AA: Internal control
25 free practice questions on internal control, Section C of the ACCA Audit and Assurance (AA) question bank. Topics include Controls, Why auditors understand internal control, Five components of internal control, Control environment, Recording systems of internal control, Evaluating internal control deficiencies. Each question carries its syllabus reference and a worked explanation. Practise them in the quiz with instant feedback, or read every question with its answer further down this page.
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All 25 internal control questions
The same questions the quiz above draws on, in syllabus order, each with its answer and worked explanation. All 25 are multiple choice.
Why does an auditor need to obtain an understanding of the entity's system of internal control when planning an audit?
- So the auditor can redesign the client's controls where deficiencies are found
- To take over management's responsibility for internal control during the audit
- To identify types of potential misstatements, consider factors affecting the risk of material misstatement, and design appropriate audit procedures including deciding whether to test controls or rely on substantive procedures alone
- To ensure the client's controls comply with all applicable legislation
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Answer: C. Understanding internal controls serves the auditor's risk assessment and procedure design — option C. By understanding what controls exist, the auditor can: identify which areas are susceptible to misstatement; evaluate whether controls are adequately designed; decide whether to test controls (which may reduce substantive testing) or proceed to substantive procedures only. Option A is incorrect — redesigning controls is management's responsibility. Option B is incorrect — the auditor does not take over management's control responsibilities. Option D is incorrect — legislative compliance is not the primary reason for understanding controls in a financial statement audit.
Which correctly lists all five components of a system of internal control as described in ISA 315?
- Control environment; risk assessment process; information system and communication; control activities; monitoring of controls
- Control environment; segregation of duties; authorisation procedures; physical controls; performance reviews
- Leadership; ethics; documentation; communication; performance measurement
- Control environment; audit committee; internal audit; external audit; board of directors
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Answer: A. ISA 315 identifies five components of internal control — option A: (1) the control environment (tone from the top, including governance and culture); (2) the entity's risk assessment process; (3) the information system and communication; (4) control activities (specific policies and procedures); and (5) monitoring of controls. Option B lists types of control activities rather than the five components. Options C and D are invented lists.
Which best describes the 'control environment' component of internal control under ISA 315?
- The specific authorisation procedures for individual transactions
- The computerised system used to process financial transactions
- The overall attitude, awareness and actions of management and those charged with governance regarding internal control and its importance, including integrity, ethical values and the assignment of authority and responsibility
- The physical safeguards over cash and other assets
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Answer: C. The control environment is the foundation of all other internal control components — option C. It encompasses: management's philosophy and operating style; integrity and ethical values; commitment to competence; the role of those charged with governance; and assignment of authority and responsibility. A weak control environment undermines all other controls regardless of how well designed they are. Option A describes individual authorisation controls (a control activity). Option B describes the information system (a separate component). Option D describes physical controls (a type of control activity).
Which method of documenting a client's system of internal control would be most appropriate for a complex processing system with multiple departments and handoffs between them?
- A narrative note only, describing the system in prose
- A questionnaire completed by the client
- A flowchart, which can visually map the flow of documents and authorisations between departments and clearly show where controls occur in the process
- A simple list of controls identified during the audit
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Answer: C. Flowcharts are most appropriate for complex multi-department systems — option C. They visually represent the flow of transactions, documents and authorisations across departments, making it easy to identify controls and, crucially, where controls are absent. Narrative notes (option A) become unwieldy for complex systems and are harder to review for completeness. Questionnaires (option B) are useful for identifying whether controls exist but do not map the process flow. A simple list (option D) lacks the structural representation needed to evaluate a complex process.
An auditor identifies that a company's purchasing department raises purchase orders and also approves supplier invoices for payment. Which correctly evaluates this situation?
- This is an effective control as one department handles the entire purchasing process efficiently
- This is acceptable because the purchasing department has the best knowledge of what was ordered
- This is a significant control deficiency: the same department raises purchase orders AND approves invoices, eliminating the segregation of duties that would normally prevent fictitious or inflated purchases being approved for payment
- This is only a deficiency if the amounts involved exceed materiality
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Answer: C. The lack of segregation of duties is a significant deficiency — option C. Effective internal control requires that the person who initiates a transaction (raises the purchase order) should not be the same person who approves the resulting liability for payment (approves invoices). When one department does both, a corrupt or careless employee could raise fictitious purchase orders and approve fraudulent invoices for payment. Option A incorrectly values efficiency over control. Option B is a rationalisation for poor control design. Option D is incorrect — segregation of duties is a structural issue that applies regardless of monetary value.
