When the CRA Comes Asking: Reviews, Audits, and How to Survive Them
Few pieces of mail raise a freelancer's heart rate like an envelope from the Canada Revenue Agency. Here is the context that letter never includes: the overwhelming majority of CRA contact that self-employed Canadians receive is not an audit. It is a routine review — a request to send documents supporting a specific claim — and it closes quietly once you provide them. The difference between a stressful month and a ten-minute reply is almost entirely determined by one thing: whether your records already exist, organized and dated, before the letter arrives. This guide walks through the CRA's ladder of scrutiny, the patterns that actually attract attention on self-employed returns, exactly how to respond to a review letter, and what to do in the rare case a file escalates.
The Ladder of Scrutiny: Review vs Audit
"Audit" gets used loosely, but the CRA's contact with taxpayers runs on a ladder, and most self-employed Canadians only ever see the bottom rungs:
| Level | When It Happens | What It Looks Like |
|---|---|---|
| Pre-assessment review | After you file, before your Notice of Assessment | A letter asking for documents supporting specific claims; your refund may be held until you respond |
| Processing review | After your Notice of Assessment, often summer–fall | Same document-request format, after the fact — the most common review type |
| Matching program | Typically fall and winter | The CRA compares slips filed by third parties against what you reported and asks about gaps |
| Audit | Comparatively rare | An assigned auditor examines books and records in depth, sometimes across multiple years, by correspondence or in person |
The first three levels are administrative. They are handled by processing centres, they concern specific line items, and they end the moment adequate documentation lands in the file. Treat a review letter as a records test, not an accusation — because that is what it is.
The Matching Program: The CRA Already Has Slips About You
Self-employed income feels invisible because no employer files a T4 for it. Less of it is invisible than freelancers assume. Clients who paid you fees may have filed T4A slips (box 048, fees for services). Construction contractors receive T5018 slips from payers. Gig and marketplace platforms are subject to reporting rules that put platform income in front of the CRA. Banks report interest; payment processors have records.
The matching program runs your return against everything filed about you. If the gross income on your T2125 is smaller than the sum of the slips bearing your SIN or business number, a letter follows — and this particular letter is one you prevent entirely with clean invoicing records. Your invoice ledger, summed by client, should reconcile to the slips your clients file. When it does, a matching inquiry is a one-paragraph reply. For the reporting workflow that produces that ledger, see our freelance invoicing guide.
What Actually Attracts Attention on a Self-Employed Return
The CRA selects files using risk scoring, and while the exact model is not published, the patterns that recur in practice are consistent. None of these is a violation — each is simply a statistical outlier that invites a closer look:
1. Vehicle Business-Use Percentage Above ~90%
A claim that a household's only vehicle is used 95% for business raises an obvious question: how do groceries happen? Sole proprietors with family responsibilities and one car typically land in the 40–70% range. High percentages are defensible — with a contemporaneous log. See our CRA mileage log guide for what that log must contain.
2. Home-Office and Business Losses, Year After Year
Business-use-of-home expenses cannot create or increase a loss, and a business that loses money every year invites the question of whether it is a business at all. Occasional losses are normal; perpetual ones are a pattern.
3. Expense Ratios That Don't Match Your Industry
Your T2125 carries an industry code, and the CRA benchmarks your expense categories against others filing under the same code. A graphic designer claiming fuel costs typical of a courier stands out — sometimes because the industry code is wrong rather than the expenses. Check yours against our T2125 industry code guide.
4. Round Numbers Everywhere
Advertising: $2,000. Meals: $1,500. Vehicle: $5,000. Real records produce messy numbers; uniform round figures signal estimation, and estimated claims are the easiest to challenge.
5. Large Year-Over-Year Swings
Income halving or expenses doubling without an obvious cause gets flagged by comparison against your own filing history. Real explanations (a lost anchor client, an equipment year) survive scrutiny fine — the point is the file gets opened.
