Should I have received a T4 Summary from Dayforce?

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, Dayforce does not print actual summaries. Another reason is that, in the past, customers have inadvertently sent the copy of the Summary provided by Dayforce, resulting in calls from CRA looking for their tax forms which had already been sent by Dayforce. 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.