CRA Objection & Tax Court Appeal

Overview

Receiving a CRA Notice of Reassessment can feel like a final verdict — but it is not. Canada’s tax system provides every taxpayer with a formal, multi-stage dispute process that is entirely separate from the auditors who issued the reassessment. The CRA’s Appeals Division operates independently from audit functions, and its mandate is specifically to provide an impartial review.

Most Canadians either pay reassessments they shouldn’t owe, or miss their objection deadline entirely. Understanding this process can recover thousands — or even tens of thousands — of dollars in wrongly assessed tax.

The Two Critical Deadlines

Getting the deadline right is the single most important step. Miss it, and you may lose your right to object permanently.

Deadline 1: The 90-Day Rule (Primary Deadline)

For most taxpayers, a Notice of Objection must be filed within 90 days of the date printed on the Notice of Assessment or Reassessment (the mailing date, not the date you received it).

Exception for individuals and graduated rate estates: The deadline is the later of:

90 days after the date of the assessment/reassessment, or
One year after your filing due date for that tax year (typically April 30 of the following year)

This means an individual who receives a reassessment in January 2026 for their 2024 return technically has until April 30, 2026 (one year after the 2024 filing deadline) — not just 90 days from January. This is a significant extension that most people don’t know about.

Deadline 2: The 1-Year Extension (If You Missed the 90-Day Window)

If you miss the primary deadline, you can apply to the Minister of National Revenue for an extension of time to file an objection. You must apply within one year after the expiry of the 90-day period. The CRA may grant this if you can show:

Within the 90-day period, you were genuinely unable to act or give a mandate to act
You had a bona fide intention to object
It would be just and equitable to grant the extension
The application was made as soon as circumstances permitted

If the CRA refuses the extension application, you can bring a further application to the Tax Court of Canada.

Key authority: Income Tax Act, RSC 1985, c. 1 (5th Supp.), sections 165 and 166.1 (extension of time to object) and section 166.2 (application to Tax Court).

Stage 1: Filing the Notice of Objection

What It Is

A Notice of Objection is a formal written document served on the Minister of National Revenue that triggers a mandatory review of your assessment by the CRA Appeals Division. It is not just a letter — it has specific legal requirements.

How to File

You can file an objection in three ways:

Online (fastest): Through CRA’s My Account → “File an objection” — available 24/7 and generates a confirmation number.
Using Form T400A: Download the Notice of Objection — Income Tax Act form from Canada.ca, complete it, and mail or courier it to the Chief of Appeals at your tax services office.
Written letter: A signed letter containing all required information (see below) addressed to the Chief of Appeals.

What Your Objection Must Contain

Under section 165(1) of the Income Tax Act, the notice must include:

The reasons for the objection — explain clearly why you believe the assessment is wrong
All relevant facts — include dates, amounts, and specific items being disputed
The specific items in dispute (line numbers and amounts from your return or reassessment)

A vague “I disagree” is insufficient. Courts have confirmed that an objection must put the Minister on notice of the specific issues being contested (Aallcann Wood Suppliers Inc. v. Canada, 1994 TCC).

Where to Send It

Mail or courier to the Chief of Appeals at your designated CRA Tax Services Office. The address is listed on the back of your Notice of Assessment or at canada.ca/cra-contact.

Important: Do not send it to the auditor or the general CRA address. Send it specifically to Appeals.

What Happens Next

The CRA must acknowledge receipt and assign an Appeals Officer
The Appeals Officer reviews your file de novo (fresh start) — they are not bound by the auditor’s conclusions
Processing times currently range from 6 to 36 months depending on complexity and the CRA’s backlog
During the objection period, the CRA generally cannot pursue collection action** on the disputed amount (though interest continues to accrue on any confirmed liability)

Tip: File the objection on time even if your documentation isn’t complete. You can supplement with additional information after filing.

Stage 2: The CRA Appeals Division Review

Separation from Audit

This is the most important structural fact most Canadians don’t know: the Appeals Division is organizationally separate from the audit function. Appeals Officers report to a different chain of command and are specifically trained to be impartial adjudicators — not CRA advocates.

In practice, Appeals Officers:

Review all documents, including any new evidence you provide
Can and do overturn auditors’ conclusions
Are more receptive to legal arguments, case law, and technical tax policy arguments than frontline auditors
Will often call you (or your representative) for an informal conference to discuss the issues

What You Can Provide

At the objection stage, you can submit:

New documents not previously provided to the auditor
Written legal arguments (including case law from the Tax Court and Federal Court)
Third-party expert opinions or appraisals
Additional receipts, invoices, or business records

Outcomes

The Appeals Division can:

Allow the objection — cancel or reduce the reassessment
Vary the assessment — partially reduce the amount
Confirm the assessment — uphold the auditor’s position
Reassess — issue a new assessment (can sometimes result in a higher amount, so be cautious)

When CRA confirms or varies the assessment, they issue a Notice of Confirmation or a Notice of Reassessment — this triggers your right to appeal to the Tax Court.

Stage 3: Tax Court of Canada Appeal

When to Use It

After the CRA confirms your assessment (or after 90 days have elapsed from your Notice of Objection without a response from CRA), you can appeal to the Tax Court of Canada. You have 90 days from the date CRA sends its decision to file your appeal.

