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Who must file a T1 return

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Not everyone is required to file a T1 return, but far more people should file than are required to. The obligation arises mainly where tax is payable or where CRA has demanded a return, while the reasons to file voluntarily — benefits, credits, RRSP room, tuition carryforward — apply to people with little or no income at all. That gap between "must" and "should" is where an agent adds the most value, because a taxpayer told only that they need not file may lose benefits worth far more than the tax they never owed. This tutorial covers when filing is required, why voluntary filing matters, and what happens when returns go unfiled.

How to work through this tutorial

This separates two questions that sound like one: 1. Establish when a return is legally required. 2. Establish the much larger set of reasons someone should file anyway. 3. Understand the special situations — deceased taxpayers, part-year residents, non-residents. 4. Know what happens when required returns are not filed. 5. Know the routes back for someone with several years outstanding. 6. Check your work against the common errors. 7. Verify every specific against CRA's published guidance before relying on it. The distinction between must and should is the whole point of this topic. An answer that covers only the first is usually the wrong answer in practice.

When a return is required

A return is required in a defined set of circumstances. The central one is that tax is payable for the year. Beyond that, an obligation arises where CRA has served a demand to file — in which case a return is required regardless of whether any tax is owing — and in a range of specific situations set out in the Act. Other common triggers include disposing of capital property in the year, having to repay certain benefits, and participating in particular programs that require a return to reconcile. Confirm the full list rather than working from the general shape, since the specific situations are precisely where an agent's memory fails. Note the asymmetry: owing tax creates an obligation, but being owed a refund does not. Someone who overpaid through withholding has no obligation to file at all — and no way to receive their money unless they do. A demand to file is significant and should be treated as such in conversation. It converts an optional filing into a required one, it exposes the taxpayer to a higher repeat penalty if they have been late before, and it usually means the file has already had attention. Where a taxpayer is unsure whether they had tax payable, the practical answer is nearly always to file. Filing when it was not required carries no penalty; not filing when it was required does.

Why people should file when they need not

This is the part of the topic that matters most in practice, because the population affected is large and the amounts are significant. **Benefits and credits depend on the return.** The Canada child benefit, the GST/HST credit and related provincial and territorial programs are calculated from the return. No return, no calculation, no payment. A person with no income at all still needs to file, every year, to keep receiving them. Where there is a spouse or common-law partner, both generally need to file, because entitlement is based on family income. **RRSP room is created by filing.** Contribution room is built from earned income reported on a return. Someone who does not file does not accumulate the room, and reconstructing it years later is a great deal harder than filing was. **Amounts that carry forward need to be established.** Tuition amounts, capital losses, and other carryforwards are recorded through the return. They cannot be claimed in a later year if the year they arose was never filed. **Refunds are not paid unaddressed.** Overpaid withholding sits with CRA until a return claims it. A taxpayer with no income who asks "do I need to file?" is asking the wrong question. The useful answer explains that they may not be required to, and that not filing will stop their benefits.

Special situations

**Deceased taxpayers.** A final return is filed for the year of death, and its deadline depends on when in the year the death occurred. Optional additional returns may be available in some circumstances, which can reduce the total tax. This is a distinct area with its own guide, and an agent should route rather than improvise. **Part-year residents.** Someone who became or ceased to be a resident during the year files for the period of residency, with certain amounts prorated. The residency topic in Foundations covers how the status is determined; the part-year return itself is covered at level 3 of this line. **Non-residents.** A non-resident files only in respect of certain Canadian-source income, and much Canadian-source income is dealt with by withholding at source instead of by a return. Some non-residents may elect to file in order to be taxed more favourably on certain income types. This is a specialised area. **Children and dependants.** There is no minimum age for filing. A young person with employment income may benefit from filing to build RRSP room even where no tax is payable, and a student with tuition needs to file to establish the carryforward. **Bankruptcy** splits the year and involves a trustee. Route it rather than treating it as an ordinary return.

When required returns are not filed

Failing to file a required return has escalating consequences. The late-filing penalty applies where there is a balance owing, at a percentage of that balance plus a monthly addition, with a higher repeat penalty where the taxpayer has been penalised recently and served with a demand. Interest runs on the balance from the payment deadline. The deadlines topic in Foundations covers both. Beyond penalties, CRA can compel a return, and where one is still not filed it can assess the taxpayer on the information it holds. An assessment raised that way will not include deductions and credits the taxpayer never claimed, so it is generally worse for the taxpayer than the return they would have filed. Benefits stop. This is often the consequence that actually reaches a taxpayer who has been ignoring letters about tax, because it affects money coming in rather than a debt going out. For a taxpayer with several years outstanding, the practical route is to file the outstanding years. Where there is exposure beyond simple lateness, the Voluntary Disclosures Program may be relevant — it exists for taxpayers coming forward about unreported income or incorrect filings, on defined conditions, and it is not a general amnesty. Confirm what it covers before describing it to anyone, and do not present it as a way to avoid tax.

Common errors

Answering "do I have to file?" with only the legal obligation. The consequences of not filing usually matter more than the obligation. Telling someone with no income that they need not file. Benefits depend on the return, every year. Forgetting that where there is a spouse or common-law partner, both generally need to file for family-income-tested benefits to be calculated. Overlooking RRSP room. It is built from reported earned income and is not created by income that was never reported. Overlooking carryforwards. Tuition and losses cannot be claimed later if the year they arose was never filed. Treating a demand to file as informational. It creates an obligation and raises the penalty exposure. Assuming there is a minimum age or a minimum income for filing. Treating a final return for a deceased taxpayer as an ordinary return. The deadline differs and optional returns may be available. Treating a bankruptcy year as an ordinary return. Describing the Voluntary Disclosures Program loosely, or as an amnesty. It has defined conditions and does not eliminate tax.

What to verify this tutorial against

This was drafted without a source document. The list of circumstances requiring a return is specific and should be confirmed rather than recalled. The general income tax and benefit guide for the relevant year sets out who must file and the reasons to file voluntarily, in the form a taxpayer can read themselves. The Income Tax Act sets out the filing obligation and the demand-to-file power. CRA's guide for a deceased person's final return covers the deadlines and the optional returns. CRA's guidance for newcomers, emigrants and non-residents covers the filing position for each, including elective filing for certain non-resident income. CRA's benefit pages confirm that entitlement depends on filing, and on both partners filing where applicable — worth having to hand, since this is the point most worth making to a caller. The Voluntary Disclosures Program has its own published conditions and its own information circular. Read them before describing the program to a taxpayer; the conditions are narrower than the name suggests.

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