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The tax year, deadlines, and what "assessed" means

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The individual tax year is the calendar year, and everything else in individual tax hangs off a small number of dates that follow it. This tutorial covers when a return is due, when a balance is due — which is not always the same date — what happens when CRA processes a return, how long CRA has to change it afterwards, and what late filing costs. These are the facts an agent quotes most often and the ones taxpayers most often have wrong, usually in the direction that costs them money.

How to work through this tutorial

This follows a tax year from its end to the point CRA can no longer reopen it: 1. Establish what a tax year is for an individual. 2. Learn the filing deadline, and the separate deadline for paying. 3. Learn the different filing deadline for the self-employed, and the trap inside it. 4. Understand what happens when CRA assesses a return. 5. Learn how long CRA has to reassess, and when that window does not close. 6. Understand what late filing and late payment cost. 7. Know where relief exists, and where it does not. 8. Check your work against the common errors. 9. Verify every specific against CRA's published guidance before relying on it.

The tax year, and the two deadlines

For an individual, the tax year is the calendar year. It ends on 31 December and the return covering it is filed the following spring. There are two deadlines and they are not the same thing. The **filing** deadline is when the return must be filed. The **payment** deadline is when any balance owing must be paid. For most individuals these fall on the same date, which is why people assume they are one deadline — but they separate for the self-employed, and the separation is where the money is lost. Where a deadline falls on a Saturday, a Sunday, or a public holiday recognised by CRA, a return or payment received on the next business day is treated as on time. Confirm the specifics, since this rule does not apply identically to everything CRA administers. A taxpayer expecting a refund faces no penalty for filing late, because penalties are calculated on a balance owing. That does not make late filing harmless: benefits depend on the return being filed, so a late return delays or interrupts benefit payments regardless of whether tax was owing. That last point is the one worth volunteering. A taxpayer who says "I'm getting a refund so it doesn't matter" is right about the penalty and wrong about the consequence.

The self-employed deadline and its trap

An individual who carried on a business in the year — and their spouse or common-law partner — gets a later filing deadline. The extra weeks exist because business records take longer to assemble than a T4. The trap is that the **payment** deadline does not move with it. A balance owing is still due on the ordinary date, even though the return itself is not due until later. So a self-employed taxpayer who files on their later deadline, with a balance owing, has been accruing interest since the earlier date despite having filed perfectly on time. This catches people every year, and it catches them in a way that feels unfair, because they did exactly what they understood the rule to be. An agent who explains both dates up front prevents the complaint entirely. Note also that the extended deadline applies to the spouse or common-law partner as well. That is a genuine convenience — a couple with one self-employed member files together on the later date — and it is also a common source of confusion when only one of them has business income. Where someone is uncertain whether their activity is a business at all, that determination comes first and is covered in the self-employment topic.

Assessment and reassessment

When CRA processes a return it issues a notice of assessment. That notice states what CRA has assessed, which may differ from what the taxpayer reported. Reading one is its own topic in this line. After assessing, CRA can go back and change the assessment. The period during which it may normally do so runs from the date of the original notice of assessment, and for most individuals it is a fixed number of years. Confirm the length — it differs by taxpayer type, and quoting the wrong one to a taxpayer worried about an old year is a meaningful error. The normal reassessment period is not absolute. It can be extended where the taxpayer has made a misrepresentation attributable to neglect, carelessness or wilful default, or committed fraud — in which case there is no time limit at all. It can also be extended where the taxpayer has signed a waiver, which taxpayers sometimes do to keep a year open while a related matter is resolved. The direction matters as much as the length. The reassessment period limits **CRA**. A taxpayer wanting to change their own return works under a different rule with a different and generally longer window, covered in the topic on adjusting a filed return. An agent should be careful not to tell a taxpayer that a year is "closed" without knowing which direction the question is about.

What late filing and late payment cost

Filing late with a balance owing attracts a late-filing penalty: a percentage of the balance owing, plus a further percentage for each complete month the return is late, up to a maximum number of months. The rates and the cap should be confirmed rather than quoted from memory. A taxpayer who has already been charged the late-filing penalty in one of the preceding years and has been formally demanded to file faces a higher repeat penalty, at roughly double the rates and over a longer maximum period. The escalation exists because the first penalty evidently did not work. Separately from penalties, interest accrues on an unpaid balance. Interest is charged at a prescribed rate that is set quarterly and compounds daily, and it runs from the payment deadline regardless of when the return was filed. Never quote a prescribed rate from memory; it changes every quarter and CRA publishes it. Penalties and interest are distinct, and a taxpayer usually asks about them as one thing. Separating them is the first step in giving a useful answer, because relief for each is considered on its own terms. There are further penalties for repeated failure to report income and for false statements or omissions. These are more serious and are not a matter of running a few weeks late.

