A letter from the CRA lands and the stomach drops. That reaction is normal, and it is also usually wrong. Most CRA letters are not audits and not accusations. They are requests. The agency wants to confirm something, see a document, or reconcile a number that did not match. Handled properly, the large majority of them close quietly.
The damage in these situations rarely comes from the letter. It comes from the response, or the lack of one. Ignoring a CRA letter is what turns a routine question into a real problem. Here is how to handle one without panic.
First, read it for what it actually says
CRA correspondence comes in a few flavours, and they are not equally serious. A request for information or a pre-assessment review is the agency asking you to support something on a return before they finalize it. A reassessment is a notice that they have changed something. A notice about a balance owing is about payment. And an audit letter, which is the rarest, signals a deeper examination.
Identify which one you are holding before you react. The required response and the urgency are completely different across these categories, and treating a routine review request like an audit just wastes energy you will want later.
For most small businesses, the letter that arrives is a routine review, often tied to a GST/HST return or a specific expense the CRA wants supported. These are common, they are not a sign you did anything wrong, and they are usually resolved with a single clean response. Knowing that going in changes how you handle it. You are not defending yourself. You are confirming something the agency could not see from the return alone.
Note the deadline, and respect it
Almost every CRA letter has a response deadline, usually thirty days from the date on the letter. That date matters more than almost anything else in the process. Responding on time, even with a partial answer or a request for more time, keeps you in good standing. Missing it is what escalates the file.
If you genuinely cannot gather everything by the deadline, you can usually call and request an extension. The agency is far more accommodating to someone who engages before the deadline than to someone who goes silent and resurfaces after it.
Gather exactly what they asked for, and nothing more
When the CRA asks for documentation, give them precisely what the letter requests. Not less, because gaps invite follow-up. And not a giant unsorted pile of everything, because that creates confusion and can open questions that were never on the table.
If they want backup for a specific expense category, provide the invoices and proof of payment for that category, organized clearly. The goal is to answer the exact question they asked, completely, in a form that is easy to review. A clean, responsive reply is what closes a file fast.
Keep your tone factual, and your records straight
Respond in writing where you can, keep a copy of everything you send, and note the date you sent it. If you call, write down who you spoke with and what was said. This is not about distrust. It is that a clean paper trail protects you if anything is ever in question later, and it keeps your own side of the story consistent.
Keep the tone factual. You are not arguing a case. You are answering a question. The calmer and more organized the response, the faster it tends to resolve.
If you genuinely made a mistake
Sometimes a CRA letter is right and you did get something wrong. If you discover an error, the worst move is to hope it goes unnoticed. The CRA’s Voluntary Disclosures Program exists for exactly this, and changes that took effect in late 2025 made it easier to apply to and understand. Coming forward through the proper channel almost always costs less than being caught, both in penalties and in stress.
When to bring in help
You can handle a simple information request yourself. Bring in a professional when the letter involves a reassessment you disagree with, a number you cannot explain, a sum large enough to matter, or anything that touches GST/HST or cross-border activity, because those areas have rules that are easy to get wrong under pressure.
There is also a quieter benefit to having clean monthly books before any letter ever arrives. When your records are reconciled and current, a CRA request is a matter of pulling the file, not reconstructing a year of activity from memory. The businesses that handle CRA letters calmly are usually the ones whose books were already in order.
If a letter has arrived and you are not sure how to respond, or you want your records in a state where the next one is a non-event, book a free Diagnostic and we will help you get there.
