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  • How to Fix an Incorrect Tax Return: Steps to Amend Your Filing
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  • SMALL BUSINESS BUILDER

    • How to Fix an Incorrect Tax Return: Steps to Amend Your Filing

    You just hit “submit” on your tax return, feeling a wave of relief that it’s finally done. But a few days later, you’re cleaning off your desk and find a T5 slip buried under a pile of mail. Or maybe you realize you completely forgot to claim your child’s daycare expenses.

    Your heart sinks. You’ve already filed. Is it too late? Are you going to be penalized?

    Take a breath. Making a mistake on your tax return is incredibly common, and the Canada Revenue Agency (CRA) has a straightforward process for fixing it. At Padgett Business Services, we help clients correct their tax filings all the time. This guide will walk you through exactly how to fix an incorrect tax return without the stress.

    Rule #1: Wait for Your Notice of Assessment

    The most important rule of fixing a tax return is this: Do not file a second tax return for the same year.

    If you realize you made a mistake right after filing, your first instinct might be to just fix the error in your software and hit submit again. Don’t do this. The CRA’s system will reject the second return, and it will only cause confusion.

    Instead, you must wait until the CRA has processed your original return and issued your Notice of Assessment (NOA). Once you have your NOA in hand, you can officially request a change.

    How to Request an Adjustment

    Once you have your NOA, you have three ways to request an adjustment to your tax return:

    1. Online via CRA My Account (The Fastest Method)

    This is the quickest and easiest way to amend your return.

    • Log in to your CRA My Account.
    • Click on “Change my return.”
    • Select the tax year you want to adjust.
    • Enter the line number you need to change (e.g., Line 12000 for dividend income, or Line 21400 for childcare expenses) and input the correct figure.
    • The system will automatically recalculate your return.

    2. Online via ReFILE (Using Your Tax Software)

    If you used certified tax software to file your original return, you might be able to use the CRA’s ReFILE service.

    • Open your original tax return in your software.
    • Make the necessary corrections.
    • Use the ReFILE feature to transmit the adjusted return directly to the CRA.

    3. By Mail (The Slowest Method)

    If you prefer paper, or if you are adjusting a return from several years ago, you can file by mail.

    • Fill out a T1-ADJ, T1 Adjustment Request form.
    • Clearly state the line numbers you are changing, the previous amounts, and the new amounts.
    • Mail the form, along with all supporting documents (like the missing T-slip or receipts), to your designated tax centre.

    What Happens After You Request a Change?

    Once the CRA receives your adjustment request, they will review it.

    If you requested the change online, it usually takes about two weeks to process. If you mailed a paper form, it can take eight weeks or longer.

    After the review, the CRA will send you a Notice of Reassessment. This document will show the changes made and outline your new tax situation.

    • If the change resulted in a larger refund, they will send you the money.
    • If the change means you owe more taxes, the Notice of Reassessment will state the balance due, including any applicable interest.

    Important Considerations When Amending a Return

    Time Limits

    You can’t go back and change a tax return from 20 years ago. Generally, you can only request an adjustment for a tax year ending in any of the 10 previous calendar years. For example, in 2025, you can request an adjustment for any tax year back to 2015.

    Keep Your Documentation

    If you use CRA My Account or ReFILE to make a change, you don’t need to submit your receipts or slips immediately. However, the CRA may select your adjustment for a review and ask to see the proof later. Always keep your supporting documents for at least six years.

    The Voluntary Disclosures Program (VDP)

    If your mistake was significant—for example, you failed to report a large amount of income for several years—and you owe a substantial amount of money, simply filing a T1-ADJ might result in heavy penalties. In these cases, you should consider applying through the Voluntary Disclosures Program (VDP) before the CRA contacts you. The VDP can offer relief from penalties and prosecution.

    Frequently Asked Questions

    Q: Will amending my return trigger an audit?

    A: Not necessarily. Simple adjustments, like adding a missed T-slip or claiming a forgotten RRSP contribution, are processed routinely. However, if you frequently amend your returns or make large, unusual adjustments, it could increase your risk profile with the CRA.

    Q: I forgot to claim a deduction, but it’s only worth $50. Is it worth amending?

    A: That’s up to you. The process is free, but you have to decide if the time spent is worth the small refund.

    Q: Can I carry back a loss to a previous year using a T1-ADJ?

    A: No. If you want to carry back a capital loss or non-capital loss to a previous year, you must use a specific form (Form T1A, Request for Loss Carryback), not a standard adjustment request.

    Get It Right the Second Time

    Fixing a tax mistake is possible, but it’s always better to get it right the first time. If your tax situation has become too complex to handle on your own, or if you need help fixing a past mistake, we are here for you.

    At Padgett Business Services, our tax professionals can review your past returns, identify missed opportunities, and file the necessary adjustments on your behalf. We ensure everything is done correctly so you don’t have to worry about a second mistake.

     

    Don’t let a tax error keep you up at night. Contact us today and let us help you set the record straight.

    The post How to Fix an Incorrect Tax Return: Steps to Amend Your Filing appeared first on Padgett Business Services | Canada.

    06/17/2026



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