Common CRA Audit Triggers and How to Avoid Them
What increases your chances of a CRA audit — and how to reduce risk through proper documentation and compliance.
A CRA audit letter is something every business owner dreads — but understanding what triggers one is the best way to avoid it. While no business is immune, certain patterns in your tax return significantly increase your odds of being selected for review.
Income Fluctuations and Discrepancies
Large swings in reported income from year to year catch the CRA's attention. A business that reports $80,000 one year and $30,000 the next without a plausible explanation (industry downturn, sold division, etc.) is more likely to be flagged.
The CRA cross-references your reported income against third-party data: T4s, T5s, T3s, and RC210 (fees paid by businesses to independent workers). If your T2125 revenue doesn't match what clients reported paying you, an audit is almost certain.
Expense Ratios That Exceed Industry Norms
- The CRA maintains detailed industry benchmarks. A construction contractor claiming 25% of revenue in vehicle expenses when the industry average is 8% will be flagged automatically.
- Gross profit margins that fall far below industry standards (e.g., a restaurant at 40% margin when the sector averages 60%) prompt a review of how cost of goods sold was calculated.
- Large or one-time expenses that appear disproportionate to the business size also raise questions — the CRA will request supporting contracts and receipts.
A BC-based landscaping company claiming $18,000 in home-office expenses on $60,000 of revenue would exceed the typical 5–10% range for that sector. The CRA would almost certainly request floor plans and supporting calculations.
Related-Party Transactions
Transactions with family members, shareholders, or other businesses you control are subject to special scrutiny. The CRA looks for income splitting with family members who don't legitimately contribute, or inflated payments to a spouse's company that aren't at fair market value.
Loans to shareholders are a common audit trigger. If a shareholder takes money from the corporation without a formal loan agreement, prescribed-rate interest, and a repayment schedule, the CRA can deem the amount a dividend or taxable benefit.
Transfer pricing rules apply to transactions with non-arm's-length parties. Even domestically, you must ensure that payments for services, rent, or management fees reflect what an unrelated party would pay.
Repeated Business Losses
- A business that reports losses for three or more consecutive years is presumed to be a hobby rather than a business, unless there's clear evidence of a path to profitability.
- The CRA examines whether you have a reasonable expectation of profit (the REP test). Factors include your business plan, financial projections, time spent, and whether losses are due to start-up costs or ongoing structural issues.
- Document your profit plan. A written business plan, marketing strategy, and evidence of cost-reduction efforts demonstrate commercial intent and can prevent a loss claim from being denied.
Documentation Requirements That Prevent Audits
The best defence against a CRA audit is impeccable documentation. Keep all invoices, receipts, contracts, mileage logs, and bank statements organized and accessible for at least six years.
Digital records are acceptable if they are legible, complete, and backed up. The CRA can request PDF copies, accounting software exports, or spreadsheet reconciliations — and they expect a response within 30 days.
If you are selected for a review, do not panic. The scope is usually limited to specific areas flagged by the CRA's risk-assessment algorithm. Provide only what is requested and work with your accountant to frame the response.
Key Takeaways
- 1Consistent income reporting is your best defence — large swings without explanation are a top audit trigger.
- 2Keep expense ratios within industry norms; the CRA benchmarks every return against sector averages.
- 3Related-party transactions must be at fair market value with proper documentation (loan agreements, contracts).
- 4Three consecutive losses invite a 'reasonable expectation of profit' review — maintain a documented business plan.
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