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Firm value depends on several factors, including board and tax planning. In general, the characteristics of the board of directors and the audit committee may affect the relationship between tax planning and firm value. Accordingly, this study aimed to examine the moderating role of the board of directors in the relationship between firm value and tax planning. The study's statistical population was companies listed on the Tehran stock exchange during the 6 years from 2017 to 2022, with 113 companies studied. According to the results, the size of the board of directors and the size of the audit committee affects the relationship between tax planning and firm value. However, board independence and gender diversity affect the relationship between tax planning and firm value. The existence of a conflict between some of the board of directors' characteristics when examining the relationship between tax planning and company value indicates the need to take a comprehensive view of the issue and avoid merely analyzing linear relationships between the variables above.
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