In 2024, Deloitte was the largest accounting firm in the United States with a revenue of 33 billion U.S. dollars. Leading accounting firms - additional information Deloitte was the third largest tax firm in the United States in 2023 behind PwC and Ernst & Young. Worldwide, the company generated a revenue of roughly 67 billion U.S. dollars in 2024. When broken down by region, the largest source of revenue for Deloitte came from the Americas. The number of employees at Deloitte totaled 460,000 people in the same year. Accounting services in the United States The number of accountants and auditors in the United States has remained steady between 1.3 and 1.5 million people over the last several years. In 2024, there were 1.4 million people employed in these professions. Although the sector is expected to flourish in terms of numbers, there has been a considerable gender wage gap within the accounting and auditing industry. In 2021, men earned around 230 U.S. dollars more per week than women doing the same job.

With a total revenue of over 67 billion U.S. dollars, Deloitte was the largest of the Big Four accounting firms in 2024. The combined revenue of the firms increased steadily in the last decade and exceeded 212 billion U.S. dollars in 2024. The Big Four accounting firms The leading accounting firms in the world are Deloitte, PricewaterhouseCoopers (PwC), Ernst & Young (EY), and Klynveld Peat Marwick Goerdeler (KPMG). The firms provide their clients with various professional services that include auditing, corporate finance, and legal advice. Consulting revenue accounted for around 40 percent of Deloitte’s record total in 2024, whereas PwC and EY received most of their revenue from auditing services. International firms with workforces to match When broken down by geographical region, the three biggest firms generated most of their revenue in the Americas region – KPMG’s most lucrative region was its network of firms in Europe, the Middle East, and Africa (including India). The United States has remained a major market for all four firms, where Deloitte generated nearly half of its total revenue in 2024. In terms of the number of employees, the four firms had a combined global workforce of more than one million people, as Deloitte once again led the way in 2024.

Deloitte generated the largest revenue of the Big Four accounting firms in the United States in 2024, earning approximately 10 billion U.S dollars more than their nearest competitor, PricewaterhouseCoopers (PwC). The ranking mirrored the revenue of the Big Four firms worldwide, as Deloitte and PwC again competed for the top two positions. Deloitte’s operations in the Americas Deloitte reported revenue figures of over 36 billion U.S dollars for the Americas region in 2024, of which approximately 33 billion U.S. dollars came from the United States. In recent years, the performance of Deloitte in the United States improved, with its revenue increasing steadily since 2010. The growing number of employees at Deloitte provides another indication of the firm’s stature throughout North and South America. Deloitte employed roughly 216,000 staff members across the Americas in 2024, the highest number among the leading accounting firms in the United States. The Big Eight of the Eighties There are 4 major accounting firms in the world today: Deloitte, PricewaterhouseCoopers (PwC), Ernst and Young (EY), and Klynveld Peat Marwick Goerdeler (KPMG). However, the professional accounting landscape was far different for much of the 20th century, with 8 firms competing for the same major clients. The growth of multinational clients in a global economy changed the industry during the 1980s. In order to gain a strong foothold in the new international market, 2 mega mergers took place in 1989 that involved 4 of the Big Eight firms: Ernst and Whinney merged with Arthur Young to form Ernst and Young, and Deloitte Haskins and Sells merged with Touche Ross to form Deloitte and Touche. This was the start of the Big Eight gradually being reduced to the Big Four.

The combined global revenue of the Big Four accounting firms reached over 212 billion U.S. dollars in 2024, a significant increase when compared to the previous year. The roughly nine billion U.S. dollar increase between 2023 and 2024 was noteable, however 2022 was the biggest year-on-year growth ever recorded for the Big Four, with an increase in the region of 22 billion U.S. dollars when compared to 2021. Who are the Big Four? The four biggest accounting firms worldwide – also known as audit firms or professional services networks – are Deloitte, PwC, EY, and KPMG. The Big Four hold a dominant share of the industry, but out of the four it was Deloitte that was ranked the leading accounting firm worldwide in 2024, as they generated 67 billion U.S. dollars in revenue. Deloitte was also ranked the leading accounting firm in the United States in 2023, with revenue figures of around 33 billion U.S. dollars. A guide to accounting firms The accountancy profession is part of the tertiary sector of the economy, which focuses solely on providing services to customers; being an accountant requires specialist knowledge and professional experience. There are many different disciplines to the service ranging from simple consultancy to more complex legal issues, but the main focus is to produce detailed financial statements that determine the financial position of a company. Independent firms with strengths in the different branches of accounting have come together under a single brand name – such as Deloitte or PwC – to create professional services networks that can cost-effectively meet the needs of clients.

