Find an Audit Firm in Canada

Choosing an audit firm is not the same as hiring a bookkeeper or a tax preparer. Auditors have legal obligations to third parties — your bank, your investors, your funders — and the opinion they issue carries significant professional and legal weight. Here is what to evaluate before signing an engagement letter.

CPA designation and public accounting licence

In Canada, only firms holding a public accounting licence issued by a provincial CPA body can sign audit reports. This is a legal requirement, not just a credential. Confirm that the engagement partner — the CPA who will sign your audit report — is registered in your province. If your company operates across multiple provinces, the signing partner must hold a licence in the province where the report is issued.

Experience in your industry

Audit standards are the same across industries, but accounting issues vary enormously. A firm that audits construction companies understands percentage-of-completion revenue recognition and bonding requirements. A firm that audits non-profits knows restricted fund accounting and T3010 reporting. A firm that does SOC 2 audits has an IT audit team familiar with cloud security controls. Ask prospective firms about their client roster in your sector — not for names, but for the proportion of their practice serving organizations like yours.

Peer review and quality controls

CPA provincial bodies require audit firms to undergo practice inspections (peer reviews). Ask when the firm's most recent review was conducted and whether any deficiencies were noted. Firms with clean inspection records and strong internal quality controls produce more reliable work. For public company audits, firms must also be registered with the Canadian Public Accountability Board (CPAB), which conducts its own inspections.

Independence requirements

Auditors must be independent of the organizations they audit. This means they cannot own shares in your company, cannot have loans from your company, and cannot provide certain non-audit services (like bookkeeping) to clients they audit. Independence rules exist to protect the integrity of the audit opinion. If a firm offers to do your bookkeeping and your audit, be cautious — they may not be independent under the rules, which voids the audit opinion.

References and responsiveness

Ask for two or three client references in your industry. When you speak to those references, ask specifically about responsiveness during the audit, how they handled issues they found, and whether they delivered on time. Audit timeliness matters — if you need audited financial statements to renew a credit facility by a specific date, a firm that misses that deadline costs you real money.

Engagement team continuity

Large firms assign junior staff to most audit work, with seniors and partners reviewing. Ask who will actually be on-site at your office. High staff turnover at a firm means you re-explain your business every year. Mid-tier firms often provide better engagement continuity — the same manager handles your file for several years, building real knowledge of your operations.

Fee structure and scope clarity

Audit fees should be quoted after a scoping conversation, not from a rate card. A firm that quotes without understanding your accounting software, number of transactions, number of entities, and prior-year issues will almost certainly over-run. Request a fixed-fee or capped-fee arrangement with a clear scope of work. Understand what triggers additional fees — typically, material changes in your business, prior-year adjustments that require restatement, or delays caused by missing information on your end.