- When the CRA reassesses your return, the law generally treats the assessment as presumptively correct.
- Gross Negligence Penalties A gross negligence penalty is a serious CRA sanction — currently the greater of 50% of the tax understated (or credit overstated) attributable to a false…
- - In an ordinary dispute, focus your energy on building the strongest documentary record you can — the burden is yours to meet.
When people picture a legal dispute, they often assume the government has to prove its case. In most everyday CRA tax disputes, it's actually the other way around: once the CRA issues an assessment or reassessment, the burden of proof CRA appeal process generally puts the responsibility on you, the taxpayer, to show the assessment is wrong. That reversal surprises a lot of people, and it shapes how you should approach an objection or appeal from day one.
The rule isn't absolute, though. In a handful of specific situations, the burden shifts back to the CRA — and knowing which situation you're in changes what evidence actually matters.
This article breaks down who has to prove what, and why the answer differs depending on the type of dispute.
The General Rule: You Prove the Assessment Is Wrong
When the CRA reassesses your return, the law generally treats the assessment as presumptively correct. If you object or appeal, the burden is on you to demonstrate — with evidence, not just argument — that the CRA's numbers are incorrect. This is why documentation matters so much in a tax dispute: receipts, contracts, bank records, and other supporting evidence are what actually move the needle, not simply disagreeing with CRA's conclusion.
When the Burden Shifts to the CRA
| Situation | Who Bears the Burden | Why |
|---|---|---|
| Ordinary reassessment within the normal period | You (the taxpayer) | The assessment is presumed correct; you must show it's wrong |
| Gross negligence penalty | The Minister (CRA) | The Income Tax Act requires CRA to justify imposing this penalty |
| Reassessing a statute-barred year | The Minister (CRA) | CRA must show misrepresentation attributable to neglect, carelessness, wilful default, or fraud — or point to a signed waiver |
Gross Negligence Penalties
A gross negligence penalty is a serious CRA sanction — currently the greater of 50% of the tax understated (or credit overstated) attributable to a false statement or omission, or a minimum amount, under the Income Tax Act (figures as of mid-2026; verify the current amount before relying on it). Because this penalty effectively accuses you of more than an honest mistake, the Act places the burden on the Minister to justify it — CRA has to affirmatively establish the gross negligence, rather than you having to disprove it.
Reopening a Statute-Barred Year
Once the normal reassessment period has passed — generally three years for individuals and Canadian-controlled private corporations, and four years for other corporations and mutual fund trusts, counted from when the original notice of assessment was sent — the CRA can't simply reopen the year at will. To reassess a statute-barred year, the CRA must show misrepresentation attributable to neglect, carelessness, wilful default, or fraud, or point to a waiver you signed. That burden sits with the CRA, not with you.
What This Means Practically
- In an ordinary dispute, focus your energy on building the strongest documentary record you can — the burden is yours to meet.
- If CRA has assessed a gross negligence penalty, don't assume it automatically sticks. Ask whether CRA has actually met its burden of showing the necessary state of mind, rather than simply asserting it.
- If CRA is trying to reopen an old, statute-barred year, scrutinize the basis carefully — CRA needs a specific, provable justification, not just a general suspicion that something was wrong.
Why This Distinction Matters Early
Knowing who carries the burden shapes your strategy from the very first response to CRA, not just at a hearing. If the burden is yours, front-load your objection with the documentation that supports your position rather than waiting to see what CRA does next. If you're in a shifted-burden situation — a gross negligence penalty or a statute-barred year — your objection can focus on testing whether CRA's basis for making that claim actually holds up, rather than assuming you have to disprove everything yourself.
Frequently asked questions
Does the burden of proof ever shift during an objection, or only at Tax Court?
The same general allocation of burden applies whether you're at the objection stage with CRA Appeals or later at the Tax Court of Canada — it doesn't reset or change based on which stage you're at.
If CRA can't prove gross negligence, does that mean I owe no tax at all?
Not necessarily. Failing to prove a gross negligence penalty affects the penalty itself, not necessarily the underlying tax reassessment, which may still stand on its own if you haven't separately disproven it.
What kind of evidence actually helps meet my burden in an ordinary dispute?
Contemporaneous records — receipts, invoices, contracts, bank and credit card statements, mileage logs, and similar documentation — carry far more weight than an after-the-fact explanation with no paper trail behind it.
Can I still dispute a statute-barred reassessment if I signed a waiver?
A signed waiver allows CRA to reassess beyond the normal period for the matters the waiver covers, so its scope and wording matter. Have a tax lawyer review any waiver you're asked to sign, and any reassessment made under one, before you assume it's valid or accept its scope.
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