Based on the special stock exchange comment letter system in China, this paper explores the relationship between the exchange tax-related comment letters and corporate tax avoidance behavior from the standpoint of securities regulation. We document that firms that engage in more aggressive tax avoidance are more likely to receive a tax-related exchange comment letter. Also, relative to firms receiving a non-tax-related comment letter, firms receiving a tax-related comment letter reduce their tax avoidance behaviors in subsequent years. Further study shows that the more the number of questions and the greater the level of detail in the comment letter, the stronger the effect of tax-related comment letters on corporate tax avoidance. After examining the sample with different degrees of political connection, we find that tax-related comment letters inhibit tax avoidance among state-owned enterprises and private enterprises with close political connections. Finally, the monitoring effect of comment letters on corporate tax avoidance is more pronounced in regions where tax administration is weak, suggesting that the comment letter system can be used as a complementary mechanism for tax administration.

This study examined the impact of inquiry letters on corporate tax aggressiveness based on the special inquiry system in Chinese stock exchanges. It found that the receipt of inquiry letters significantly inhibited tax aggressiveness. The channel through which inquiry letters worked involved a monitoring effect on related‐party transactions. The disincentive effect of inquiry letters on corporate tax aggressiveness was mainly found in firms with overseas operations, low‐quality of internal control, and weak tax enforcement. Examining the textual information in inquiry letters, the results show that more questions and the demand for a specific opinion from the auditor led to a greater disincentive effect. The level of detail in firms' reply letters weakened this disincentive effect. Finally, the disincentive effect of tax aggressiveness was more pronounced when inquiry letters pointed to tax‐related issues.

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