Anyone working in finance knows the term: Segregation of Duties. Yet in practice, it often remains a concept on paper. In reality, it is an effective tool for preventing errors, making fraud more difficult, and sharpening accountability.
What is Segregation of Duties?
Segregation of Duties means that critical processes must not be fully controlled by a single employee, but distributed across multiple people. In accounting, this means: whoever records a document should not also approve it. Whoever initiates payments should not have unrestricted access to the accounts.
The principle is based on a simple insight: when multiple people are involved in a process, the risk of incorrect postings and unintended payments decreases — and the threshold for deliberate manipulation rises significantly.
Segregation of Duties as a Compliance Requirement
Segregation of Duties is a core principle of internal control systems. Recognised auditing standards require auditors to assess the separation of functions as part of the internal control system. A lack of Segregation of Duties is regularly classified as a control weakness — particularly for organisations subject to internal or external audits. Auditors examine whether processes are designed so that no single person can fully control a transaction. If inadequate separation of functions is identified, this can lead to audit deficiencies or regulatory consequences.
billbox takes the principle of Segregation of Duties into account directly when assigning roles and permissions. If permissions are configured in a way that allows a single user to control critical processes alone, billbox issues an automatic notification. This allows organisations to make informed decisions about roles and permissions before compliance risks arise.
What Happens When Segregation of Duties Is Missing?
A typical risk that arises without Segregation of Duties: an employee records an incoming invoice, approves it themselves, and initiates the payment — without a second person ever reviewing the transaction. Access rights accumulate over time, for example through staff changes, organisational growth, or the desire to keep processes lean. Without adequate controls, critical permission conflicts go unnoticed. This is precisely why it is not enough to define Segregation of Duties once. It must be reviewed regularly and adapted to evolving structures.
Implementing Segregation of Duties Systematically
For finance teams looking to strengthen their separation of functions, two measures are key. First, identify critical process combinations. Not every task needs to be separated. But wherever a single person can initiate, approve, and post a transaction, action is needed. Second, review existing permissions regularly. A systematic review of who holds which rights in the system reveals whether problematic combinations have crept in over time.
To learn what clear roles and permissions look like in practice within a digital invoice process, see our podcast episode on Roles & Permissions.
