Insights
Dec 5, 2025
Mackisen

MONTREAL CPA FIRM NEAR YOU: COMMON RED FLAGS THAT CAN TRIGGER A CRA AUDIT IN SMALL BUSINESSES

Introduction to CRA Audit Red Flags
Understanding common red flags that can trigger a CRA audit is essential for Montreal small business owners. CRA closely monitors irregularities in tax filings, deductions, and reporting practices. Montreal CPAs help identify potential risk areas, provide proactive strategies to avoid audits, and ensure compliance with federal and provincial tax laws.
Income Reporting Irregularities
One of the most common audit triggers is inconsistent income reporting. Significant fluctuations, missing entries, or unreported income can alert CRA auditors. Montreal CPAs review accounting records to reconcile discrepancies, ensuring accurate reporting while protecting businesses from unnecessary scrutiny.
Excessive Deductions and Expenses
High expense claims relative to income levels can raise red flags. Deductions that appear unusually high or unsupported by documentation may prompt an audit. Montreal CPAs help clients substantiate expenses, maintain receipts, and justify business costs to avoid audit attention.
Unusual Year-Over-Year Changes
Abrupt changes in revenue, deductions, or reported profits may signal irregularities to CRA. Montreal CPAs conduct detailed financial analyses to explain variations and prepare documentation that supports legitimate business changes, reducing audit risk.
Business Use of Home Deductions
Claiming business-use-of-home expenses improperly can attract CRA scrutiny. Montreal CPAs guide small business owners in correctly calculating eligible portions, documenting usage, and aligning claims with regulations to avoid penalties and audits.
Vehicle and Travel Expenses
Vehicle and travel deductions are commonly audited. Montreal CPAs assist in tracking mileage, maintaining logs, and substantiating business-related travel to ensure claims are compliant and defensible during audits.
GST/HST and QST Reporting Issues
Errors in GST/HST or QST filings are frequent audit triggers. Montreal CPAs review input tax credits, remittance schedules, and reporting accuracy to prevent discrepancies that could lead to CRA attention.
Payroll and Employee Benefit Misclassification
Incorrect employee classification or misreported benefits can generate audit flags. Montreal CPAs examine payroll, T4/RL-1 filings, and employee benefits to ensure compliance and reduce the likelihood of reassessment.
Transactions with Related Parties
Business dealings with family members or related entities require careful documentation. Montreal CPAs ensure transactions are at arm’s length, properly recorded, and justified to prevent CRA from questioning their legitimacy.
Large or Non-Routine Transactions
Significant one-time transactions, such as asset sales or capital investments, may trigger audits. Montreal CPAs provide pre-transaction analysis, recordkeeping guidance, and reporting strategies to ensure these are transparent and compliant.
Claiming Multiple Tax Credits
Claiming numerous tax credits simultaneously can attract CRA attention. Montreal CPAs advise clients on which credits are eligible, how to claim them correctly, and how to maintain documentation that validates these claims.
Foreign Income and Assets
Reporting foreign income incorrectly or failing to disclose foreign assets triggers audit scrutiny. Montreal CPAs guide clients through reporting obligations, T1135 filings, and compliance strategies to prevent penalties.
Inconsistent Recordkeeping
Poorly organized or incomplete records are one of the easiest ways to trigger an audit. Montreal CPAs establish structured recordkeeping systems, ensuring all transactions are documented, reconciled, and easily retrievable for CRA review.
High Cash Transactions
Businesses that frequently deal in large cash amounts are more likely to be audited. Montreal CPAs advise on documenting cash transactions, implementing internal controls, and reporting income accurately to maintain compliance.
Industry-Specific Risks
Certain industries, such as restaurants, retail, and construction, face higher audit risk due to cash handling or subcontractor payments. Montreal CPAs provide industry-specific guidance to prevent common errors and audit triggers.
Non-Resident and Cross-Border Activities
Business activities involving non-residents or cross-border transactions may trigger audits if reporting is incomplete. Montreal CPAs guide compliance with international tax obligations, withholding requirements, and documentation for foreign transactions.
Reimbursement Claims and Advances
Improperly documented reimbursement claims or advances can generate red flags. Montreal CPAs ensure clear policies, accurate reporting, and proper documentation to validate these transactions.
Unusual Depreciation or Capital Cost Allowances
Claims for unusually high CCA or accelerated depreciation may be scrutinized. Montreal CPAs review asset schedules, ensure compliance with CRA guidelines, and substantiate claims with supporting documentation.
Late or Incomplete Filings
Late filing of tax returns or incomplete reporting increases audit likelihood. Montreal CPAs help maintain filing deadlines, organize submissions, and prevent errors that could draw CRA attention.
Financial Ratios Outside Norms
Unusual financial ratios, such as high expense-to-income ratios, may prompt audits. Montreal CPAs analyze financial statements, identify legitimate variations, and maintain documentation to explain anomalies.
Why Choose Mackisen
Mackisen assists Montreal businesses in proactively identifying audit risks and implementing strategies to avoid them. Our CPA team provides comprehensive guidance on recordkeeping, reporting accuracy, and compliance with CRA and Revenu Québec regulations. Choosing Mackisen ensures professional, reliable, and strategic support to safeguard your business and minimize audit exposure.