Accounting and audit firms in France benefit from a steady demand for services as businesses from all sectors of the economy seek their expertise to remain compliant with the increasingly complex financial environment and the requirement for many French businesses to have their financial accounts audited. The Big Four accounting firms (EY, Deloitte, PwC and KPMG) boast a solid share of the market and audit the majority of France’s largest businesses, while Mazars, BDO France and Grant Thornton are also well-established and focus on mid-sized businesses. Revenue is expected to climb at a compound annual rate of 1.7% over the five years through 2025, including a 1.4% hike in 2025 to €25.5 billion.Wider economic conditions impact demand for accounting and auditing services, with a positive market climate driving business activity and corporate transactions. Meanwhile, demand for countercyclical services, including insolvency work and advice on cost-cutting and restructuring, support revenue during periods of economic uncertainty. Accounting firms face stiff competition not just from each other but also from software solutions that enable individuals and small businesses to manage their own finances. The EU Statutory Audit Reform, in place since June 2016, has introduced mandatory audit firm rotation and restricted non-audit services, aiming to enhance competition. Heightened economic uncertainty amid the COVID-19 pandemic and severe inflationary pressures weighed on business spending and dealmaking, hindering revenue. Improving economic conditions thanks to lower inflation and interest rates support business expansionary activities, IPOs and mergers and acquisitions, driving revenue growth in 2024 and into 2025.Revenue is forecast to expand at a compound annual rate of 3.1% over the five years through 2030 to reach €29.7 billion. Anticipated growth in business sentiment and corporate transactions will aid demand for accounting and auditing services. An expanding number of businesses in France will expand the client base for accounting and auditing firms. Growing regulatory complexities and emphasis on sustainability will push businesses to seek expert guidance from accountants. Lucrative opportunities will drive some firms to expand their consulting operations, hiking their non-audit revenue share. Firms will also increasingly invest in integrating technology like AI and cloud-based solutions to improve efficiency and offer more valuable insights, enhancing client services.

Europe’s Accounting and Auditing industry is well-established, with leading nations like the UK and Germany generating significant revenue, partly because London and Frankfurt are major global financial hubs. Growing enterprise numbers and employment rates have expanded the potential client pool for accounting and auditing firms. Despite the industry providing both procyclical and countercyclical services, volatile economic conditions have caused some operational disruption, though revenue has remained fairly resilient. Revenue is expected to inch upward at a compound annual rate of 0.4% over the five years through 2025 to €235 billion, including a forecast hike of 0.6% in 2025. Audit failings and poor service quality have led to enhanced regulations – most notably the introduction of the EU Audit Reform in 2016, aimed at enhancing standards and promoting competition. The reform forces large companies to change auditors every 20 years, diversifying the market by pushing more companies to use firms other than the Big Four. The industry has also come up against challenges from economic headwinds, including the COVID-19 pandemic, inflationary pressures and geopolitical tensions, which have sustained economic uncertainty and subdued business spending and deal-making activity. The industry has been subject to intense consolidation activity, particularly in the UK, where private equity influx has driven acquisitions. Strong competition and higher operational costs have forced firms to raise fees to protect revenue and profitability. Improving economic conditions will bolster business sentiment and investment and drive up M&A activity, fuelling demand for accounting, audit and tax consulting services. Revenue is forecast to expand at a compound annual rate of 4.4% over the five years through 2030 to €291.8 billion. Heightened business investment and M&A activity amid anticipated improvement in economic conditions, alongside a rising number of enterprises in Europe and solid employment rates, will fuel demand for accounting, audit and tax consulting services. Companies will also have to navigate mounting digitalisation, with AI and automated solutions helping to reduce costs and free up time for the provision of value-added services, but at the same time, advanced software enabling small businesses and individuals to carry out their own accounting and tax tasks, eating away at demand. The evolving regulatory environment for businesses, including sustainability reporting and tax reforms, will boost demand and create strong revenue stream opportunities for auditing and tax consulting firms. These specialised services also stand to support profit as more complex audits and regulations will drive firms to hike their fees.

