Forget a T slip: You are required to report all your income. The Canada Revenue Agency (CRA) receives copies of all the T slips issued, so if you forget, misplace or hide a T slip, it will inevitably be uncovered by their matching program and result in a reassessment. Do this twice in a two-year period and you will be looking at substantial penalties.
Your business looks like a hobby: The CRA does not expect every new enterprise to make a profit their first few years in business. However, you cannot create a business for the purpose of creating losses. There must be some reasonable expectation of profit in future years. If you claim year after year of losses, you may be answering questions about your business plan from a CRA auditor.