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Missed the 90-Day Tax Court Appeal Deadline in Canada?

Missed the 90-day deadline to appeal to the Tax Court of Canada? Learn how an extension under ITA s. 167 works, the four conditions and the one-year limit.

Tax4 min readTSLBy the Treadstone Law Team · CanadaUpdated November 13, 2026
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Key takeaways
  • You generally have 90 days from the date on the notice confirming or reassessing to appeal to the Tax Court of Canada.
  • If you miss it, you can apply to the Tax Court for an extension, but only within one year after the 90-day period expires.
  • You must prove four things, including that the application was made as soon as circumstances permitted and that there are reasonable grounds for the appeal.

You objected to a CRA assessment, the CRA answered, and the 90-day window to go to the Tax Court of Canada has now passed. That is stressful, but it may not be the end of the road.

The Income Tax Act allows you to ask the Court for more time. The rules are strict, and the steps differ from those for a late notice of objection, so it helps to know which stage you are at.

This article is general information, not legal advice.

This article covers Canadian federal tax law, which applies in every province.

How the 90 days are counted

After you serve a notice of objection, you may appeal to the Tax Court of Canada once the Minister has confirmed the assessment or reassessed. The deadline is 90 days from the day the notice was sent to you saying the Minister confirmed the assessment or reassessed.

The CRA says the Court must receive your notice of appeal within 90 days of the date on that notice. Mailing it near the end of the period is therefore risky. The CRA lists the ways to file as delivery, mail, fax or the Court's electronic filing.

Do you actually need an extension?

Not always. If the Minister has not notified you of a decision, you may appeal once 90 days have passed after service of your notice of objection, and you do not have to wait for CRA Appeals to decide. For GST/HST objections, the CRA states the wait is 180 days.

A different timing rule applies to ecological gifts, where the appeal must be made within 90 days after the Minister of the Environment issues the certificate. Also, you cannot appeal an issue on which you waived in writing the right to object or appeal.

Applying to the Tax Court for more time

If you missed the deadline, you may apply to the Tax Court for an order extending the time to appeal, and the Court may impose terms it considers just. The application sets out the reasons for the delay.

No extension order can be made if the application comes after that one-year period. Treat it as a firm limit.

The four things you must show

To obtain an extension, you must satisfy each of these conditions.

ConditionIn plain words
Inability or intentionWithin the 90 days you were unable to act or instruct someone to act, or you had a bona fide (genuine) intention to appeal.
Just and equitableIt is just and equitable to grant the application.
Prompt applicationYou applied as soon as circumstances permitted.
Reasonable groundsThere are reasonable grounds for the appeal.

Whether your reasons meet these tests depends on your facts, so a lawyer or accountant can help you judge them.

Late objection versus late appeal, and next steps

A late notice of objection is handled differently. You first apply to the Minister (Chief of Appeals) under s. 166.1, within one year after the objection deadline. You must show inability to act or a bona fide intention to object, that it is just and equitable, and that you applied as soon as circumstances permitted.

Frequently asked questions

How long do I have to ask for an extension?

The application must be made within one year after the 90-day appeal period expires, and no order can be made otherwise. The CRA describes this as one year and 90 days from the confirmation or reassessment.

Will the Court automatically grant more time?

No. You must show the four conditions, including that you applied as soon as circumstances permitted and that there are reasonable grounds for the appeal. The Court may also impose terms it considers just.

What do I file with the application?

The application sets out the reasons for the delay and is filed with three copies of the application and three copies of the notice of appeal.

I am still waiting for a decision on my objection. Am I late?

Possibly not. If the Minister has not notified you of a decision, you may appeal once 90 days have elapsed after service of your notice of objection.

Sources

Links go to official government, court and regulator pages. The law changes — confirm you are reading the current version.

This article is general information, not legal advice. Reading it does not create a lawyer-client relationship. Canadian laws, tax rates, and government programs change, and how the law applies depends on your specific facts. For advice about your situation, speak with a tax lawyer or accountant. Reach us at 1-844-900-1070 or send our Team a message.

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