The industry offers a wide range of services to companies in all sectors of the economy, including audit, assurance, tax and compliance. Its total turnover has grown by an average of 0.9% annually since 2019, with the sector benefiting from the expansion of corporate investment and extensive M&A activities. The entry of new companies into the industry has intensified internal competition. In order to increase their market share, the largest auditing firms (audit firms) have increasingly acquired smaller companies and expanded their offering with additional consulting services through strategic acquisitions. In 2024, industry turnover is expected to increase by 0.7% to 45.1 billion euros.In the last five years, the major auditing firms have increasingly expanded their range of services to include advisory services. These additional services include, in particular, the assessment of regulatory risks and financial uncertainties. Digitalisation and the use of big data analyses play an important role in increasing efficiency and reducing errors. However, it is primarily large companies that benefit from these technological developments, while smaller companies suffer a competitive disadvantage as a result. In response to the Wirecard scandal and the associated loss of trust, regulation for auditors was tightened in order to improve balance sheet control and achieve a greater separation between auditing and consulting business.In the next five years, industry revenues are expected to increase at an average annual rate of 0.6%, reaching 46.6 billion euros in 2029. IBISWorld expects the industry to develop positively due to increasing private investment, rising corporate numbers and higher activity in the financial markets, including an increase in M&A activity. The increasingly stringent regulations on sustainability reporting should also have a positive impact on the development of the industry. The larger audit firms will continue to expand their consulting business against the backdrop of higher expected profit margins, while many small and medium-sized enterprises (SMEs) will tend to offer more niche services. Although competition is likely to increase, especially in the consumer segment, due to low-cost online alternatives for accounting or tax preparation, this should not significantly hamper growth in the sector.

Deloitte reported total revenue figures of around 67 billion U.S. dollars in 2024, the highest among the Big Four accounting firms. The company also led the rankings in the Americas, but it was PwC who came out on top in the EMEA region (Europe, the Middle East, and Africa). Accounting around the world Deloitte generated 36.4 billion U.S. dollars in North and South America in 2024, which was slightly more than half of their revenue worldwide. A similar story was reported by PwC, with almost half of their aggregated worldwide revenue in 2024 being made in the regions of the Asia Pacific and EMEA. PwC experienced particularly strong growth in EMEA where aggregate revenues in the region increased in recent years. Who are the Big Four? The four biggest accounting firms worldwide are Deloitte, PricewaterhouseCoopers (PwC), Ernst and Young (EY), and Klynveld Peat Marwick Goerdeler (KPMG). Known as the Big Four, the companies have a significant oligopoly in the accounting market and generated a combined revenue worldwide of over 212 billion U.S. dollars and employed over one million people globally in 2024. Until 1989, the market had been dominated by eight accounting firms – also known as audit firms or professional services networks – but the number has since halved due to mergers and the collapse of major American accounting firm Arthur Andersen.

In 2024, Deloitte roughly 21 billion U.S. dollars in revenue from its assurance segment, making it the leader in the assurance market among the Big Four. The Big Four worldwide The Big Four consist of PricewaterhouseCoopers (PwC), Deloitte, Ernst & Young (EY), and KPMG. These companies are the four largest accounting and audit firms worldwide. In 2024, they brought in more than 212 billion U.S. dollars in global combined revenue. Out of the four, Deloitte had the highest number of employees. Second in the list was Ernst & Young, followed by PwC, and KPMG. The majority of revenue generated by Deloitte came from the Americas region, as was the case with PwC and EY. The Big Four in the U.S. These four companies have the most influence in the accounting and audit sector in the United States, auditing over 80 percent of U.S. public companies. Out of the Big Four, Deloitte brought in the highest gross revenue in the United States. Following Deloitte was PwC, bringing in 22.75 billion U.S. dollars, then Ernst & Young, that brought in 21.46 billion U.S. dollars. KPMG brought in the least, generating 12.2 billion U.S. dollars the same year.

