Use these 60 concepts to connect accounting principles with calculations and professional decisions. Work through the foundations before the applications, then compare each resolved example with the mistake to avoid. Tax examples use explicitly hypothetical rules; legal examples identify matters that depend on the applicable jurisdiction.
Financial reporting foundations
1. The accounting equation and double entry
Assets equal liabilities plus equity. Every recorded transaction preserves this relationship through equal total debits and credits. A debit increases an asset or expense; a credit increases a liability, equity or income account. Identify the accounts and their changes before choosing the entries.
Worked example: A business buys equipment for 12,000, paying 4,000 immediately and owing 8,000. Debit equipment 12,000; credit cash 4,000 and payables 8,000. Net assets and liabilities both rise by 8,000.
Mistake to avoid: Treating every debit as an increase regardless of the account type.
Reference: NBAA | List of Accountancy and Audit Firms
2. Accruals and prepayments
Accrual accounting records expenses when resources are consumed, rather than simply when cash moves. An unpaid expense creates a liability; payment for a future service initially creates a prepayment. Adjustments allocate the cost to the periods receiving the benefit.
Worked example: Insurance costing 2,400 covers twelve months from 1 October. At 31 December, three months have expired: expense is 600 and the remaining prepayment is 1,800.
Mistake to avoid: Charging the full payment to expense even though most coverage belongs to the following period.
Reference: NBAA | List of Accountancy and Audit Firms
3. Revenue and performance obligations
Under the IFRS revenue model, identify the promised goods or services and recognise revenue as the relevant performance obligations are satisfied. Receipt of cash alone does not establish earned revenue. Separate obligations may require allocating the transaction price using relative stand-alone selling prices.
Worked example: A customer pays 1,000 for equipment and future servicing. Their stand-alone prices are 900 and 300. Allocate 750 to equipment and 250 to servicing; recognise each amount when its obligation is satisfied.
Mistake to avoid: Recognising the entire receipt when equipment delivery leaves an unsatisfied service obligation.
Reference: NBAA | List of Accountancy and Audit Firms
4. Inventory cost and net realisable value
Under IFRS, inventory is measured at the lower of cost and net realisable value. Net realisable value is the estimated selling price less completion and selling costs. Assess recoverability using the relevant items or appropriate groups, rather than offsetting unrelated gains and losses.
Worked example: An item costs 75, could sell for 82, and requires 12 of completion and selling costs. Its net realisable value is 70, so its carrying amount falls to 70.
Mistake to avoid: Comparing cost with the selling price without deducting the remaining costs.
Reference: NBAA | List of Accountancy and Audit Firms
5. Depreciation and depreciable amount
Depreciation allocates an asset’s depreciable amount over its useful life; it does not measure its market value. Depreciable amount is cost less residual value. The method should reflect the consumption pattern, and depreciation generally begins when the asset is available for use.
Worked example: Equipment costs 26,000, has a residual value of 2,000 and a six-year useful life. Straight-line depreciation for a full year is (26,000 − 2,000) ÷ 6 = 4,000.
Mistake to avoid: Depreciating the full cost while ignoring a material residual value.
Reference: NBAA | List of Accountancy and Audit Firms
6. Impairment and recoverable amount
Under IFRS, an asset is impaired when its carrying amount exceeds its recoverable amount. Recoverable amount is the higher of value in use and fair value less costs of disposal. When independent cash flows cannot be identified, assessment may be necessary at cash-generating-unit level.
Worked example: A machine carries at 48,000. Value in use is 42,000 and fair value less disposal costs is 39,000. Recoverable amount is 42,000, producing an impairment loss of 6,000.
Mistake to avoid: Using the lower of the two recoverable-amount measures.
Reference: NBAA | List of Accountancy and Audit Firms
7. Provisions and contingent liabilities
Under IFRS, recognise a provision for a present obligation from a past event when an outflow is probable and a reliable estimate can be made. A possible obligation generally requires contingent-liability disclosure unless the outflow is remote. Future operating intentions alone do not create present obligations.
Worked example: A business has a present legal obligation, a probable payment and a reliable estimate of 18,000. It recognises a provision. A separate possible claim requires assessment for disclosure rather than automatic recognition.
Mistake to avoid: Creating a provision merely because management expects future expenditure.
Reference: NBAA | List of Accountancy and Audit Firms
8. Profit and operating cash flow
Profit includes accruals and non-cash charges, so it differs from cash generated by operations. In a simplified indirect reconciliation, add back non-cash expenses, subtract increases in operating receivables and inventory, and add increases in operating payables. Other adjustments may be necessary.
