How to update T3 information to an already Submitt...
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How to update T3 information to an already Submitted tax return?

 
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After you file

If you have already filed your tax return, you should wait until you receive your Notice of Assessment (NOA) and make an adjustment. 

https://turbotax.community.intuit.ca/replies/2647992

Often CRA will add a slip if you missed one and they have it in the system, but T3 slips do not have to be issued until the end of March, so it's unlikely they would. 

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