An auditor identifies that a company allows its credit controller to both extend credit to new customers and write off irrecoverable debts. Which correctly evaluates this situation?
- This is good practice — the credit controller's expertise makes them best placed to make both decisions
- This is only a problem if the write-offs exceed the materiality threshold
- This is a significant deficiency: the same person who approves credit can write off debts without independent review, creating both the opportunity and concealment mechanism for misappropriating customer payments
- This control is adequate because the credit controller acts under board authority
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Answer: C. This is a classic segregation of duties deficiency — option C. The credit controller who can approve credit AND write off debts has both the ability to misappropriate customer receipts and the mechanism to conceal the theft (by writing off the receivable as irrecoverable). Effective control requires that write-offs be approved by an independent manager. Option A incorrectly values expertise over independence. Option B incorrectly applies monetary materiality to a structural control issue. Option D is irrelevant — board authority does not remove the segregation problem.
Which represents an inherent limitation of internal control that means no system can provide absolute assurance?
- Internal controls are only useful in large organisations
- Internal controls are optional and management can choose to implement them or not
- Collusion between employees can override segregation of duties controls that would otherwise be effective
- Controls are only effective if they are documented in writing
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Answer: C. Collusion is a classic inherent limitation of internal control — option C. Segregation of duties is a powerful control, but if two or more employees collude, they can circumvent it. Other inherent limitations include: management override; human error; controls becoming outdated; and the cost-benefit constraint. Option A is incorrect — controls are relevant at all sizes. Option B is incorrect — controls are not optional. Option D is incorrect — many effective controls are automated or procedural rather than documented.
Which is a key control objective for the sales system?
- All sales are made at the highest possible price
- All sales are made exclusively to credit customers
- All sales transactions are properly authorised, recorded completely and accurately, and cash receipts are banked promptly and intact
- Sales ledger balances are reconciled to the general ledger on an annual basis
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Answer: C. The key control objectives for the sales system relate to authorisation, completeness, accuracy and safeguarding of receipts — option C. Controls should ensure: sales are made to authorised customers at authorised prices; all sales are recorded (completeness); recorded amounts are correct (accuracy); and cash received is promptly banked without being diverted. Option A (highest price) is a commercial objective. Option B (credit customers only) is not universal — many businesses have cash sales. Option D (annual reconciliation) is too infrequent for effective control.
A company receives a large delivery of raw materials. Which control procedure provides the best evidence that goods received match the purchase order?
- The warehouse manager signs the delivery note
- The purchasing department files a copy of the purchase order
- The receiving department counts and inspects goods received and reconciles them to the original purchase order before accepting the delivery
- The finance department records the invoice when it arrives from the supplier
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Answer: C. Reconciling goods received to the purchase order at the point of receipt is the most effective control — option C. This three-way match (purchase order, goods received note, supplier invoice) ensures goods ordered were actually received, in the correct quantity and condition, before payment is approved. Option A (signing the delivery note) only confirms receipt — it does not verify the goods match the order. Option B (filing the order) is a documentation step, not a verification control. Option D (recording the invoice) occurs after receipt and does not confirm physical verification.
Which control most effectively reduces the risk of fictitious employees being included on the payroll?
- Calculating total payroll costs and comparing them to the prior year
- Paying all employees by cheque rather than bank transfer
- Requiring HR to independently authorise all additions to and deletions from the payroll master file, separate from the payroll processing function
- Allowing employees to update their own payroll records through a self-service portal
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Answer: C. Segregation of duties between HR (authorising changes to the payroll master file) and payroll processing is the most effective control against ghost employees — option C. If the same person can add employees to the payroll and also process payments, they can invent fictitious employees and divert their wages. Option A (year-on-year comparison) is an analytical check that may detect unusual trends but not small, consistent frauds. Option B (payment method) does not address fictitious employees. Option D (self-service updates) actually increases risk.
Which best describes the purpose of an inventory count?
