Understanding CRA Reviews and Audits
Receiving a letter from the Canada Revenue Agency asking for more information can be unsettling — but it doesn't always mean trouble. The CRA conducts different levels of scrutiny, from a simple review of one line item to a full audit of your business records. Understanding what triggers these reviews helps you file accurately and confidently.
The Difference Between a Review and a Full Audit
- Processing review – The CRA asks you to verify a specific claim, such as medical expenses or charitable donations. This is common and usually resolved by submitting receipts.
- Desk audit – A more detailed review conducted by mail or phone, focusing on a particular area of your return (e.g., self-employment income or rental expenses).
- Field audit – An in-person review at your home or business location. Less common and usually reserved for complex or high-risk returns.
Common Triggers for CRA Scrutiny
Large or Unusual Deductions
If your deductions are significantly higher than what's typical for someone with your income level or occupation, the CRA's systems may flag your return for a closer look. This doesn't mean you've done anything wrong — just that documentation is especially important.
Consistently Reporting Business Losses
Claiming business losses year after year — particularly if they offset other income — can attract attention. The CRA may question whether the activity is a legitimate business or a personal hobby. Your intent to profit, and evidence of that intent, is key.
Self-Employment Income With High Expense Ratios
Reporting very high expenses relative to your revenue is a common trigger. The CRA looks at expense ratios by industry, so if your expenses seem unusually high for your type of work, expect more scrutiny.
Significant Cash Income
Businesses operating primarily in cash — trades, restaurants, personal services — are more likely to be reviewed. Accurate cash records are essential.
Home Office Deductions That Seem Excessive
Claiming 80% of your home as a work space when you have a two-bedroom apartment will raise questions. The CRA expects home office claims to reflect actual, reasonable business use.
Mismatched Information
The CRA cross-references information from employers, financial institutions, and other government agencies. If a T4 or T5 slip filed by a third party doesn't match what you've reported, the discrepancy will trigger a review automatically.
How to Protect Yourself
- Keep organized records – Retain all receipts, invoices, bank statements, and contracts for at least 6 years.
- Document the business purpose – For vehicle and meal expenses, note the date, who was present, and the business reason.
- Keep personal and business finances separate – Use a dedicated business bank account and credit card.
- Be consistent – Dramatically different income or expense patterns from year to year invite questions. If your situation changed legitimately, be prepared to explain why.
- Respond promptly to CRA letters – Ignoring correspondence makes things worse. Respond within the deadline given and provide the requested documentation.
What Happens During an Audit?
If you're selected for an audit, a CRA auditor will notify you in writing. They will specify the tax years being reviewed and the records they want to examine. You have the right to representation — a tax professional, accountant, or lawyer can communicate with the CRA on your behalf. After reviewing your records, the CRA will issue a proposal letter outlining any proposed changes. You have the right to object if you disagree.
The Bottom Line
Most Canadians will never face a full audit. Filing accurately, keeping good records, and responding promptly to any CRA inquiries is the best protection. The CRA is not looking to penalize honest mistakes — they're primarily focused on identifying deliberate non-compliance.