A. SUMMARY This dataset was created to support local nonprofit organizations seeking qualified and available auditors to perform their auditing work timely. Included in this dataset are accounting firm details on: The budget size of nonprofits the firms are interested in working with Whether the firms have prior nonprofit auditing experience The firms' ability to work on-site in San Francisco The firms' ability to perform Single Audits for nonprofits receiving Federal funding Additional types of services the firms provide in addition to auditing B. HOW THE DATASET IS CREATED The Controller’s Office surveyed over 400 local, state, and national accounting firms to develop this dataset, asking surveyed firms to provide details on their interest and history with conducting nonprofit financial audits. This dataset reflects verbatim the most recent survey responses; firms may not have answered all questions. C. UPDATE PROCESS The Controller's Office provides a live link to allow firms to submit new or updated data at any time. Approximately twice annually, the Controller's Office will refresh the posted dataset with new results submitted in the prior period. D. HOW TO USE THIS DATASET Use this dataset to find accounting firms that meet your organization's needs. Please note nonprofit organizations are strongly encouraged to do further outreach and perform additional review of qualifications to confirm firms’ nonprofit auditing expertise and capacity. Nonprofit organizations are also encouraged to do additional research to identify accounting firms best suited for their organization’s needs. E. RELATED DATASETS Not applicable.

Europe’s Accounting and Auditing industry is well-established, with leading nations like the UK and Germany generating significant revenue, partly because London and Frankfurt are major global financial hubs. Growing enterprise numbers and employment rates have expanded the potential client pool for accounting and auditing firms. Despite the industry providing both procyclical and countercyclical services, volatile economic conditions have caused some operational disruption, though revenue has remained fairly resilient. Revenue is expected to inch upward at a compound annual rate of 0.4% over the five years through 2025 to €235 billion, including a forecast hike of 0.6% in 2025. Audit failings and poor service quality have led to enhanced regulations – most notably the introduction of the EU Audit Reform in 2016, aimed at enhancing standards and promoting competition. The reform forces large companies to change auditors every 20 years, diversifying the market by pushing more companies to use firms other than the Big Four. The industry has also come up against challenges from economic headwinds, including the COVID-19 pandemic, inflationary pressures and geopolitical tensions, which have sustained economic uncertainty and subdued business spending and deal-making activity. The industry has been subject to intense consolidation activity, particularly in the UK, where private equity influx has driven acquisitions. Strong competition and higher operational costs have forced firms to raise fees to protect revenue and profitability. Improving economic conditions will bolster business sentiment and investment and drive up M&A activity, fuelling demand for accounting, audit and tax consulting services. Revenue is forecast to expand at a compound annual rate of 4.4% over the five years through 2030 to €291.8 billion. Heightened business investment and M&A activity amid anticipated improvement in economic conditions, alongside a rising number of enterprises in Europe and solid employment rates, will fuel demand for accounting, audit and tax consulting services. Companies will also have to navigate mounting digitalisation, with AI and automated solutions helping to reduce costs and free up time for the provision of value-added services, but at the same time, advanced software enabling small businesses and individuals to carry out their own accounting and tax tasks, eating away at demand. The evolving regulatory environment for businesses, including sustainability reporting and tax reforms, will boost demand and create strong revenue stream opportunities for auditing and tax consulting firms. These specialised services also stand to support profit as more complex audits and regulations will drive firms to hike their fees.

Unsurprisingly the Big Four accounting firms – Deloitte, PwC, EY and KPMG – maintained the largest workforces of the accounting firms in the United States in 2024, ranging from Deloitte with approximately ******* employees to KPMG with their workforce of roughly ******. Outside of the Big Four there is a significant drop to the next-largest U.S. accounting firm, RSM, who employed ****** U.S. staff. Accounting firm structure Most accounting firms divide their employees into partners, professional staff and administrative staff. Partners sit atop the hierarchy, and can be either equity partners or salaried partners. Equity partners do not receive a fixed salary, instead owning part of the business. This entitles them to a proportion of the distributable profits. Conversely, salaried partners receive a fixed remuneration like other employees, but are often entitled to bonuses based on the firm’s profitability. Next in the hierarchy are professional staff, who are qualified to provide the specific services offered by the firm (for example, accountancy services or taxation advice). Finally there are administrative staff, who provide support to professional staff and partners. Generally the majority of employees are professional staff. In 2023, for example, Deloitte comprised of roughly ** percent professionals. The Big Four versus the rest The distance between the Big Four accounting firms and the others is also reflected in revenue figures , where the gap is even greater than for employee numbers. However, this gap can sometimes mask the size and success of the smaller accountancy firms. RSM reported a global revenue of 9.4 billion U.S. dollars in 2023, and have grown consistently for each of the last six years. Similarly, BDO reported a global revenue of ** billion U.S. dollars in 2023, following a period of consistent growth.

