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Reading a notice of assessment

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The notice of assessment is the document taxpayers ask about more than any other. It states what CRA assessed for a tax year, which may differ from what the taxpayer filed, and it starts the clock on the right to object. It also carries information that has nothing to do with the year being assessed — RRSP room for next year, most notably — which is a frequent source of confusion. This tutorial covers what a notice contains, what each part means, what a reassessment is, and the two things a notice does that taxpayers rarely realise: it explains changes CRA made, and it starts a deadline running.

How to work through this tutorial

This walks a notice from top to bottom, then out to what it triggers: 1. Understand what a notice of assessment is and when one is issued. 2. Read the summary — the figures that describe the year assessed. 3. Read the explanation of changes, which is where a surprise is usually explained. 4. Read the account summary — what is owed or refunded, and what that includes. 5. Understand the RRSP information, which is about next year, not this one. 6. Understand what a reassessment is and how it differs. 7. Know what deadline the notice starts. 8. Check your work against the common confusions. 9. Verify every specific against CRA's published guidance before relying on it.

What a notice of assessment is

When CRA processes a return it assesses it and issues a notice of assessment. The notice is CRA's statement of what it has determined for that tax year: the income, the deductions and credits allowed, the tax, and the resulting refund or balance owing. The critical point, and the one most often missed, is that the notice states what **CRA assessed**, not what the taxpayer filed. Usually these are the same. When they are not, the notice is the document telling the taxpayer that something changed. A notice is issued for every assessed return, including returns with no tax payable and returns filed only to establish benefit entitlement. A taxpayer who says they never received one for a year they filed has a real question worth pursuing. Notices are available in CRA's online portal as well as by mail, and a taxpayer signed up for electronic delivery will not receive paper. That accounts for a good proportion of "I never got it" calls. The notice is also the document a taxpayer is most often asked for by third parties — lenders, immigration processes, benefit administrators — which is why requests for copies of old notices are routine.

The summary and the explanation of changes

The summary section walks down the same path the return does: total income, then net income, then taxable income, then the credits applied, then the tax, then the result. A taxpayer holding their return next to their notice can compare line by line, and encouraging them to do that often resolves the call faster than explaining it. Net income deserves particular attention because it does far more work than taxpayers expect. It is the figure benefits are computed from, and the figure several credits are reduced against. Someone puzzled about why a benefit changed is very often looking at a changed net income without realising its significance. Where CRA changed something, the notice carries an explanation. This is the part taxpayers skip and agents should go to first. It will say, in ordinary language, what was adjusted and why — a slip that was reported to CRA but not on the return, a credit claimed without entitlement, an arithmetic correction. If the explanation does not account for the difference the taxpayer is asking about, that is a genuine signal to look further rather than to reassure. And if a taxpayer disagrees with a change, the explanation is what they are actually disputing, so it is the right thing to walk through before discussing an objection.

The account summary, and RRSP information

The account summary states what is owed or refunded. Two things about it regularly confuse taxpayers. First, the balance can include amounts from other years. A refund for the assessed year may be reduced by a debt from an earlier one, or applied against another balance. A taxpayer expecting a refund and receiving less is often looking at an offset rather than an error in the assessment. Second, a balance owing accrues interest from the payment deadline, which may already have passed by the time the notice arrives. The figure on the notice is as at its date. Separately, the notice carries the taxpayer's RRSP deduction limit — and this is about the **following** year, not the year assessed. It is calculated from the assessed year's earned income and reduced by any pension adjustment reported for that year. A taxpayer reading it as a statement about the year they just filed will misunderstand both figures. That is the single most common misreading of a notice, and it is worth pre-empting: the assessment looks backward, the RRSP limit looks forward. A member of a pension plan seeing their room shrink is seeing the pension adjustment working exactly as intended, which the registered plans line covers in full.

Reassessments

If CRA changes an assessment after issuing it, it issues a **notice of reassessment**. The document looks similar and does the same job for the revised figures. A reassessment can arise several ways: the taxpayer requested a change, CRA matched a slip that was not reported, a review or audit concluded, or a carryback from a later year was applied. CRA's ability to reassess is bounded by the normal reassessment period, with exceptions where there was misrepresentation attributable to neglect, carelessness or wilful default, or fraud, or where the taxpayer waived the limit. That period is covered in the topic on the tax year and deadlines. A taxpayer receiving an unexpected reassessment usually wants two things: what changed, and what to do about it. The explanation of changes answers the first. The second is either an adjustment request or an objection, and those are different processes with different purposes — covered at level 3 of the individual tax line. A reassessment starts its own objection deadline for the matters it deals with. A taxpayer who let the original deadline pass is not necessarily out of time on something the reassessment newly raised.

The deadline a notice starts

A notice of assessment starts the clock on the taxpayer's right to object. The deadline for an individual to file a notice of objection is defined relative to both the notice date and the filing due date for the year, and the taxpayer gets whichever is later. Confirm the exact formulation — this is a deadline with real consequences and it is not a single flat period. An agent should treat the date on the notice as significant information rather than a formality. When a taxpayer calls about an assessment they disagree with, establishing the notice date early tells you whether you are having a conversation about an objection or about a late-objection application. Missing the deadline is not always fatal. There is a process for applying for an extension of time to object, itself subject to a limit. But it is an application that can be refused, so the clean path is to object in time. It is worth being clear with a taxpayer that objecting and paying are separate questions. Filing an objection does not by itself stop interest from accruing on an amount ultimately upheld, and the rules on collection during a dispute differ by the type of amount. Do not tell a taxpayer to simply stop paying because they have objected.

Common confusions

Reading the RRSP deduction limit on a notice as applying to the year assessed. It applies to the following year. Assuming the notice reflects what the taxpayer filed. It reflects what CRA assessed, and the explanation of changes is where any difference is set out. Skipping the explanation of changes. It is usually the answer to the question being asked. Treating a smaller-than-expected refund as an assessment error when it is an offset against another balance. Quoting the balance as current. It is as at the notice date and interest may have accrued since. Assuming a taxpayer who never received a notice was never assessed. Electronic delivery accounts for many of these. Overlooking the notice date when a taxpayer disputes an assessment. It determines whether an objection is in time. Treating the objection deadline as a single flat period from the notice. For individuals it is the later of two measures. Telling a taxpayer that filing an objection stops collection or interest. The position depends on the amount and the circumstances. Confusing a request to change a return with an objection. They are different processes with different purposes and different deadlines.

What to verify this tutorial against

This was drafted without a source document. The deadline material in particular should be confirmed precisely, since a wrong answer there can cost a taxpayer their right to dispute. CRA's pages explaining the notice of assessment describe each section of the document and are the right thing to walk a taxpayer through. CRA's guidance on objections sets out the deadline for filing a notice of objection, the extension-of-time application, and what filing an objection does and does not do about collection and interest. The Income Tax Act sets out the objection deadline and the reassessment periods. The general income tax and benefit guide for the year explains the lines that appear in the assessment summary, which is what a taxpayer comparing return to notice is working from. CRA's guidance on the RRSP deduction limit statement explains how the figure on the notice is arrived at, including the effect of a pension adjustment — and the registered plans line in this platform covers the pension adjustment itself. CRA's pages on how refunds may be applied against other debts cover the offset situation.

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