Two Procedures: Choose Carefully

Informal Procedure (For Disputes Under $25,000)

Threshold: The total federal tax and penalties in dispute must be $25,000 or less (per year under appeal), or the loss being carried back/forward is $50,000 or less
Filing fee: None
Lawyers: Not required — you can represent yourself
Rules: Simplified — the Tax Court of Canada Rules (Informal Procedure), SOR/90-688b
Judgment: Binding, but cannot be cited as precedent
Costs: The Court may award costs to the taxpayer if they are successful; costs awards against taxpayers are rare in the informal procedure
Timeline: Typically 6–18 months from filing to hearing

This is the most underutilised tool in Canadian tax law. A taxpayer with a $15,000 dispute can appear before a federally appointed judge, make legal arguments, and receive a binding judgment — all without a lawyer and without a filing fee.

General Procedure (For Disputes Over $25,000)

No monetary threshold
Formal rules of court apply (similar to civil litigation)
Filing fee required
Lawyers strongly recommended
Judgments can be cited as precedent
Full costs awards are possible

How to File with the Tax Court

Complete the Notice of Appeal form available at tcc-cci.ca
File it with the Tax Court Registry (by mail, courier, or in person) within 90 days of the CRA’s decision
Serve a copy on the Department of Justice (as representative of the Crown)
The Court will schedule a hearing date

At the Hearing

In the informal procedure, hearings are relatively informal. The judge will:

Hear your evidence (sworn testimony and documents)
Hear the Crown’s position
Ask questions
Issue a judgment (sometimes at the hearing, often weeks later in writing)

You do not need to be a lawyer to present effectively. Judges in the informal procedure are accustomed to self-represented taxpayers and will generally explain the process.

What Most People Don’t Know

The CRA’s interest can be partially waived — separately from an objection, you can apply for taxpayer relief under section 220(3.1) of the Income Tax Act to cancel or waive interest and penalties if your situation was caused by financial hardship, illness, or CRA errors or delays.
Collections are generally suspended while a valid objection is pending for amounts assessed as tax (though not for source deductions or GST/HST).
You can object and request a payment arrangement simultaneously — paying under protest does not waive your objection rights.
The CRA loses a meaningful number of Tax Court cases — taxpayers who pursue the informal procedure with well-documented cases and clear legal arguments have real prospects of success. The CRA’s internal 2012 evaluation found that taxpayer-provided new information changed outcomes in a significant proportion of cases.
Represent a Client portal: If you want a tax professional to help with your objection without formally engaging a law firm, they can represent you through CRA’s online “Represent a Client” service.

Practical Tips for Self-Represented Taxpayers

Document everything: Keep a log of every communication with the CRA — dates, names of officers, reference numbers.
Request your file: Use an Access to Information request or ask the Appeals Officer for a copy of your CRA file, including the auditor’s working papers.
Cite specific law: Reference the specific section of the Income Tax Act or Income Tax Regulations that you believe supports your position. The CRA and Tax Court respond to statutory arguments more than general fairness arguments.
Look up similar Tax Court cases: CanLII (canlii.org) is free and contains all Tax Court decisions. Search for cases with similar facts to yours.
Consider the Taxpayer’s Ombudsperson: If you believe the CRA has treated you unfairly (separate from the correctness of the assessment), the Taxpayer’s Ombudsperson (canada.ca/en/taxpayers-ombudsperson) can investigate service complaints.

Legal Basis

Provision	What It Does
Income Tax Act, s. 165	Right to file a Notice of Objection; 90-day deadline
Income Tax Act, s. 165(1)(a)	Extended deadline for individuals (later of 90 days or 1 year after filing due date)
Income Tax Act, s. 166.1	Application to Minister for extension of time to object
Income Tax Act, s. 166.2	Application to Tax Court for extension of time
Income Tax Act, s. 169	Right to appeal to Tax Court after objection
Income Tax Act, s. 220(3.1)	Taxpayer relief — waiver of interest and penalties
Tax Court of Canada Act, RSC 1985, c. T-2	Establishes the Tax Court and its jurisdiction
Tax Court of Canada Rules (Informal Procedure), SOR/90-688b	Rules for the simplified informal procedure

Frequently Asked Questions

Do I have to pay the reassessed tax while my objection is being reviewed?

The CRA generally cannot pursue collection action on the disputed amount while a valid Notice of Objection is pending. However, interest continues to accrue on any amount that is ultimately confirmed as owing. Some taxpayers choose to pay under protest to stop interest from running — paying does not waive your right to object or seek a refund if the objection succeeds.

What is the exact deadline to file a Notice of Objection, and what if I missed it?

For individuals and graduated rate estates, the deadline is the later of 90 days after the Notice of Assessment/Reassessment, or one year after your tax filing due date for that year (usually April 30). If you’ve missed the 90-day window, you can apply to the Minister of National Revenue for an extension of time — you have up to one year after the 90-day deadline expired to do so. If the CRA refuses, you can apply to the Tax Court of Canada for the extension.

Is the CRA Appeals Officer the same person who audited my return?

No — this is the most important structural protection in the process. The Appeals Division is organizationally separate from audit functions. Your Appeals Officer is a different person with a fresh mandate to review your file impartially. They are not bound by the auditor’s conclusions and can and do reverse them when presented with new evidence or legal arguments.

How do I take my dispute to Tax Court without a lawyer?

For disputes of $25,000 or less in federal tax and penalties (per year), use the Informal Procedure: file a Notice of Appeal at tcc-cci.ca, there is no filing fee, no lawyer is required, and hearings are designed for self-represented taxpayers. Download the Notice of Appeal form from the Tax Court’s website, file it within 90 days of the CRA’s decision, and serve a copy on the Department of Justice.

Can I submit new documents and evidence that I didn’t give the auditor?

Yes — and this is one of the most valuable features of the objection process. At the Appeals stage you can submit any new documents, receipts, expert opinions, or legal arguments that were not previously provided. The Appeals Officer reviews these fresh. Many objections succeed specifically because the taxpayer provides stronger documentation at this stage than they had during the audit.