What an amended T4 means in Canadian payroll and how a corrected slip differs from an original or cancelled T4.
An amended T4 is a corrected T4 slip issued after the original T4 needs to be fixed.
In plain language, payroll uses an amended T4 when the slip was basically the right kind of document, but some reported information on it was wrong and has to be corrected.
An amended T4 matters because year-end payroll work does not always end once the original slips are filed.
It helps explain:
Readers often know that a T4 can be wrong, but they do not know the payroll term for the correction process.
In Canadian payroll, an amended T4 is used when payroll needs to correct information already reported on a T4 slip. The payroll team usually goes back to the underlying payroll records, confirms what should have been reported, and then prepares the corrected slip through the appropriate filing method.
That means the amended T4 sits at the intersection of:
| Correction path | When it fits | What stays true |
|---|---|---|
| Amended T4 | The slip is the right document type, but some reported data is wrong | The slip still belongs in the filing set |
| Cancelled T4 | The filed slip should not stand at all in that form | The original filing needs to be removed |
| Duplicate T4 | The employee needs another copy of the same slip | The reported data is not being changed |
CRA guidance distinguishes the amendment process from the cancellation process. For paper corrections, the amended slip itself is sent with an explanation rather than filing an amended paper T4 Summary.
An employer discovers after filing that a taxable amount on an employee’s T4 was reported incorrectly. Payroll reviews the year-end records and issues an amended T4 to correct the reported information.
The filing method and correction steps can change over time. The stable concept is that an amended T4 is the correction path when the original slip exists but reported information needs to be fixed.