It’s interesting the software doesn’t pick up Capital gains on line 17599 on Schedule 3 from Box 21 - Capital Gains on the T3 slip. I actually had not noticed that, but then again I am including all T3 capital gains in box 52.
With the competitor’s software you don’t enter anything into box 21. Instead you enter your capital gains in box 52 and/or box 53 and box 21 gets populated automatically from those figures.
I use the competitor’s software as a review of the accuracy of all my T1’s. A few years ago I found it got too complicated and time consuming to work them all out by hand in order to check the software prepared returns.