- To calculate the cost of sales figure for the income statement
- To ensure inventory is stored in the most cost-efficient manner
- To provide physical verification that inventory quantities recorded in the accounting system actually exist and to identify obsolete or damaged items
- To reconcile the trade payables ledger to supplier statements
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Answer: C. An inventory count provides physical verification of existence and condition — option C. By counting physical inventory and comparing it to records, the company can identify: recording errors or theft (quantities differ from records); and items that are damaged, obsolete or slow-moving (may require write-down to NRV). This serves the financial reporting objectives of existence and valuation. Option A (calculating cost of sales) is achieved through accounting records. Option B relates to warehouse management efficiency. Option D relates to the purchases cycle.
Which control best addresses the risk of misappropriation of cash receipts?
- Preparing monthly management accounts
- Allowing the cashier to also authorise payments
- Ensuring that the employee who opens mail and lists cash receipts is different from the employee who posts receipts to the sales ledger and the employee who reconciles the bank account
- Counting cash once per year during the annual audit
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Answer: C. A three-way segregation of duties over cash receipts is the most effective control — option C. Separating: (1) opening mail and listing receipts; (2) posting to ledgers; and (3) bank reconciliation ensures no single employee can misappropriate cash and conceal the theft through ledger manipulation or reconciliation falsification. Option A (management accounts) is too infrequent. Option B (cashier authorises payments) creates a self-approval risk. Option D (annual cash count) is far too infrequent.
A company has many portable non-current assets including laptops. Which control best addresses the risk of assets being removed without authorisation?
- Calculating depreciation charges at year end
- Recording all assets at historical cost in the financial statements
- Maintaining a non-current asset register with unique identification numbers tagged to each asset, and conducting periodic physical verification of assets against the register
- Allowing any employee to remove assets for home working without formal procedures
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Answer: C. A non-current asset register with physical tags and regular verification is the most effective control — option C. The register provides a record of each asset's existence and location; physical verification confirms assets are still held; unique tags deter theft and enable assets to be traced. Together these address the key assertions of existence and completeness. Option A (depreciation) is an accounting procedure, not a safeguarding control. Option B (historical cost recording) is an accounting policy choice. Option D describes an absence of control.
An auditor identifies that a client has no formal budgeting process and no comparison of actual results to budget. To whom should this significant deficiency be reported, and in what form?
- Only to the audit team — significant deficiencies should not be communicated to the client
- Verbally to the finance director only, with no written record
- In writing to management and those charged with governance, describing the deficiency and its implications
- To the relevant regulatory authority immediately
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Answer: C. Significant deficiencies must be communicated in writing to management and those charged with governance — option C. ISA 265 requires auditors to communicate significant deficiencies in internal control to those charged with governance and to report other identified deficiencies to management. Written communication is required for significant deficiencies to ensure a formal record and allow management and governance to take appropriate remedial action. Option A is incorrect — the whole point of reporting is to enable management to address the issue. Option B does not meet ISA 265's written communication requirement. Option D is not required for internal control deficiencies.
An auditor's report to management identifies a deficiency: customer credit limits are not reviewed or updated, and no credit checks are performed on new customers. Which is the most appropriate control recommendation?
- Ensure credit limits are appropriate
- Reduce the number of credit customers to minimise risk
- The credit control department should perform credit reference checks on all new customers before credit is extended, and should review and update existing customer credit limits at least annually using aged receivables data and payment history
- Increase the allowance for irrecoverable debts to cover any bad debts that arise
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Answer: C. An effective recommendation must describe specific actions, not just objectives — option C. The recommendation must: (1) perform credit checks on new customers before extending credit (preventive); (2) review existing limits periodically using objective data (detective/preventive). Option A ('ensure credit limits are appropriate') is phrased as an objective rather than an action — the examiner specifically warns that 'ensure that' phrasing is unlikely to score. Option B reduces business, not risk. Option D treats the symptom, not the cause.
Why is it important for auditors to communicate with those charged with governance throughout the audit?
