@me271 It depends - if the cost basis is not reported to the IRS but does appear on your 1099-B form then it will show up on your tax return just fine when you import your 1099-B into TurboTax. That is how you will report it to the IRS.
If the cost basis is not reported to the IRS AND is not reported on your 1099-B then you will have to manually enter the correct cost basis into your tax return just as @RaifH details above.
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