market firms often give smaller companies closer partner access. The firms below are ordered by the 2026 Accounting Today ranking, then assessed on reputation, service breadth and client fit.
Top US Accounting Firms Ranked by Revenue and Reputation
Selection criteria: latest verifiable US revenue, consistent reporting definitions, client-service reputation, technical credibility, service breadth, industry coverage and market presence. The Accounting Today ranking comes from its 2026 Top 100 edition.
This list is editorial. It is not an official certification or endorsement.
1. Deloitte LLP
Deloitte ranks first in the 2026 Accounting Today list. Its official facts page reports $35.7B in US revenues for Deloitte LLP and subsidiaries, for the fiscal year ended 31 May 2025. The page doesn't label that figure net.
It offers audit and assurance, tax, consulting, cyber, and finance and technology transformation. Industry coverage spans consumer, energy and industrials, financial services, government, life sciences and health care, and technology, media and telecom.
Snapshot
| Item | Detail |
|---|---|
| Latest US revenue | $35.7B, FY ended 31 May 2025 |
| PCAOB Part I.A findings | 3 of 64 audits inspected |
| Vault peer prestige | 2nd |
| Best fit | Multinational, public, highly regulated or transformation-heavy clients |
2. PricewaterhouseCoopers (PwC)
PwC ranks second. Its FY2026 transparency report, published 30 October 2026, shows $26,413M in US firm gross revenue for the year ended 30 June 2026.
Services cover assurance, tax, deals, consulting, and governance, sustainability and risk offerings. PwC describes financial due diligence that looks at quality of earnings, net working capital and cash-flow drivers. In mid-2025 it also reorganized US advisory from four platforms to eight.
PCAOB found Part I.A deficiencies in 6 of 64 audits inspected. Vault, which measures peer prestige among accounting professionals rather than client satisfaction, puts PwC first.
Snapshot
| Item | Detail |
|---|---|
| Latest US revenue | $26,413M gross, FY ended 30 June 2026 |
| PCAOB Part I.A findings | 6 of 64 |
| Vault peer prestige | 1st |
| Best fit | Complex deals and structured, multi-service engagements that justify a premium |
3. Ernst & Young (EY)
EY ranks third. Its 2026 transparency report shows $23,009.3M for the year ended 3 July 2026 (not 30 June). That figure includes fees and expenses billed to clients plus billings to other EY member firms, and isn't labeled net.
EY covers assurance, consulting, tax, and strategy and transactions. It suits high-growth companies, businesses entering new markets, private equity-backed organizations and companies preparing for deals or tougher reporting.
PCAOB found deficiencies in 3 of 64 audits inspected. Vault ranks EY third.
One piece of history to weigh: in June 2022 the SEC announced a $100M penalty against EY over cheating on CPA ethics exams. That's a past enforcement event, not a current inspection result.
Snapshot
| Item | Detail |
|---|---|
| Latest US revenue | $23,009.3M, FY ended 3 July 2026 |
| PCAOB Part I.A findings | 3 of 64 |
| Vault peer prestige | 3rd |
| Best fit | Growth companies, PE-backed businesses, cross-border expansion |
4. KPMG LLP
KPMG ranks fourth. Its FY2025 transparency report covers the year ended 30 September 2025. A US-only net revenue figure for a named fiscal year is unconfirmed in that disclosure, so a global total is not used as a substitute.
Services include audit, tax and advisory, with industry groups in asset management, banking and capital markets, consumer and retail, energy and chemicals, health care and life sciences, and industrial manufacturing.
PCAOB found deficiencies in 8 of 64 audits inspected, the highest count among these five firms in that sample. Inspection samples aren't representative, so don't read that as a failure rate. Vault ranks KPMG fourth.
Snapshot
| Item | Detail |
|---|---|
| Latest US revenue | Unconfirmed for a named fiscal year |
| PCAOB Part I.A findings | 8 of 64 |
| Vault peer prestige | 4th |
| Best fit | Regulated-industry clients that want a risk and governance emphasis |
5. RSM US LLP
RSM ranks fifth in the 2026 list. Its FY2026 headline of $5.0B combines the US, Canada, UK and Ireland, with different reporting dates (30 April 2026 for the US and Canada, 31 March 2026 for the UK and Ireland). It is not a US-only number. The transatlantic partnership took effect 1 January 2026, and the firms remain separate legal entities.
