“Auditors may confuse performance materiality with tolerable misstatement. Tolerable misstatement is referred to in ISA 530 Audit sampling and is an example of performance materiality when applied to the selection and evaluation of results when sampling. However, performance materiality is also used for other things at the planning stage. It is also a reference point when evaluating the results of other (non-sampling) substantive analytical procedures.”
Source: ICAEW Materiality in the audit of financial statements