Get your taxes done using TurboTax

ThomasM125 · ‎February 22, 2024

If you determine that the cost basis reported on the Forms 1099-B are incorrect, you can adjust the cost basis reported on your tax return. You will see an option for this when you enter the Form 1099-B information in TurboTax. On the screen where you enter the sales proceeds and cost basis, just check on the box that says The cost basis is incorrect or missing on my 1099-B:

So, you enter the cost basis reported on your Form 1099-B then on another screen you'll see an option to enter the correct cost basis:

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