This article investigates the effect of the Financial Reporting Act of 1993 (FRA) on mandatory disclosure practices of companies listed on the New Zealand Exchange Limited. The FRA gave statutory backing to financial reporting standards in New Zealand and made non‐compliance illegal. Using both univariate and multivariate analyses, we examine the association between (a) the levels of compliance with mandatory disclosure by the companies in our sample, and (b) disclosure regulatory regimes that prevailed in New Zealand before and after the implementation of the FRA. We find that mean corporate disclosure compliance levels in the periods after the enactment of the FRA are significantly higher than those in the periods before the enactment of the legislation. After controlling for the effects of other mandatory disclosure‐related variables documented in prior studies, we also find that the improvement in corporate disclosure compliance behaviour is the result of the implementation of the FRA. Alternative specifications of the primary regression model indicate that those findings are robust.