I would assume that it depends upon whether you sold them for more than you bought them. If you did, then I would think that you would need to pay income tax on the profit.
You will get the tax form in the mail from DVC. i forget the form no., i just turned mine in to our tax preparer. i sold 3 in one year and didn't think it made much of a difference.
Generally the answer is No. There are circumstances where a small portion of the dues can reduce your profit. You'll have to talk to your accountant when the need arises.