Compliance Management, Audit and Due Diligence · Audit Principles and Techniques

Audit Techniques: Vouching, Verification, Sampling and Testing

Updated 11 October 2026 · Fact-checked

Audit techniques are the procedures an auditor uses to gather audit evidence: inspection, observation, confirmation, recalculation, reperformance, analytical procedures and inquiry. Vouching checks entries against documents. Verification checks assets and liabilities. Sampling tests part of a population to conclude on the whole. You choose techniques by the risk of misstatement.

Understand Audit Techniques: Vouching, Verification, Sampling and Testing

An auditor must form an opinion on financial statements. To do that, the auditor collects audit evidence. The techniques below are the ways of collecting it. SA 500 lists inspection, observation, confirmation, recalculation, reperformance and analytical procedures, often in combination, in addition to inquiry.

Vouching means checking recorded transactions against supporting documents such as invoices, bank advices, contracts and board approvals. It mainly tests whether a transaction is real, authorised and correctly recorded. Verification is wider and concerns balance sheet items. It confirms existence, ownership (rights and obligations), valuation and proper disclosure of assets and liabilities. Inspection of a tangible asset may give reliable evidence of existence, but not necessarily of the entity's rights or its valuation (SA 500, A16).

An auditor cannot usually check everything. SA 500 (A52) gives three means of selecting items for testing: selecting all items (100% examination), selecting specific items, and audit sampling. You may use one or a combination, depending on the risk of material misstatement for the assertion, and on practicality and efficiency. Audit sampling lets the auditor draw conclusions about an entire population from testing a sample drawn from it (SA 500, A56; detailed in SA 530).

Test checking is the practical, informal use of selective checking: the auditor examines some entries and, if the results are satisfactory, relies on the rest. It works only if the sample is chosen sensibly and the internal control is sound. Routine checking means examining every entry in detail, such as casting and posting. In a large company, routine checking of everything is not practical.

Analytical procedures are evaluations of financial information through plausible relationships among financial and non-financial data. They also include investigating fluctuations or relationships that are inconsistent with other information or deviate significantly from predicted amounts (SA 500, A21; see SA 520). Inquiry is useful, but alone it ordinarily does not give sufficient evidence of the absence of material misstatement at assertion level, or of the operating effectiveness of controls (SA 500, A2).

Key rules to remember

Means of selecting items for testing: 100% examination | specific items | audit sampling; SA 500, A52. Use any one or a combination, based on risk of material misstatement and on practicality and efficiency.
Audit procedures to obtain evidence: Inspection, observation, confirmation, recalculation, reperformance, analytical procedures + inquiry; SA 500, A2. Inquiry alone ordinarily is not sufficient evidence of no material misstatement or of control operation.
Purpose of sampling: Conclusion about the whole population from a tested sample; SA 500, A56. Sampling is dealt with in SA 530.
Direction of testing: Overstatement: test recorded items. Understatement: test subsequent disbursements, unpaid invoices, supplier statements, unmatched receiving reports; SA 500, A27 uses accounts payable as the example of how relevance depends on direction.
Focus of effort: More effort where risk of material misstatement is higher; SA 200, A49: direct effort to areas most expected to contain risks, less to other areas.

How to solve Audit Techniques: Vouching, Verification, Sampling and Testing questions

Use this method for any question asking you to explain, choose or apply an audit technique.

1Identify the assertion or item in the question: transaction, balance, existence, ownership, valuation or completeness.
2Name the risk. Is the concern overstatement or understatement? This sets the direction of testing.
3Pick the technique that fits: vouching for transactions, verification for balances, confirmation for external evidence, observation for processes, analytical procedures for trends.
4Decide the selection means: 100% examination, specific items or sampling, with a reason based on risk and practicality.
5Apply it to the facts given, using the names, amounts and documents in the case.
6Say what evidence you will get and how reliable it is, noting limits such as inspection not proving ownership.
7Conclude: what the auditor does if exceptions are found, such as extending tests or discussing with management.

Quickest way: Match item to technique in one line each

When to use it: When time is short and the question asks which technique suits a given situation.

Transaction recorded: vouch it to documents.
Balance sheet item: verify existence, rights, valuation and disclosure.
Third-party balance: confirm externally.
Physical asset or process: inspect or observe.
Arithmetic: recalculate or reperform.
Trend or ratio oddity: analytical procedures, then investigate.
Large population with similar items: sampling or test checking, justified by risk.

