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More than 120 countries require or permit the use of International Financial Reporting Standards (IFRS) by publicly listed companies on the basis of higher information quality and accounting comparability from IFRS application. However, the empirical evidence about these presumed benefits is often conflicting and fails to distinguish between information quality and comparability. In this paper we examine the effect of mandatory IFRS adoption on firms’ information environment. We find that after mandatory IFRS adoption consensus forecast errors decrease for firms that mandatorily adopt IFRS relative to forecast errors of other firms. We also find decreasing forecast errors for voluntary adopters, but this effect is smaller and not robust. Moreover, we show that the magnitude of the forecast error decrease is associated with the firm-specific differences between local GAAP and IFRS. This finding suggests that it is IFRS adoption rather than a correlated unobservable factor that is causing forecast errors to decrease. Exploiting individual analyst level data and isolating settings where analysts would benefit more from either increased comparability or higher quality information, we document that the improvement in the information environment is driven both by information and comparability effects. These results suggest that mandatory IFRS adoption has improved the quality of information intermediation in capital markets, and as a result firms’ information environment, by increasing both information quality and accounting comparability.