Worked example: Starting profit is 20,000, depreciation is 3,000, receivables increase by 4,000 and payables increase by 1,000. With no other adjustments, operating cash flow is 20,000 + 3,000 − 4,000 + 1,000 = 20,000.
Mistake to avoid: Adding an increase in receivables as though customers had paid cash.
Reference: NBAA | List of Accountancy and Audit Firms
9. Accounting estimates and prior-period errors
An estimate changes when new information improves a previous reasonable assessment. An error arises from incorrect use or omission of information available when statements were prepared. Under IFRS, estimate changes generally affect current and future periods; material prior-period errors generally require retrospective correction, subject to practicability.
Worked example: New engineering evidence shortens an asset’s remaining useful life. This is an estimate change. Discovering that last year’s depreciation formula omitted an asset is an error.
Mistake to avoid: Calling every revision an estimate change to avoid considering prior-period correction.
Reference: NBAA | List of Accountancy and Audit Firms
10. Consolidation and acquisition goodwill
Consolidation presents a parent and its controlled subsidiaries as one economic entity. Eliminate intragroup balances and transactions. In a simplified acquisition, goodwill equals consideration plus measured non-controlling interests, less the fair value of identifiable net assets; previously held interests require an additional adjustment when applicable.
Worked example: Consideration is 800, measured non-controlling interests are 200, and identifiable net assets are 900. With no previously held interest, goodwill is 800 + 200 − 900 = 100.
Mistake to avoid: Adding subsidiary accounts without eliminating amounts owed between group companies.
Reference: NBAA | List of Accountancy and Audit Firms
Audit and assurance decisions
11. Financial statement assertions
Assertions identify what could be wrong with a balance, transaction or disclosure. Existence asks whether recorded items are real; completeness asks whether required items are missing. Valuation, rights and obligations, accuracy, cutoff and presentation address different risks and require appropriately directed procedures.
Worked example: Tracing listed inventory to the warehouse tests existence. Selecting warehouse items and tracing them into inventory records tests completeness. The starting point determines which risk the procedure addresses.
Mistake to avoid: Assuming one tracing direction establishes both existence and completeness.
Reference: NBAA | List of Accountancy and Audit Firms
12. Sufficient appropriate audit evidence
Sufficiency concerns the quantity of evidence; appropriateness concerns its relevance and reliability. More weak evidence cannot necessarily compensate for poor quality. Reliability depends on circumstances, including source independence, controls over production and whether the auditor obtains the evidence directly.
Worked example: A customer confirmation provides evidence about a receivable balance. A later bank receipt can corroborate collection, but an internally prepared list alone offers weaker support for the customer’s obligation.
Mistake to avoid: Treating management’s explanation as sufficient merely because it sounds plausible.
Reference: NBAA | List of Accountancy and Audit Firms
13. Materiality by size and nature
A misstatement is material when it could reasonably influence users’ decisions. Amount matters, but so do nature and circumstances. Performance materiality is set below overall materiality to address the risk that aggregate uncorrected and undetected misstatements exceed overall materiality; it is not a universal percentage.
Worked example: An omitted related-party transaction may warrant attention despite its small amount because the relationship affects users’ interpretation. A large routine posting error must also be evaluated quantitatively.
Mistake to avoid: Dismissing every item below a numerical threshold without considering its nature.
Reference: NBAA | List of Accountancy and Audit Firms
14. Audit risk and detection risk
Audit risk reflects the risk of an inappropriate opinion on materially misstated statements. Inherent and control risks form the risk of material misstatement. Detection risk concerns audit procedures failing to detect that misstatement. Higher assessed misstatement risk generally requires more persuasive evidence and lower acceptable detection risk.
Worked example: Complex revenue estimates combined with weak review controls increase assessed risk. The auditor responds with stronger testing of assumptions, underlying data and contradictory evidence.
Mistake to avoid: Reducing substantive work simply because the account balance appears commercially reasonable.
Reference: NBAA | List of Accountancy and Audit Firms
15. Control design and operating effectiveness
A control must be capable of addressing the relevant risk, implemented, and operating consistently when reliance is planned. Understanding a control’s design differs from testing its operation. Inquiry alone ordinarily does not establish that a control worked throughout the period.
