How Do I Change My Tax Return?

If you need to change your tax return, you can do so once you receive your notice of assessment. The best way to do it is through My Account online, but you can also send in a form or write a letter of request to your nearest tax centre.

Why would I need to change a tax return?

The CRA form used to make changes identifies the four most common reasons people request an adjustment:

 
• You received an amended slip
 
• You received a slip late
 
• The CRA's published information was not clear
 
• You did not know you could make the claim you are requesting to apply

You can check a box beside each of the above, and there's also a box for "Other." You can attach an extra sheet for additional explanation.

Which form do I need to request an adjustment?

You can request a change using the T1 Adjustment Request Form. In order to make a change to your tax return, it's important to have supporting documents available.  You will need to provide your social security number and the tax year to which the adjustment applies. An authorized representative can fill out the form on your behalf.  If a representative fills out the T1 form, you should provide a signed letter of authorization. Alternatively, the representative should have Level 2 authorization on the T1013 Authorizing or Cancelling a Representative Form.  Level 2 authorization grants a representative the right to change information such as income, deductions, non-refundable tax credits, and accounting transfers.  You would need to provide the precise line number from the return or schedule for each change requested (the form has space for four):