Using Taiwan listed firms from 2014 to 2018 as a sample, this study explores whether the board members with accounting background are associated with firms’ tax avoidance. I further investigate the relationship between the job tenure of the accounting supervisor and firms’ tax avoidance. The empirical results show that the higher the proportion of board members with accounting background, the lower the degree of corporate tax avoidance. The evidence also shows that the longer the accounting supervisor has worked, the higher the degree of tax avoidance. The empirical results have contributions on the literature of the effects of accounting supervisors on firms’ tax avoidance behaviors, and can provide suggestions for the regulators and for practical use.