Desjardins Online Brokerage tax reporting, explained

Desjardins Online Brokerage (Disnat) provides tax slips and account statements through AccèsD, with downloadable transaction history and confirmations. For non-registered accounts you’ll generally receive a T5008 covering your dispositions, along with T3 and T5 slips for distributions and dividends. Trades inside a TFSA or RRSP aren’t reported and aren’t taxable.

Like every broker, Desjardins Online Brokerage can only compute cost base from activity it sees in your Desjardins Online Brokerage accounts. If you transferred shares in, hold the same security at another broker, reinvested distributions, or received equity-comp shares, its cost figure can be partial or blank — while the proceeds are usually reliable.

Desjardins is the dominant brokerage in Quebec. T5008 slips and Relevé 18 (RL-18) are both issued — the RL-18 is for Québec provincial filing and may show amounts that differ from the T5008 due to Québec-specific rules. Reconcile against both.

Export your Desjardins Online Brokerage activity (transactions and slips), then build a pooled cost base across all your accounts and brokers — applying reinvested distributions, return of capital, FX on US trades, and any corporate actions. That reconciled ACB, not the raw slip, is what belongs on your Schedule 3.