Public company audits remain heavily concentrated, with Big Four firms holding 98% of the global audit market in 2023 while PCAOB inspections still found deficiencies in 40% of audits. At the same time, audit work is getting more demanding, with Fortune 500 audit teams averaging 25,000 hours and integrated audit demand rising 15% after the latest post 2023 regulatory push. This mix of scale, scrutiny, and oversight is exactly where the most telling trends in public accounting emerge.
Key Takeaways
- Global public company audits conducted by Big Four: 98% market share in 2023
- U.S. public companies changing auditors: 4.2% rate in 2023
- Average audit hours for Fortune 500 firms: 25,000 in 2023
- U.S. CPA firms employment totaled 1.4 million in 2023
- Big Four employed over 1.2 million people globally in 2023
- Women comprise 62% of public accounting workforce in U.S. entry-level positions
- The global public accounting services market was valued at approximately $642 billion in 2022
- U.S. public accounting industry revenue reached $179.5 billion in 2023
- The Big Four accounting firms collectively generated over $212 billion in global revenue in 2022
- Deloitte global revenue from consulting services was $23.1 billion in FY2023
- PwC audit revenue grew 9% to $19.2 billion in FY2023
- EY advisory services revenue $22.1 billion in FY2023
- U.S. tax compliance services revenue $35 billion in 2023
- Corporate tax advisory grew 18% for Big Four in 2023
- Transfer pricing engagements: 5,000+ by Deloitte in 2023
In 2023, Big Four dominance persisted, with frequent PCAOB deficiencies driving higher audit scrutiny and costs.
Related reading
01 · Category
Audit and Assurance18 stats
01
Global public company audits conducted by Big Four: 98% market share in 2023
02
U.S. public companies changing auditors: 4.2% rate in 2023
03
Average audit hours for Fortune 500 firms: 25,000 in 2023
04
PCAOB inspections found deficiencies in 40% of audits in 2023
05
SOX 404 audit costs averaged $1.5 million per issuer in 2023
06
Big Four audit market concentration: 95% for largest clients in 2023
07
Integrated audits grew 15% in demand post-2023 regulations
08
Audit quality scores: Deloitte 92/100 in PCAOB 2023 review
09
PwC audit remediation rate 85% for 2023 deficiencies
10
EY global audits: 12,000 public company audits in 2023
11
KPMG audit backlog reduced by 20% in 2023 initiatives
12
Non-audit services banned in 25% of PCAOB cases in 2023
13
Crypto asset audits: 150 engagements in 2023 by major firms
14
Audit committee oversight meetings averaged 9 per year in 2023
15
Revenue recognition audits: 30% increase in scrutiny 2023
16
Internal audit outsourcing: 60% of public firms in 2023
17
PCAOB fines for audit failures totaled $100 million in 2023
18
Sustainability assurance standards adopted by 70% of audits in 2023 EU
Interpretation
Audit and Assurance Interpretation
While the audit industry boasts of near-total market control and impressive internal metrics, the persistent high deficiency rates and million-dollar price tags suggest we're paying for an expensive, monopolistic assurance whose quality remains stubbornly, and concerningly, human.
02 · Category
Employment Statistics18 stats
01
U.S. CPA firms employment totaled 1.4 million in 2023
02
Big Four employed over 1.2 million people globally in 2023
03
Women comprise 62% of public accounting workforce in U.S. entry-level positions
04
Average U.S. CPA salary was $134,000in 2023
05
75,000 new CPAs licensed in U.S. annually as of 2023
06
Public accounting turnover rate averaged 19% in 2023 U.S. firms
07
45% of public accountants in U.S. are millennials in 2023
08
Global accounting talent shortage affects 80% of firms in 2023 survey
09
U.S. public accounting added 50,000 jobs in 2023
10
Diversity: 22% of partners in U.S. CPA firms are women in 2023
11
Remote work adopted by 70% of public accounting firms post-2023
12
Median tenure for public accountants is 4.2 years in U.S.
13
15% increase in accounting internships offered in 2023
14
PwC hired 20,000 new graduates globally in 2023
15
EY workforce diversity: 50% non-white employees in 2023
16
KPMG U.S. staff count reached 36,000 in 2023
17
Deloitte U.S. professionals total 120,000 in 2023
18
Public accounting age demographics: 40% under 35 in 2023
Interpretation
Employment Statistics Interpretation
Despite a talent shortage, a high salary, and a flood of new graduates, the public accounting industry still manages to burn through nearly a fifth of its workforce each year, proving that even a six-figure paycheck can't always compete with the siren call of a better work-life balance and a partnership track that moves at a glacial pace.
