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The present study investigated the impact of earnings volatility and environmental uncertainty on accounting comparability in an emerging economy and the moderating role of COVID-19 pandemic for the companies listed on Tehran Stock Exchange (TSE).

The data about 181 companies during 2014–2021 were examined. In this study, accounting comparability was predicted for the firms' accounting systems and the coefficient estimates were calculated. The present study used the coefficient of variation of sales to capture sales volatility as the primary environmental uncertainty measure.

The results showed that both the earnings volatility and environmental uncertainty have a significant negative effect on accounting comparability, and that COVID-19 significantly increases the negative impact of earnings volatility and environmental uncertainty on accounting comparability. The hypothesis testing based on robust, GLS, GMM, GLM, OLS regressions and t+1 test confirmed these results.

The present study aimed to develop knowledge-providing benefits for companies about the accounting comparability and managing more efficient decisions. The present findings help investors to understand and evaluate the performance of firms more accurately especially in earnings volatility and environmental uncertainty conditions and in the wake of a pandemic crisis such as COVID-19.