Lines 21699 and 21700 - What happens when you incur an ABIL?
You can deduct your ABIL from your other sources of income for the year. If your ABIL is more than your other sources of income for the year, include the difference as part of your non-capital loss.
Although you can generally carry a non-capital loss back 3 years and forward 20 years, this does not apply to a non-capital loss resulting from an ABIL. Instead, an ABIL that has not been used within 10 tax years will become a net capital loss in the eleventh year.
To carry a non-capital loss back to 2018, 2019, or 2020, complete Form T1A, Request for Loss Carryback, and include it with your 2021 income tax and benefit return (or send one to the CRA separately). Do not file an amended return for the year to which you want to apply the loss.
The unapplied part of your non-capital loss resulting from an ABIL will become a net capital loss in the eleventh year. You can use this loss to reduce your taxable capital gains in any year after.
Any ABIL that you claim for 2021 will reduce the capital gains deduction you can claim in 2021 and in future years.
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