How CRA Selects Businesses for Tax Audits in Canada: Key Red Flags Explained

CRA Audit Triggers Canada: Red Flags, Risk Factors and Selection Explained by Gondaliya CPA

CRA audit triggers Canada often involve inconsistencies in tax returns, unusual expense claims, or missing information, making these common tax audit risk factors for taxpayers. Gondaliya CPA explains how understanding these audit reasons can help reduce the chances of a tax audit and prepare for any CRA review effectively.

The useful question is not what looks suspicious. It is what the CRA can already see. Most CRA audits begin with a mismatch between your return and information filed by somebody else.

Quick Summary

Selection works on data, not instinct. Third-party reporting is matched against your return, risk models compare you to your sector, and a smaller number of files are picked at random. The mismatches you can control are the ones worth fixing.

Reading time: 51 minutes.

The Numbers That Matter

How Selection Actually Works

Four Routes to Selection

Two things follow. First, the largest single category is not judgement at all, it is arithmetic: two numbers that should agree, and do not. Second, random selection means a clean, well-run business can still be picked, and preparation is worth having regardless.

A Word on Invented Scoring Models

You will find articles presenting a table of audit risk factors with percentage weights, producing a total score. Those numbers are made up.

The CRA does use risk assessment, and it does compare taxpayers against sector patterns, but it does not publish weights and no outside party knows them. A confident-looking table of percentages tells you the author invented a methodology, which is worth knowing when deciding what else to believe in the article.

What is genuinely known is the direction: more inconsistencies, and a larger gap from what is typical for your sector and size, means more attention.

Why the CRA Audits At All

• To verify that reported amounts are supported
• To maintain fairness between compliant and non-compliant businesses
• To address sectors where non-compliance has been identified
• To educate, since many audits close with adjustments and guidance rather than penalties

The last point is worth holding onto. Most small business audits are not investigations of dishonesty. They are verification exercises, and treating one as an accusation tends to produce a worse response than treating it as a request for evidence.

What Changes the Odds

You cannot control random selection or a sector project. You can control whether your numbers agree with the numbers already held about you, and that is where the effort belongs.

What the CRA Already Knows About You

Before anyone looks at your return, information about your business has already arrived from other parties. Understanding what is in that file is the single most useful thing in managing audit risk.

The Reporting That Reaches Them

Each of these can be matched against what you filed. A T4A issued to you that does not appear in your revenue, or a subcontractor reporting payments you never recorded, produces a difference that a machine can find without anyone forming an opinion.

The Reporting You Do About Others

This runs both directions, and it is where small businesses create their own exposure.

• T4 slips for employees, due the last day of February
• T4A slips for fees paid for services, same deadline
• T5018 slips where you are in construction, due six months after the reporting period you chose
• T4A-NR where a non-resident performed services in Canada

Please note the T5018 deadline is six months after the end of your chosen reporting period, not the end of February. The February deadline belongs to T4 and T4A slips, and guidance conflating them is common.

Where you fail to issue slips you should have, two things happen. You face a penalty by slip count, and the recipient’s return no longer matches anything, which can pull both of you into a review.

The Reconciliations That Should Agree

Some numbers exist in more than one place and are expected to tie. Where they do not, that is what surfaces.

Every one of these is a check you can run yourself before filing. A difference you find and explain in your working papers is a different situation from one the CRA finds and asks about.

The deposit line depends on the account being reconciled first, which is why monthly bank reconciliation sits underneath everything else here. A ledger that has never been agreed to the bank cannot support any of the other comparisons.

The revenue against sales tax line is the one that catches the most businesses, because the two returns are usually prepared at different times, sometimes by different people, and nobody compares them.

Red Flags in Your Own Numbers

Separate from matching, your return is compared against what is typical for a business of your type and size. None of the following is wrong in itself. Each simply invites a question, and the question is easier when you have the answer ready.

