To adjust your cost basis in a charitable contribution in TurboTax Online:
- If you’re on the Hi TurboTax Client, let's keep working on your taxes! screen, scroll down to Deductions & Credits, click the dropdown, then select Review/Edit. Otherwise, select Click Federal in the left pane, and then select Deductions & Credits in the banner
- Scroll down and click Show more to the right of Charitable Donations
- Click Revisit to the right of Donations to Charity in 2021
- On the Review All Your Charities page, select Edit to the right of the relevant contribution
- As you proceed back through the interview, you’ll have the opportunity to adjust your basis