- Because those charged with governance pay the audit fee and must be kept informed for commercial reasons
- Because regulators require auditors to copy all correspondence to the audit committee
- Because effective two-way communication helps the auditor obtain information relevant to the audit, informs governance about significant audit findings and matters of concern, and strengthens the governance process
- Because the audit committee is responsible for preparing management's responses to the auditor
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Answer: C. Communication with those charged with governance serves multiple purposes — option C. The auditor should communicate: the planned scope and timing of the audit; significant findings including material weaknesses in internal control; auditor independence; and any matters required by ISAs (e.g. uncorrected misstatements, going concern matters). This two-way communication helps governance fulfil its oversight function and ensures the auditor has all relevant information. Option A is commercially relevant but not the professional reason. Option B overstates the requirement. Option D is incorrect — audit committee members do not draft management responses.
Which factor would most support the need for an internal audit function?
- The company has fewer than ten employees and is owner-managed
- The company's external auditor is highly experienced in the industry
- The company is large, complex and geographically dispersed, with significant risks requiring ongoing monitoring beyond the scope of the external audit
- The company operates in a single, simple business segment with stable processes
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Answer: C. Size, complexity and geographic dispersion are the primary drivers for internal audit — option C. Large, complex organisations face greater risks and have more complex control environments. The external auditor provides annual assurance on financial statements but not continuous monitoring. An internal audit function can perform ongoing risk-based reviews that complement external audit. Option A (small, owner-managed) suggests internal audit is less necessary — the owner can directly oversee operations. Option B relates to external auditor quality, not need for internal audit. Option D (simple, stable) reduces the case for internal audit.
Which represents best practice in the structure of an internal audit function to maximise its effectiveness?
- The internal audit function should report directly to the chief financial officer only
- Internal auditors should only report deficiencies that management has already identified
- The head of internal audit should have direct access to the audit committee, with functional reporting to the audit committee and administrative reporting to management; the audit committee should approve the internal audit charter and plan
- The internal audit function should focus exclusively on financial controls
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Answer: C. Dual reporting — functional to the audit committee, administrative to management — is best practice — option C. Functional reporting to the audit committee ensures independence: the committee approves the internal audit charter, evaluates the chief internal auditor's performance, and ensures adequate resources and scope. Administrative reporting to management handles day-to-day matters. Option A (reporting to CFO only) reduces independence since the CFO is one of the parties being audited. Option B defeats the purpose of internal audit. Option D ignores the broad scope of modern internal audit.
Which correctly distinguishes between external audit and internal audit?
- Both external and internal auditors report to management and have the same objective
- External auditors are employees of the company and internal auditors are always independent third parties
- External auditors are appointed by and report to shareholders; their primary objective is to give an opinion on the financial statements. Internal auditors are employed by or contracted to the organisation; their work covers a broader range including risk management, controls and operational efficiency
- External audit and internal audit both provide an audit opinion on the financial statements
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Answer: C. Option C correctly identifies the key distinctions. External auditors are appointed by and report to the shareholders, are independent of the organisation, and have the primary objective of expressing an opinion on the financial statements. Internal auditors are employed by, or contracted to, the organisation and report to management or the audit committee; their work is broader, covering risk management, internal controls, operational efficiency, compliance and fraud investigation. Option A is wrong because the two have different objectives and reporting lines. Option B reverses the employment relationship (it is internal auditors, not external, who work within the organisation). Option D is wrong because only external auditors give an audit opinion on the financial statements.
Which is a limitation of the internal audit function that affects its ability to provide assurance?
- Internal auditors are always more technically qualified than external auditors
- Internal audit functions are required by law in all companies
- Internal audit can only review financial matters
- Internal auditors may lack independence from management if their appointment, remuneration and scope of work are controlled by the very management they are reviewing
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Answer: D. The potential lack of independence is the primary limitation of internal audit — option D. Internal auditors are employed by (or contracted to) the organisation, so their independence from management may be compromised: management controls their budget, terms of reference, and sometimes their career progression. To mitigate this, best practice requires internal audit to report functionally to the audit committee. Option A is a generalisation with no factual basis. Option C is incorrect — internal audit covers a very broad scope. Option B is incorrect — internal audit is not legally mandated in most jurisdictions.
Which is a disadvantage of outsourcing the internal audit function to an external firm?
