Tax Court of Canada: A Practical Guide for Self-Represented Taxpayers

If the CRA denied your notice of objection and issued a Notice of Confirmation, the Tax Court of Canada is the next step. About 44% of taxpayers at the Tax Court are self-represented, meaning they appear without a lawyer. Of those self-represented taxpayers, roughly 14% succeed. The success rate for represented taxpayers is significantly higher (around 45-50%). The gap is not because self-represented cases are weaker; it is because self-represented taxpayers often do not understand the procedure, the burden of proof, or what evidence the court needs. This page covers the practical mechanics: what to file, which procedure to choose, what happens at the hearing, and how to give yourself the best chance of winning without a lawyer.

When can I go to Tax Court?

You can file a Notice of Appeal with the Tax Court after the CRA has issued a Notice of Confirmation (denying your objection in full) or a Notice of Reassessment following the objection (partially changing the assessment). You can also file if the CRA has not responded to your objection within 90 days (section 169(1)), though in practice the CRA’s processing times mean this is uncommon within the first year.

The deadline is 90 days from the date the Notice of Confirmation is sent. This is a hard deadline. If you miss it, section 167 allows you to apply to the Tax Court for an extension, but only within one year of the expiry of the 90-day period. After that, the assessment is final.

You do not need to pay the disputed tax before filing. Section 225.1 suspends CRA collection action on the disputed amounts until 90 days after the Tax Court’s judgment.

Which procedure: informal or general?

The Tax Court offers two procedures, and choosing the right one matters.

Informal Procedure (section 18 of the Tax Court of Canada Act): Available when the amount of federal tax in dispute is $25,000 or less per year, or the amount of a loss determination is $50,000 or less. The filing fee is $100. The rules are relaxed: the court is “not bound by any legal or technical rules of evidence,” and the judge may conduct the hearing in whatever manner the judge considers appropriate. No lawyer is required. The hearing is typically shorter (half a day to one day). The judgment is final and not subject to appeal (except on questions of jurisdiction or denial of natural justice).

General Procedure (section 17): Applies to amounts above the informal thresholds or when the taxpayer elects the general procedure. The filing fee is $250. Standard court rules apply: formal pleadings, examinations for discovery, document production, and a full trial. Either side can appeal the judgment to the Federal Court of Appeal. Representation by a lawyer is not required but strongly recommended.

For most self-represented taxpayers with disputes under $25,000, the informal procedure is the right choice. It is faster, cheaper, and explicitly designed to be accessible to non-lawyers. The tradeoff: you cannot appeal the decision (with narrow exceptions), so the informal procedure is a one-shot hearing.

How do I file the Notice of Appeal?

The Tax Court provides Form 21 for informal procedure appeals. The form asks for:

1. Your name, address, and SIN.
2. The taxation year(s) in dispute.
3. The date of the Notice of Confirmation (or Reassessment).
4. The amount in dispute.
5. The reasons for the appeal (a brief statement of why you believe the CRA’s assessment is wrong).
6. The relief you are requesting (what you want the court to order).

The “reasons for the appeal” section does not need to be a legal brief. In the informal procedure, a clear statement in plain language is sufficient: “The CRA disallowed my foreign tax credit of $6,200 for US taxes paid. I paid these taxes and have receipts. The credit is available under section 126(1) of the Income Tax Act and Article XXIV of the Canada-US treaty.” The statement should identify the specific items in dispute and the legal basis for your position, but it does not need to cite case law.

File the Notice of Appeal by mail or online through the Tax Court’s website. Pay the filing fee ($100 for informal). The court will serve the appeal on the CRA (the Attorney General of Canada), and the CRA will file a reply. The reply tells you the CRA’s legal position and the facts it relies on, which helps you prepare for the hearing.

What is the burden of proof?

In most tax appeals, the taxpayer bears the burden of proof: you must demonstrate, on a balance of probabilities (more likely than not), that the CRA’s assessment is wrong. The CRA does not need to prove it is right; you need to prove it is wrong. This is the single most important thing self-represented taxpayers need to understand, because it determines what you need to bring to court.

