Income Tax Act Subsection 3(d), 38(c), 39(1)(c), 40(2)(g)(ii), and 50
An allowable business investment loss (“ABIL”) is half of a capital loss, which was incurred on the sale of shares, or a debt of a small business corporation. The importance of receiving and ABIL rather than a capital loss is that an ABIL is deductible against any other source of income, not just capital gains.
Justice Bowman created a four-point test used to determine whether the loss is an ABIL.
CRA Resources
What is a business investment loss?
What happens when you have an ABIL?
Chart 6 – How to claim an ABIL
Form T1A, Request for Loss Carryback
Income Tax Folio S1-F5-C1, Related persons and dealing at arm’s length
IT232, Losses – Their deductibility in the loss year or in other years
IT484, Business investment losses
Case law
Coveley v Canada, 2014 FCA 281 – When is a Debt a “Bad Debt”?
Detailed Case law analysis may be found here: http://ita-annotated.ca/RecentDecisions/category/substantive-provision/allowable-business-investment-loss/