How do i amend a tax return

i missed claiming for GST credit


The long accepted method for revising a personal tax return is to write a letter to the CRA, addressed to the appropriate office (local Tax Services Office representing the taxpayer) providing the details of the requested change.  Attach copies of documents necessary to prove your case.  Refer to the taxpayers' name and SIN so that they can research your request.

If tax return was netfiled, with T4's and T5's and GST there is an option to ammend returns, so I expect there is an option to do so this way as well, but it requires that you have established a secure account/login with CRA.

Now with E-File, I am not sure if you can re-efile or not.
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