Margin and Ratio Signals

• Gross margin well below others in your sector
• Expenses high relative to revenue with no visible reason
• A sharp swing year over year in either direction
• Losses reported repeatedly while the business continues operating
• Revenue flat while purchases rise, or the reverse
• Owner drawings that do not correspond to reported profitability

The recurring loss item deserves care. Genuine losses happen, particularly in early years or a bad cycle. What attracts attention is a pattern of losses with no explanation, in a business that keeps trading and funding an owner’s lifestyle.

The answer is not to avoid reporting a loss. It is to be able to explain it, and to have the explanation in the file rather than only in your head.

Expense Signals

Round numbers are underrated as a signal. A ledger with several entries at exactly $5,000 and $10,000 reads as estimated rather than recorded, and an auditor will start there.

Cash and Deposits

Cash-intensive businesses attract more attention, not because cash is improper but because it is harder to verify.

• Deposits exceeding recorded revenue, with no explanation for the difference
• Revenue that appears too consistent to be real trading
• Purchases implying more sales than were reported
• Personal accounts used for business receipts
• Large unexplained transfers between accounts

Not every deposit is revenue. Loans, capital contributions, transfers between your own accounts and refunds all appear as deposits. Where they are not identified in the records, they look like unreported income until you prove otherwise.

Label them at the time. Reconstructing the character of a deposit three years later is considerably harder than describing it the week it arrived.

The Shareholder Loan

In owner-managed corporations this account collects everything nobody knew how to code, and it is where an audit tends to go next.

Amounts taken and not repaid within the period the Act allows can be included in your personal income. A growing balance with no supporting entries is both an audit signal and a real tax exposure.

Filing Behaviour

• Repeated late filing across income tax, sales tax or payroll
• Frequent amendments to returns already filed
• Large refund claims, particularly on sales tax
• Balances left outstanding for extended periods
• A return filed with obvious internal inconsistencies

Filing behaviour is visible without anyone examining your books at all, which makes it the cheapest signal for the CRA to act on and the cheapest for you to fix.

Sales Tax and Payroll Are Separate Programmes

Businesses think of “an audit” as one thing. In practice a GST/HST examination and a payroll examination are separate exercises with their own selection criteria, and either can arrive without an income tax audit.

GST/HST Selection

• A refund claim large relative to your trading history
• Sales reported for sales tax that do not agree with revenue on the corporate return
• Input tax credits high relative to the tax you collected
• Credits claimed on imports without the customs accounting document
• Zero-rated or exempt sales claimed with no supporting evidence
• Registration that came late relative to when the threshold was crossed
• Returns filed late or in an inconsistent pattern

Refund claims are the practical trigger. A business in a genuine refund position, such as an exporter or one in a build phase, should expect the claim to be reviewed at some point and should keep the supporting documentation assembled rather than scattered.

Documentation is the whole defence on a credit claim. Each credit needs an invoice showing the supplier’s registration number and the tax charged, and import credits need the customs accounting document rather than a broker’s summary. Our guide to maximising input tax credits during GST/HST filing covers what qualifies, and our overview of input tax credits in Canada sets out the recovery rules.

The Exempt Supply Problem

Whether your supplies are taxable or exempt changes everything, and it is frequently misunderstood.

The exempt row is where the errors sit. A business making exempt supplies cannot recover tax on its costs, and claiming credits anyway is a straightforward assessment.

Where a business makes both taxable and exempt supplies, credits have to be apportioned. That applies to dental practices with cosmetic work alongside exempt care, and to other mixed operations, and it is an area where a reasonable apportionment method should be documented rather than assumed.

Payroll Selection

Classification is the most consequential. A worker treated as a contractor who is in substance an employee means the CRA can assess the deductions that should have been withheld, plus penalties and interest, and directors are personally exposed on unremitted source deductions.

The test looks at control over how work is done, who provides the tools, whether the worker carries a chance of profit and risk of loss, and how integrated they are in the business. A written contract stating “independent contractor” does not settle it if the working relationship says otherwise.

