I had the same question so I wanted to post to this for next person since Gabriel's answers are not helpful. The reasonable question is: why are there two returns printed out and lots of forms that we are then told for some reason not to submit? Unfortunately uFile does not explain why this is happening and asks us to take it on faith that we can throw the rest of those papers in the garbage. Taxes are too important to risk making a mistake. So there you have it. That big square bar code on page one of the condensed return has much of the info CRA needs. If you have a schedule 4 or schedule 5 in your package you'll most likely see it has CRA printed the upper right and must therefore be included but for other schedules you won't. If you look at your T1-KFS you'll see other schedules and forms summarized.