RSM positions itself as a middle-market leader in assurance, tax and consulting. Its industry focus includes asset management, automotive, health care, manufacturing, retail and technology.
PCAOB found deficiencies in 3 of 17 audits inspected. Vault ranks RSM sixth.
Snapshot
| Item | Detail |
|---|---|
| Latest US revenue | US-only figure not stated; $5.0B is a four-country aggregate |
| PCAOB Part I.A findings | 3 of 17 |
| Vault peer prestige | 6th |
| Best fit | Growing mid-sized companies adding entities or preparing for a transaction |
How We Chose the Best Accounting Firms
We started with the 2026 Accounting Today ranking, then tested each firm against separate reputation sources. Common mistakes to avoid:
- Treating a ranking as a guarantee of service quality
- Comparing global revenue with US revenue
- Choosing a firm purely on brand recognition
Revenue and scale
Revenue is the primary scale input, with the reporting year and fiscal year-end stated wherever they were available. Net, gross and billings-based labels differ across firms.
Two structural changes also affect comparisons: RSM's transatlantic aggregation and PwC's advisory reorganization. EY's 2025 regional consolidation was a global network change, not a US merger.
Reputation and credibility
Three evidence types appear here, and they measure different things:
- PCAOB inspections: a look at selected issuer audits. The PCAOB's own guidance warns that results aren't necessarily comparable between firms or over time.
- Vault rankings: peer prestige among accounting professionals, which reflects the employment market, not client satisfaction. See Vault's prestige list.
- Enforcement history: dated events such as EY's 2022 settlement.
Employer and career rankings stay separate from client-service reputation. No single source here gives an overall "best firm" score.
Client fit and service capability
Compare firms on the factors that shape day-to-day results:
- Industry specialization
- Audit and tax depth
- Advisory strength and technology
- Cross-border support and partner involvement
- Ability to serve you at your growth stage
These drive reporting confidence, compliance readiness, deal execution, responsiveness and total cost.
Limitations and update policy
Revenue and reputation change over time, sources use different reporting periods, and a high ranking is not an endorsement. Research date: November 12, 2026. This list is updated when firms release new revenue figures or major reputation evidence changes.
Conclusion
The biggest US accounting firm isn't automatically the right one. Match the firm's expertise, communication model, technology and fees to your goals.
Before signing, compare:
- Who actually staffs your engagement, and how much partner time you get
- Industry experience relevant to your business
- Service scope and room to scale
- Data-security practices
- Response-time expectations
- Total cost, including add-on fees
If your US business also has operations in India, look beyond the ranked firms for India-specific support. VJM Global is not one of the firms above. It helps foreign companies, including US businesses, with India-focused business setup, accounting, audit, tax compliance and back-office services.
VJM Global reports serving 500+ American business owners and a 95% client retention rate. Confirm those figures with the company directly.
Frequently Asked Questions
What are the "Big" accounting firm groupings (Big 4, Big 8, Big 10)?
The Big Four are Deloitte, PwC, EY and KPMG. The Big Eight is a historical grouping that consolidated through mergers in 1987 to 2002. "Big Ten" is an informal label, not an official classification, and needs a named ranking to mean anything.
How are the top US accounting firms ranked by revenue?
Rankings use firm-reported revenue, ideally US-only and net, for a stated fiscal year. Big Four figures are often reported gross. Always check the edition, reporting period and source definition before comparing.
Which firms are part of the Big Four in the US?
Deloitte, PwC, EY and KPMG. Each also operates within a global network of legally separate member firms, so US revenue should never be swapped for global revenue.
Is the accounting firm with the highest revenue always the best choice?
No. Scale brings resources and reach, but industry expertise, partner access, responsiveness, complexity and budget may favor another firm.
What services do the largest US accounting firms provide?
Audit and assurance, tax, transaction advisory, consulting, risk and compliance, technology services, and in some cases outsourced accounting and financial advisory.
How should a company choose between a Big Four and a middle-market accounting firm?
Big Four firms offer global reach and deep specialist benches, which suit complex or regulated work. Middle-market firms often offer more partner access, sector focus and flexibility, usually with a simpler engagement.