The Trust Fund Point

Source deductions withheld from employees are not the company’s money. They are held in trust, and that is why the consequences of not remitting them are more severe than for ordinary tax debt, and why directors carry personal liability.

Of everything in this article, unremitted source deductions is the exposure that most often follows an owner personally out of a failed business.

Where Your Sector Draws Attention

Risk assessment is sector-aware, and each industry has a characteristic exposure. Knowing yours tells you where to concentrate.

Medical and Dental Practices

Most medical services are exempt for sales tax purposes, which means credits on costs generally cannot be recovered. Dental practices are the more complicated case, because cosmetic procedures can be taxable while care is exempt, creating a mixed supply position requiring apportionment.

On the income tax side, the recurring issues are personal costs run through the practice, income from multiple sources such as hospital work, teaching and consulting recorded inconsistently, and incorporation structures where the professional corporation’s rules were not followed.

Construction and Skilled Trades

Contract payment reporting makes this sector unusually visible. Where you pay subcontractors, those payments are reported, and where a subcontractor’s own return does not reflect them, the CRA can work backwards from your slip.

• File contract payment slips, six months after your chosen period end
• Confirm subcontractors are registered where the amounts warrant it
• Test whether long-term subcontractors are in substance employees
• Support holdbacks and progress billing with the contract terms
• Keep timesheets tied to jobs and contracts

Cash wages are the serious exposure here, and they carry both payroll and income tax consequences alongside the personal liability that attaches to unremitted deductions.

Real Estate and Property Development

Property transactions are visible through registry data, and this sector has been an area of sustained CRA focus.

The first row is the one that costs the most. Treating a gain as capital when the pattern of activity suggests a trading business can double the amount brought into income.

Restaurants and Cash Businesses

Purchases imply sales. A restaurant buying a given volume of food and drink is expected to have sold a corresponding volume, and the relationship between the two is testable without any third party involved.

Alongside that: tips and how they are handled, staff paid in cash, wastage written off without records, and meals claimed without the 50% limitation applied.

Transport and Logistics

Vehicle costs are the whole file. Without logs showing distance and purpose, a claim is unsupported regardless of how genuine the expense was.

Note also that a corporation does not prorate vehicle costs the way a sole proprietor does. The company claims the cost and reports a benefit where there is personal use, and applying the wrong method is common.

E-Commerce and Digital

Payment processors and marketplaces report independently, so gross sales are visible even where a business records only net payouts.

• Record sales at gross with processing fees as an expense
• Reconcile processor and marketplace reports to recorded revenue monthly
• Establish where customers are for sales tax purposes
• Track inventory properly, since cost of goods sold depends on it
• Support any home office arrangement rather than assuming one

Childcare and Similar Services

Childcare services are largely exempt for sales tax purposes, which means the usual issue is not failing to charge tax but claiming credits that are not available on exempt activity.

Payroll is the larger exposure in this sector: staff hours, casual and relief workers, and whether everyone paid is properly on the payroll system.

Lowering Your Risk and Working With Gondaliya CPA

Run the Checks Yourself

Everything the CRA matches, you can match first. Do it before filing rather than after.

A difference you find and document is not a red flag. It is an explained variance sitting in your working papers with the evidence attached.

Fixing a Backlog

Late filings and disorganised records raise risk on their own, and catching up lowers it. The order matters.

1. Assemble the source documents for every open period
2. Reconcile the bank accounts before preparing anything
3. Rebuild the ledger so the periods actually tie
4. Prepare and file the returns, oldest first
5. Deal with the balance owing and any relief available

Filing quickly with unreconciled numbers to appear compliant is a poor trade. It produces returns that will not withstand a review and often creates a second problem.

Where past filings were wrong, the Voluntary Disclosures Program may reduce penalties, provided you come forward before the CRA raises the issue. Once contact has been made on the matter, that option generally closes.

Who Prepares It Matters

The point is not that self-preparation is reckless. It is that the reconciliations described above are exactly what tends to get skipped when the person preparing the return is also running the business.