- The outsourced provider will always charge less than employing in-house staff
- An outsourced provider can never be asked to perform specialist technical work
- Outsourcing guarantees complete independence of the internal audit function
- The outsourced provider may initially lack detailed knowledge of the company's specific operations, systems and culture, which may reduce the effectiveness of audit work in the short term
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Answer: D. A key disadvantage of outsourcing is the initial lack of company-specific knowledge — option D. An external provider brings generic expertise and fresh perspective, but in the early period they will not know the company's specific systems, risks, culture and people as well as an in-house team would. The examiner specifically noted in MJ25 that 'loss of in-house knowledge' is a genuine disadvantage. Option A is not always true. Option C is a potential advantage, not disadvantage. Option B is incorrect — outsourced providers often provide specialist skills as an advantage.
A company's internal audit function has been asked to conduct a value for money (VFM) audit of the procurement function. What does a VFM audit assess?
- Whether the procurement team's salaries represent good value
- Whether the company's suppliers are charging market rates for their goods
- Whether all procurement transactions comply with company purchasing policies
- Whether the organisation is achieving economy (acquiring inputs at minimum cost), efficiency (using inputs productively) and effectiveness (achieving intended outcomes) in its procurement activities
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Answer: D. A VFM audit assesses the three Es: economy, efficiency and effectiveness — option D. Economy: are inputs acquired at the minimum cost consistent with required quality? Efficiency: are inputs used to achieve maximum output? Effectiveness: is the procurement function achieving its intended outcomes (right goods, right quality, right time, right price)? This is broader than mere policy compliance. Option A (salary value) is not the focus of a procurement VFM audit. Option C describes a compliance audit. Option B is one element of economy but not the entire VFM assessment.
Which best describes an operational internal audit assignment?
- A review of the financial statements to check for misstatements
- A compliance check to confirm that all employees are following HR policies
- A review of the external auditor's working papers
- An evaluation of the efficiency and effectiveness of operational processes such as procurement, logistics or customer service, with a view to recommending improvements
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Answer: D. Operational auditing assesses efficiency and effectiveness of business processes — option D. Unlike financial auditing (which focuses on financial statement accuracy) or compliance auditing (which checks rule adherence), operational auditing looks at whether business processes are achieving their objectives efficiently. For example, an operational audit of procurement might assess whether supplier selection, ordering and payment processes are optimal, and recommend process improvements. Option A describes external audit work. Option C — reviewing external audit papers — would have confidentiality implications. Option B describes a compliance audit of HR policies.
A company's internal audit function currently reports to the CFO. Which best describes why this arrangement is suboptimal under governance best practice?
- The CFO is not qualified to understand internal audit reports
- Reporting to the CFO is required by law and cannot be changed
- The CFO's workload is too heavy to also manage the internal audit function
- The internal audit function should be independent of the management it reviews; reporting to the CFO creates a risk that the CFO can limit the scope of internal audit work, influence findings, or prevent adverse reports reaching the board and audit committee
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Answer: D. Reporting to the CFO compromises internal audit independence — option D. The CFO is a member of senior management — one of the parties whose work internal audit reviews. If internal audit reports to the CFO, the CFO has the ability to: restrict the scope of work; influence the framing of findings; delay or prevent adverse reports reaching the board; and manage the internal auditor's career and remuneration. Best practice requires the chief audit executive to have functional independence through reporting to the audit committee. Option A is incorrect — CFOs typically have the financial expertise to understand such reports. Option C is an administrative concern, not an independence concern. Option B is incorrect.
An audit client outsources its payroll processing to a payroll bureau. Which correctly describes the audit considerations?
- The auditor need not consider the payroll bureau as payroll is no longer the client's responsibility
- The bureau's involvement eliminates all payroll audit risk
- The auditor should audit the payroll bureau directly as a separate engagement
- The auditor must obtain an understanding of how the payroll bureau processes data and the controls in place; if the client cannot provide information, the auditor may need to obtain an ISAE 3402 report from the bureau's auditors to gain assurance over controls
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Answer: D. Service organisation considerations are addressed in ISA 402 — option D. When a client outsources significant functions, the auditor must understand the service organisation's controls to assess the risk of material misstatement. If the client does not have adequate information about the bureau's controls, the auditor can obtain an ISAE 3402 report from the bureau's own auditors. Option A is incorrect — the client remains responsible for its financial statements regardless of outsourcing. Option C — auditing the bureau directly — is not the standard approach. Option B is incorrect — outsourcing does not eliminate audit risk.
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