Input tax credit mismatches are one of the most common reasons a small business gets flagged.

What this means for you

A common mistake is treating the first notice as the final word. Most CRA decisions have a formal review or objection path, and the deadline to use it is usually shorter than people expect — often 90 days from the date on the notice, not the date you opened the envelope.

What you can do next

  • Read the notice in full before responding to anything
  • Note every date mentioned, not just the one in bold
  • Keep a copy of everything you send, including the envelope or email header

Reconciling GST/HST filings against bank deposits quarterly catches most errors before CRA does.