The Notice of Assessment is the CRA's first formal result after a return is processed, showing the assessed outcome and key carryforwards.
A Notice of Assessment is the CRA document that summarizes the result after a filed return is assessed.
This document is often the taxpayer’s first official confirmation of how the CRA processed the return. It can confirm a refund, show a balance owing, and highlight important carryforward or room information.
After a T1 return is filed and processed, the CRA issues a Notice of Assessment showing the outcome of that assessment. It is not the return itself. It is the CRA’s response to what was filed and processed.
The Notice of Assessment can matter for more than the immediate tax result. It may also show information that influences future planning or later filings, which is why many taxpayers keep it with their permanent tax records.
CRA guidance on NOAs and NORs highlights a few sections that taxpayers commonly use:
| Notice section | What it helps you confirm |
|---|---|
| Notice details | Tax year, issue date, and identity details tied to the assessment |
| Account summary | Whether the result is a refund, balance owing, or nil balance |
| Tax assessment summary | The line-number amounts CRA used to calculate the result |
| Explanation of changes | Why CRA changed something, if the assessed result does not match the filed return |
| NETFILE access code | The code often used for a later year’s electronic filing workflow |
That structure is one reason the NOA matters beyond a refund check. It becomes the taxpayer’s working reference for what CRA actually processed, not just what the taxpayer originally sent.
The NOA is important, but it is not a promise that the file will never be checked again. CRA review guidance says returns may still be reviewed later even after an NOA is issued, which is why the notice and the supporting records both matter.
| First checks after an NOA arrives | What you are trying to confirm |
|---|---|
| Tax year and issue date | You are looking at the correct notice for the correct filing year |
| Refund, amount due, or nil balance | The high-level result matches your expectation |
| Explanation of changes | CRA did or did not alter what you filed |
| Key carryforward or room items | Future-year RRSP, TFSA, or related planning details were not overlooked |
A taxpayer files a T1 return and later receives a Notice of Assessment showing that the return was processed with a small balance owing and updated deduction-room information. That notice becomes the reference point for the filed year unless the CRA later reassesses it.
A Notice of Assessment is not the same thing as filing a return.
It is also not automatically a warning letter or penalty notice. In many cases, it is simply the standard post-filing assessment summary.
It is also not the same as a Notice of Reassessment. CRA issues a reassessment notice only when an already assessed return is later changed.
Is a Notice of Assessment the document you file with the CRA? Answer: No. It is the CRA’s response after the filed return has been assessed.
Why should taxpayers keep their Notice of Assessment? Answer: Because it summarizes the CRA’s processed result and can contain information that matters for future tax years.
The exact contents and notices included can vary by filing situation and year, so a taxpayer should read the current document carefully rather than assuming it always carries the same information.