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The payroll system: controls, tests and typical weaknesses

ICAN Skills, Audit, Assurance and Forensics. Syllabus area B, the nature and use of internal control

9 min read · Updated 6 November 2026

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In this part

A factory in Agbara pays 600 workers every month. Two years later, an audit finds 14 names on the payroll that match no real employee, plus six people who left long ago and are still paid into accounts controlled by a payroll officer. Payroll is repetitive, it is large, and it is easy to hide fraud in it. The auditor tests it with controls because checking every payslip is not practical.

This topic covers the four parts of the payroll cycle: calculating gross pay, calculating deductions, recording pay in the accounts and paying staff and the authorities, with the risks, objectives, controls and tests for each, followed by the weaknesses the examiner is likely to plant in a case study. The previous topic covered purchases and the next covers bank and cash.

In 30 seconds

Parts: gross pay; deductions; recording; payment. Risks: phantom or departed employees paid, pay for work not done, wrong gross pay, wrong or unauthorised deductions, wrong recording, wrong net pay, deductions not paid to the authorities, payment to the wrong person. Controls: segregation, authorised starters and leavers, authorised time records and overtime, senior review of totals, exception reports, written consent for voluntary deductions, control account reconciliations, authorised payment lists, bank reconciliations.

Typical weaknesses: clocking on for others, unauthorised overtime, junior staff paying wages, unauthorised lists, weak passwords, leaver e-mails ignored.

Key terms in plain English

TermWhat it means
Phantom employeeA person on the payroll who does not exist or has left
Gross payPay before deductions
Net payPay after deductions
Clock cardA card used to record time at work
Control accountA ledger total used to check detailed records
Exception reportA list of items that break a rule

Syllabus check

This topic is in syllabus area B, the nature and use of internal control (20% of marks). It covers:

  • accounting systems and internal controls in the payroll cycle
  • the evaluation of internal controls
  • tests of controls

CAMA 2020 and the payroll system

The Companies and Allied Matters Act 2020 (CAMA 2020) is the company law of Nigeria. The sections below apply to this topic.

SectionWhat it saysLink to this topic
s. 404(2)The auditor states whether proper books of account were keptPayroll records are part of the books
s. 405Corporate responsibility for financial reportsManagement designs payroll controls
s. 407(3)Right of access to books, accounts and vouchersAccess to payroll records and bank lists

The rules in more depth

The elements of the payroll system

The payroll cycle has four elements:

  • (a) calculating gross wages and salaries
  • (b) calculating tax and other deductions
  • (c) recording wages and salaries payable in the accounts
  • (d) paying wages and salaries

The tables below set out risks, objectives, controls and tests for each.

Calculating gross wages and salaries

RiskControl objectivePrincipal controlsTests of control
Pay to people who are not employees, such as former staff or phantom employeesOnly real employees are paidSegregation: the person who prepares the payroll does not pay it. Formal authorisation and documentation for new employees, and for putting them on the payroll file. Departmental payroll lists authorised by an appropriate personCheck that segregation exists. Check authorisation documents for new employees. Check that the payroll lists are properly authorised
Pay for work not doneEmployees are paid only for work doneTime sheets for time-paid staff, authorised by the supervisor; a clock card system for hourly workers. Formal personnel records of pay rates, start and leaving datesCheck time sheets for the supervisor's signature. Observe the clock card system operating. Check payroll file details against personnel records
Gross pay calculated wronglyGross pay is calculated correctlyA senior manager checks the total payroll cost each week or month for reasonableness. In an IT system, exception reports of gross pay over set limits are followed upCheck the signature or initials of the manager on the payroll list. Use test data to check that exception reports work, and review them for evidence of follow-up
Bonus or overtime paid without authorityBonus and overtime payments are authorisedAuthorisation by the appropriate managerCheck a sample of bonus payments for correct calculation and authorisation

Tax and other deductions

Deductions include income tax under the pay-as-you-earn system, pension contributions and other deductions such as union dues and loan repayments.

