To enter a past year's unclaimed charitable donations on TurboTax online EasyStep:
Open your 2021 TurboTax return and click the "Find" icon at the top of the screen.
In the search bar, type Donations and click Go. This will open the Donations Profile for 2021 page.
Check the box for Unclaimed Donation Contributions Carried Forward from a Previous Tax Return.
Select Continue to navigate to the next page.
Once on the Charitable Donations Carried Forward page, enter the unclaimed contributions (contributions you have not yet deducted) that you carried forward from a previous return.