How to Respond to a Review Letter
When the letter arrives, the process is mechanical. Follow it exactly:
- Note the deadline. Typically around 30 days from the date printed on the letter — not the date you opened it. Letters often appear in CRA My Account before the mail arrives, so check there.
- Read what is actually being asked. Reviews target specific lines. If the letter asks about motor vehicle expenses, send vehicle documentation — not your entire year. Volunteering unrelated records expands the review's surface area for no benefit.
- Send copies, never originals. Submit through the "Submit documents" service in CRA My Account using the case or reference number on the letter, or by the mail/fax details provided. Keep everything you send.
- Answer completely, once. A single organized package — a cover page listing the claim, the total, and the attached evidence — closes files faster than piecemeal follow-ups.
- If you need more time, call before the deadline. The number is on the letter, and reasonable extensions are routinely granted. Silence is the only response that is always wrong: unanswered claims are denied and reassessed with interest.
What Good Documentation Looks Like
Reviews are decided by paper, and the standard is contemporaneous — records made at the time, not reconstructed when the letter arrives:
- Receipts showing vendor, date, amount, and the GST/HST paid — with the business purpose noted. Our CRA receipt requirements guide covers what survives scrutiny and how long to keep it (six years from the end of the tax year, and digital copies are acceptable when legible).
- A mileage log with dates, destinations, purposes, and kilometres per trip, reconciling to annual odometer readings — the make-or-break document for any vehicle claim.
- Invoices issued, numbered sequentially, summing to your reported gross income.
- Calculations shown for percentage-based claims: the workspace-area math behind a home-office claim, the business-use percentage behind a vehicle claim.
A March shoebox fails this standard even when every deduction in it is legitimate — reconstructed records look reconstructed, and suspiciously tidy logs are their own red flag.
When to Bring In Representation
A routine document-request review is usually a do-it-yourself exercise. Involve an accountant (or, for serious disputes, a tax lawyer) when: the letter announces an actual audit with an assigned auditor; multiple years are in scope; the amounts at stake are material; the questions touch judgment calls like hobby-versus-business or personal-versus-business use; or the correspondence has turned adversarial. You can authorize a representative through CRA My Account, and having one changes nothing about your standing — auditors work with representatives every day. The fee is itself a deductible professional expense (see what accountants cost).
The Possible Outcomes
Reviews and audits end one of three ways. No change: your documentation held; the file closes. Reassessment: some claims are adjusted and a Notice of Reassessment arrives showing additional tax and arrears interest. Objection: if you disagree with a reassessment, you can file a Notice of Objection — online through My Account or on Form T400A — generally within 90 days of the reassessment date, which moves the file to an appeals officer independent of the original reviewer. Many disputes settle at the objection stage; beyond it lies the Tax Court, which is rare territory for freelancer-sized files.
Prevention: The Review That Answers Itself
Everything a review letter asks for is a record you either kept in the moment or didn't. That is the entire game, and it is why the best audit strategy is a boring, consistent capture habit throughout the year.
Frequently Asked Questions
What's the difference between a review and an audit?
A review is a targeted document request handled by processing centres; it closes when you supply the paperwork. An audit is a deeper examination of your books by an assigned auditor, sometimes spanning years. Most self-employed Canadians only ever experience reviews.
Does claiming home office or vehicle expenses trigger an audit?
No single claim does — anomalies do: business-use percentages above ~90%, losses every year, expense ratios far outside your industry code's norms, or obviously estimated round numbers. Reasonable, documented claims are exactly what the system expects.
How long do I have to respond to a review letter?
Typically about 30 days from the date on the letter. Check CRA My Account (letters often appear there first), and call the number on the letter before the deadline if you need an extension — reasonable requests are routinely granted.
What happens if I ignore the letter?
The claims in question are denied and reassessed with interest. You can still object — generally within 90 days of the reassessment — but that path is slower and harder than answering the original letter.
How long should I keep my records?
Six years from the end of the tax year they relate to. Digital copies of receipts are acceptable when they're legible and complete — which is a strong argument for capturing them the day you get them.