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In 2024, Deloitte reorganized its global business units, and thus the figures are not comparable with previous years. Consulting is still its largest business, generating a total of **** billion U.S. dollars in revenue in 2025. 

Deloitte’s business units

Deloitte Touche Tohmatsu Limited, generally referred to simply as Deloitte, is a global accounting firm operating in over *** countries. With the global headquarters in London, UK and U.S. headquarters in New York City, the company provides services across a wide variety of industry groups, with around half their revenue being derived from the financial services and consumer business and transportation sectors. Since 2013, Deloitte has been divided into five service lines: audit and assurance, consulting, financial advisory, risk advisory and tax and legal. Prior to this, audit and assurance and risk advisory were combined.

The Big Four

In terms of total revenue, Deloitte is the largest of the Big Four accounting firms worldwide. The market dominance of Deloitte has largely been down to its presence in the Americas region, where this area of the world accounts for just over half their revenue. When broken down by region, the second-largest firm of the Big Four, PwC, has a larger share of the market in the EMEA region. PwC has also generated the greatest revenue of the Big Four from tax, audit & risk advisory services, whereas the highest earning service line for Deloitte has consistently been consulting.