Worked example: A payment policy requires independent approval. Inspecting the policy establishes the intended design; examining approvals on payments across the relevant period tests whether the control actually operated.
Mistake to avoid: Treating the existence of a written policy as proof of effective control.
Reference: NBAA | List of Accountancy and Audit Firms
16. Substantive procedures matched to risks
Substantive procedures detect material misstatements through tests of details or substantive analytical procedures. Match the procedure to the specific assertion and risk. A document can support one assertion while providing little evidence about another, particularly when timing or ownership is disputed.
Worked example: For sales cutoff, compare dispatch evidence and transfer terms around year-end with recorded sales dates. An invoice dated before year-end does not alone establish that revenue belongs in that period.
Mistake to avoid: Selecting convenient documents without explaining which assertion they test.
Reference: NBAA | List of Accountancy and Audit Firms
17. Audit sampling and population definition
Sampling examines less than an entire population to support conclusions about it. Define the population, sampling unit and objective before selection. Sampling risk remains because the sample may differ from the population. Deliberately selecting unusual items is useful targeted testing but does not automatically support population-wide projection.
Worked example: Testing all unusually large invoices can address specific risks. A separate representative sample of the remaining invoices is needed if the objective includes drawing conclusions about that remaining population.
Mistake to avoid: Projecting errors from a deliberately biased selection as though it were representative.
Reference: NBAA | List of Accountancy and Audit Firms
18. Analytical procedures and expectations
Analytical procedures compare recorded amounts with plausible relationships or independently developed expectations. Their usefulness depends on data reliability, predictability and sufficient precision. An unexpected difference prompts investigation; it does not by itself prove an error or establish its cause.
Worked example: A warehouse’s average monthly rent is 5,000 under an unchanged contract. Expected annual rent is 60,000. A recorded expense of 75,000 requires investigation into additional premises, adjustments or misclassification.
Mistake to avoid: Accepting a broad explanation without corroborating the cause of the difference.
Reference: NBAA | List of Accountancy and Audit Firms
19. Going concern and uncertainty
Going-concern assessment considers whether the entity can continue operating and whether material uncertainty needs disclosure. Cash shortages, financing conditions and realistic management plans matter. A loss is a warning indicator, rather than automatic proof that the going-concern basis is inappropriate.
Worked example: A company forecasts a cash deficit but relies on refinancing. An unsigned financing proposal provides weaker support than a binding facility whose conditions the company can meet.
Mistake to avoid: Treating management’s intention to obtain funding as evidence that funding is available.
Reference: NBAA | List of Accountancy and Audit Firms
20. Modified opinions and pervasiveness
Distinguish identified misstatements from inability to obtain sufficient appropriate evidence. A material but non-pervasive matter generally leads to a qualified opinion. Material pervasive misstatement leads to an adverse opinion; material pervasive possible effects from unavailable evidence lead to a disclaimer.
Worked example: Records for a material but isolated inventory balance are unavailable. If possible effects are not pervasive, qualification is appropriate. If unavailable evidence affects much of the statements, a disclaimer may be necessary.
Mistake to avoid: Choosing an adverse opinion solely because evidence is unavailable.
Reference: NBAA | List of Accountancy and Audit Firms
Taxation foundations
21. Accounting profit and taxable profit
Taxable profit is determined under applicable tax law, rather than copied directly from accounting profit. A reconciliation identifies items treated differently, including disallowed expenses and statutory deductions. Each adjustment needs a legal basis for the relevant taxpayer, jurisdiction and period.
Worked example: Assume a hypothetical law disallows a 2,000 penalty and grants an additional 3,000 deduction. Accounting profit of 40,000 becomes taxable profit of 40,000 + 2,000 − 3,000 = 39,000.
Mistake to avoid: Assuming every accounting expense is deductible for tax.
Reference: NBAA | List of Accountancy and Audit Firms
22. Capital expenditure and operating expenditure
Expenditure creating a lasting asset differs economically from expenditure maintaining current operations. Tax law may apply its own classification and deduction rules. Consider the substance of the work, the benefit created and the applicable legislation; neither the invoice label nor payment size settles the treatment.
Worked example: Replacing a worn component to restore existing output differs from adding a production line that increases capacity. Under a hypothetical law requiring capital additions to be relieved over time, the new line receives that treatment.
Mistake to avoid: Assuming all spending described as repairs qualifies for immediate tax deduction.
