If you haven't filed your return as of yet then you won't need to file an adjustment you can simply go into your return and fix your error or if you filed and you did not claim any work from home benefits then there is nothing for you to do.
If you did file then you will file as an adjustment. The CRA requires that you wait until you’ve received your Notice of Assessment (NOA) before filing an adjustment. In many cases, the CRA will catch the mismatch and automatically adjust your return for you.
Further information is available on the following link: I've filed my tax return. Can I still make changes?
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