This dataset provides in-depth insights into financial risk assessment, compliance violations, and fraud detection trends in the Big 4 consulting firms – Ernst & Young (EY), PwC, Deloitte, and KPMG – from 2020 to 2025. It captures key metrics such as the number of audit engagements, high-risk cases, fraud cases detected, and compliance breaches. Additionally, it explores the impact of AI in auditing, employee workload, and client satisfaction scores.

This dataset is valuable for financial analysts, auditors, data scientists, and risk managers who want to analyze trends in financial compliance, audit effectiveness, and corporate risk.

Why This Dataset? 🔥

✅ Unique & High-Value – Focuses on Big 4 consulting firms, making it highly relevant for finance professionals.

✅ AI in Auditing – Explores how AI is impacting risk detection and compliance.

✅ Industry Comparison – Allows analysis across different sectors (Finance, Tech, Retail, Healthcare).

✅ Workload vs. Effectiveness – Helps in understanding auditor workload and its impact on compliance quality.

📌 Perfect for: Financial analysts, auditors, risk managers, data scientists, and AI researchers in finance!

The global Accounting Firms Services market is experiencing robust growth, driven by the increasing complexity of business regulations, the expanding adoption of cloud-based accounting software, and the rising demand for specialized accounting services from both large enterprises and SMEs. The market, estimated at $500 billion in 2025, is projected to maintain a healthy Compound Annual Growth Rate (CAGR) of 7% throughout the forecast period (2025-2033). Key growth drivers include the need for efficient financial management, proactive tax planning, and regulatory compliance across diverse industries. The shift towards digitalization is further fueling market expansion, with cloud-based and web-based accounting solutions gaining significant traction due to their scalability, accessibility, and cost-effectiveness. This trend is particularly pronounced in North America and Europe, which currently hold the largest market shares. However, emerging markets in Asia-Pacific and the Middle East & Africa are also demonstrating significant potential for growth, driven by increasing economic activity and a burgeoning middle class. The market segmentation reveals a strong preference for cloud-based solutions, owing to their flexibility and enhanced collaboration capabilities. Large enterprises are currently the dominant consumers of accounting firm services, reflecting their complex financial needs and the crucial role of accurate financial reporting in their decision-making processes. However, the SME segment is anticipated to witness considerable growth in the coming years, fueled by the increasing availability of affordable and user-friendly accounting solutions. While the market faces restraints such as intense competition among firms and concerns around data security, the overall outlook remains positive, with the continued digitization of financial processes and the demand for specialized accounting expertise driving future expansion. Established players like KPMG, PwC, and Deloitte are leveraging their strong brand reputation and extensive networks to maintain their market leadership, while smaller firms are focusing on niche specializations and innovative service offerings to compete effectively.

The US audit industry, a significant component of the global market valued at $50.24 billion in 2025, is experiencing steady growth, projected at a CAGR of 3.27% from 2025 to 2033. This growth is fueled by several key drivers. Increasing regulatory scrutiny across sectors like finance, healthcare, and technology necessitates robust auditing practices. The rise of data-driven businesses and complex financial instruments further expands the demand for specialized audit services, particularly in areas like information system audits and operational audits. Furthermore, the growing emphasis on corporate governance and transparency, coupled with increasing investor awareness, creates a favorable environment for the industry's expansion. While the industry faces some restraints, such as economic downturns potentially impacting client budgets and the ongoing competition among large and boutique firms, its overall trajectory remains positive. The dominance of the Big Four accounting firms (Deloitte, EY, KPMG, and PwC) is noteworthy, but smaller firms specializing in niche services are also experiencing growth, particularly in areas like compliance and advisory services. The US market, being a major player globally, benefits from a strong regulatory framework and a robust economy, thus ensuring considerable market potential. The segmentation within the US audit industry reveals a diverse landscape. Financial audits remain a core service, but operational audits, driven by the need for efficiency and risk management, are also witnessing significant demand. The advisory and consulting segment is emerging as a key growth area, with firms offering specialized expertise in areas such as cybersecurity, risk assessment, and regulatory compliance. Internal audit functions within organizations are also expanding, leading to increased demand for skilled internal auditors. This diverse service portfolio, coupled with geographical expansion within the US and international markets, contributes to the overall health and projected growth of the US audit industry. The long-term outlook suggests continued expansion, albeit at a moderate pace, driven by factors like increasing regulatory complexity and the evolving needs of businesses across various sectors. Recent developments include: In May 2023, Deloitte and Google Cloud have recently bolstered their decade-long alliance, with a specific focus on deploying Google Cloud's cutting-edge Generative AI capabilities across various industries., In May 2023, after partnering with Microsoft, the EY company unveiled over 20 new Assurance technology capabilities. This marks the end of the first year of a four-year investment exceeding USD 1 billion to deliver the company's next-generation Assurance technology platform.. Notable trends are: Declining Quality of Auditing from the Big 4.