Reference: NBAA | List of Accountancy and Audit Firms
23. Tax allowances versus accounting depreciation
Accounting depreciation allocates an asset’s cost for reporting. Tax depreciation or capital allowances follow statutory rules, which may use different rates, bases and eligibility conditions. A tax reconciliation may remove accounting depreciation and insert the permitted tax deduction instead.
Worked example: Assume accounting profit of 50,000 includes depreciation of 6,000, while a hypothetical tax law permits an allowance of 9,000. Adjusted profit is 50,000 + 6,000 − 9,000 = 47,000.
Mistake to avoid: Deducting both accounting depreciation and the tax allowance when only the allowance is permitted.
Reference: NBAA | List of Accountancy and Audit Firms
24. Marginal and effective tax rates
A marginal rate applies to an additional amount of taxable income. An effective rate compares total tax with the chosen income measure. Under a banded system, each slice is taxed at its own rate; crossing a threshold does not necessarily subject all income to the highest rate.
Worked example: In a hypothetical system, the first 10,000 is taxed at 10% and the next 5,000 at 20%. Tax on 15,000 is 2,000; the effective rate is 13.33% and the marginal rate is 20%.
Mistake to avoid: Applying the highest band’s rate to the entire income.
Reference: NBAA | List of Accountancy and Audit Firms
25. Value added tax and recoverable input tax
In a credit-invoice VAT system, output tax on taxable sales is generally offset by eligible input tax. Recovery depends on applicable rules, including use, documentation and restrictions. Distinguish tax-exclusive prices from tax-inclusive amounts before calculating the tax component.
Worked example: Assume a hypothetical 15% rate and full input recovery. Sales of 20,000 excluding VAT generate 3,000 output tax; purchases of 8,000 excluding VAT generate 1,200 input tax. Net VAT is 1,800.
Mistake to avoid: Offsetting all purchase tax without checking recovery eligibility.
Reference: NBAA | List of Accountancy and Audit Firms
26. Withholding tax and payment settlement
Withholding separates an amount deducted by the payer from the cash remitted to the recipient. Whether the deduction is creditable, final or otherwise treated depends on the applicable law. Reconcile gross income, withheld tax and net cash instead of confusing cash received with gross earnings.
Worked example: Assume a payment of 5,000 is subject to hypothetical 10% creditable withholding. The recipient receives 4,500 and has 500 withheld for potential credit, subject to the law and supporting documentation.
Mistake to avoid: Recording only 4,500 as gross income because that is the cash received.
Reference: NBAA | List of Accountancy and Audit Firms
27. Tax losses and permitted relief
An accounting loss does not automatically equal a tax loss. Tax adjustments must be applied first, and relief may be restricted by time, activity, ownership or other statutory conditions. Use only the losses eligible for the particular period and taxpayer.
Worked example: Assume a hypothetical law allows an eligible carried-forward loss of 12,000 to offset current taxable profit without further restriction. Current profit of 30,000 falls to 18,000 after relief.
Mistake to avoid: Using the full accounting loss without establishing the tax loss and applicable relief conditions.
Reference: NBAA | List of Accountancy and Audit Firms
28. Tax residence and income source
Residence and source are separate connecting factors in taxation. Residence may affect the range of income considered, while source connects income to a location or activity. Applicable domestic rules and treaties determine the outcome; citizenship, payment currency and bank location alone are insufficient conclusions.
Worked example: A consultant lives in one country, works temporarily in another and receives payment into a third-country account. Analyse residence and service-source rules separately; the receiving bank does not settle the tax position.
Mistake to avoid: Assuming income is taxable only where the payment arrives.
Reference: NBAA | List of Accountancy and Audit Firms
29. Temporary differences and deferred tax
Under IFRS, deferred tax addresses qualifying differences between an asset or liability’s carrying amount and tax base. An asset carrying above its tax base commonly creates a taxable temporary difference, subject to recognition exceptions. Permanent differences do not reverse and therefore do not themselves create deferred tax.
Worked example: An asset carries at 18,000 and has a tax base of 12,000. Assuming recognition applies and a hypothetical applicable rate of 25%, the deferred tax liability is 6,000 × 25% = 1,500.
Mistake to avoid: Recognising deferred tax on a permanently disallowed expense merely because it increases current tax.
Reference: NBAA | List of Accountancy and Audit Firms
30. Tax records and reconciliation
A defensible tax calculation connects accounting records to adjustments, supporting documents and applicable rules. Reconcile opening balances, transactions, payments and closing amounts. Evidence of payment and evidence of deductibility serve different purposes; the latter may require additional information about the transaction.
