Although consumers' risk‐taking, supplier trust, social norms and information involvement are central to much of thought in the financial market and consumer economic literature, it is not known how the interplay between consumers' trust in supplier information, risk‐taking behaviour and social norm may influence information involvement. This research contributes to the consumer economic literature by investigating how product savings risk and social norm affect the relationship between young adults' trust in supplier information and their information involvement. On the basis of two samples with young adults who recently have purchased a low‐risk savings product (n = 641) and a high‐risk savings product (n = 219), respectively, several results are obtained. It is found that both product savings risk and social norm positively moderate the relationship between young adults' trust in supplier information and their information involvement. In addition, the results indicate that the three‐way interaction between trust in supplier information, products savings risk and social norm has a positive effect on information involvement. As direct implications, financial authorities and financial service managers should especially consider investing additional resources in developing information trust for high‐risk savings products and should also take social norms into account when considering young adults' high‐risk‐taking behaviour. Copyright © 2017 John Wiley & Sons, Ltd.