Common mistakes in Audit Techniques: Vouching, Verification, Sampling and Testing

Treating vouching and verification as the same thing.
Both involve checking evidence, so they look alike.
Fix: Vouching starts from recorded transactions and goes to documents. Verification deals with assets and liabilities: existence, rights, valuation, disclosure.
Saying inspecting an asset proves ownership and valuation.
Seeing the asset feels like full proof.
Fix: State that inspection gives reliable evidence of existence, but not necessarily of rights and obligations or valuation (SA 500, A16). Add title deeds or invoices.
Relying on inquiry alone for control testing.
Inquiry is quick and easy.
Fix: Say inquiry alone ordinarily is not sufficient for absence of material misstatement or control effectiveness. Combine it with other procedures.
Testing recorded payables to find unrecorded liabilities.
Students forget the direction of testing.
Fix: For understatement, test subsequent disbursements, unpaid invoices, supplier statements and unmatched receiving reports (SA 500, A27).
Saying sampling is always better than 100% checking.
Sampling is the more discussed technique.
Fix: The choice depends on risk, practicality and efficiency. 100% examination or specific items may suit small populations or high-risk items.
Calling test checking random guessing.
The word 'test' hides the need for judgement.
Fix: Explain that items are chosen with reference to risk and control strength, and that errors found lead to wider testing.

Worked examples

Example 1

Explain how an auditor would test whether the accounts payable of Bharat Components Ltd are understated, and why testing the recorded payables ledger is not enough.

Show the solution

The concern is understatement, so the risk is unrecorded liabilities.
Under SA 500 (A27), relevance depends on direction of testing. Testing recorded payables suits overstatement, not understatement.
Instead, examine subsequent disbursements made after the year end.
Review unpaid invoices and suppliers' statements.
Examine unmatched receiving reports for goods received but not booked.
Conclude: any item relating to the year but unrecorded is a misstatement to be reported to management for adjustment.

Answer: For understatement, the auditor should test subsequent disbursements, unpaid invoices, suppliers' statements and unmatched receiving reports, because the recorded payables list cannot show items that were never recorded.

Example 2

During the audit of Kaveri Textiles Ltd, the auditor inspects all machinery at the Surat plant and finds it present. Is this enough evidence about the machinery? Which other techniques are needed?

Show the solution

Inspection of tangible assets may provide reliable evidence of existence (SA 500, A16).
It does not necessarily show rights and obligations, that is, ownership, or valuation.
For ownership, vouch purchase invoices, title or registration documents and check for charges.
For valuation, recalculate depreciation and check that the rate and method follow the stated policy.
For disclosure, compare the fixed asset schedule with the financial statements.
Conclude that inspection is one part of the evidence and must be combined with other procedures.

Answer: No. Inspection supports existence only. The auditor must also vouch ownership documents, recalculate depreciation for valuation and check disclosure to obtain sufficient appropriate evidence.

Exam tips

Use SA 500 vocabulary: inspection, observation, confirmation, recalculation, reperformance, analytical procedures, inquiry.
In case questions, link the technique to the assertion and the risk before naming it.
Write the three means of selection (100%, specific items, sampling) when asked about test checking or sampling.
Keep a clean contrast ready: vouching vs verification, and test checking vs routine checking.
Quote paragraph numbers only for those you are sure of, such as A2, A16, A27 and A52 of SA 500.

Practice questions from Audit Principles and Techniques

Audit Techniques: Vouching, Verification, Sampling and Testing: frequently asked questions

What is the difference between vouching and verification?

Vouching checks recorded transactions against supporting documents. Verification confirms assets and liabilities in the balance sheet, covering existence, rights, valuation and disclosure.

What is audit sampling under SA 530?

Audit sampling lets the auditor draw conclusions about an entire population by testing a sample drawn from it. SA 500 refers to SA 530 for the detail. It is one of three ways of selecting items for testing.

What is the difference between test checking and routine checking?

Routine checking examines every entry in detail. Test checking examines selected entries and relies on the result for the rest, provided the selection is sensible and controls are sound.

What are analytical procedures in audit?

They are evaluations of financial information by studying plausible relationships among financial and non-financial data. They also include investigating fluctuations that are inconsistent with other information. SA 520 gives further guidance.