The taxes are paid on the basis which is the value of the stocks when they vested. In this case, the value of the 39 shares is $4,000 and that is what is used to assess the taxes at vesting. That is the original cost basis, so you need to divide it by the number of shares, 39 in this case, to determine the cost per share. Seventeen of them where sold at time of vesting, at a cost basis of $1,743.58 ($4,000/39 x 17). So you have a basis of $2,256.42 remaining ($4,000 less $1,743.58). If you sell the remaining shares, your basis is $2,256.42 for that sale. @Aims173
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