Success.ai’s B2C Contact Data for Accounting Professionals provides access to comprehensive profiles of accountants, auditors, financial advisors, and decision-makers across the globe. Sourced from over 700 million verified LinkedIn profiles, this dataset includes actionable insights and verified contact details, empowering businesses to connect with professionals in the accounting and finance sectors. Whether you aim to market financial solutions, recruit accounting talent, or analyze industry trends, Success.ai ensures your outreach is supported by accurate, enriched, and continuously updated data.

Why Choose Success.ai’s B2C Contact Data for Accounting Professionals? Comprehensive Professional Profiles

Access verified LinkedIn profiles of CPAs, financial analysts, tax advisors, auditors, and accounting managers. AI-validated profiles ensure 99% accuracy, minimizing bounce rates and optimizing communication. Global Coverage Across Accounting Sectors

Includes professionals from public accounting firms, private companies, finance consultancies, and freelance accounting roles. Covers key regions such as North America, Europe, APAC, South America, and the Middle East. Continuously Updated Dataset

Real-time updates reflect role changes, certifications, and organizational shifts, ensuring relevant and effective targeting. Tailored for Accounting Insights

Enriched profiles include work histories, areas of specialization, professional certifications, and decision-making roles. Data Highlights: 700M+ Verified LinkedIn Profiles: Access a vast network of accounting professionals worldwide. 100M+ Work Emails: Direct communication with accountants, auditors, and financial advisors. Enriched Professional Histories: Gain insights into career trajectories, firm affiliations, and areas of financial expertise. Industry-Specific Segmentation: Target professionals in auditing, taxation, forensic accounting, and more with precision filters. Key Features of the Dataset: Accounting Professional Profiles

Identify and connect with tax consultants, auditors, financial planners, and corporate accountants. Engage with individuals driving financial decisions and compliance strategies. Detailed Organizational Insights

Leverage data on firm sizes, industries served, and geographic presence to tailor outreach to accounting firms and consultants. Advanced Filters for Precision Targeting

Refine searches by region, area of expertise, certifications (e.g., CPA, CMA), or years of experience. Customize campaigns to address specific needs like software adoption, compliance support, or advisory services. AI-Driven Enrichment

Enhanced datasets provide actionable details for personalized messaging, highlighting professional achievements and certifications. Strategic Use Cases: Marketing Financial Solutions and Services

Promote accounting software, financial planning tools, or tax solutions to accountants and auditors. Engage with professionals responsible for financial decision-making and client advisory roles. Recruitment and Talent Acquisition

Target HR professionals and accounting firm recruiters seeking accountants, auditors, or financial analysts. Simplify hiring for roles requiring specialized skills and certifications. Collaboration and Partnerships

Identify firms and accounting professionals for collaborations on financial audits, tax consulting, or compliance initiatives. Build partnerships with accountants offering advisory services to diverse industries. Market Research and Strategy Development

Analyze trends in financial services, tax laws, and compliance standards to inform product development and marketing strategies. Use insights to position solutions tailored to the evolving needs of accounting professionals. Why Choose Success.ai? Best Price Guarantee

Access industry-leading B2C Contact Data at unmatched pricing, ensuring your campaigns remain cost-effective and impactful. Seamless Integration

Easily integrate verified contact data into CRMs, recruitment platforms, or marketing systems using downloadable formats or APIs. AI-Validated Accuracy

