If you didn't claim the contribution in the tax year it was made, then you'll need to add it to that return.
This TurboTax Canada FAQ tells you how you can adj...
If you are using TurboTax Do It Yourself (Online), on the 2025 Tax Home page, click on Personal Info, then edit. Then you can click Edit to the right of the lin...
If you are using TurboTax Do It Yourself (Online), you'll need to go through your slips and delete any duplicates. You can click on Income on the 2025 Tax Home ...
If you are using TurboTax Do It Yourself (Online), you can use the search bar on the 2025 Tax Home page to search for Employment Expenses to removetransport emp...