A realistic 2024–2025 Canadian investor, run through the real tax engine — so you can see what Sched3 catches before you import a single trade.
You sold 100 shares of BCE on Aug 11, 2025 at a loss.
Because you bought 60 shares back on Aug 25, 2025 — inside the 30-day window — the CRA's superficial-loss rule denies $335.94 of that loss.
Sched3 added the denied $335.94 back to the adjusted cost base of the 60 replacement shares, so it isn't lost — it lowers a future gain instead.