Depend on 99% accurate data to minimize wasted efforts and maximize engagement outcomes. Customizable Solutions

Tailor datasets to focus on specific accounting niches, regions, or certifications to meet your strategic objectives. Strategic APIs for Enhanced Campaigns: Data Enrichment API

Enhance existing records with verified accounting professional profiles to refine targeting and engagement. Lead Generation API

Automate lead generation for a consistent pipeline of qualified accounting professionals, scaling your outreach efficiently. Success.ai’s B2C Contact Data for Accounting Professionals enables you to connect with the financial experts shaping global businesses. With verified contact details, enriched professional profiles, and global reach, your marketing, recruitment, and strategic effort...

The global accounting firms services market is experiencing robust growth, driven by increasing demand for complex financial reporting, regulatory compliance needs, and the rising adoption of cloud-based accounting solutions. The market size in 2025 is estimated at $500 billion, exhibiting a Compound Annual Growth Rate (CAGR) of 7% from 2025 to 2033. This growth is fueled by several key factors. The increasing complexity of international financial regulations necessitates specialized accounting expertise, benefiting large firms. Simultaneously, the growth of small and medium-sized enterprises (SMEs) is creating a significant demand for cost-effective accounting services, often provided through cloud-based platforms. Further driving market expansion is the ongoing digital transformation within the accounting industry, with firms embracing automation and data analytics to enhance efficiency and accuracy. The market's segmentation, encompassing cloud-based and web-based services across large enterprises and SMEs, reflects this diverse demand. While the market faces constraints such as increasing cybersecurity threats and the need for continuous professional development to keep pace with evolving accounting standards, the overall outlook remains positive. The diverse range of established firms, from international giants like KPMG and Deloitte to specialized niche players, highlights a competitive landscape that encourages innovation and adaptation to evolving market needs. The geographical distribution of the market is also significant, with North America, Europe, and Asia Pacific representing the largest regional markets. North America's dominance is attributed to the presence of numerous large accounting firms and a highly developed business environment. However, the Asia Pacific region is projected to witness the fastest growth due to rapid economic development and increasing adoption of advanced accounting technologies in emerging economies like India and China. This strong regional diversification offers considerable opportunities for both established and emerging players to expand their market reach and service offerings. The continued shift toward digitalization and the ongoing need for reliable, accurate financial reporting will remain key drivers for growth throughout the forecast period. The market's future trajectory is largely contingent on the continuous evolution of accounting standards, technological advancements, and the evolving regulatory landscape.

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.

Snapshot img

Auditing Services Market Size 2024-2028

The auditing services market size is forecast to increase by USD 113.4 billion at a CAGR of 5.96% between 2023 and 2028.

Market is experiencing substantial growth, driven by key trends shaping the industry. A major factor fueling this expansion is the rising adoption of audit management services, as organizations look to enhance efficiency and streamline their auditing processes with the help of audit software. Additionally, the growing need for regulatory compliance is prompting more companies to outsource their auditing functions. 
However, the high costs and ongoing maintenance associated with auditing services present challenges for some businesses, potentially hindering widespread adoption of essentials tools like expense management software. Despite these obstacles, the market is poised for continued growth as companies prioritize compliance and seek more efficient auditing solutions.

What will be the Auditing Services Market Size During the Forecast Period?

Request Free Sample

The market, encompassing both auditing firms and accounting firms, continues to evolve in response to business complexities and regulatory requirements. Companies seek assurance In the reliability and credibility of their systems and processes, driving demand for comprehensive audit services. Long-term value is a key consideration, with operating metrics such as volumes and capacity increasingly important in evaluating audit firms. 
Integrated audits, including strategic audits and internal controls assessments, offer valuable insights for businesses and investors. Audit regulators play a crucial role in maintaining industry standards, while audit procedures extend beyond financial statements to include non-audit service lines and subsidiaries. Global accounting firms have expanded their offerings to meet diverse client needs related to accounting software, ensuring a robust and dynamic market landscape.

How is this Auditing Services Industry segmented and which is the largest segment?

The auditing services industry research report provides comprehensive data (region-wise segment analysis), with forecasts and estimates in 'USD billion' for the period 2024-2028, as well as historical data from 2017-2022 for the following segments.

