Temporal binding refers to the subjective contraction in time between actions and their consequences. Since it was reported in 2002 the effect has generated much interest, although a consensus regarding the mechanisms behind it remains elusive. While multiple theoretical accounts have been proposed, a key point of contention remains whether the effect is the result of the perception of intentionality or causality. We deployed a new apparatus to compare intentional to mechanical causation. Thirty participants reported the interval between two events in self-causal, mechanical-causal and non-causal conditions. The results of a Bayesian analysis pointed to smaller temporal estimates in the self-causal condition compared with the mechanical-causal condition, in addition to smaller estimates in the mechanical-causal condition compared with the non-causal condition. The evidence presented here suggests that causality alone may be sufficient for temporal binding to occur, but that this effect is boosted by the presence of intentional action.