CRA indicates that the penalty for late-filing information slips references when the last slip was filed
The penalty under s. 162(7.01) for late-filing most types of information slip (e.g., the T3, T4, T4A, T5, NR4 or T4RSP) is calculated under a formula which references the number of late-filed slips and “the number of days, not exceeding 100, during which the failure continues.”
CRA