Missed 90-Day Deadline to File a CRA Notice of Objection?

If you missed the 90-day window to object to a CRA assessment, the most important thing to know is that your objection rights are not automatically lost. A late-filed objection may still be accepted, but only if you apply for an extension within one year after the original deadline and meet specific conditions. Acting quickly—before that one-year mark passes—gives you the best chance to restore your right to dispute the tax.

Below we explain what to do when you’ve missed the 90-day deadline to file a CRA Notice of Objection and what your options are in BC. The rules are technical, but understanding the available remedies will help you make a confident decision.

Missed the 90-Day Deadline to File a CRA Notice of Objection? What Are Your Options in BC?

Under the Income Tax Act and the Excise Tax Act, a Notice of Objection must generally be filed within 90 days from the date the CRA sends a Notice of Assessment or Reassessment. If that window closes, you may still restore your objection rights through a formal extension application. The application must be made within one year after the original 90-day deadline—and the sooner you act, the stronger your position will be.

Your Options After Missing the Deadline

Missing the deadline does not mean you have no recourse. There are three main routes to consider, depending on your situation and what you are trying to fix.

Applying for an Extension of Time to File a Notice of Objection

This is the primary remedy. You can apply to the CRA for an extension to file a late Notice of Objection. To succeed, you generally need to show that you had a bona fide intention to object before the deadline, that you were prevented by circumstances beyond your control, and that you applied as soon as circumstances permitted. You must also demonstrate that it would be just and equitable to grant the extension—which usually means your underlying tax dispute has enough merit to be worth hearing.

Taxpayer Relief for Penalties and Interest

If your underlying tax amount cannot be disputed, you may still request relief from penalties and interest under the taxpayer relief provisions. This can be granted for reasons such as illness, natural disaster, or CRA error. Taxpayer relief does not change the tax assessed, but it can reduce the financial burden of late penalties and accumulated interest. You generally have 10 years to request this relief.

Correcting Returns Through Adjustments (When Applicable)

If the reassessment resulted from a mistake in your own filing—such as an omitted expense or a data entry error—you may be able to correct the return through a T1 adjustment or an amended GST/HST return. This is not a substitute for an objection when the CRA has made a substantive assessment against you, but for simple errors it can be an efficient fix.

Detailed Guidance for Extension Applications

We prepare extension applications regularly, and the difference between success and denial often comes down to how well you document your reasons and the underlying merit of your case.

Eligibility Criteria for a Late Objection Extension

The CRA will consider both why you missed the deadline and whether you acted as soon as you could. Valid reasons often include:

Serious illness or hospitalization that prevented you from dealing with tax matters.
Bereavement or a family crisis during the objection period.
Postal delivery issues or a missed change of address that meant you never received the Notice of Assessment.
Incorrect or misleading information provided by the CRA.
Mental health conditions that impaired your ability to manage finances.

Simply forgetting or being too busy is rarely accepted. The key is to show that the delay was genuinely outside your control and that you took action promptly once the obstacle was removed.

Building a Strong Late Objection Application

A convincing application should include the following:

A detailed written explanation of exactly when and how you discovered the missed deadline.
Documentation that supports your reason—medical certificates, hospital records, courier tracking, or notes of calls to the CRA.
Evidence that your original tax assessment is wrong or at least reasonably disputable, such as receipts, bank statements, contracts, and accounting records.
Proof that you moved quickly to file the extension after the circumstances changed.

Do not rely on emotional appeals alone. The CRA looks for evidence and a coherent timeline.

Common Mistakes to Avoid When Filing Late

We often see applications fail because of avoidable errors:

Waiting until the last minute—remember that you only have one year from the original deadline.
Filing a new tax return instead of a Notice of Objection.
Relying on verbal advice from a CRA agent without putting it in writing.
Submitting a vague explanation without supporting documents.
Assuming the CRA will approve your application simply because you have a sympathetic story.

If Your Extension Is Denied

If the CRA refuses your extension application, you are not necessarily at the end of the road. You can ask the Tax Court of Canada to review the decision.

Appealing to the Tax Court of Canada if the CRA Denies Your Extension

For income tax matters, you must apply to the Tax Court within 90 days of the CRA’s refusal. For GST/HST matters under the Excise Tax Act, the window is shorter—only 30 days. You can also apply if the CRA has not responded to your extension request within 90 days of filing it. The court will weigh the same factors as the CRA and may grant the extension even if the CRA did not.

Key Court Decisions on Late Objections

Several cases highlight what judges expect. In Bozzer v. Canada, the Federal Court of Appeal emphasized that legislative time limits are strict and cannot be extended lightly. In LeBlanc v. Canada, a taxpayer succeeded because of strong evidence and a credible explanation for the delay. In Tomlinson v. Canada, the court denied an extension where the taxpayer could not show valid reasons. These decisions show that your evidence, your honesty, and your timeliness are decisive.

Important Deadlines and Timelines

To keep track of what is still possible, note these critical time limits:

90 days from the Notice of Assessment or Reassessment to file a Notice of Objection.
1 year after the original 90-day deadline to apply to the CRA for an extension of time to object.
90 days (income tax) or 30 days (GST/HST) after a CRA refusal to apply to the Tax Court for a review of the extension decision.
10 years to request taxpayer relief for penalties and interest.

Missing the first one-year extension window almost always means you lose the right to dispute the underlying tax.

When You Cannot Restore Your Objection Rights

There are situations where no extension is possible. You lose the ability to object if:

More than one year and 90 days have passed since the original assessment date.
You cannot provide any evidence of circumstances beyond your control.
You deliberately ignored CRA correspondence.
The reassessment is clearly correct, so there is no genuine dispute.

In these cases, your only remaining option is usually taxpayer relief for penalties and interest—not a challenge to the tax itself.

Consequences of Not Taking Action

If you do nothing, the CRA will treat the assessment as final. That can lead to serious financial and legal consequences, including:

The full tax balance becoming immediately collectible.
Daily compounding interest on the outstanding amount.
Wage garnishment or freezing of bank accounts.
Registration of liens against property.
Personal liability for directors of corporations in certain cases.

Once the objection deadline passes without action, you are also barred from appealing to the Tax Court on the merits of the tax.

Take Action Now: Conclusion and Next Steps

If you have missed the 90-day deadline, the next thing to do is gather your paperwork, note the exact date of the Notice of Assessment, and write down the reasons for your delay. Then file an extension application without waiting for the one-year limit to approach. The earlier you act, the better your chances of restoring your right to object.

If you need help preparing a late objection application, we are here to review your situation and guide you through the process.

Once your objection rights are in place, small businesses should follow the steps to dispute a CRA reassessment so the right form is filed on time and the appeal stays on track.