Procrastination is a self‑regulatory problem of voluntarily and destructively delaying intended and necessary or personally important tasks. Previous studies showed that procrastination is associated with executive dysfunctions that seem to be particularly strong in punishing contexts. In the present event‑related potential (ERP) study a monetary version of the parametric Go/No‑Go task was performed by high and low academic procrastinators to verify the infuence of motivational context (reward vs. punishment expectation) and task difculty (easy vs. hard) on procrastination‑related executive dysfunctions. The results revealed increased post‑error slowing along with reduced P300 and error‑related negativity (ERN) amplitudes in high (vs. low) procrastination participants—efects that indicate impaired attention and error‑related processing in this group. This pattern of results did not difer as a function of task difculty and motivation condition. However, when the task got more difcult executive attention defcits became even more apparent at the behavioral level in high procrastinators, as indexed by increased reaction time variability. The fndings substantiate prior preliminary evidence that procrastinators show difculties in certain aspects of executive functioning (in attention and error processing) during execution of task‑relevant behavior, which may be more apparent in highly demanding situations.