Glossary/Engagements and reports

Service organization

A service organization is a third party that provides services to user entities that are part of those entities' information systems relevant to financial reporting, such as payroll, hosting or custody.

CORAA TeamUpdated November 5, 2026

Definition

Under AU-C 402, a service organization is a third-party organization, or a segment of one, that provides services to user entities that are part of those entities' information systems relevant to financial reporting. Typical examples are payroll processors, outsourced accounting, trust and custody providers, third-party administrators and cloud hosting for the general ledger.

Why it matters in an audit or review

If the services affect how the client's transactions are initiated, recorded, processed or reported, the user auditor must understand them as part of risk assessment. The auditor then decides whether to obtain a service auditor's report, perform procedures at the service organization, or test the client's own controls over the services. Using a service organization does not transfer the client's responsibility for its financial statements.

Example

A company outsources 401(k) administration to a third-party administrator. Contributions, participant records and investment reporting run through the TPA's systems. In the plan audit, the auditor obtains the TPA's SOC 1 Type 2 report and checks that the plan sponsor's user controls, such as reviewing the contribution reports, are operating.

Common mistakes

Treating a vendor as a service organization because it is important rather than because it affects financial reporting information.

Sources

  • AICPA, AU-C Section 402, Audit Considerations Relating to an Entity Using a Service Organization
  • AICPA, AT-C Section 320, Reporting on an Examination of Controls at a Service Organization Relevant to User Entities' Internal Control Over Financial Reporting

Definitions paraphrase AICPA and FASB guidance; read the standard itself before relying on a requirement. Example figures are illustrative. This page is guidance, not professional advice. Report an error

Standards

AU-C 402

Related terms

  • SOC 1 report
    A SOC 1 report is a service auditor's report on controls at a service organization that are relevant to its customers' internal control over financial reporting.
  • Subservice organization
    A subservice organization is a third party used by a service organization to perform some of the services provided to user entities. SOC reports treat it by the carve-out or inclusive method.
  • Complementary user entity controls
    Complementary user entity controls are controls a service organization assumes its customers run, such as reviewing output reports, for the service organization's own controls to work as described.
  • Type 1 vs Type 2 report
    A Type 1 SOC report covers the design of controls at a point in time. A Type 2 report also tests operating effectiveness over a period, which a user auditor generally needs for reliance.

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