Worked example: An expense appears in the ledger and bank statement, but its business purpose is unclear. Payment is established; deductibility remains unresolved until the transaction and relevant rule are supported.
Mistake to avoid: Treating a bank transfer as sufficient proof of tax deductibility.
Reference: NBAA | List of Accountancy and Audit Firms
Management accounting and performance
31. Cost behaviour and the relevant range
Variable costs change with activity in total, while fixed costs remain broadly constant within a relevant range and period. Mixed costs contain both components. Fixed cost per unit falls as output rises, but this does not mean the total fixed cost has become variable.
Worked example: Monthly fixed costs are 12,000 and variable cost is 7 per unit. At 2,000 units, total cost is 26,000; at 3,000 units, it is 33,000, assuming capacity and cost relationships remain unchanged.
Mistake to avoid: Extending a linear cost model beyond the capacity range it describes.
Reference: NBAA | List of Accountancy and Audit Firms
32. Absorption and marginal costing
Absorption costing includes allocated fixed production overhead in inventory. Marginal costing expenses that fixed production overhead in the period. When inventory changes, profit can differ because fixed overhead is either deferred in inventory or released from it. Use consistent assumptions when reconciling the results.
Worked example: Assume fixed production overhead is absorbed at 4 per unit and inventory increases by 300 units. With no other differences, absorption profit exceeds marginal profit by 300 × 4 = 1,200.
Mistake to avoid: Interpreting the profit difference as extra cash generated by production.
Reference: NBAA | List of Accountancy and Audit Firms
33. Contribution and break-even analysis
Contribution equals sales less variable costs and first covers fixed costs before generating profit. Break-even units equal fixed costs divided by contribution per unit. The model assumes stable prices and unit costs, a relevant activity range and, for multiple products, an appropriate sales-mix assumption.
Worked example: Price is 25, variable cost is 15 and fixed costs are 18,000. Contribution is 10 per unit, so break-even output is 1,800 units. At 2,200 units, profit is 4,000.
Mistake to avoid: Using selling price instead of contribution as the break-even denominator.
Reference: NBAA | List of Accountancy and Audit Firms
34. Relevant costs and opportunity costs
A relevant cost is a future cash flow that differs between alternatives. Sunk costs do not change with the decision. Opportunity cost is the benefit sacrificed by choosing one option, and it can matter even when no payment is recorded in the accounts.
Worked example: A special order earns 9,000 and requires 5,000 additional expenditure. If it displaces work contributing 3,000, its incremental benefit is 9,000 − 5,000 − 3,000 = 1,000.
Mistake to avoid: Ignoring displaced contribution because it does not appear as an invoice.
Reference: NBAA | List of Accountancy and Audit Firms
35. Production under a limiting factor
When one resource limits output, rank products by contribution per unit of that scarce resource, subject to demand and operational constraints. Contribution per product alone can mislead. Where several constraints bind simultaneously, a simple ranking may not identify the optimal production mix.
Worked example: Product A contributes 30 and uses three machine hours; B contributes 24 and uses one hour. Their contributions per hour are 10 and 24, so prioritise B within its demand limit.
Mistake to avoid: Prioritising A solely because its contribution per unit is higher.
Reference: NBAA | List of Accountancy and Audit Firms
36. Flexible budgets and activity effects
A flexible budget recalculates expected revenue and costs for the actual activity level. This separates activity differences from spending or efficiency effects. Fixed costs remain unchanged only within the relevant range; variable costs follow the chosen activity driver.
Worked example: Budgeted variable cost is 6 per unit and fixed cost is 8,000. At actual output of 1,500 units, the flexible cost budget is 17,000. Actual cost of 17,900 indicates 900 adverse expenditure against that benchmark.
Mistake to avoid: Comparing actual costs with an unchanged budget for a different output level.
Reference: NBAA | List of Accountancy and Audit Firms
37. Material price and usage variances
Price variance compares actual price with standard price for the relevant actual quantity. Usage variance compares actual consumption with standard consumption allowed for actual output, valued at standard price. Define whether price variance is measured on purchases or usage before interpreting the results.
Worked example: Using consumption-based price variance, 520 kg costs 4.20 per kg against a 4.00 standard. Price variance is 104 adverse. Standard consumption is 500 kg, so usage variance is 80 adverse.
Mistake to avoid: Calculating usage variance against the original budget’s output rather than actual output.
