Opening your mailbox to find a letter from the Canada Revenue Agency is enough to make most people's stomach drop. But before you panic, it helps to understand exactly what you are dealing with. A CRA review letter in Canada is not the same as a tax audit, and in most cases it is a routine administrative check that can be resolved with the right documentation and a calm, organized response.
This guide explains the different types of CRA review letters Canadians receive, what each one means, how to respond correctly, and when it makes sense to bring in a professional accountant.
The terms "review" and "audit" are often used interchangeably, but they describe very different processes with very different stakes.
A CRA review is an administrative check. CRA is asking you to verify or clarify a specific item on your return — usually by sending supporting documents. It is not a comprehensive examination of your books and records. Reviews are handled largely through correspondence and are resolved without an officer visiting your premises.
A CRA audit, by contrast, involves a CRA officer systematically examining your financial records, books, and supporting documents — sometimes over multiple years. Audits are more formal, more time-consuming, and carry greater potential for reassessment and penalties.
Reviews are far more common than audits. Millions of Canadian taxpayers receive review requests every filing season, and the majority are resolved quickly once the requested documents are submitted.
This is the most frequent type of CRA review letter in Canada. CRA's automated matching program compares the income and deduction amounts on your return against third-party information slips — T4s from employers, T5 investment slips, T3 trust income slips, and others. If there is a discrepancy, CRA will write to ask you to explain or correct it.
These reviews are often resolved simply by submitting the relevant slip or a brief written explanation. For example, if you received a T5 from a bank account that you forgot to include, CRA will ask you to either confirm the omission or provide documentation showing why the slip was not applicable to your return.
If you are self-employed or operate a small business, CRA may question specific deductions you have claimed — most commonly home office expenses, vehicle use, or meals and entertainment. This type of review typically requests original receipts, a mileage logbook, a floor-plan sketch supporting your home office claim, or similar records.
Business enquiry reviews carry more complexity than personal T1 matching reviews, and the amounts at stake are often higher. This is the type of review where professional assistance is strongly advisable.
Businesses registered for GST/HST may receive a review letter asking them to support their Input Tax Credit (ITC) claims. CRA will match ITC amounts against purchase records and supplier invoices. You will typically be asked to provide supplier names, invoice numbers, amounts paid, and GST/HST registration numbers for your vendors.
The Community Volunteer Income Tax Program (CVITP) helps lower-income Canadians file their returns. Occasionally CRA will follow up with individuals who had their returns prepared through this program to verify certain credits or benefit entitlements claimed. These reviews are generally straightforward and focus on confirming eligibility for credits such as the GST/HST credit or the Canada Child Benefit.
In some cases, CRA will pause the processing of your return before issuing a Notice of Assessment in order to verify a particular claim — such as a large RRSP deduction, a disability tax credit, or a significant business loss. You will receive a letter asking for documentation before CRA completes the assessment. This can delay your refund until the review is resolved.
A post-assessment review occurs after CRA has issued your Notice of Assessment but has placed a hold on your refund pending further verification. CRA has assessed your return but wants to confirm certain items before releasing the funds. You will need to provide the requested documents to have your refund processed.
Responding properly to a CRA review letter can mean the difference between a quick resolution and a prolonged dispute. Follow these steps carefully.
Before doing anything else, read the letter from start to finish. Identify precisely what CRA is asking for — specific line numbers, tax years, types of documents. Do not guess and do not over-respond. CRA has asked for something specific, and your goal is to address exactly that request, nothing more.
A common and costly mistake is sending CRA additional documents, records, or explanations that were never requested. Volunteering unrequested information can open the door to further questions or a broader review. Provide what was asked, organized clearly, and stop there.
Prepare a clear cover letter that includes your full name, Social Insurance Number (SIN), the reference number or assessment number from the CRA letter, and the tax year in question. Label each document you include and reference it in your cover letter so the CRA reviewer can match everything easily.
CRA review letters typically allow 30 days for a response. Mark the deadline on your calendar the moment you receive the letter. If you need more time, contact CRA before the deadline to request an extension — they will often grant one if asked in advance.
You have two main options for submitting your response:
Never send original documents to CRA. Send clear photocopies and retain all originals for your records.
Once CRA receives your documentation, the review process typically takes four to eight weeks to complete, though times can vary based on CRA's workload and the complexity of your file. You can check the status of your review through My Account.
If CRA is satisfied with your response, they will either confirm your original assessment or issue a Notice of Reassessment reflecting any agreed corrections. If your refund was held pending the review, it will be released once the file is closed.
If the review results in a reassessment that increases your tax owing and you believe it is incorrect, you have the right to formally object. File a Notice of Objection within 90 days of the date on the Notice of Reassessment. The objection goes to CRA's Appeals Branch, which is separate from the Audit and Compliance division that conducted the review.
If the Appeals Branch does not resolve the dispute to your satisfaction, you can escalate to the Tax Court of Canada. Most disputes, however, are settled at the objection stage.
Not every CRA review letter requires professional assistance, but several situations make it well worth the cost.
Consider working with a professional accountant if:
An accountant can communicate directly with CRA on your behalf once you have signed a T1013 (Authorizing or Cancelling a Representative) form. This means you do not have to navigate CRA correspondence alone, and a professional can ensure your response is complete, accurate, and presented in the most favourable light.
At Swift Accounting Calgary, our team regularly assists clients with CRA reviews, correspondence management, and objections. Whether you have received a routine matching letter or a more complex business enquiry, having an experienced accountant in your corner takes the stress out of the process and helps protect your financial interests.
No. A CRA review letter is an administrative request for documents to verify a specific item on your return. An audit is a comprehensive examination of your books and records conducted by a CRA officer. Reviews are far more common and are generally less serious than full audits. Many Canadians receive a CRA review letter in Canada every year and resolve the matter without any reassessment.
After you submit your documents, CRA typically takes four to eight weeks to complete a review. Pre-assessment reviews may take longer because CRA will not process your return until the review is closed. You can check the current status of your file at any time through the CRA My Account portal.
If you do not respond by the deadline, CRA may reassess your return based on the information available to them — which usually means disallowing the deduction or credit in question and issuing a Notice of Reassessment for additional tax owing. If you need more time, contact CRA before the deadline passes and request an extension. Acting early is always better than ignoring the letter.
It is generally not advisable to volunteer documents or information that CRA has not specifically requested. Sending unsolicited records can raise additional questions and potentially broaden the scope of the review. Respond precisely to what was asked, and keep your cover letter focused. If you are unsure whether something is relevant, consult an accountant before including it.
Receiving a CRA review letter is stressful, but it is a manageable process when you understand what is being asked and how to respond. Stay organized, meet your deadlines, provide exactly what was requested, and keep copies of everything you send. For anything involving a business review, a large reassessment, or a Notice of Objection, professional support can make a significant difference in the outcome.
The team at Swift Accounting is here to help Calgary individuals and business owners navigate CRA correspondence with confidence. Contact us today to discuss your situation and find out how we can help you respond to a CRA review letter and protect your tax position.
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