Solved: I received a 1099B and a supplemental stock plan lot detail which cost basis should I use? The one on the 1099B or the adjusted cost basis on the supplemental form?

I received a 1099B and a supplemental stock plan lot detail which cost basis should I use? The one on the 1099B or the adjusted cost basis on the supplemental form?

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Even though stock basis may be included on Form 1099-B, you may revise that basis with a more accurate number. This may come from supplemental information or from your own records.

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Even though stock basis may be included on Form 1099-B, you may revise that basis with a more accurate number. This may come from supplemental information or from your own records.

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**Mark the post that answers your question by clicking on "Mark as Best Answer"