Mistakes on a tax return are more common than most people think. Whether you forgot to report income, missed claiming a credit, or entered incorrect details, the good news is that you can fix it after filing.
The Canada Revenue Agency allows taxpayers to request changes once they’ve received their Notice of Assessment. Acting promptly ensures your records stay accurate and helps you avoid penalties or missed benefits.
When You Can Request a Tax Return Change
Before making any updates, you must wait until your Notice of Assessment (NOA) is issued. This confirms that your original return has been processed and is ready for modification.
Step-by-Step: How to Change Your Tax Return Online
The fastest and most efficient way to correct your return is through your CRA online account:
- Sign in to your CRA account via CRA My Account
- Navigate to the “Change my return” option
- Select the tax year you want to update
- Enter the corrected or additional information and submit your request
Once submitted, the CRA will review your changes and send you a Notice of Reassessment outlining any updates.
Other Ways to Make Changes
If you prefer not to use the online system, you still have alternatives:
- Use certified tax software that supports adjustments
- Submit a request by mail using the appropriate forms
Each method has different processing times, with online requests generally being the fastest.
What to Check Before Submitting a Change
To avoid delays or errors, review the following before starting your request:
- Confirm that your Notice of Assessment has been issued
- Verify the tax year you’re updating
- Gather any supporting documents for the correction
- Check estimated processing timelines
Taking a few minutes to prepare can significantly speed up your request.
Processing Time and What to Expect
Processing times vary depending on how you submit your request and the complexity of the change. Online submissions are typically processed faster, while mailed requests may take longer.
After your request is reviewed, you’ll receive a Notice of Reassessment showing any changes to your tax balance, refund, or credits.
Why It’s Important to Correct Your Tax Return
Updating your return ensures:
- You receive all the credits and benefits you’re entitled to
- Your reported income is accurate
- You avoid potential penalties or interest charges
Even small corrections can have a meaningful impact on your financial situation.
Get Started
You can sign in or register for your CRA account and submit your changes directly here:
https://www.canada.ca/en/services/taxes/income-tax/personal-income-tax/after-you-file/change-return.html
Keeping your tax information accurate is essential, and the CRA provides straightforward tools to help you fix mistakes quickly and securely.
