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Tax Deadline April 30: The Most Common CRA Mistakes Canadians Make — and How to Avoid Them

Missed deductions, wrong SINs, unreported side income — these are the errors that delay your refund, trigger CRA letters, and quietly cost Canadians millions every year. Here's your 2026 checklist With April 30 just days away, millions of Canadians are racing to pull together slips, receipts, and records before the Canada Revenue Agency's personal income tax deadline. But filing on time and filing  correctly  are two very different things. The CRA flags thousands of returns each year for errors that are entirely preventable — errors that delay refunds, generate costly reassessments, and sometimes result in penalties that linger for months. Whether you're a first-time filer, a seasoned DIY-er, or someone handing everything to an accountant, here are the 10 most common CRA mistakes Canadians make — and exactly how to avoid each one. 1. Misunderstanding the April 30 deadline The filing deadline for most Canadians is  April 30, 2026 . Miss it when you owe money, and you'll ...

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The alternative minimum tax


 

The alternative minimum tax (AMT) is a secondary way for Canadians to calculate their income tax. It is often applicable when you have claimed a preferential tax deduction or credit, such as capital gains, dividend, or employee stock options.

Each year, your tax owing is calculated under the normal method, which considers the preferential tax credits and deductions. This number is then compared to a second calculation where you don’t receive these same credits and deductions, but your tax is calculated at a lower tax rate. For most instances, the normal calculation will result in more tax owing. When the second calculation results in a higher amount owing, you will pay this higher amount. The difference between the regular tax owing and the second calculation is the AMT. When you are subject to the AMT, this should be viewed as a prepayment of future tax. Over the next seven years, you can recover this amount paid against your regular income tax. In order to recover this AMT in the future, you would have to be taxable in future years, thus if you do not have taxable income in these years, this AMT will be lost.

I hope this helps!

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