Investors & landlords

It's important to enter a cost or other basis for stock that you sold otherwise, you'll be taxed on 100% of the gain.

• You would enter the amount in the cost or other basis box as you're entering your 1099-B form. See Where do I enter a 1099-B? 
• If you imported your mutual fund transactions, to update your cost basis, see How do I update or delete something I imported into TurboTax?