Use your active listening skills to hear what the auditor is saying. Then respond; just give accurate, honest, factual answers. Do NOT volunteer additional information. (I thought I'd repeat that just in case you missed it the first time.)  I'm telling you it's easy to say, harder to execute so psyche yourself up for this one prior to the interview. You don't want to provide the auditor with another line of investigation by something you arbitrarily said during the interview. I know I've just said not to provide additional information, but sometimes, it will help the audit go more smoothly. If you are comfortable and only if you or your accountant feel it would be beneficial to your situation: Educate the tax auditor about your business by giving them a tour of your operations; or explaining how your business works if it is virtual. Explain any complex business transactions; your accountant hopefully explained to you his/her position on how the tax law applies in your situation. You may need your accountant to weigh in if necessary. Review the tax auditor's version of facts and technical arguments; correct any factual errors. Reference: Financial Post Feb 21, 2012 Ease the pain and expense of a CRA Audit