03 · Category
Market Size and Growth20 stats
01
The global public accounting services market was valued at approximately $642 billion in 2022
02
U.S. public accounting industry revenue reached $179.5 billion in 2023
03
The Big Four accounting firms collectively generated over $212 billion in global revenue in 2022
04
Public accounting market in North America grew by 5.2% CAGR from 2018-2023
05
Asia-Pacific public accounting sector expected to grow at 7.1% CAGR through 2030
06
U.S. accounting firms numbered over 46,000 in 2023
07
Global forensic accounting market within public accounting projected to reach $10.2 billion by 2027
08
European public accounting revenue hit €250 billion in 2022
09
Cloud accounting software adoption drove 4.8% market expansion in 2023
10
U.S. small business accounting services segment valued at $45 billion in 2023
11
Deloitte's global revenue from audit and assurance was $29.3 billion in FY2023
12
PwC worldwide revenue grew 12% to $53.1 billion in FY2023
13
EY global revenue reached $49.9 billion in FY2023, up 11.3%
14
KPMG international revenue hit $36.8 billion in FY2023
15
Public accounting M&A deals in U.S. totaled 104 in 2023
16
Indian public accounting market size estimated at $15 billion in 2023
17
UK accounting services market valued at £38 billion in 2022
18
Brazilian public accounting sector revenue exceeded R$100 billion in 2022
19
Australian accounting industry generated AUD 25 billion in 2023
20
Public accounting digital transformation market to grow 15% annually to 2028
Interpretation
Market Size and Growth Interpretation
Despite generating mountain ranges of revenue, the global public accounting industry is ultimately a story of trusted gatekeepers counting other people's money while frantically racing to digitize and consolidate before anyone notices the irony.
More related reading
04 · Category
Revenue and Profitability20 stats
01
Deloitte global revenue from consulting services was $23.1 billion in FY2023
02
PwC audit revenue grew 9% to $19.2 billion in FY2023
03
EY advisory services revenue $22.1 billion in FY2023
04
KPMG tax services revenue $10.8 billion globally in FY2023
05
U.S. Big Four firms average profit per partner $1.2 million in 2023
06
Top 100 U.S. CPA firms revenue totaled $59.4 billion in 2023
07
Average U.S. CPA firm profitability margin 15.2% in 2023
08
PwC profit share per partner averaged $1.3 million in 2023
09
Deloitte U.S. revenue $27.4 billion in FY2023
10
EY U.S. revenue growth 12.4% to $16.5 billion in 2023
11
KPMG international profit $3.7 billion in FY2023
12
U.S. mid-tier firms revenue up 8.7% in 2023
13
Global assurance services revenue $150 billion in 2022
14
Tax preparation services revenue $12.5 billion in U.S. 2023
15
Consulting revenue share in Big Four rose to 45% in 2023
16
Average small CPA firm revenue $1.2 million in 2023
17
Forensic accounting billings averaged $450/hour in U.S. 2023
18
Public company audit fees averaged $2.1 million per client in 2023
19
ESG advisory revenue doubled to $5 billion for Big Four in 2023
20
U.S. PCAOB registered firms audit fees up 6% in 2023
Interpretation
Revenue and Profitability Interpretation
The firms have masterfully pivoted from their bean-counting roots, proving it's more lucrative to sell answers for the future than merely certify the past, as evidenced by consulting now commanding nearly half their revenue while audit fees still reliably climb.
05 · Category
Tax and Advisory Services19 stats
01
U.S. tax compliance services revenue $35 billion in 2023
02
Corporate tax advisory grew 18% for Big Four in 2023
03
Transfer pricing engagements: 5,000+ by Deloitte in 2023
04
R&D tax credit claims processed: $50 billion in U.S. 2023
05
ESG tax advisory services up 300% since 2020 to 2023
06
International tax compliance complexity index: 7.2/10 in 2023
07
VAT/GST advisory market $20 billion globally 2023
08
U.S. individual tax returns prepared by CPAs: 25 million in 2023
09
M&A tax due diligence: 40% of deals in 2023
10
Crypto tax reporting tools adopted by 55% of firms 2023
11
State and local tax services revenue $8 billion U.S. 2023
12
Tax controversy resolutions: 12,000 cases by Big Four 2023
13
Advisory services billable hours averaged 1,800 per consultant 2023
14
Digital tax transformation projects: 2,500 by PwC in 2023
15
BEPS 2.0 impact advisory: 80% of multinationals engaged 2023
16
Risk advisory revenue $15 billion for EY globally 2023
17
Management consulting within accounting firms: $100 billion market 2023
18
Forensic tax investigations: 1,200 cases U.S. 2023
19
Advisory services growth outpaced audit by 2x in 2023 Big Four
Interpretation
Tax and Advisory Services Interpretation
The tax world has become a labyrinth so complex and lucrative that the guardians of the ledger now make more money guiding you through the minefield than they do simply checking the map.
Reference
Cite This Report
This report is designed to be cited. We maintain stable URLs and versioned verification dates. Copy the format appropriate for your publication below.
APA
Helena Kowalczyk. (2026, February 13). Public Accounting Industry Statistics. Gitnux. https://gitnux.org/public-accounting-industry-statistics
MLA
Helena Kowalczyk. "Public Accounting Industry Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/public-accounting-industry-statistics.
Chicago
Helena Kowalczyk. 2026. "Public Accounting Industry Statistics." Gitnux. https://gitnux.org/public-accounting-industry-statistics.
Sources & references
38 datasets cited across this report · attribution is report-level