Big Four: revenue by function 2025| ��ƽ��

Revenue of the Big Four accounting/audit firms worldwide in 2025, by function (in billion U. S. dollars)

Characteristic	Audit/Assurance/AERS*	Advisory/Consulting**	Tax	Other***
-	-	-	-	-
-	-	-	-	-
-	-	-	-	-
-	-	-	-	-

Download

Source

Show detailed source information?

Already a member?

Sources

Release date

December 2025

More information

Region

Worldwide

Survey time period

2025

Supplementary notes

* PwC, Ernst & Young - "Assurance"; KPMG - "Audit"; Deloitte - "AERS - Audit and enterprise risk services"
** Deloitte - "Consulting"; Ernst & Young, PwC & KPMG - "Advisory"
*** Deloitte - "Financial Advisory"; Ernst & Young - "Transaction Advisory Services"
Fiscal years: Deloitte ends May 31; PwC and EY end June 30; KPMG ends September 30.
Values have been rounded.

"In 2024, Deloitte reorganized its global business units. FY2025 revenue by business is presented aligned to the new business unit structure; FY2024 revenue by business has been restated to align with the new business unit structure and is included for comparative purposes."

Citation formats

In 2025, Deloitte generated roughly **** billion U.S. dollars in revenue from its consulting segment, making it the leader in the consulting market among the Big Four. In 2024, Deloitte reorganized its global business units, resulting in a realignment of its business lines.

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 2025, they brought in more than *** billion U.S. dollars in global combined revenue. Out of the four, expectedly, Deloitte also 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 ** 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 billion U.S. dollars, then Ernst & Young, that brought in billion U.S. dollars in 2024. KPMG brought in the least, generating **** billion U.S. dollars the same year.