As per Canada Revenue Agency (CRA): To carryback a capital loss, you must complete Form T1A, Request for Loss Carryback.
Complete the following steps:
1. Click on > Deductions > Losses Profile > Request for Loss Carrybacks
2. Select for whom the losses will be claimed > click Continue until you reach the page Net Capital Loss Carrybacks.
3. Choose the amounts you wish to have applied to previous years
Please visit the following TurboTax FAQ: Where do I report capital gains or losses in TurboTax Online?
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