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Audit Services in the US Industry Data and Analysis
The Audit Services industry is defined by a culturally significant group of leading auditors, a wide range of clients and strong countercyclical demand. The ‘Big Four' audit companies (PWC, EY, Deloitte and KPMG) generate revenue from industries in almost every economic sector. Auditors in this industry typically audit similarly sized clients, so much of the landscape is made up of non-employing and small companies. Also, unique to this industry, many audit services, including bankruptcy audits and financial statement reviews, are independent of or in opposition to the business cycle. This countercyclical demand helps the industry maintain strong revenue prospects, even during major economic disruptions.Auditing firms have weathered volatility in recent years. Providers faced challenges resulting from the pandemic and recessionary fears, but countercyclical demand ensured revenue growth was positive during these years. Revenue expanded in 2021 and 2022 as a result of rising corporate profit and business formation immediately following the pandemic, but declining government spending hindered auditors’ performance during these years. Long-term revenue growth has led to an expansion of mergers and acquisitions (M&A) and an unprecedented surge in initial public offerings, while regulatory changes have encouraged auditors to update their practices. Overall, revenue for audit service providers is expected to climb at a CAGR of 0.3% to reach $53.7 billion in 2025, although a decline of 1.2% is forecast in 2025.Despite increasing uncertainty for businesses from policy changes, the US economy is expected to continue expanding, with auditors benefiting from strong private investment, a growing number of businesses and higher activity in financial markets, including more M&A activity. Businesses will look to leverage sustainable auditing practices as ESG rules tighten, while the auditing industry itself will see its operations redefined by the increased prevalence of artificial intelligence, automation and cybersecurity. Overall, revenue for auditors in the United States is forecast to expand at a CAGR of 1.1% through 2030 to reach $56.7 billion.
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What's included in this industry analysis
IBISWorld's research coverage on the Audit Services industry in the United States includes market sizing, forecasting, data and analysis from 2015-2030. The most recent publication was released July 2025.
About this industry
What's this industry report about?
The Audit Services industry in the United States operates under the NAICS industry code OD6137. This industry comprises accountants that are certified to audit the accounting records of public and private organizations and to attest to compliance with generally accepted accounting practices. Offices of certified public accountants (CPAs) in this industry include only those that audit financial statements. Related terms covered in the Audit Services industry in the United States include auditing, initial public offering (ipo), international financial reporting standards (ifrs), big four, generally accepted accounting principles (gaap) , mergers and acquisitions and sarbanes-oxley act of 2002.
What's included in this industry?
Products and services covered in Audit Services industry in the United States include Financial auditing for small-sized businesses (0-20 employees), Financial auditing for medium-sized businesses (20-500 employees) and Financial auditing for large-sized businesses (500+ employees).
What companies are included in this industry?
Companies covered in the Audit Services industry in the United States include Deloitte Touche Tohmatsu, EY and Pricewaterhousecoopers Llp.
Performance
What's included in the Performance chapter?
The Performance chapter covers detailed analysis, datasets, detailed current performance, sources of volatility and an outlook with forecasts for the Audit Services industry in the United States.
Questions answered in this chapter include what's driving current industry performance, what influences industry volatility, how do successful businesses overcome volatility, what's driving the industry outlook. This analysis is supported with data and statistics on industry revenues, costs, profits, businesses and employees.
Products & Markets
What's included in the Products and Markets chapter?
The Products and Markets chapter covers detailed products and service segmentation and analysis of major markets for the for the Audit Services industry in the United States.
Questions answered in this chapter include how are the industry's products and services performing, what are innovations in industry products and services, what products or services do successful businesses offer and what's influencing demand from the industry's markets. This includes data and statistics on industry revenues by product and service segmentation and major markets.
Geographic Breakdown
What's included in the Geographic Breakdown chapter?
The Geographic Breakdown chapter covers detailed analysis and datasets on regional performance of the Audit Services industry in the United States.
Questions answered in this chapter include where are industry businesses located and how do businesses use location to their advantage. This includes data and statistics on industry revenues by location.
Competitive Forces
What's included in the Competitive Forces chapter?
The Competitive Forces chapter covers the concentration, barriers to entry and supplier and buyer profiles in the Audit Services industry in the United States. This includes data and statistics on industry market share concentration, barriers to entry, substitute products and buyer & supplier power.
Questions answered in this chapter include what impacts the industry's market share concentration, how do successful businesses handle concentration, what challenges do potential industry entrants face, how can potential entrants overcome barriers to entry, what are substitutes for industry services, how do successful businesses compete with substitutes and what power do buyers and suppliers have over the industry and how do successful businesses manage buyer & supplier power.
Companies
What's included in the Companies chapter?
The Companies chapter covers Key Takeaways, Market Share and Companies in the Audit Services industry in the United States. This includes data and analysis on companies operating in the industry that hold a market share greater than 5%.
Questions answered in this chapter include what companies have a meaningful market share and how each company is performing.
External Environment
What's included in the External Environment chapter?
The External Environment chapter covers Key Takeaways, External Drivers, Regulation & Policy and Assistance in the Audit Services industry in the United States. This includes data and statistics on factors impacting industry revenue such as economic indicators, regulation, policy and assistance programs.
Questions answered in this chapter include what demographic and macroeconomic factors impact the industry, what regulations impact the industry, what assistance is available to this industry.
Financial Benchmarks
What's included in the Financial Benchmarks chapter?
The Financial Benchmarks chapter covers Key Takeaways, Cost Structure, Financial Ratios, Valuation Multiples and Key Ratios in the Audit Services industry in the United States. This includes financial data and statistics on industry performance including key cost inputs, profitability, key financial ratios and enterprise value multiples.
Questions answered in this chapter include what trends impact industry costs and how financial ratios have changed overtime.
Industry Data
What's included in the Industry Data chapter?
The Industry Data chapter includes 10 years of historical data with 5 years of forecast data covering statistics like revenue, industry value add, establishments, enterprises, employment and wages in the Audit Services industry in the United States.
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Frequently Asked Questions
What is the market size of the Audit Services industry in the United States in 2026?
The market size of the Audit Services industry in the United States is $56.3bn in 2026.
How many businesses are there in the Audit Services industry in the United States in 2025?
There are 23,563 businesses in the Audit Services industry in the United States, which has declined at a CAGR of 1.5 % between 2020 and 2025.
How may import tariffs affect the Audit Services industry in the United States?
The Audit Services industry in the United States is unlikely to be materially impacted by import tariffs with imports accounting for a low share of industry revenue.
How may export tariffs affect the Audit Services industry in the United States?
The Audit Services industry in the United States is unlikely to be materially impacted by export tariffs with exports accounting for a low share of industry revenue.
Has the Audit Services industry in the United States grown or declined over the past 5 years?
The market size of the Audit Services industry in the United States has been growing at a CAGR of 1.3 % between 2020 and 2025.
What is the forecast growth of the Audit Services industry in the United States over the next 5 years?
Over the next five years, the Audit Services industry in the United States is expected to grow.
What are the biggest companies in the Audit Services industry in the United States?
The biggest companies operating in the Audit Services industry in the United States are Deloitte Touche Tohmatsu, EY and Pricewaterhousecoopers Llp
What does the Audit Services industry in the United States include?
Auditing services and Specialized auditing services are part of the Audit Services industry in the United States.
Which companies have the highest market share in the Audit Services industry in the United States?
The company holding the most market share in the Audit Services industry in the United States is Deloitte Touche Tohmatsu.
How competitive is the Audit Services industry in the United States?
The level of competition is high and steady in the Audit Services industry in the United States.
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