An internal auditor discovers that a vendor had submitted invoices and was paid for services not rendered.
Which of the following controls is most appropriate to address this type of issue?
- The accounts payable clerk should compare the acknowledgment of goods and services to the invoice.
- The supervisor should observe the input of invoices into the payment system.
- The supervisor should verify that the amount paid agrees with the contracted amount.
Answer(s): A
Explanation:
Comprehensive and Detailed Step-by-Step Reference to IIA Standards:
Standard 2130 - Control: Internal audit must assess whether controls ensure compliance and prevent fraud.
Reasoning:
Option A directly addresses the root cause: payment for unrendered services. Requiring acknowledgment of receipt ensures only valid invoices are paid.
Option B (observing invoice input) ensures data entry accuracy but does not address fraud.
Option C (verifying amounts) ensures correct payments for legitimate invoices but does not prevent unauthorized payments.
Best Practice:
Verifying acknowledgment of services before payment is a preventive control, reducing fraud risk.
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