If you used TurboTax Do It Yourself (Online), then you can login to TurboTax Canada TurboTax Do It Yourself (Online) 2025 here: https://ww1.2025.ca.turbotaxonline.intuit.com/

Please make sure you login into the same account that you used when you prepared your returns.

If you used TurboTax Desktop, then the returns are only stored on your computer. Check your Documents folder, or use Windows search to look for .tt25 files.