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What evidence do I need to declare tutoring income on my income tax?
I have been a private tutor on and off for about 30 years, in three countries, so I understand your concerns!  I always kept records as though it was a real business - even if I only had one student I kept records of dates/times/names, and also tracked where the money went (I never spent it straight up - it always got deposited to complete the paper trail; yes, this is paranoia on my part).  I've never been asked to prove anything with regards this income (although I have no Canadian experience). It's always been a case of tell the tax folks and make sure my arse is covered if they come asking questions. Hope this helps.