RE:Last day for tax loss 2024 Found this:
The key thing for investors to remember is that it has deadlines. For investors filing their taxes in Canada, the last day for tax-loss selling in 2024 is December 30. Transactions for stocks purchased or sold after this date will be settled in 2025, so any capital gains or losses will apply to the 2025 tax year.
This year's tax-loss selling deadline for Canadians was previously expected to be December 27, but on May 27, the country switched to a T+1 settlement cycle (one business day following the trade date).
https://investingnews.com/daily/resource-investing/mark-these-tax-loss-selling-dates-on-your-calendar/