Reference: NBAA | List of Accountancy and Audit Firms
38. Activity-based costing and cost drivers
Activity-based costing groups overhead into activity pools and allocates each pool using a driver associated with resource consumption. It can reveal differences hidden by a single volume-based rate. A useful driver should explain the activity’s cost behaviour, rather than merely be easy to count.
Worked example: A setup pool costs 60,000 for 120 setups, giving 500 per setup. A product requiring eight setups receives 4,000 of setup cost, regardless of its number of units.
Mistake to avoid: Allocating setup costs by output volume when setup frequency drives resource use.
Reference: NBAA | List of Accountancy and Audit Firms
39. Net present value and incremental cash flows
Net present value discounts incremental project cash flows at an appropriate required return and subtracts the initial investment. Include relevant working-capital movements and terminal cash flows. Depreciation itself is non-cash, although its tax consequences may affect cash flows when applicable rules are specified.
Worked example: A project costs 10,000 now and returns 6,000 at each of the next two year-ends. At 10%, NPV is −10,000 + 6,000 ÷ 1.1 + 6,000 ÷ 1.1² = approximately 413.22.
Mistake to avoid: Discounting accounting profit instead of incremental project cash flows.
Reference: NBAA | List of Accountancy and Audit Firms
40. Return on investment and residual income
Return on investment divides an appropriately defined profit by investment. Residual income deducts a capital charge from profit. ROI can discourage a manager from accepting a project that reduces the division’s percentage return despite exceeding the required return; residual income helps reveal that conflict.
Worked example: A division earns 30% ROI. A proposed 100,000 project earns 20,000, or 20%, against a 12% required return. It adds 8,000 residual income even though it could reduce divisional ROI.
Mistake to avoid: Rejecting every project below the division’s existing ROI.
Reference: NBAA | List of Accountancy and Audit Firms
Business law and corporate governance foundations
41. Identifying the applicable legal rule
A legal conclusion requires the relevant jurisdiction, legal issue and authoritative rule. Legislation, regulations, judicial decisions and contractual terms can serve different functions. Guidance may explain a rule without creating legal authority. Check effective dates and the relationship between sources rather than applying an isolated quotation.
Worked example: A contract specifies a payment date, while a blog describes a different customary period. Start with the contract and applicable law; the blog alone cannot establish which obligation governs.
Mistake to avoid: Treating explanatory commentary as though it overrides applicable law.
Reference: NBAA | List of Accountancy and Audit Firms
42. Separate legal personality
Where the applicable law gives a company separate legal personality, its property and obligations belong to the company rather than automatically to its owners. Keep company transactions distinct from owners’ personal transactions. Other business structures may operate differently and require their own analysis.
Worked example: A shareholder personally owns a vehicle used occasionally by a company. Its use does not automatically make it company property; ownership and the arrangement must be established before recording a company asset.
Mistake to avoid: Treating every asset controlled personally by an owner as a company asset.
Reference: NBAA | List of Accountancy and Audit Firms
43. Limited liability and personal commitments
Limited liability concerns owners’ exposure under the relevant business form and law. It does not mean every participant is protected from every obligation. A personal guarantee creates a separate commitment whose terms require examination, and statutory exceptions may also apply.
Worked example: A lender requests a shareholder’s guarantee for a company loan. The shareholder must assess that separate undertaking; the company’s limited-liability form does not itself answer the guarantee’s consequences.
Mistake to avoid: Assuming incorporation makes signing a personal guarantee economically harmless.
Reference: NBAA | List of Accountancy and Audit Firms
44. Agreement and enforceability
Commercial agreement and legal enforceability are related but distinct. Analyse what was offered, what was accepted, the parties’ capacity and authority, and any required formalities under applicable law. Do not assume identical contract-formation requirements across jurisdictions or that every informal promise creates an enforceable contract.
Worked example: A supplier offers delivery on Monday. The buyer responds with acceptance only if delivery occurs Friday. Identify the changed term and seek clear agreement rather than assuming the original offer was accepted unchanged.
Mistake to avoid: Ignoring a material change in the purported acceptance.
Reference: NBAA | List of Accountancy and Audit Firms
45. Agency and authority
An agent acts for a principal, but the principal’s exposure depends on authority and applicable law. Distinguish internal authorisation from representations made to outsiders. Internal limits, apparent authority and later ratification can raise different questions; establish the facts before reaching a legal conclusion.
