If you feel that this will help your return you can definitely make a change by doing the following. You can make changes (amendments) to your current tax return, as
well as a tax return for any of the previous 10 tax years, whether you
filed by mail or electronically using NETFILE. Here’s how you should
proceed to make changes:
Wait until you receive your notice of assessment from the Canada Revenue Agency (CRA).
Once you’ve received your notice of assessment, visit the page how to make changes on the CRA website. http://www.cra-arc.gc.ca/E/pbg/tf/t1-adj/README.html
Follow the instructions on the CRA website. You can change your return online or by mail.
If you choose to amend your return(s) online, the processing time is approximately 2 weeks.
If you choose to amend your return(s) by mail, the processing time is approximately 8 weeks
T1-Adj form : http://www.cra-arc.gc.ca/E/pbg/tf/t1-adj/t1-adj-15e.pdf
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