Service

  Assurance
  Tax
  Advisory


Type

  External
  Internal


Geography

  North America

    US


  Europe

    Germany
    UK


  APAC

    China
    India


  South America



  Middle East and Africa

By Service Insights

The assurance segment is estimated to witness significant growth during the forecast period.

Assurance services refer to independent professional evaluations conducted by certified public accountants, aimed at enhancing the reliability and context of information for decision-makers. The International Professional Practices Framework (IPPF) of the Institute of Internal Auditors (IIA) defines assurance services as an objective examination of evidence to provide an independent assessment of an organization's risk management, governance, and control processes. These services encompass various engagements such as performance, financial, system security, compliance, and due diligence. In today's digital age, assurance services are increasingly crucial with the adoption of cloud-based infrastructure, data analytics, big data, machine learning, mobile computing, business intelligence, and strict regulations. Assurance services help organizations ensure revenue generation and maintaIn their core business by providing unbiased opinions and reducing the risk of incorrect information.

Get a glance at the Auditing Services Industry report of share of various segments Request Free Sample

The Assurance segment was valued at USD 109.90 billion in 2018 and showed a gradual increase during the forecast period.

Regional Analysis

Europe is estimated to contribute 30% to the growth of the global market during the forecast period.

Technavio's analysts have elaborately explained the regional trends and drivers that shape the market during the forecast period.

For more insights on the market share of various regions, Request Free Sample

The North American the market is experiencing steady growth due to the increasing importance of financial structure optimization and regulatory compliance. The US and Canada are the primary contributors to the market's revenue. In the US, organizations face challenges in managing emerging risks during financial structuring and aligning their strategies with their financial structures. Effective auditing procedures are in high demand to address these issues. The market caters to various end-user industries, including IT telecommunications, accounting practices, financial institutions, and banks. Government regulations mandate regular disclosures, further increasing the demand for auditing services.

The US audit industry, a significant segment of the global market, is projected to experience steady growth, driven primarily by increasing regulatory scrutiny, heightened demand for transparency and accountability across diverse sectors, and the growing complexity of financial reporting standards. The market size in 2025 is estimated to be a substantial portion of the global $50.24 billion market, considering the US's prominent position in global finance. While precise US-specific figures are unavailable, we can reasonably estimate the 2025 US market size to be in the range of $15-20 billion, reflecting its large economy and substantial financial activity. Key growth drivers include the expanding need for internal audits within large corporations aiming to mitigate risks and enhance operational efficiency, a rise in demand for specialized audits like those related to cybersecurity and data privacy (Information System Audit and Compliance Audit segments), and the continuous growth of advisory and consulting services alongside traditional audit functions. The industry's growth trajectory is influenced by several factors. The increasing complexity of global business operations necessitates sophisticated audit services. However, economic downturns or periods of reduced business activity can temporarily restrain growth as companies cut back on non-essential expenditures. The competitive landscape is dominated by the "Big Four" firms (Deloitte, EY, KPMG, PwC), alongside a cohort of national and regional players. These firms are constantly adapting their offerings to address evolving client needs, investing heavily in technology and expertise to maintain a competitive edge. Segment-wise, the Financial Audits segment currently holds the largest market share, but there is significant growth potential within the Advisory and Consulting, and Information System Audit segments due to increasing regulatory focus and technological advancements. The projection for the forecast period (2025-2033) indicates a moderate but consistent growth rate, influenced by the interplay of these drivers and restraints. This report provides a detailed analysis of the US audit industry, encompassing market size, growth drivers, challenges, and future trends. Covering the period from 2019 to 2033, with a base year of 2025 and an estimated year of 2025, this research offers valuable insights for stakeholders across the audit ecosystem. The study examines key segments including internal and external audits, along with service lines like operational, financial, and compliance audits, Advisory and Consulting services. The report also analyzes the impact of technological advancements and regulatory changes on market dynamics. Recent developments include: In May 2023, Deloitte and Google Cloud have recently bolstered their decade-long alliance, with a specific focus on deploying Google Cloud's cutting-edge Generative AI capabilities across various industries., In May 2023, after partnering with Microsoft, the EY company unveiled over 20 new Assurance technology capabilities. This marks the end of the first year of a four-year investment exceeding USD 1 billion to deliver the company's next-generation Assurance technology platform.. Notable trends are: Declining Quality of Auditing from the Big 4.