The exception is penalties: the CRA bears the burden of establishing the facts that justify a gross negligence penalty (section 163(3)). If the penalty is in dispute, the CRA must prove you were grossly negligent, not just that the return was wrong.

There is also a partial exception for assumptions: the CRA’s reply will state the assumptions of fact on which it relied when making the assessment. If you can demolish the CRA’s assumptions (by showing they are factually wrong), the burden effectively shifts. But if you cannot, the court will assume the CRA’s facts are correct unless you prove otherwise.

For cross-border filers, the burden of proof means you need to bring the US return, proof of US tax payment, the treaty article, and any other foreign documentation that supports your position. The court will not take your word for it. If you claim you paid $8,000 in US tax, bring the cancelled cheque, the IRS account transcript, or the 1040 showing the amount paid.

What happens at the hearing?

The informal procedure hearing is relatively informal. The judge sits at the front, you sit at a table on one side, the CRA’s counsel sits at the other. There is no jury. The hearing typically proceeds as follows:

1. Opening statements. Each side briefly summarizes the dispute and the position. Keep yours short: what the CRA changed, why you disagree, and what evidence you will present.
2. Your case. You present your evidence first (because you bear the burden). This means testifying about the facts and introducing documents. The judge will ask you questions. The CRA’s lawyer will cross-examine you. Bring originals of all documents and three copies (one for you, one for the judge, one for the CRA).
3. The CRA’s case. The CRA may call its own witnesses (the auditor, an assessor), or it may rely on cross-examination and the documents already in evidence. You can cross-examine the CRA’s witnesses.
4. Closing arguments. Each side summarizes why the court should rule in their favour.
5. Judgment. The judge may render a decision from the bench (immediately) or reserve judgment and issue a written decision later. Written decisions typically arrive within a few weeks to a few months.

The informal procedure is designed so that non-lawyers can navigate it. The judge will often guide self-represented taxpayers through the process, explain procedural steps, and ask clarifying questions. The judge is not your advocate, but the court recognizes that self-represented litigants need some procedural assistance.

What are the common mistakes?

Not bringing documents. The single biggest reason self-represented taxpayers lose. Testimony alone (“I paid the tax”) is not enough. Bring receipts, statements, cancelled cheques, foreign tax returns, and any other documentary evidence that proves your claim.

Not understanding the burden. Many self-represented taxpayers expect the CRA to prove they are right. The CRA does not have to prove anything (except penalties). You have to prove the assessment is wrong. If you cannot, you lose even if the CRA’s case is weak.

Arguing fairness instead of law. The Tax Court applies the law. “The penalty is unfair” or “the CRA took too long” are not legal arguments the court can act on. The court can only determine whether the assessment is correct under the Income Tax Act. Fairness arguments belong in a taxpayer relief application, not at Tax Court.

Not reading the CRA’s reply. The CRA’s reply to your Notice of Appeal tells you exactly what the CRA will argue and what facts it relies on. If you do not read and address the reply, you will be surprised at the hearing.

Conceding strong issues while fighting weak ones. Some taxpayers have one strong issue and three weak ones. They spend the hearing arguing all four equally, diluting the strong argument. Focus on the issues where you have the best evidence and the clearest legal basis.

Can I go to Tax Court from outside Canada?

Yes. The Tax Court sits in major cities across Canada and can accommodate remote participation. If you are a non-resident or a cross-border filer living in the US, the court can arrange a hearing by teleconference or videoconference in appropriate cases. Contact the court registry to make arrangements.

There is no requirement that you be a Canadian resident to file a Tax Court appeal. If the CRA reassessed your Canadian return (which it can do whether you live in Canada or not), you have the right to appeal the reassessment to the Tax Court regardless of where you live.

What should I do next?

Check the date on the Notice of Confirmation. Count 90 days. If you are within that window, file the Notice of Appeal (Form 21 for informal procedure) with the $100 filing fee. Write a clear statement of the reasons for your appeal, identifying the specific items in dispute and the legal basis. Gather all supporting documents and organize them before the hearing. Read the CRA’s reply when it arrives and prepare to address the CRA’s specific arguments.

If you are outside the 90-day window but within one year, apply to the court for an extension under section 167. If more than one year has passed, the right to appeal has expired.

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.