What triggers a CRA audit for small businesses?

CRA does not audit randomly — it uses risk-scoring algorithms and third-party data to prioritize files for review. Understanding what triggers an audit flag is the first step in structuring your tax affairs to avoid unnecessary scrutiny while staying fully compliant.

What are the most common CRA audit triggers for small businesses in 2026?

The top audit triggers include: (1) Cash-intensive businesses — restaurants, contractors, beauty salons with low reported income relative to industry benchmarks; (2) Self-employment losses in 3+ consecutive years — CRA’s hobby loss test; (3) Large home office claims — deductions exceeding 50% of home expenses; (4) Vehicle expenses without mileage logs; and (5) Significant discrepancies between T-slip income reported by third parties and income declared on your return.

Does CRA target specific industries for audits?

Yes — CRA runs industry-specific audit programs. In 2025–2026, high-focus sectors include: construction and home renovation (underground economy); real estate agents and developers (principal residence and GST/HST on new builds); e-commerce and cryptocurrency (unreported digital asset gains); cash-based retail; and professional services corporations with complex shareholder compensation structures.

What foreign income and asset reporting triggers CRA audits?

Failure to file Form T1135 when you hold foreign property costing over $100,000 is one of the highest-confidence audit triggers. CRA receives data under the Common Reporting Standard from financial institutions in 40+ countries — so undisclosed foreign accounts are often identified before an audit begins. Additional triggers: unreported dividends from foreign corporations, foreign rental income, and cryptocurrency held on foreign exchanges.

Can investment income trigger a CRA audit?

Investment income itself is relatively low risk, but specific patterns trigger review: unreported dividends from private corporations (CRA automatically matches T5 slips); capital loss claims without adequate documentation (ACB records for each security); and large net capital gains without prior history. A sudden increase in investment income also prompts verification of the source, particularly for cryptocurrency or private placements.

What happens if CRA conducts a net worth audit?

A net worth audit reconstructs income by comparing your opening net worth + personal expenditures + taxes paid against your closing net worth. Any unexplained surplus is treated as unreported income. CRA uses public records (land registry, vehicle registrations, travel records) to estimate lifestyle expenses. The burden of proof shifts to the taxpayer. Inadequate records make net worth audits extremely difficult to defend and typically result in significant reassessments.

What should I do to audit-proof my small business?

Best practices: (1) Keep 6+ years of source documents; (2) Maintain a mileage logbook for every vehicle; (3) Reconcile all income to T-slips and bank records; (4) File T1135 if foreign property cost exceeds $100,000; (5) Ensure business expenses are proportionate to revenues; (6) Engage a CPA to review your return before filing in high-risk years.

Reviewed by: Bader A. Chowdry, CPA CA LPA — Insight Accounting CPA Professional Corporation, Mississauga, Ontario. Last reviewed: June 6, 2026.