As per CRA:

Reporting capital gains:

• complete Schedule 3
•  after completing schedule 3, 50% of the total is transferred to line 12700 of your tax return as your taxable capital gain amount.

Reporting capital loss:

Just as with capital gains, capital losses are reported using schedule 3, and allowable losses may be used to offset gains within the current year, up to three years prior, or carried forward to future years, depending on the situation.

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