By OptiVal Editorial Desk
Getting a letter from the CRA is one of those moments that ruins a perfectly good Tuesday. Here is the part most owners do not hear often enough: reviews are rarely random. The CRA runs risk-based programs that compare your return against slips, industry averages, and your own filing history, then flags the files that look off. Knowing the common CRA audit triggers for small business puts you in a much stronger position, because most of them are avoidable with decent records and a little discipline.
How the CRA Chooses Which Files to Review
Every return passes through automated checks first. The CRA’s matching program lines up the T4s, T5s, and T3s issued in your name against what you reported. Its systems also benchmark your revenue and expense ratios against averages for your industry code, and compare this year against last year. Big swings and big gaps earn a closer look.
Not every flag leads to a full audit. Many reviews are simple desk checks handled by letter, resolved in a few months. A smaller number become field audits, where an auditor digs through your books in detail over several months. You cannot eliminate the risk entirely, since a small slice of files is selected at random each year, but you can avoid handing the CRA a reason to pick yours.
10 CRA Audit Triggers Small Business Owners Should Know
1. Income that does not match your slips. This is the easiest flag to avoid and one of the most common. Every T4, T5, and T3 slip issued to you or your company is also sent to the CRA. If the totals do not line up with your return, the matching program fires off a notice automatically.
2. Large or repeated GST/HST refund claims. Refunds get reviewed before the money leaves the building. If your input tax credits spike one quarter with no matching change in sales, expect questions. The same goes for GST/HST filings that do not reconcile with the revenue on your income tax return.
3. A cash business with thin records. Restaurants, coffee shops, salons, and trades see more audit attention because cash is harder to trace. If bank deposits consistently run ahead of reported sales, the CRA will want an explanation.
4. Losses year after year. Three or more years of losses in a row raises the question of whether the activity is a real business or an expensive hobby. Early-year losses are normal. A long run of red ink with no path to profit is a flag.
5. Deductions that dwarf your industry average. The CRA benchmarks expense ratios by industry. A $28,000 vehicle claim on $90,000 of consulting revenue will stand out next to peers claiming a fraction of that. The claim might be entirely legitimate, but you will need the logbook to prove it.
6. Personal expenses running through the company. Groceries, family travel, personal subscriptions coded as “miscellaneous”. Auditors see these patterns constantly, and once they find one personal item, they keep digging.
7. Family members paid salaries that do not match the work. Paying a spouse or teenager a salary is fine when the pay is reasonable for the actual work performed. A $60,000 salary for five hours of filing a month is not reasonable, and the CRA knows what reasonable looks like.
8. Shareholder loans that never get repaid. A debit balance in your shareholder loan account that sits there year after year is a classic field-audit item. If it is not repaid within the required window, the CRA can treat the amount as income to you, plus tax and interest.
9. A big balance owing with no instalment payments. If you owe more than $3,000 at filing time and paid nothing in quarterly instalments, it signals either poor planning or something worse. On top of that, instalment interest at the CRA’s prescribed rate adds up quickly.
10. Platform, crypto, or foreign income left off the return. Gig platforms, payment processors, and crypto exchanges increasingly report to the CRA, and foreign property over $100,000 needs a T1135. “They won’t find out” was a strategy that worked in 2005. It does not work now.
A few triggers sit outside your control: tips from the public, a rough audit history that puts you on a watch cycle, and plain random selection. Those are rare. The ten above drive most selections, and every one of them is within your control.
What a CRA Review or Audit Actually Looks Like
A pre-assessment review is the lighter version: the CRA asks for receipts or an explanation on one or two items, usually resolved by mail within a few months. A field audit is the deeper version, where an auditor reviews your books in detail and it can take many months.
If a letter ever arrives, a few practical points help. Deal with it promptly. Keep everything in writing. Provide exactly what was asked and nothing more. If you disagree with a reassessment, you have 90 days from the notice to file a Notice of Objection. And the reassessment clock matters: for a Canadian-controlled private corporation the normal period is three years from the original assessment, but it extends to six years for negligence or misrepresentation, and there is no time limit for fraud.
How to Keep Your File Out of the Pile
None of this requires genius. It requires routine.
- Reconcile your slips, GST/HST filings, and reported sales every year before filing.
- Keep receipts and records for six years, organized so you could hand them to a stranger.
- Document the big claims: a vehicle logbook, a home-office calculation, contracts for family salaries.
- Keep personal and business money fully separate. One card, one account, no mixing.
- If the CRA writes to you, respond on time and in writing, and answer the question asked.
Boring, consistent bookkeeping is the single best audit insurance a small business can buy. Our bookkeeping and CRA support services cover exactly this work when doing it in-house is not realistic.
A Cheaper Fix Than a Reassessment
If reading this list made you wince, fixing it now costs far less than a reassessment later. Our bookkeeping cleanup starts at $45/hr, and monthly bookkeeping plans from $199/mo keep your file clean all year. See what is included on our pricing page, or book a free consultation and we will take a look at where your file stands.
