If you have not already NetFiled your 2019 tax return, you do not need to do a ReFile to either your 2019 or 2018 tax return. Any Loss CarryBacks to previous years are completed within the current year tax return, you NetFile as usual and CRA will make the necessary adjustment to include the loss carryback.
If you have already NetFiled your 2019 return, you will need to complete a T1A Request for Loss CarryBack form and mail it in to your tax centre. CRA does not allow you to use ReFile or Change My Return to carryback amounts such as capital or non-capital losses.
The form to complete can be found in this link: T1A Request for Loss Carryback
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