We empirically investigate how regulatory oversight on external auditors is jointly influenced by audit committee financial expertise and independence. To measure regulatory oversight on external auditors, we use comment letters issued by the Securities and Exchange Organization of Iran. We show that audit committee financial expertise increases (decreases) regulatory oversight on external auditors when audit committee independence is low (high). We further show that this interactive effect is stronger under higher regulatory reviewers’ workload compression. Collectively, our findings suggest that, first, financial expertise and independence of audit committees should be analysed together as independence moderates the benefit of financial expertise. Second, the consideration of regulatory reviewers’ workload compression is important in this analysis.

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