The errors that follow are consistent enough to list, and we have set them out in our review of the bookkeeping mistakes that raise CRA audit risk. Almost none of them involve any intent to underreport. They are omissions of process rather than judgement, which is what makes them straightforward to fix once someone is looking.

What We Do

We support incorporated businesses on a flat annual fee covering bookkeeping with monthly reconciliation, the cross-checks between revenue, sales tax, payroll and slips, expense documentation review, shareholder loan monitoring, worker classification review, sector-specific exposure, financial statements and the corporate return.

Where a letter has already arrived, we act as your representative and manage the file through to conclusion. Our step-by-step guide to the CRA audit process sets out what that involves.

Pricing is quoted before any work begins, including HST, with a one-business-day response.

What It Depends On

• The condition of the current records
• How many periods are outstanding, if any
• Transaction volume and number of accounts
• Whether payroll and sales tax are involved
• Sector complexity, including mixed taxable and exempt supplies

Getting Started

Bring your last filed corporate return, your most recent sales tax return, and a recent bank reconciliation. Those three let us run the main cross-checks and tell you where your file actually stands.

Contact Gondaliya CPA at info@gondaliyacpa.ca, call 647-212-9559, or send us a message.

FAQs on CRA Audit Triggers and Selection

The Risk Reduction Checklist

The Cross-Checks

• Reconcile revenue on the corporate return to sales reported for GST/HST.
• Reconcile wage expense to the total on slips filed.
• Reconcile payroll remittances to the payroll register.
• Reconcile subcontractor expense to contract payment slips issued.
• Reconcile import credits to the customs accounting documents.
• Compare total deposits to recorded revenue, identifying the difference.
• Record the explanation for any variance in the working papers.

The Signals You Control

• Label loans, transfers and refunds when the deposit arrives.
• Keep a vehicle log wherever vehicle costs are claimed.
• Apply the 50% limitation to meals and entertainment.
• Record the business purpose on travel and entertainment.
• Avoid round-number entries; post what was actually spent.
• Document reasonableness on related-party fees and rent.
• Keep personal spending out of the business accounts entirely.
• Review the shareholder loan quarterly and support each entry.
• Explain any recurring loss in the file, not just in your head.
• File on time across income tax, sales tax and payroll.

The Sector and Structural Items

• Confirm whether your supplies are taxable, zero-rated or exempt.
• Apportion credits on a documented basis where supplies are mixed.
• Test every long-term contractor against the classification factors.
• Remit source deductions on schedule; directors are personally liable.
• File contract payment slips six months after your period end.
• File T4 and T4A slips by the last day of February.
• Record sales at gross where processors report gross independently.
• Support capital against income treatment on property dispositions.
• Confirm rebate and self-supply positions before claiming.
• Keep six years of records, longer for capital property.
• Come forward before contact if you know a past filing was wrong.
• Reconcile monthly, since almost every issue is visible that month.

For a review of how your file looks before the CRA runs its own, contact Gondaliya CPA at info@gondaliyacpa.ca, call 647-212-9559, or book a free consultation.

Which signal dominates differs by the business. Here are ten and the usual exposure.

• Medical practices: Exempt supplies carry no recovery.
• Dental practices: Cosmetic and care are treated differently.
• Construction and trades: Your slips let them work backwards.
• Real estate and development: Registry data makes it visible.
• Restaurants and bars: What you bought implies what you sold.
• Transport and logistics: No log means no claim.
• E-commerce sellers: Gross is reported whether you record it or not.
• Childcare providers: The risk is credits, not uncharged tax.
• Importers: The customs document is the support.
• Any owner-managed corporation: It collects what nobody could code.

