Deloitte member firms offer services in the following functions, with country-specific variations on their legal implementation (i. e., all operating within a single company or through separate legal entities operating as subsidiaries of an umbrella legal entity for the country). The 2015 revenue shares are listed in parentheses.^[4]

• Audit (28%): Provides the organization's traditional accounting and audit services, as well as internal auditing and IT control assurance.^[44]
• Consulting (35%): Assists clients by providing services in the areas of enterprise applications, technology integration, strategy & operations, human capital, and short-term outsourcing.^[45]
• Financial Advisory (9%): Provides corporate finance services to clients, including dispute, personal and commercial bankruptcy, forensics, e-discovery, document review, advisory, capital projects consulting and valuation services.^[46][47]
• Enterprise Risk (10%): Provides offerings in enterprise risk management, information security and privacy, data quality and integrity, project risk and business continuity management.^[48]
• Tax (19%): Helps clients increase their net asset value, undertake the transfer pricing and international tax activities of multinational companies, minimize their tax liabilities, implement tax computer systems, and provides advisory of tax implications of various business decisions.^[49]