If you do not have any tax slips from where you worked, CRA will probably have copies of your T4 slips.
As per CRA-
If you have not received, or have lost or misplaced a slip for the current year, you have to ask your employer, or the issuer of the slip, for a copy.
If you know you will not be able to get a slip on time to file your return, or you do not receive them, and you are registered for the CRA My Account for Individuals service, you may be able to view your tax information online. Otherwise, attach a note to your paper return stating the payer's name and address, the type of income involved, and what you are doing to get the slip.
Use your pay stubs or statements to estimate the income to report and any related deductions and credits you can claim. Attach a copy of the pay stubs or statements to your paper return and keep the original documents. If you are filing electronically, keep all of your documents in case the CRA asks to see them later.
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