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CPA AUD Assertions and Audit Evidence Practice
Assertions are the claims management makes, directly or indirectly, when it presents financial statements. Audit procedures become easier to choose when you first name the claim at risk: did a recorded sale occur, are all liabilities recorded, is inventory valued appropriately, does the client own the asset, or is a balance presented and disclosed correctly?
This is public teaching practice, separate from protected prediction reports. Use each example to explain why the procedure fits the assertion, then carry that reasoning into fresh scenarios. It is educational practice, not an official score or a guarantee of an AUD result.
Practice the skill, then review the reasoning
To test whether all pre-year-end shipments were recorded as sales, which procedure best fits?
A positive receivable confirmation is not returned after follow-up. What is the most useful next procedure?
An auditor examines 45 shipping documents selected for a cutoff test and finds 3 that were recorded in the wrong accounting period. Enter the sample exception rate.
Start with the assertion, not the procedure
Existence or occurrence asks whether recorded assets, liabilities, or transactions are real. Completeness asks whether everything that should be recorded is included. Valuation or allocation asks whether recorded amounts are appropriate. Rights and obligations asks whether the entity owns or controls an asset and owes a liability. Presentation and disclosure asks whether classification and notes are proper.
A fact pattern can involve more than one assertion, but choose the assertion most directly exposed. Obsolete inventory is usually valuation. Goods held for another company may exist physically but raise rights and obligations. A loan recorded in the wrong current/noncurrent category is a presentation and disclosure issue.
Use testing direction to target overstatement or understatement
Vouching starts with what the client recorded and moves backward to source evidence. For a recorded sale, move from the sales journal to an order, shipping record, and invoice. That direction asks whether a recorded transaction occurred and helps address overstatement.
Tracing starts with a source document and moves forward to the records. For completeness of sales, start with bills of lading and trace to the sales journal. For unrecorded liabilities, start with post-year-end cash disbursements or receiving reports and look for obligations that existed at year-end but were omitted.
Choose evidence that is relevant and reliable
Evidence must relate to the assertion. A physical inspection of a recorded machine supports existence, but it does not by itself prove the client owns it or that depreciation is accurate. A supplier confirmation may support a payable balance, while subsequent payment may support the existence and amount of a liability.
Source and method affect reliability. Direct evidence from a knowledgeable independent source is generally more reliable than internal oral inquiry. Company-generated reports can be useful, but the auditor needs to evaluate their accuracy, completeness, and precision. Observation shows what happened at one time and can change behavior, so it often needs corroboration.
Turn an evidence result into the next audit decision
A confirmation exception, unexplained analytical difference, or missing approval is not automatically a final conclusion. First investigate the cause. Then decide whether it indicates a misstatement, a control deficiency, a data-quality problem, or a need for additional procedures. Keep the assertion in view so that the follow-up addresses the real risk.
For sampling, evaluate results against the objective and tolerable misstatement or deviation expectations. A sample finding may need projection to the population and consideration of sampling risk. Avoid declaring a population clean based only on a small finding or treating a single exception as proof of a pervasive error without further evidence.
Questions about this practice
Does physical inspection prove every inventory assertion?
No. Inspecting recorded goods can support existence, but it may not prove ownership, completeness, or valuation. Match the procedure to the assertion you need to test.
When should I trace instead of vouch?
Trace from source documents to the ledger when you are looking for omissions and testing completeness. Vouch from recorded amounts to source documents when you are testing whether recorded items occurred or exist.
Is management inquiry enough to prove a control operated?
Usually not. Inquiry can explain the control, but auditors generally corroborate it through inspection, observation, reperformance, or other evidence.
What makes a confirmation more persuasive?
The auditor maintains control over selection, sending, and receiving, and evaluates the response source and any exceptions. A positive nonresponse needs follow-up and often alternative procedures.
References
- AICPA: Learn what is tested on the CPA Exam
- PCAOB AS 1105: Audit Evidence
- PCAOB AS 2310: The Auditor’s Use of Confirmation
- PCAOB AS 2315: Audit Sampling
- PCAOB AS 2501: Auditing Accounting Estimates
Updated October 25, 2026 · PassPredictor