Solicitor-Client Privilege in a CRA Audit: What's Protected in Ontario

When a CRA audit turns up communications with your lawyer, a natural question is whether you have to hand them over. In many cases, the answer is no — solicitor-client privilege protects genuine legal advice communications from disclosure, including to the CRA. But the privilege has real limits, and asserting it incorrectly can do more harm than simply producing the document would have.

This guide explains what's actually protected, what commonly isn't, and how to handle a CRA demand that might reach privileged material.

What Solicitor-Client Privilege Protects

At its core, solicitor-client privilege protects confidential communications between a client and their lawyer made for the purpose of seeking or giving legal advice. In the audit context, this typically includes:

• Correspondence with your lawyer discussing your legal position, strategy, or exposure
• Legal opinions or memoranda prepared by your lawyer analyzing your situation
• Notes of conversations with your lawyer about the audit or a related dispute
• Draft documents prepared by, or at the direction of, your lawyer for the purpose of giving legal advice

The privilege belongs to the client, not the lawyer, which means only you can waive it — your lawyer cannot voluntarily disclose privileged material without your consent (and generally shouldn't even if you asked, absent narrow exceptions).

What Is Not Protected

This is where taxpayers most often get it wrong. Privilege attaches to the legal-advice communication itself, not to every document that happens to pass through a lawyer's hands. Commonly unprotected material includes:

• The underlying facts and records. You can't shield a receipt, invoice, or bank statement from disclosure simply by giving it to your lawyer. If the CRA could have demanded it directly from you, routing it through counsel doesn't change that.
• Accounting advice. Privilege generally protects legal advice, not accounting or bookkeeping advice — even where the same professional happens to hold both a legal and accounting credential, or where an accountant is working alongside a lawyer.
• Business or commercial advice, as opposed to legal advice, even if it comes from a lawyer.
• Communications made to further a fraud or illegal act. Privilege does not protect communications used to plan or facilitate an offence — a narrow but important exception.
• Documents where privilege has already been waived, including by voluntarily sharing them with a third party outside the privileged relationship.

A common and costly mistake is assuming that copying a lawyer on an email, or asking a lawyer to "review" a document, retroactively cloaks it in privilege. It doesn't. The underlying facts remain producible; only genuine legal-advice communications about them are protected.

How Privilege Interacts With a CRA Audit or Formal Demand

The CRA has broad statutory authority to demand documents and information during an audit, including through a formal Requirement for Information. But that authority does not override validly claimed privilege. When a CRA demand appears to reach material you believe is privileged:

1. Identify the specific documents or portions you say are privileged — a blanket, unsupported claim of privilege over an entire file is unlikely to be accepted and can undermine your credibility on the documents that are genuinely protected.
2. Produce everything that isn't privileged. Withholding non-privileged material alongside privileged material, or refusing to engage at all, treats a narrow protection as a reason to stonewall — which it is not.
3. Follow the proper procedure for asserting privilege, rather than simply not responding. There are established mechanisms for identifying withheld documents and, where the CRA disputes the claim, resolving the disagreement — often by having the disputed material reviewed independently rather than simply handed over or simply withheld.
4. Get legal advice before responding if you're unsure whether something qualifies. Getting a privilege claim wrong — either by over-claiming or by inadvertently waiving it — can be difficult to undo.

Common Privilege Pitfalls in an Audit

• [ ] Assuming everything sent to or from a lawyer is automatically privileged
• [ ] Discussing a privileged legal opinion with a third party (a business partner, a friend), which can waive the privilege
• [ ] Attaching underlying business records to a privileged email and then claiming the whole email chain is protected
• [ ] Failing to properly log withheld documents, leading the CRA to challenge the privilege claim on procedural grounds
• [ ] Confusing accounting advice from a professional accountant with legal advice — the two are treated very differently for privilege purposes

Frequently asked questions