A worked example: two deadlines, one taxpayer

Teaching example. The figures below are invented to show the method. They are not CRA figures, and no amount here should be used for a real taxpayer.

Priya runs a small consulting business. She has business income for the year and expects to owe tax on it. Suppose, for this example only, that the filing deadline for most individuals is 30 April, that the deadline for the self-employed is 15 June, and that the payment deadline for everyone is 30 April. Confirm the real dates in CRA's guidance — the point here is the shape, not the dates. Priya files her return on 10 June. As a self-employed individual she is comfortably within her filing deadline, so **no late-filing penalty applies**. Her return is on time. But she pays her balance of, say, $4,000 on the same day. The payment deadline was 30 April, so that balance has been outstanding since then. **Interest has been accruing for about six weeks**, even though she did nothing wrong on the filing side. Her spouse Marc has only employment income, and no business of his own. He nonetheless gets the same later filing deadline, because Priya is self-employed. If Marc had a balance owing, his payment deadline would also have been 30 April. The lesson to carry into a call: "filed on time" and "paid on time" are separate questions, and a self-employed taxpayer can be one without being the other. The figures above are invented; the interest a real taxpayer owes depends on the prescribed rate for the relevant quarters.

Where relief exists

The Act contains taxpayer relief provisions allowing CRA to cancel or waive penalties and interest in defined circumstances — broadly, situations beyond the taxpayer's control, CRA delay or error, and financial hardship. Three things about it are worth an agent knowing precisely. It is discretionary, so a taxpayer who meets the description is not automatically granted relief. It is limited in how far back it reaches, so old years may be out of reach regardless of merit. And it applies to penalties and interest — not to the tax itself, which relief cannot reduce. That last point is the one taxpayers most often misunderstand. Someone asking for their tax to be forgiven because of hardship is asking for something the provision does not do; relief may reduce what accrued on top of the tax, but the tax remains. Relief is requested through a defined process with a prescribed form, not granted by an agent on a call. Setting expectations honestly at that point — that it is discretionary, that it takes time, that it does not touch the tax — is kinder than implying it is routine. Separately, a taxpayer who cannot pay in full may be able to arrange a payment schedule. That is a collections matter rather than relief, and the two are commonly conflated by callers who simply cannot pay.

Common errors

Treating the filing deadline and the payment deadline as one date. For the self-employed they are not, and interest accrues from the earlier one. Forgetting that a self-employed person's spouse or common-law partner shares the later filing deadline. Telling a taxpayer expecting a refund that filing late is harmless. There is no penalty, but benefits depend on the return. Quoting the prescribed interest rate from memory. It is set quarterly and published. Quoting penalty rates from memory. Confirm the percentages and the maximum number of months. Saying a year is "closed" without establishing which direction the question runs. The normal reassessment period limits CRA; a taxpayer's own adjustment request works under a different rule. Forgetting that the reassessment period does not close at all where there was misrepresentation attributable to neglect, carelessness or wilful default, or fraud. Describing taxpayer relief as though it reduces tax. It applies to penalties and interest. Implying relief is routine. It is discretionary and time-limited. Conflating a payment arrangement with relief. One is collections, the other is a request under the relief provisions.

What to verify this tutorial against

This was drafted without a source document. The dates, rates and periods here are exactly the material an agent quotes most often, so confirm every one of them. CRA's pages on filing and payment due dates for individuals give the current-year dates, including how weekends and holidays are handled and the separate self-employed deadline. CRA's guidance on penalties and interest sets out the late-filing penalty rates, the repeat-failure penalty, and how prescribed interest is applied. The prescribed rate itself is published quarterly and must be taken from the current table. The Income Tax Act sets out the normal reassessment period, the circumstances in which it is extended, and the waiver mechanism. CRA's taxpayer relief pages cover what relief can and cannot do, the limitation on how far back a request may reach, and the prescribed form. The general income tax and benefit guide for the year in question is the single best reference for the filing obligations and dates as they applied to that year — which matters, because a question about an old year is answered by that year's rules. CRA's payment arrangement guidance covers what to tell a taxpayer who cannot pay in full, which is a different path from relief.

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