Revenue of Deloitte worldwide by service line 2006-2023

Overall revenue from the four service lines operated by Deloitte has increased year-on-year for over a decade. The consulting line of the firm grew significantly when compared to 2022. This service line generated approximately 29.6 billion U.S. dollars of revenue (out of a total revenue of 64.9 billion U.S. dollars) in 2023.

Deloitte’s business units

Deloitte Touche Tohmatsu, generally referred to simply as Deloitte, is a global accounting firm operating in over 150 countries. Headquartered 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 in 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.