If you find yourself disagreeing with a CRA decision, there are several ways to dispute it. First, you may try to understand the issue by asking for clarification. If this does not resolve the problem, you can submit a formal Notice of Objection. This may bring the dispute to an end or serve as a precursor to appealing the CRA's decision to the Tax Court of Canada.
Most disputes between taxpayers and the CRA stem from a lack of supporting documentation. It is important to be prepared to provide evidence to support your claims at any stage of the dispute resolution process, whether it involves deductions, credits, or taxable income. The more detailed your submission, the greater your chances of success.