1. Start with DoorDash's year-end km (if you have it)
DoorDash may show distance on deliveries in the Dasher app or a year-end tax summary. That figure usually reflects on-platform trip km — not every business kilometre (driving to a busy area, between apps, parking, car wash, etc.).
2. Log "gap" business trips separately
Add manual business trips for off-platform driving. Tag them clearly so you don't re-log every delivery DoorDash already counted. Many drivers use weekly batch entries (e.g. "Week of May 12–18 — off-platform errands").
3. Watch for double-counting
Importing DoorDash statement km and logging every DoorDash-tagged business trip can inflate your deductible. Use one source for platform km and manual entries only for the gap.
4. Business-use % drives deductible expenses
Total business km ÷ total vehicle km (often from odometer readings) = business-use percentage. Fuel, insurance, maintenance, and similar costs are typically applied at that percentage on Chart A — keep receipts.
5. Export a worksheet, not a filed return
A good tool gives you a CSV or printable summary you can hand to your accountant or enter into your tax software. It should not claim to "file T2125 for you."