The CRA Audit Process and Your Rights as a Canadian Taxpayer

Receiving a CRA audit notice can feel overwhelming. But the CRA audit process is more structured than most people realize — and as a taxpayer you have meaningful legal rights throughout every stage. Knowing what to expect, and what the CRA is and is not entitled to do, puts you in a far stronger position to protect your interests.

This article walks Ontario taxpayers through the audit process from start to finish, and explains the rights the Taxpayer Bill of Rights and the Income Tax Act give you along the way.

Stage 1: The Audit Notice

The CRA's first contact is almost always in writing — a letter or notice telling you:

• Which tax year (or years) are under review
• What type of audit is being conducted (correspondence or field)
• What documents or information the auditor wants
• A deadline for your response

You should not ignore this letter. Missing the response deadline can result in the CRA making assumptions that disadvantage you and issuing a reassessment based on incomplete information.

Tip: Read the notice carefully. Auditors are only entitled to information that is relevant to the taxation years and issues identified in the notice. You are not obligated to hand over everything in your filing cabinets.

Stage 2: Providing Documents and Information

What CRA can request

The CRA has broad statutory powers to compel the production of records and information that are relevant to a taxpayer's tax obligations. This includes:

• Bank statements and account records
• Invoices, receipts, and contracts
• Payroll records and employment agreements
• Corporate minute books (for business audits)
• Electronic records, including accounting software files

What you are NOT required to provide

Solicitor-client privilege is real and enforceable. If you have communicated with a lawyer about your tax situation, those communications are privileged. You are not required to disclose them to the CRA — even during an audit. This is a constitutionally protected right in Canada.

You are also not required to answer questions in a way that would be self-incriminating in a criminal matter. If the audit appears to be moving toward a criminal investigation, consult a lawyer immediately before saying anything further.

Third-party record audits

If the CRA wants records from a third party (your bank, for example) rather than from you directly, it must follow a specific process and generally give you notice. You may have the opportunity to object to a third-party requirement before it takes effect.

Stage 3: The Auditor's Review

Once you submit documents, the auditor reviews them and may:

• Ask follow-up questions in writing or by phone
• Request additional records if gaps are identified
• Conduct an on-site visit (in a field audit)

Your right to be treated professionally

The CRA's Taxpayer Bill of Rights gives you the right to be treated with courtesy and respect. Auditors are not permitted to harass or intimidate you. If an auditor behaves unproperly, you can file a service complaint with the CRA, or escalate to the Office of the Taxpayers' Ombudsperson — an independent federal office that investigates complaints about CRA service.

Keeping a record

Write down the date, time, and substance of every conversation with the auditor. If anything important is said verbally, follow up in writing to confirm it. Good documentation protects you if the audit result is later disputed.

Stage 4: Proposal Letter

Before issuing a formal reassessment, the CRA auditor is generally required to send you a proposal letter (sometimes called a "30-day letter"). This letter explains:

• The proposed adjustments the auditor intends to make
• The reasoning behind those adjustments
• The additional taxes, interest, and penalties (if any) being proposed

You then have an opportunity to respond — to provide additional documents, correct factual errors, or make legal arguments before the reassessment is finalized. This is a critical stage. A well-prepared response at the proposal stage can resolve the dispute without ever needing a formal objection.

Stage 5: The Notice of Reassessment

If the auditor proceeds, the CRA issues a Notice of Reassessment showing the revised tax owing (plus interest and, in some cases, penalties). This document starts important legal clocks running.

You have the right to object to a reassessment you believe is wrong. The deadline to file a Notice of Objection is generally 90 days from the date of the reassessment (as of writing — verify this deadline immediately with the CRA or a tax professional, as it is strictly enforced and missing it can cost you the right to appeal).

Your Core Rights During a CRA Audit

The federal Taxpayer Bill of Rights includes 16 rights. The most important in an audit context:

• Right to accurate information: You are entitled to receive complete and correct information from the CRA.
• Right to confidentiality: Your tax information cannot be shared improperly.
• Right to be represented: You can have a lawyer, accountant, or other authorized representative deal with the CRA on your behalf. You do not have to speak to the auditor directly.
• Right to complain: If you believe the CRA has acted improperly, you can use the Service Complaint process or contact the Taxpayers' Ombudsperson.
• Right to appeal: You have statutory rights to object and, if necessary, appeal to the Tax Court of Canada.

Frequently asked questions