The CRA will make changes to your tax return based on the information sent with your return and the information they have on file.
If you have new or additional information you want to send the CRA to change your return, see How to change your return.
If you disagree with your assessment or reassessment, and want to register a formal dispute, see Complaints and disputes. You have 90 days from the date of the notice of assessment to register your dispute.
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