Should I have received a T4 Summary from Ceridian?

No. Since tax forms are filed electronically, CRA does not require a Summary. The T4 recap report in your year-end package contains all of the information required on the Summary. For this reason, Ceridian does not print actual summaries. Another reason is that, in the past, customers have inadvertently sent the copy of the Summary provided by Ceridian, resulting in calls from CRA looking for their tax forms which had already been sent by Ceridian. If you require an actual Summary, CRA’s fillable T4 and T4A Summaries can be completed at https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/payroll/completing-filing-information-returns.html. CRA no longer sends paper summaries to employers via the mail.