Purpose – The purpose of this paper is two-fold: first, to examine whether the quality of accruals, as measured by accrual persistence, improved in the post-Sarbanes-Oxley (SOX) period, and second, to examine the degree to which SOX-related improvement in accrual persistence varies across companies depending on the degree of their auditor's independence.

Design/methodology/approach – The paper compares accrual persistence in the pre- and post-SOX periods to test the first question. Then, partitioning on relative client importance as a measure of auditor independence, the paper compares the SOX-based improvement for clients of low and high independence audit firms.

Findings – The study first demonstrates that accrual persistence increased significantly in the post-SOX period. The study also finds evidence that in the post-SOX period, the subsample of companies audited by Big-N auditors with lower-independence experienced the greatest improvement in accrual persistence.

Originality/value – This is the first paper to evaluate SOX-related improvements in the quality of earnings as measured by accrual persistence. Prior studies test abnormal accruals and other earnings management metrics, however, persistence is a more general test of financial statement quality. This study also is the first to compare SOX-related improvements for clients of firms with differing levels of independence.