CRA correspondence handling
https://smart-wiki.win/index.php/Mastering_CRA_Correspondence_Handling:_A_Guide_for_Canadian_Corporations
Dealing with CRA correspondence can be stressful, but staying organized helps. When you get a letter about your taxes, read it carefully to understand what the Canada Revenue Agency needs. Gather your records, note any deadlines, and respond clearly, either online or by mail. Keep copies of everything you send. If something's unclear, you can call the CRA to ask questions or get help from a tax professional.