This study predicts tax avoidance by means of social network analytics. We complement previous literature by being the first to build a predictive model including a larger variation of network features. We construct a network of firms which are connected through shared board membership. Three analytical techniques are applied creating five models using either firm characteristics or network characteristics or different types of combinations of both. A random forest which includes firm characteristics, network characteristics of firms and network characteristics of board members provides the best performance with an increase of 7% in AUC. Hence, including network effects significantly improves the predictive ability of tax avoidance models, implying that board members exhibit specific knowledge which can carry over across firms. We find that having board members with no connections to low-tax companies lowers the likelihood of being a low-tax firm.