Receiving a letter from CRA requesting a payroll audit review can be alarming for any business owner. A CRA payroll audit (also called a source deduction audit or employer compliance audit) examines whether you have correctly withheld, remitted, and reported payroll-related amounts — employee income tax, Canada Pension Plan (CPP) contributions, and Employment Insurance (EI) premiums. The scope can extend to employment benefit compliance, contractor classification, and the treatment of shareholder benefits. Understanding what CRA looks for and how to prepare can make the difference between a clean close and a costly reassessment.
What Triggers a CRA Payroll Audit?
CRA selects businesses for payroll audits through both random selection and risk-based criteria. Common triggers include:
- Significant use of contractors — businesses that pay contractors large amounts but have no employees are frequently targeted, as CRA suspects some contractors may be misclassified employees
- Inconsistencies between T4 totals and remittances — if T4 box amounts do not reconcile with your payroll remittances for the year, this raises a flag
- Missing or late T4 filings — late or unfiled T4 slips and summaries are a direct trigger
- Industry-specific targeting — CRA periodically focuses on specific industries (construction, trucking, cleaning services) where employee misclassification is common
- Complaints from former employees or contractors — a disgruntled worker who believes they should have been treated as an employee may file a CPP/EI ruling request with CRA
- Cross-referencing T4A slips — CRA matches T4A slips issued to contractors against the contractors' own T1 returns
What Does a Payroll Audit Examine?
A CRA payroll auditor will typically request the following records:
- Payroll ledger and payroll summaries for the audit period (typically 3–5 years)
- T4 and T4A slips and summaries filed
- Bank statements showing payroll disbursements and remittance payments
- General ledger payroll and contractor expense accounts
- Contracts with independent contractors
- Evidence of benefits provided to employees (group insurance, car allowances, housing, etc.)
- Records of shareholder loans and shareholder benefits
Employee vs. Independent Contractor: The Core Issue
The most contentious and consequential area in a payroll audit is worker classification. If CRA determines that workers you treated as independent contractors are actually employees, you become liable for:
- The employer's share of CPP contributions on all amounts paid
- The employer's share of EI premiums on all amounts paid
- Penalties and interest on the unpaid remittances
- Potentially, the employee's share of CPP and EI if it was not withheld (which the employer may not be able to recover from the worker)
CRA applies a multi-factor test to determine employment status, looking at:
- Control: Does the payer direct how, when, and where the work is done?
- Ownership of tools: Does the worker provide their own tools and equipment?
- Chance of profit/risk of loss: Can the worker profit or lose money on the engagement?
- Integration: Is the worker's work integral to the payer's business?
- Intention: Did both parties intend to create an independent contractor relationship, and is the contractual intent supported by the actual working arrangement?
A written contract stating "independent contractor" is helpful but not determinative. CRA will look at the actual substance of the working relationship.
Taxable Benefits: A Frequently Missed Area
Payroll audits often uncover unreported taxable employee benefits that were provided but not included on T4 slips. Common examples:
- Personal use of a company vehicle (standby charge and operating cost benefit)
- Housing or accommodation provided to employees
- Low-interest or interest-free loans
- Group term life insurance premiums above the exempt threshold
- Shareholder benefits — amounts the corporation paid for the personal benefit of a shareholder-employee
If taxable benefits were not included on T4 Box 40 and not reported to CRA, the employer will be assessed for the income tax that should have been withheld, plus CPP and EI where applicable, plus penalties and interest.
How to Prepare for a CRA Payroll Audit
- Organize your payroll records for the requested audit period before the auditor arrives or submits their document request list
- Reconcile T4 totals to your payroll ledger and your remittance payments — resolve any discrepancies before the audit begins
- Review contractor agreements for completeness and consistency with the actual working arrangement
- Identify unreported benefits and consider voluntarily amending T4s before the audit to reduce penalties
- Engage a professional accountant or tax lawyer to represent you during the audit
- Do not provide more documentation than requested — answer the auditor's questions accurately but do not volunteer information outside the scope of their request
Responding to a Payroll Audit Assessment
If the auditor proposes an assessment, you have the right to submit a response before the assessment is finalized. This is the most important opportunity to correct errors in the auditor's analysis — for example, to provide additional evidence that a worker was genuinely an independent contractor, or that a benefit was exempt from tax.
Once a formal Notice of Assessment is issued, you can file a Notice of Objection within 90 days. At Swift Accounting Ltd. Calgary, we assist employers through CRA payroll audits from initial document requests through objections and appeals, including contractor classification analyses and benefit calculations.
Frequently Asked Questions
How far back can CRA audit my payroll?
CRA can generally audit payroll records for the current year and the three preceding calendar years (a four-year window). However, if CRA believes there has been fraud or wilful misrepresentation, there is no limitation period — they can go back as far as they choose. For most ordinary audits, the focus is on the most recent three to four years.
If CRA reclassifies my contractors as employees, can I recover the CPP/EI from them?
Legally, you may have a claim against the workers for the employee share of CPP and EI that should have been withheld. In practice, recovering those amounts from former workers is difficult and costly. The employer typically absorbs the full reassessment and pursues the workers separately (or not at all). This is one reason why getting worker classification right at the start is so important.
What is a CRA ruling request and how does it help?
You can proactively ask CRA for a CPP/EI ruling to confirm whether a specific worker is an employee or independent contractor. The ruling is legally binding on CRA. While it takes time and requires full disclosure of the working relationship, it provides certainty and protects you from a future audit challenge on that specific engagement. Rulings are particularly useful for long-term, high-value contractor relationships.
Can I reduce penalties if I voluntarily correct payroll errors before an audit?
Yes — under CRA's Voluntary Disclosures Program (VDP), employers who disclose payroll errors before CRA contacts them may qualify for relief from gross negligence penalties and, in some cases, interest relief. The disclosure must be voluntary (CRA must not have already started examining the issue), complete, and involve a penalty. A tax professional can help you assess whether a VDP application is appropriate.
A payroll audit does not have to result in a large reassessment — but preparation and professional representation make a critical difference. The team at Swift Accounting Ltd. Calgary helps employers navigate CRA payroll audits, correct compliance gaps, and respond to reassessments. Contact us today for professional payroll compliance support.