Yes, you must determine and you can enter the cost basis yourself if it is not on the Form 1099-B or if the cost basis on that form is not correct.
At the most basic level, the cost basis of an asset or security is the total amount invested in it, plus any purchase or sale commissions involved. This can either be described in terms of the dollar amount of the investment, or the effective per share price paid for the investment. The cost basis of any investment is the original cost of shares adjusted for stock splits, dividends, and capital distributions.
This will be used to calculate the capital gain or loss on an investment after it's been sold, for tax purposes.
Gather all of your information from your records or the records of the stock broker if you have maintained the stock with the same broker from purchase to sale. Otherwise you will be required to track your cost basis of the stock shares.
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