Reassessment

Tax

A reassessment is a change the CRA makes to a tax return it has already assessed, typically after a review or audit, adjusting your tax within the reassessment period.

Once the CRA has assessed a return, it can still change it by issuing a reassessment, usually after a review, audit or matching program finds a discrepancy. The normal reassessment period is three years from the original assessment for individuals and CCPCs, and four years for other corporations.

That time limit disappears where there was misrepresentation from neglect, carelessness, wilful default or fraud, allowing the CRA to reassess any year, however old. Unreported foreign income and unfiled returns carry their own extended windows. If you disagree with a reassessment, the response is a Notice of Objection within 90 days.

Example

Two years after assessing your return, the CRA matches a T5 slip you forgot to report and issues a reassessment adding the investment income plus interest. Because it is within the three-year window, the CRA can make the change.

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Normally three years for individuals and CCPCs, four for other corporations. There is no limit where misrepresentation from neglect, carelessness or fraud is involved.
Yes, by filing a Notice of Objection within 90 days, which sends the matter to the independent Appeals Division for review.
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What Canadians Search About Reassessment

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A tax return is the annual filing that reports your income, deductions and credits to the CRA so the final tax for the year can be settled. Payers withhold tax during the year and the return reconciles that against what you actually owe, producing either a refund or a balance to pay. For 2025 returns filed in 2026, refunds usually arrive in about two weeks for an online return, while a paper return runs on a considerably longer standard because it is handled manually.

Yes, the CRA does telephone people, usually about a balance owing, a missing return, an audit or to verify information, and calls can come from many different numbers, so caller ID proves nothing either way. A real agent never demands payment by gift card, cryptocurrency or e-transfer, never threatens immediate arrest or deportation, and never asks for a password. If a call feels wrong, hang up, check your balance and mail in My Account, then call back using a number from canada.ca.

Filing is required once tax is owed, and also in several situations regardless of income, including selling property, repaying benefits, splitting pension income, or receiving a request to file from the CRA. Below the basic personal amount most people owe nothing, yet filing still pays: the Canada Child Benefit, the GST/HST credit and provincial credits are all calculated from a filed return. Check the basic personal amount for the year you are filing.

Start with deductions that lower taxable income: RRSP contributions, childcare, eligible moving expenses, employment expenses your employer certifies, and interest on money borrowed to invest. Then claim credits, including tuition, medical expenses, donations and pension income splitting. Rental owners deduct mortgage interest, property tax, insurance, utilities and repairs on the rented portion, while improvements are capitalised and depreciated instead. Income splitting with family members runs into attribution rules, so get the structure checked first.

Udit Gupta, founder of Tax Filings Canada

Reviewed and fact-checked by Udit Gupta

Ex Big 4 — Ernst & Young, Deloitte · International & cross-border tax specialist · CPA Canada (In-Depth Tax Program) · Chartered accountant, ICAI & MIA

Udit Gupta has over 15 years of experience helping corporations and business owners with corporate structuring, corporate tax filing, bookkeeping, payroll, GST/HST, cross-border tax and CRA representation. Big 4 trained at Ernst & Young and Deloitte, and qualified as a chartered accountant in India and again in Malaysia, he founded his accounting practice in 2014 to serve entrepreneurs, startups and non-resident business owners across Canada. View full member bio.

The Institute of Chartered Accountants of India — member 521458 · Malaysian Institute of Accountants — member CA 44667 · Ex Big 4: Ernst & Young, Deloitte · CPA Canada (In-Depth Tax Program), completed 19 Dec 2023 · In-Depth GST/HST Part I, 12 Jul 2022 · Part II, 5 Jul 2023

Editorial policy. Every page is researched against primary sources — the Income Tax Act, CRA publications and CPA Canada guidance — and every rate or threshold is stated with the tax year it applies to.

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