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Find a Lawyer » Canada Legal Guides » Money, Taxes & IP Canada » CRA Tax Disputes & Audits Canada » What to Do if You Discover an Error While Currently Under CRA Audit in Canada

What to Do if You Discover an Error While Currently Under CRA Audit in Canada

20 Jun 2026 4 min read No comments CRA Tax Disputes & Audits Canada
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If you discover an accounting mistake while currently under a Canada Revenue Agency (CRA) audit, self-disclosing the error directly to the auditor is usually the safest strategy. Because the audit has already started, you are legally disqualified from using the Voluntary Disclosures Program (VDP), but coming forward can still help you avoid massive 50% Gross Negligence Penalties.

Going through a tax audit is arguably one of the most stressful experiences for any Canadian business owner or individual. Whether you run a construction company in Calgary or a tech startup in Toronto, having a government official scrutinise your financial books is nerve-wracking. However, pure panic sets in when you are reviewing your own files and suddenly realise you made a significant mistake-like forgetting to report a large cash payment or accidentally double-deducting an expense.

When this happens, your first instinct might be to hide the error and hope the auditor does not notice. This is almost always a terrible idea. If the CRA discovers a hidden error during an active investigation, they will likely assume it was intentional fraud rather than a simple mistake. It is highly recommended to seek immediate counsel from an experienced Canadian tax lawyer in our directory to help you manage the disclosure and protect your legal rights. 👨‍⚖️

Step-by-Step Process for Disclosing an Error During a CRA Audit

Dealing with the Canada Revenue Agency requires a strategic, formal approach. You are no longer flying under the radar; the auditor is actively watching your file. Here is how most legal professionals handle an active audit error discovery across Canada.

Step 1: Pause and Quantify the Mistake

Before doing anything, you need to understand the exact scope of the error. Did you miss $500 in income, or $50,000? Gather the missing invoices, bank statements, or receipts. You must determine exactly how this error affects your tax return for the specific years the CRA is currently auditing. 📊

Step 2: Secure Solicitor-Client Privilege

If the error is large enough that it could look like tax evasion, do not talk to your accountant first. Accountants can be forced by a judge to testify against you in Canada. Instead, contact a tax lawyer. Conversations with a lawyer are protected by strict solicitor-client privilege, meaning you can be completely honest about how the mistake happened without fear that the lawyer will report you to the CRA.

Step 3: Understand the VDP Limitations

Normally, Canadians who make tax mistakes use the Voluntary Disclosures Program (VDP) to fix their errors penalty-free. However, the CRA rules strictly state that if an audit or enforcement action has already begun for that specific tax year, you are ineligible for the VDP. Your lawyer will confirm if your specific error falls inside or outside the current audit scope. 📝

Step 4: Draft a Formal Disclosure to the Auditor

Instead of hoping the auditor misses it, your lawyer or authorized representative will draft a formal letter. This letter will clearly outline the newly discovered error, provide the corrected calculations, and emphasize that it was an innocent oversight. Providing the information voluntarily before the auditor finds it demonstrates good faith and cooperativeness.

Step 5: Negotiate and Dispute Gross Negligence Penalties

The main goal of self-disclosing is to avoid a penalty under Section 163(2) of the Income Tax Act. This penalty charges you 50% of the understated tax if the CRA believes you were grossly negligent. If the auditor still tries to apply this penalty despite your voluntary disclosure, your lawyer can file a formal Notice of Objection to fight it in the CRA Appeals Division. 💰

How Much Does it Cost in Canada?

Correcting an error during an audit will inevitably cost you money, as you must pay the taxes you rightfully owe. The goal is mitigating the additional financial punishments.

  • The Unpaid Tax: 100% of the correct tax amount you originally missed.
  • Arrears Interest: The CRA charges a prescribed daily interest rate on overdue taxes, which currently hovers between 8% and 10% in Canada.
  • Gross Negligence Penalty: Up to 50% of the unpaid tax amount (this is what you are fighting to avoid).
  • Tax Lawyer Fees: Typically between $3,000 and $10,000+ CAD to manage the auditor relationship and draft formal legal disclosures.
Expense TypeEstimated Cost (CAD)Notes
Overdue TaxesVaries by error sizeMust be paid in full
CRA Interest8% – 10% annuallyCalculated daily from original due date
Legal Representation$3,000 – $10,000+Crucial for avoiding 50% penalties

How Long Does the Process Take?

A standard CRA audit for a small to medium-sized Canadian business usually takes anywhere from 3 to 9 months. However, when you voluntarily bring new, unassessed errors to the auditor’s attention, you should expect the timeline to pause and extend.

The auditor will need time to review your new documents and adjust their working papers. This can easily add 1 to 3 months to your overall audit timeline. If the CRA ultimately issues an unfair penalty and you must file a Notice of Objection, the appeals process can take an additional 12 to 24 months to fully resolve. ⌛

Frequently Asked Questions (FAQ)

Will the auditor expand the audit if I admit to a mistake?

It is certainly possible. If you admit to missing a large source of income in 2024, the auditor might decide to expand their scope to look at 2023 and 2025. This is why having a lawyer strategize your disclosure is vital.

Can I go to jail for a tax mistake?

Generally, no. Innocent mistakes, poor bookkeeping, or simple negligence result in financial penalties and interest. Criminal tax evasion charges are reserved for deliberate, complex schemes designed to defraud the Canadian government.

Can I use the VDP for a different tax year during an audit?

Yes! If the CRA is auditing your 2024 tax year, you are generally still eligible to submit a Voluntary Disclosure for a mistake you made in your 2020 tax year, provided the CRA has not notified you that they are looking into 2020.

Do I really need a lawyer, or can my bookkeeper handle this?

While bookkeepers are great for organizing numbers, they cannot provide legal advice or solicitor-client privilege. If there is a risk of a 50% gross negligence penalty, you should find a skilled tax lawyer in our directory to protect you.

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