“Have stock from 1995 and sold this year, the 1099-B does not show the
"basis" at all. “---->The IRS matches the proceeds reported on Form 1099-B to your Schedule D. At the most basic level, the cost basis of an investment is just the total amount invested into the company plus any commissions involved in the purchase. This can either be described in terms of the dollar amount of the investment, or the effective per share price that you paid for the investment. The calculation of cost basis can be complicated. The cost basis of any investment is the original value of an asset adjusted for stock splits, dividends and capital distributions. It is used to calculate the capital gain or loss on an investment for tax purposes. if you are in a situation in which your true cost basis is unclear, I guess you need to consult your financial advisor for professional help.