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As per CRA , you can deduct the cost of a training course as an employment expense. The course has to maintain, upgrade, or update your existing skills or qualifications that relate to your employment
Training expenses that can be directly related to your business would be shown as "Professional Development" expenses or "other expenses".
Please visit the link provided for further clarifications:
CRA: Training costs – Commission employee expenses
TurboTax: How do I claim home office expenses if I’m self-employed?
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