RiskControl objectivePrincipal controlsTests of control
Tax and other deductions calculated wronglyDeductions are calculated correctlyProcedures, manual or IT, use up-to-date tax rates. Senior management checks total deductions each week or monthReview manual procedures and the rates used. In an IT system, check the general IT controls over development, testing and implementation, and use test data compared with independently calculated figures. Check for the manager's signature on total deductions
Voluntary deductions without the employee's consentVoluntary deductions are made only with consentWritten authorisation by the employee, kept in the payroll fileCheck the payroll file against the deductions made, to confirm that voluntary deductions are authorised

Recording wages and salaries in the accounts

RiskControl objectivePrincipal controlsTests of control
Gross pay, deductions and net pay not properly recordedThey are recorded properly and accuratelyAccounts prepared from payroll data approved by a senior manager. Accounting for payroll completed within a strict timescale. Payroll control accounts regularly reconciled to the payroll records of all employeesEvidence of formal approval of the payroll. Checks on the recording procedures and the time taken. Documentary evidence of reconciliations and of their review

In an integrated IT system, the nominal ledger is updated automatically.

Payment of wages and salaries

RiskControl objectivePrincipal controlsTests of control
Wrong net payCorrect net pay is paidFor automated bank transfers, the payment list is authorised by an appropriate managerCheck the authorised lists of payments
Wrong amounts of deductions paid to the authoritiesThe correct deductions are paid to the tax and other authoritiesFormal procedures and a timetable for paying deductions and recording the paymentsCheck the procedures and the recording of payments
Payment to the wrong personNet pay goes only to the employeeBank statements checked against payments recorded in the accountsEvidence of bank reconciliation checks
Payments wrongly recordedPayments are correctly recordedControls to reconcile the total payable to the total paidCheck that each payroll, payable and paid, is reconciled; in an integrated IT system, process a dummy payroll run to be satisfied the system works

These assume payment by bank transfer. When wages are paid in cash, or casual labour is paid in cash, additional controls are needed, such as payment in the presence of a supervisor, signature on a payroll sheet by each recipient, a record of unclaimed wages, and prompt banking of any unclaimed cash.

Possible control weaknesses in a payroll system

In a case study the examiner may describe a payroll system and ask for the weaknesses. Possible ones are:

  • Recording of time at work. Hourly-paid staff use identity cards and a clock to "clock on" and "clock off". The risk is that an employee clocks on for a colleague using the colleague's card. The control is daily observation of the clocking-on process.
  • Overtime not authorised, or the amount not checked and authorised.
  • Payments made by a junior person in accounts without proper authorisation.
  • Departmental payroll lists not authorised, with a risk of phantom employees.
  • Passwords that can be guessed, such as names of family members or pets. They should be hard to guess, with letters and numbers, and changed regularly.
  • E-mails as the only notice that staff have left. Information not on paper is more likely to be overlooked, so former employees continue to be paid. A control is numbered e-mails with a confirmation of receipt by payroll.

Other points to look for are:

  • no independent review of the payroll before payment
  • the same person adding employees, changing pay rates and processing payroll
  • bank details of employees changed without evidence of request
  • failure to compare the payroll list to the staff list or to an independent head count

Substantive consequences

If the tests of controls show that payroll controls operate, the auditor can reduce substantive tests on payroll expense, such as the detailed re-calculation of pay, but analytical procedures of total payroll cost against headcount and pay rates remain useful.

If controls are weak, the auditor extends detailed tests, can include a surprise payout of wages to verify that employees exist, and checks that accrued wages, pension and tax liabilities at the year end are complete.

Worked examples

Example 1: phantom employee. The payroll clerk can add employees to the payroll file and also process the monthly payroll.

  1. There is no segregation, so a phantom employee could be added and paid into the clerk's account.
  2. Starters should be approved by HR and a manager, and the payroll list reviewed against the personnel records.

Example 2: clocking on. A supervisor notices that the card of a worker is clocked on at 7.00 a.m. but he is absent until 10.00 a.m.

  1. A colleague has clocked on for him.
  2. The control is observation of clocking-on and supervisor review; the auditor can observe the process in operation.

Example 3: leaver. Human resources e-mails payroll that an employee left in March. Payroll does not act, and he is paid until July.