Professional Guidance: How Gondaliya CPA Lowers Your Audit Risk

Small businesses get selected in a predictable set of ways: revenue on the corporate return that does not agree with sales reported on GST/HST filings, wage expense that does not tie to the slips actually filed, subcontractor payments reported through contract slips that the recipient never reflected, bank deposits from loans and transfers that were never labelled and therefore look like unreported income, input tax credits claimed on activity that is exempt and carries no recovery, contractors who are in substance employees, vehicle claims with no log behind them, and a shareholder loan account collecting whatever nobody could code. Gondaliya CPA reduces that exposure on a fixed annual fee.

We handle what decides the outcome: running the same cross-checks the CRA runs, before filing rather than after, reconciling revenue to sales tax and wages to slips, identifying every deposit that is not revenue, confirming whether your supplies are taxable or exempt and apportioning credits where mixed, testing worker classification, reviewing the shareholder loan quarterly and documenting the explanation for any variance in the working papers.

Our team starts with your last corporate return, your most recent sales tax return and a bank reconciliation. Those three run the main checks and tell you where your file actually stands. Whatever your sector, you get clear advice and a fixed price before we start.

Quick Answers

• Selection: Data matching, not instinct
• Biggest gap: Revenue against sales tax filings
• Deposits: Label what is not revenue
• Losses: Fine, if explained in the file
• Exempt supplies: No credit recovery
• Classification: The relationship, not the contract
• T5018: Six months after period end
• T4 and T4A: Last day of February
• Scoring models: Not published; invented
• Random selection: Real, so stay ready

Who This Is For

• For: Incorporated Canadian small businesses wanting to understand how selection works and reduce their exposure before a letter arrives.
• Not For: Matters already under enforcement or involving allegations requiring legal counsel, and any expectation that risk can be reduced to zero, since random selection is real.

People Also Ask

Glossary of Key Terms

• Information matching: Comparing your return to data filed by others.
• Risk assessment: Comparing your figures against sector patterns.
• Random selection: Files chosen without any risk indicator.
• T4 and T4A: Slips for employment income and fees for services.
• T5018: Contract payment reporting in construction.
• Taxable supply: A sale carrying tax, with credits recoverable.
• Zero-rated supply: Taxed at nil, with credits still recoverable.
• Exempt supply: No tax charged and no credits recoverable.
• Apportionment: Splitting credits where supplies are mixed.
• Worker classification: Whether someone is an employee or contractor.
• Source deductions: Amounts withheld and held in trust for the CRA.
• Director liability: Personal exposure for unremitted trust amounts.
• Shareholder loan: Company funds used personally, taxable if not repaid.
• Self-supply: Sales tax rules where new housing is rented rather than sold.
• Capital against income: Whether a gain is a capital gain or business profit.
• Voluntary Disclosures Program: Correcting filings before CRA contact.

CRA Audit Risk Check

This quick self-check indicates where your operation most likely has room. Please answer the six questions below.

Want a checklist to work from? You can download our free CRA audit red flags checklist before your consultation.

CRA Audit Triggers Canada: How Gondaliya CPA Reduces Your Exposure

Next Steps

Please book a free consultation with Gondaliya CPA and bring your last filed corporate return, your most recent sales tax return, and a recent bank reconciliation. Those three let us run the main cross-checks, show how your file looks to the CRA, and identify what remains to claim on the equipment, and where the documentation is thin. You will get a flat annual fee including HST before any work begins. If our content helps, please add gondaliyacpa.ca as a preferred source on Google.

Published: June 1, 2026  ·  Last updated: June 1, 2026

Editorial policy: We research against CRA and CPA Ontario sources, fact-check the figures, and Sharad Gondaliya, CPA, reviews the content, which we update as the rules change.

Disclaimer: This article is educational information only and is not tax, legal, or financial advice. Figures marked illustrative are examples rather than quotes or guarantees. It reflects CRA rules current to 2026, including the $30,000 GST/HST threshold, the Class 8 rate, Class 13 leasehold treatment, the half-year rule, and the six-year retention requirement. Rates, limits and expensing rules change and outcomes depend on your specific facts. Please consult a CPA Ontario member before acting.