Every spring, after you file your income tax return, the Canada Revenue Agency (CRA) sends back an official document that most Canadians glance at briefly before filing away in a drawer. That document — the Notice of Assessment — deserves far more attention than it typically gets. Whether you are owed a refund or you owe a balance, understanding your NOA can protect you from costly mistakes, missed deadlines, and lost contribution room.
A Notice of Assessment (NOA) is CRA's official summary of how they have assessed your personal income tax return for the year. Think of it as CRA's response to the T1 return you submitted — it confirms how much tax you owe, how much refund you are entitled to, and flags any adjustments CRA made to the figures you reported.
One important point that confuses many Canadians: receiving a NOA is not the same as being audited, and it does not mean your return is final. Under the Income Tax Act, CRA has the legal right to reassess your return within three years of the original NOA date for most individuals — and up to four years for more complex situations, such as transactions involving related parties or where misrepresentation is alleged. Receiving your NOA simply means CRA has processed your return as filed, with any noted changes.
Timing depends on how you filed:
Every Canadian who files a return receives a NOA. If you use CRA My Account, the NOA appears there immediately after processing — before the paper copy arrives by mail. Registering for My Account and enabling email notifications means you will know the moment your NOA is ready.
The NOA can look deceptively simple, but each section carries specific information you need to review carefully.
This is the main block of figures and the section most people focus on. It shows:
This section is critically important and often overlooked. Your NOA shows your RRSP deduction limit available for the following tax year. This figure includes:
A common source of confusion: the RRSP room shown on your 2024 NOA is what you can contribute and deduct in 2025 — not 2024. Many people over-contribute because they misread which year the room applies to, which can trigger a penalty tax of 1% per month on the excess.
If you withdrew funds from your RRSP under the Home Buyers' Plan (HBP) or the Lifelong Learning Plan (LLP), your NOA tracks your outstanding repayment balance. Missing annual repayments causes those amounts to be included in your income for that year — a tax consequence worth avoiding.
If CRA changed any figure from what you reported, they will note it on the NOA with the specific line number affected and the relevant section of the Income Tax Act. Common adjustments include disallowed medical expenses, corrected employment income, or recalculated credits. Do not skip this section — it is where errors on either side (yours or CRA's) will surface.
If you have a balance owing, CRA charges compound daily interest starting May 1 (for T1 filers with an April 30 deadline). The prescribed interest rate is set quarterly and is currently elevated compared to the low-rate era of the early 2020s. Paying any balance owing promptly limits interest accumulation.
Once you receive your NOA, set aside a few minutes to compare it against your filed return. Specifically, verify:
Errors are more common than most people expect — both taxpayer errors and CRA processing errors occur. The key is catching them within the relevant time windows before your options narrow.
If something does not look right, you have three escalating options depending on the nature and severity of the issue.
If the error is straightforward — you forgot to claim a medical expense, omitted a charitable donation slip, or CRA missed a deduction you clearly supported — the simplest route is filing a T1-ADJ form. This requests CRA to adjust your return without escalating to a formal dispute. You can submit a T1-ADJ through CRA My Account, through a tax professional, or by mailing the paper form. Generally, you can request adjustments for up to ten prior tax years.
If CRA has applied a position you disagree with — disallowing a deduction based on their interpretation of the law, for example — you will need to file a formal Notice of Objection. This is a more serious step and has strict deadlines you cannot afford to miss:
A Notice of Objection can be filed using Form T400A or electronically through CRA My Account. Once filed, your objection goes to CRA's Appeals Division, which is a separate branch that independently reviews the original assessment. CRA is obligated to reconsider the file, and many objections are resolved at this stage — either in the taxpayer's favour or through a settlement.
If the Appeals Division confirms the original assessment and you still disagree, the next step is the Tax Court of Canada. You have 90 days from the date of the Appeals Division's final decision (called a Notice of Confirmation) to file. The Tax Court has two procedures — the Informal Procedure (for amounts under $25,000) and the General Procedure (for larger disputes, which typically requires legal representation). Tax Court is a formal legal process and should not be undertaken without professional guidance.
At Swift Accounting Calgary, we regularly assist clients in reviewing NOAs, preparing T1-ADJ requests, and navigating the objection process — particularly in situations where CRA has disallowed business expenses or investment losses.
A few practical points every Canadian taxpayer should know:
If you are unsure whether an adjustment on your NOA is worth disputing, or if you need help reading a complex NOA from a year with multiple income sources or business income, Swift Accounting in Calgary offers a straightforward review service. Getting a second set of professional eyes on a disputed assessment costs far less than leaving a wrongful adjustment unaddressed for years.
NETFILE filers typically receive their NOA within two weeks of filing. Paper filers should expect to wait eight weeks or more. If you have registered for CRA My Account, you can view your NOA online as soon as CRA finishes processing your return — often before the paper copy arrives in the mail.
Start by comparing the NOA line by line against your filed return. CRA will note any adjustments they made with the specific line number affected. If you believe CRA made an error, you can file a T1-ADJ for simple corrections or a Notice of Objection if you disagree with CRA's legal position. Act promptly — the 90-day objection deadline runs from the date on your NOA.
No. A Notice of Assessment is CRA's standard processing confirmation for every tax return filed in Canada — not an audit. CRA processes your return and issues the NOA based largely on what you reported. An audit is a separate, targeted review where CRA requests documentation to verify specific items. Receiving a NOA without any adjustment notes generally means CRA accepted your return as filed, though they retain the right to reassess within three years.
CRA recommends keeping tax records for at least six years. This covers CRA's standard three-year reassessment window plus a reasonable buffer for extended situations. Your NOA is also important for tracking RRSP deduction room, HBP and LLP balances, and net capital losses carried forward — figures that can affect multiple future years of returns. Store NOAs alongside your supporting tax documents in a secure location, whether physical or digital.
Your Notice of Assessment is more than a receipt for filing your taxes — it is an active financial document that affects your RRSP room, your repayment obligations, and your legal rights to dispute CRA's position. Taking ten minutes to read it properly each year can prevent expensive errors from compounding over time. If you have questions about your NOA or need help responding to a CRA adjustment, contact us to speak with our team.
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