Abstract (click to expand): Groups with potentially heterogeneous time preferences, in households or firms, regularly make intertemporal decisions jointly related to consumption, savings, education, and investment. While there is theoretical work on groups’ intertemporal preferences, it has yet to be fully empirically tested. This paper uses reduced-form and structural methods to study the empirical relationship between individual and group time preferences. Unlike previous work, (i) we measure time preferences through the allocation of costly tasks over time, not monetary methods, (ii) use randomly created groups, (iii) and know the time preferences of both groups as well as their constituent individuals. We find that groups are much more present-biased than individuals. Connecting group behavior with individual members’ behavior, we find that individuals with higher present bias drive group decisions within groups. Further, we find that groups exhibit greater present bias when the difference in discount rates within-group is larger. Finally, we find that present bias in the group decisions is reduced when bargaining power in the group is less symmetric.