166.These three sections provide that where the designated officer knows the identity of a taxpayer and wants to check that taxpayer’s tax position, the designated officer can give a notice to a third party requiring that party to provide information or document(s) for the purpose of checking the tax position of the taxpayer. Such a notice is a “third party notice”. The taxpayer would have to agree to the third party notice or a tribunal would need to approve it, subject to certain conditions being met. The tribunal may also approve a third party notice that does not name the taxpayer if the tribunal accepts that having the taxpayer’s name in the third party notice might negatively affect tax assessment or collection. The designated officer must give a copy of the third party notice to the relevant taxpayer unless the tribunal decides that the designated officer has reasonable grounds for believing that doing so might negatively affect tax assessment or collection.