Materiality is not a single percentage pulled from a textbook. For a family-owned manufacturer, the owners often care more about whether inventory was counted honestly than about a rounding difference in deferred tax.

When we set planning materiality, we look at what the financial statements will be used for. A bank covenant keyed to interest coverage makes earnings adjustments far more sensitive than a purely internal management pack.

Owners sometimes ask us to ignore a related-party rent that sits below the calculated threshold. We still evaluate whether omission would mislead a reader who knows the family structure. Silence can be as misleading as a wrong number.

Performance materiality—the tighter figure used for sampling—matters on the warehouse floor. If count differences routinely approach that figure, we expand testing rather than waving them through.

The practical takeaway for finance managers: tell your auditors early how the statements will be read. That conversation shapes sample sizes more than any formula alone.

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