  1. Four months of pay were paid to a former employee.
  2. The control is a numbered leaver notice and a confirmation from payroll, plus review of the payroll for leavers.

Example 4: test data. The auditor wants to see that the system flags gross pay above ₦2 million.

  1. Input a dummy employee with gross pay of ₦3 million.
  2. Check that the system produces an exception report entry and that management follows it up.

How to score full marks

  • Divide by the four parts of the cycle.
  • Give phantom employees and authorisation first.
  • Link each test to the control it checks.
  • In weakness questions state the risk and the recommended control.

Common mistakes in the exam

  • Forgetting segregation between preparing and paying the payroll.
  • Ignoring leavers.
  • Giving controls without tests.
  • Forgetting payment of deductions to the authorities.

Quick revision

  • Gross pay, deductions, recording, payment.
  • Phantom employees; authorised lists; time records.
  • Control accounts; reconciliations; bank statements.
  • Weaknesses: clocking on, overtime, junior payers, passwords, e-mail leaver notices.

Practice questions

Questions 1 to 10 are multiple choice. Questions 11 to 13 are written. Try each before opening the answer.

Question 1. A phantom employee is:

  1. A person on the payroll who does not exist or has left
  2. A new starter
  3. A manager
  4. A director
Show the answer

A. A fraud risk.

Question 2. Time sheets for time-paid staff should be:

  1. Authorised by a supervisor
  2. Destroyed
  3. Kept by the employee
  4. Left blank
Show the answer

A. To pay only for work done.

Question 3. Voluntary deductions need:

  1. Written authority of the employee
  2. Verbal consent only
  3. No approval
  4. Approval by the auditor
Show the answer

A. Kept in the payroll file.

Question 4. A control to reconcile payroll to the accounts is the:

  1. Control account reconciliation
  2. Bank statement of sales
  3. Customer statement
  4. Stock count
Show the answer

A. Between records and ledger.

Question 5. Clocking on for a colleague is prevented by:

  1. Observing the clocking-on process
  2. Higher pay
  3. More overtime
  4. Annual leave
Show the answer

A. Daily observation.

Question 6. Payment lists for bank transfers should be:

  1. Authorised by an appropriate manager
  2. Prepared by anyone
  3. Unsigned
  4. Emailed to staff
Show the answer

A. Authorised lists.

Question 7. A risk of leaver e-mails is that:

  1. Former employees continue to be paid
  2. Staff are paid early
  3. Tax is cut
  4. Passwords are shared
Show the answer

A. Not acted upon.

Question 8. Exception reports in IT payroll show:

  1. Gross pay above set limits
  2. Sales
  3. Purchases
  4. Stock
Show the answer

A. For follow-up.

Question 9. Deductions paid to the authorities should follow:

  1. A formal timetable
  2. Whatever is convenient
  3. Staff requests
  4. Year end only
Show the answer

A. Procedures and timetable.

Question 10. Weak passwords in payroll are those:

  1. Easy to guess such as names of pets
  2. With letters and numbers
  3. Changed regularly
  4. Long and random
Show the answer

A. They should be hard to guess.

Question 11 (10 marks). Describe the risks and controls over gross pay and the tests of controls the auditor would carry out. (8 marks)

Question 12 (10 marks). Identify five control weaknesses that may exist in a payroll system and recommend how to correct them. (7 marks)

Question 13 (10 marks). Explain controls over the payment of wages and the recording of payroll in the accounts. (5 marks)

Model answers

Show the model answer to Question 11

Risks: payment to non-employees; pay for work not done; wrong gross pay. (2) Controls: segregation; authorised starters and lists; time sheets and clock cards; senior review of totals; exception reports; authorised bonuses. (3) Tests: check segregation and authorisations; check time sheets; observe clocking; check manager initials; test data for exception reports; sample of bonuses. (3)

Show the model answer to Question 12

Any five with remedy:

  • clocking on for others, observe
  • unauthorised overtime, authorise
  • junior staff paying, authorise payment lists
  • unauthorised departmental lists, authorise
  • weak passwords, strong and changed
  • leaver e-mails, number and confirm

(1.4 each)

Show the model answer to Question 13

Payment: authorised payment lists; timetable and procedures for paying deductions; bank statements checked to records; reconciliation of payable to paid. (3) Recording: approved payroll data; strict timescale; control accounts with regular reconciliation. (2)

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All Audit, Assurance and Forensics topics

You are reading topic 37 of 67.

