Not every CRA audit works the same way. The Canada Revenue Agency uses different types of audits depending on the complexity of your tax return, the risk level, and the specific area under review. Understanding the type of CRA audit you are facing helps you prepare the right documents, set realistic timelines, and decide whether you need professional help.
This guide breaks down the main types of CRA audits, what each one involves, and what to expect.
Key Takeaways
- The CRA conducts several types of audits, each with a different scope, method, and timeline.
- A desk audit is the most common and is handled entirely by mail or phone.
- A field audit is more comprehensive: a CRA auditor visits your business or home in person.
- GST/HST audits and payroll audits target specific compliance areas, not your entire return.
- A net worth audit is an indirect method the CRA uses when it suspects unreported income.
What Is a CRA Audit?
A CRA audit is a formal review of your tax return and supporting records by the Canada Revenue Agency. The CRA verifies that you have accurately reported your income, deductions, and credits under the Income Tax Act. An audit can cover a single line item or your entire financial picture. It depends on what triggered the review.
If you have received a CRA audit letter, the first step is to read it carefully and understand which type of audit you are dealing with. For a full walkthrough, see our CRA audit letter guide.
Desk Audit
A desk audit (also called an office audit) is the most common type of CRA audit. It is conducted entirely through correspondence: by mail, phone, or through CRA My Account. The CRA auditor reviews specific items on your tax return and requests supporting documents.
Desk audits typically focus on a single area of concern:
- Charitable donation receipts
- Medical expense claims
- Home office deductions
- Rental income and expenses
- Business expense deductions
You are asked to mail or upload the requested records. There is no in-person meeting. A desk audit usually takes two to four months from start to finish.
What to do: Respond by the deadline on the letter. Send clear, organized copies of your receipts and records. If the CRA is satisfied, the audit closes with no changes to your return.
Field Audit
A field audit is more thorough than a desk audit. A CRA auditor visits your place of business, your home office, or your accountant’s office to conduct an in-person review of your books and records.
Field audits are reserved for higher-risk or more complex cases:
- Businesses with significant revenue
- Returns with large or unusual deductions
- Industry-specific compliance campaigns (e.g., construction, real estate, restaurants)
- Situations where the CRA suspects unreported income
During a field audit, the CRA auditor may review your bank statements, invoices, contracts, general ledger, and payroll records. The auditor may also interview you or your staff. Field audits typically last six to eighteen months, depending on the complexity.
What to do: You have the right to have a representative present: your CPA or a CRA audit representative can speak to the auditor on your behalf. Prepare a clean workspace, organize your records by year and category, and do not volunteer information beyond what is asked.
GST/HST Audit
A GST/HST audit focuses specifically on whether you have correctly collected, reported, and remitted GST/HST. The CRA checks your sales records against your GST/HST returns and verifies that your input tax credits (ITCs) are legitimate.
Common issues the CRA looks for include:
- Underreported sales
- Overclaimed ITCs
- Failure to register for GST/HST when required
- Errors in the timing of GST/HST remittances
GST/HST audits can be conducted as a desk audit or as part of a broader field audit. If you operate a business with significant sales volume, this is one of the more common types of audits you may face.
Payroll Audit
A payroll audit targets employers specifically. The CRA verifies that you are correctly withholding and remitting income tax, Canada Pension Plan (CPP) contributions, and Employment Insurance (EI) premiums for your employees.
The CRA also checks for:
- Misclassification of employees as independent contractors
- Unreported taxable benefits (e.g., personal use of a company vehicle, employer-paid insurance)
- Late or missed remittances
If the CRA determines you have misclassified a worker, you may owe back CPP, EI, and income tax withholdings, plus interest and penalties.
Net Worth Audit
A net worth audit is an indirect verification method the CRA uses when it believes a taxpayer has unreported income. Instead of reviewing your receipts line by line, the CRA auditor calculates your net worth at the beginning and end of the tax year, including assets, liabilities, and personal living expenses.
If the increase in your net worth exceeds your reported income (after accounting for non-taxable sources like gifts or inheritances), the CRA treats the gap as unreported income.
Net worth audits are typically triggered when:
- Your reported income does not support your lifestyle or asset purchases
- You operate a cash-heavy business
- There are unexplained bank deposits
This is one of the most serious types of CRA audits. If you are facing a net worth assessment, professional representation is strongly recommended.
Comparison: Types of CRA Audits at a Glance
| Type | Method | Scope | Typical Timeline |
|---|---|---|---|
| Desk audit | Mail / phone / CRA My Account | Specific line items | 2–4 months |
| Field audit | In-person at your location | Broad: books, records, interviews | 6–18 months |
| GST/HST audit | Desk or field | Sales tax compliance | 3–12 months |
| Payroll audit | Desk or field | Withholdings, remittances, worker classification | 3–6 months |
| Net worth audit | Field (usually) | Indirect: lifestyle vs. reported income | 12–24 months |
Frequently Asked Questions
What is the most common type of CRA audit?
The desk audit is the most common. The CRA sends you a letter requesting documents for a specific item on your tax return, such as charitable donations, medical expenses, or business deductions. You respond by mail or through My Account, and the review is handled without an in-person meeting.
How long does a CRA audit take?
It depends on the type. A desk audit can wrap up in two to four months. A field audit typically takes six to eighteen months. Net worth audits and complex business audits can take two years or more.
Can a desk audit turn into a field audit?
Yes. If the CRA finds issues during a desk audit that suggest broader problems, like unreported income or missing records, the auditor may escalate to a field audit for a more comprehensive review.
Do I need a CPA or lawyer for a CRA audit?
For a straightforward desk audit, you can often handle it yourself by providing the requested documents. For a field audit, GST/HST audit, or net worth audit, professional representation is strongly recommended. A CPA or tax professional can manage communications with the CRA auditor and protect your interests.
Conclusion
- The type of CRA audit you face determines how to prepare and respond.
- Desk audits are routine: respond with clear documentation and they usually resolve quickly.
- Field audits, GST/HST audits, and net worth audits are more serious and benefit from professional help.
- Know your rights: you can have a representative present at every stage.
Have questions about a CRA audit? Reach out to our team to discuss your situation.
