Your CRA Notice of Assessment (NOA) is one of the most important documents you'll receive after filing your taxes. It confirms your tax filing details, shows your tax owing or refund, and lists your RRSP contribution room. If you spot an error on your NOA, the good news is that the CRA makes it straightforward to request a correction. This guide walks you through identifying mistakes, understanding what can be corrected, and submitting a correction request. Your NOA is the CRA's official response to your tax return. It arrives by mail (typically within 6-8 weeks of filing) or you can view it in CRA My Account right away. The NOA shows: Your total income and tax paid Tax credits you claimed Your refund amount or balance owing Your RRSP deduction limit for next year Your TFSA contribution room Any adjustments the CRA made to your return While the CRA processes millions of returns, mistakes do happen.
There is no strict deadline to request a correction, but the sooner you catch and report an error, the better. The CRA can assess or reassess your return within six years, so don't delay if you spot something wrong.
Yes, corrections to your income, deductions, or credits will carry forward to future years. For example, correcting your RRSP contribution room now ensures next year's room is calculated correctly.
If the CRA disallows a deduction, a simple adjustment request won't overturn that decision. You would need to file a Notice of Objection within 90 days of your NOA to formally dispute it.
Include any receipts, pay stubs, bank statements, or other proof that supports your correction request. The more documentation you provide, the faster the CRA can process your request.
Sometimes yes, especially for obvious calculation mistakes. However, it's best to contact them directly rather than wait, since they may not catch all errors on their own.