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What is the difference between a test of details and a substantive analytical procedure?

Intermediate

Answer

A test of details examines individual items—vouching transactions to documents, confirming balances, recalculating. A substantive analytical procedure evaluates plausibility by studying relationships among financial and non-financial data (e.g., expecting payroll to move with headcount). Tests of details give direct evidence on items; analytics give evidence about reasonableness of a total.
Real-world example The auditor estimates expected rent expense from lease terms (analytics) and also vouches selected payments to invoices (details).

Common follow-ups: When are analytics more efficient than details? | What builds a reliable expectation?