Worked example: A purchasing employee has an internal limit of 5,000 but orders goods worth 9,000. Investigate their actual authority and the company’s representations to the supplier before deciding whether the company is bound.
Mistake to avoid: Assuming an undisclosed internal limit automatically resolves the supplier’s rights.
Reference: NBAA | List of Accountancy and Audit Firms
46. Directors’ conflicts of interest
A conflict arises when a decision-maker’s personal interest may interfere with responsibilities to the organisation. Good governance requires identifying the interest and applying the relevant disclosure, approval and participation rules. Disclosure alone does not automatically make every transaction permissible or fair.
Worked example: A director’s sibling owns a proposed supplier. The relationship should be declared and the applicable approval process followed, with independent evaluation of price and quality before a decision.
Mistake to avoid: Assuming a competitive price removes the need to address the conflict.
Reference: NBAA | List of Accountancy and Audit Firms
47. Board oversight and management responsibility
Boards generally oversee strategy, accountability and risk, while management runs operations within delegated authority. Exact responsibilities depend on law and governing documents. Effective oversight requires useful reporting and challenge; delegation of operational work should not be confused with the disappearance of oversight responsibilities.
Worked example: Management negotiates a major expansion within its remit. The board examines assumptions, funding and risk before approving matters reserved to it, then monitors performance against the approved plan.
Mistake to avoid: Treating receipt of management reports as sufficient oversight without examining their implications.
Reference: NBAA | List of Accountancy and Audit Firms
48. Segregation of duties and compensating controls
Separating authorisation, custody, recording and reconciliation reduces opportunities to commit and conceal errors or fraud. Small organisations may lack enough staff for full separation, so compensating controls should target the resulting risks. A second signature has little value if the reviewer lacks information or independence.
Worked example: One employee prepares supplier payments and records them. An owner independently checks supporting invoices and bank statements, including changes to supplier bank details, rather than merely signing the payment list.
Mistake to avoid: Calling a rubber-stamp approval an effective compensating control.
Reference: NBAA | List of Accountancy and Audit Firms
49. Inherent risk and residual risk
In enterprise risk management, inherent risk is assessed before considering controls; residual risk remains after their effect. Evaluate likelihood and impact, then compare the remaining exposure with the organisation’s risk appetite. A control’s existence does not prove it reduces risk to an acceptable level.
Worked example: Backups reduce potential data-loss impact only if restoration is possible. A failed restoration test shows residual risk remains high and calls for corrective action and renewed testing.
Mistake to avoid: Lowering the risk assessment solely because a control is documented.
Reference: NBAA | List of Accountancy and Audit Firms
50. Liquidity and solvency
Liquidity concerns meeting obligations as they fall due. Solvency concerns financial viability and obligations, with legal tests varying by jurisdiction. Positive net assets do not ensure enough immediately available cash, and a temporary cash shortage does not alone establish the applicable legal insolvency conclusion.
Worked example: A company owns property worth 500,000 but has only 2,000 cash against a payment of 20,000 due tomorrow. Asset value does not resolve the immediate 18,000 funding gap.
Mistake to avoid: Using a positive balance-sheet total as proof that all near-term debts can be paid.
Reference: NBAA | List of Accountancy and Audit Firms
Ethics and professional judgment
51. Integrity and misleading information
Integrity requires honesty and straightforward dealing. Information can mislead through omission as well as an explicitly false statement. Consider the overall impression created, investigate misleading presentation and take appropriate steps to correct it or avoid association with it.
Worked example: A performance report shows sales growth but omits a major return that reverses that growth. Adding the return and explaining its effect produces a more faithful account of performance.
Mistake to avoid: Defending a misleading report because each included sentence is technically true.
Reference: NBAA | List of Accountancy and Audit Firms
52. Objectivity and self-interest
Objectivity requires judgment free from bias, conflicts and undue influence. Financial incentives can create self-interest threats even without deliberate dishonesty. Identify how an interest could affect the decision, assess its significance and consider safeguards, reassignment or withdrawal where necessary.
Worked example: An accountant’s bonus depends on reported profit while they assess a doubtful receivable. Independent review of the estimate helps address the incentive, but evidence must still support the final amount.
Mistake to avoid: Assuming awareness of a personal bias automatically neutralises it.
Reference: NBAA | List of Accountancy and Audit Firms
53. Professional competence and due care
Competence means having the knowledge and skill needed for the work; due care means applying them diligently. Recognise the limits of your expertise, obtain appropriate assistance and allow adequate resources. A client’s willingness to accept weak work does not make unsupported conclusions professionally sound.