  1. Meaning and objectives of audit, the need for audit and types of audit01
  2. Assurance engagements, levels of assurance and sustainability assurance02
  3. Statutory audit and the legal framework: CAMA 2020 and the FRC Act03
  4. International standards on auditing, assurance engagements and Nigerian standards04
  5. Obtaining and accepting a new audit engagement05
  6. Engagement letters: agreeing the terms of an audit engagement (ISA 210)06
  7. Fundamental ethical principles and the conceptual framework07
  8. Independence, objectivity and integrity of the auditor08
  9. Confidentiality in audit and assurance engagements09
  10. Conflicts of interest and resolving ethical conflicts10
  11. Non-compliance with laws and regulations (NOCLAR) and whistleblowing11
  12. Public interest and professional scepticism in audit and assurance12
  13. Rules-based and principles-based ethics, and ethics in governance13
  14. Internal audit: concept, role and its place in internal control14
  15. Internal audit compared with external audit15
  16. Operational and other internal audit assignments16
  17. Internal audit reports, regulation, ethics and outsourcing17
  18. Planning an audit (ISA 300)18
  19. Understanding the entity, its environment and its laws (ISA 315 and ISA 250)19
  20. Materiality in planning and performing an audit (ISA 320)20
  21. Audit risk and the auditor\u2019s response to assessed risks (ISA 330)21
  22. Fraud and the auditor (ISA 240)22
  23. Audit of not-for-profit organisations23
  24. Public sector audit24
  25. Audit evidence (ISA 500)25
  26. Audit documentation and working papers (ISA 230)26
  27. Audit sampling (ISA 530)27
  28. Importance, objectives and types of internal control28
  29. Control environment, the risk assessment process and monitoring of controls29
  30. Control activities and IT controls30
  31. Limitations of internal control and recording control systems31
  32. Evaluating controls and assessing audit risk32
  33. Risks of specialised IT systems and information security measures33
  34. Tests of controls and the main transaction cycles34
  35. The sales system: controls and tests of controls35
  36. The purchases and expenses system: controls and tests of controls36
  37. The payroll system: controls and tests of controls37 here
  38. The bank and cash system: controls and tests of controls38
  39. The inventory and non-current asset systems: controls and tests of controls39
  40. Management letters and reporting control deficiencies40
  41. Substantive procedures: role and approach41
  42. Analytical procedures (ISA 520)42
  43. Audit of tangible non-current assets43
  44. Audit of intangible non-current assets44
  45. Inventory: valuation and the physical count (ISA 501)45
  46. Trade receivables, prepayments and external confirmations (ISA 505)46
  47. Substantive procedures on bank and cash balances47
  48. Trade payables, accruals, provisions and contingencies48
  49. Non-current liabilities, equity and directors\u2019 emoluments49
  50. Key income statement figures50
  51. Written representations (ISA 580)51
  52. Evaluating misstatements (ISA 450) and the overall review of the financial statements52
  53. Purpose of the auditor\u2019s report and the audit expectation gap53
  54. The unmodified auditor\u2019s report (ISA 700)54
  55. Key audit matters (ISA 701) and reports prescribed by law55
  56. Audit reporting under CAMA 2020 and the audit committee56
  57. Going concern (ISA 570)57
  58. Modified opinions, emphasis of matter and other matter paragraphs58
  59. Information systems audit: risks, protection and the audit process59
  60. Vulnerability audit, data centre audit, banking transactions and IT audit reports60
  61. Data analytics, artificial intelligence, blockchain and other audit technology61
  62. Nature, objectives and types of forensic accounting services62
  63. Economic damage through contract and tort63
  64. Computer forensics, fraud investigation and litigation support64
  65. Hidden assets: how forensic accountants find them65
  66. Professional negligence in forensic investigations66
  67. The expert report and reporting in forensic engagements67
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