When you share sensitive financial information with your accountant during tax planning, that information is generally not protected from CRA if it is later requested through an audit or court order. But when that same information is shared with a lawyer for the purpose of obtaining legal advice, it may be protected by solicitor-client privilege — one of the most fundamental rights in the Canadian legal system. Understanding this distinction is critical for any business owner or high-net-worth individual engaged in tax planning.
Solicitor-client privilege (SCP) protects confidential communications between a lawyer and their client where the communication was made for the purpose of obtaining or giving legal advice. It is an absolute right — not a qualified one. Once established, CRA (and the courts) cannot compel disclosure of privileged communications.
The Supreme Court of Canada has described SCP as a fundamental civil and legal right that is critical to the proper functioning of the legal system. It applies to oral and written communications, notes, and documents prepared in the context of the solicitor-client relationship.
For a communication to be privileged, three conditions must be met:
This is where many taxpayers are surprised. Work product prepared by a tax professional — tax opinions, planning memoranda, engagement files, working papers — is generally not protected by SCP. CRA can require your tax professional to produce their engagement files and working papers through a Requirement to Provide Information notice.
By contrast, communications with a tax lawyer specifically seeking legal advice on the same topic are protected. A legal tax opinion prepared by a lawyer is privileged. A tax opinion prepared by a tax professional is not.
| Advisor | Communication Type | Privileged? |
|---|---|---|
| Tax lawyer | Legal advice memo | Yes — SCP applies |
| Tax professional / accountant | Tax planning memo | No — not privileged |
| Tax professional / accountant | Prepared financial statements | No |
| Tax lawyer | Document prepared for accountant to use | May lose privilege — shared broadly |
| In-house counsel | Internal legal memo | Yes — if purely legal advice |
Litigation privilege is a related but distinct protection. It protects documents and communications created for the dominant purpose of anticipated or existing litigation — including tax litigation or anticipated CRA proceedings. Unlike SCP, litigation privilege is temporary; it expires when the litigation ends. It can protect documents prepared by tax professionals (not just lawyers) if they were created in anticipation of litigation.
When a CRA audit is underway and litigation is reasonably anticipated, documents prepared as part of the audit defense strategy may benefit from litigation privilege — making it worth engaging legal counsel early in complex audits.
Privilege can be waived — intentionally or inadvertently — by the client. Sharing a privileged document with third parties (including your tax professional, if they are not acting under the lawyer's supervision) can constitute waiver. Using a privileged communication as part of a business transaction, or selectively disclosing parts of a privileged opinion, can also waive privilege over the entire communication.
The most effective tax dispute and planning teams combine both tax professionals and lawyers. Tax professionals handle the technical accounting, prepare financial analyses, and ensure compliance; lawyers provide legal opinions and manage the privileged communications. Our Calgary tax firm works alongside tax lawyers on complex matters, structuring the engagement to preserve privilege where appropriate. Contact us if you are facing a significant CRA audit or planning a major transaction where privilege may be relevant.