Worked example: An accountant is asked to value a complex financial instrument outside their expertise. They obtain qualified assistance and evaluate the resulting evidence before using the valuation.
Mistake to avoid: Presenting an unfamiliar calculation as reliable because software produced a number.
Reference: NBAA | List of Accountancy and Audit Firms
54. Confidentiality and authorised disclosure
Confidentiality restricts improper use and disclosure of information gained professionally. It continues beyond the engagement. Disclosure may be authorised or required under applicable duties and law, so assess the basis and appropriate recipient rather than applying either absolute secrecy or casual sharing.
Worked example: A former colleague asks for a client’s unpublished results. Without a proper authorisation or other valid disclosure basis, the accountant does not share them or use them for personal benefit.
Mistake to avoid: Assuming confidentiality ends when employment or an engagement finishes.
Reference: NBAA | List of Accountancy and Audit Firms
55. Professional behaviour and accurate representations
Professional behaviour includes complying with applicable obligations and avoiding conduct that discredits professional work. Claims about qualifications, services and results should be accurate and supportable. Distinguish what you performed from what was independently verified, and avoid implying endorsement or certainty that does not exist.
Worked example: A firm prepared accounts but did not audit them. Its proposal accurately describes preparation services and does not describe the accounts as audited or independently assured.
Mistake to avoid: Using assurance language to make a service appear more authoritative than it is.
Reference: NBAA | List of Accountancy and Audit Firms
56. Independence of mind and appearance
For engagements requiring independence, consider both actual impartial judgment and how circumstances would appear to a reasonable, informed observer. A relationship can create a threat despite confidence in personal honesty. Apply the relevant independence requirements before deciding whether safeguards or disengagement are necessary.
Worked example: An assurance team member holds a financial interest in the client. Personal confidence is insufficient; the interest must be evaluated under the applicable rules and resolved before relying on that person’s participation.
Mistake to avoid: Equating independence solely with the absence of deliberate bias.
Reference: NBAA | List of Accountancy and Audit Firms
57. Self-review threats
A self-review threat arises when professional judgment depends on evaluating earlier work performed by the same person or firm. Identify the work being reviewed, its significance and applicable restrictions. Separate personnel or independent review may help in some circumstances, but cannot override a prohibition.
Worked example: A firm builds a valuation model and is later asked to provide assurance over its output. The firm assesses whether it would be checking its own judgments and whether the engagement is permitted.
Mistake to avoid: Assuming a different team automatically makes every combined service acceptable.
Reference: NBAA | List of Accountancy and Audit Firms
58. Pressure and intimidation
Pressure becomes an ethical threat when it pushes professional judgment away from evidence or applicable requirements. Identify the requested action, document relevant facts and use appropriate consultation or escalation. The response should address the substance of the pressure, rather than merely recording that it occurred.
Worked example: A manager threatens dismissal unless an unsupported asset value is retained. The accountant requests evidence, documents the disagreement and escalates through an appropriate channel rather than approving the value.
Mistake to avoid: Treating a superior’s instruction as sufficient justification for a misleading entry.
Reference: NBAA | List of Accountancy and Audit Firms
59. Gifts and inducements
An inducement can influence judgment through its purpose, timing, relationship and circumstances. Assess whether it seeks improper influence and apply relevant ethical and organisational requirements. Monetary value alone is insufficient; a modest benefit offered at a sensitive decision point can still create a significant problem.
Worked example: A supplier offers event tickets immediately before tender evaluation. The evaluator considers the timing and influence risk, declines where appropriate and records the offer through the organisation’s process.
Mistake to avoid: Assuming a gift is acceptable solely because its price is low.
Reference: NBAA | List of Accountancy and Audit Firms
60. Public interest and affected stakeholders
Professional decisions can affect investors, employees, creditors and others beyond the person paying for the service. Public-interest reasoning considers these effects alongside applicable duties, evidence and confidentiality. It does not authorise unrestricted disclosure or replace the need to follow proper reporting channels.
Worked example: An accountant finds that a lender-facing report conceals a material liability. They seek correction and consider appropriate escalation, recognising creditors’ reliance while respecting applicable disclosure obligations.
Mistake to avoid: Treating client convenience as the only relevant consequence of a reporting decision.
Reference: NBAA | List of Accountancy and Audit Firms
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