Invested money with a private Canadian corporation?
If you have invested money with a private Canadian corporation carrying on an active business, including your own corporation, and the debt becomes uncollectible you can deduct 50% of the loss as an allowable business investment loss (ABIL) in computing your personal Canadian income tax liability.
"This article provides information of a general nature only. It is only current at the posting date. It is not updated and it may no longer be current. It does not provide legal advice nor can it or should it be relied upon. All tax situations are specific to their facts and will differ from the situations in the articles. If you have specific legal questions you should consult a lawyer."