It depends. You can find a reasonable cost basis for the year of purchase, however the real question is whether he received dividends or whether they were reinvested. If the dividends were reinvested, which means more stock was continued to be purchased with the dividends, you would need to research the total amount reinvested.
If dividends were not reinvested, you can rely on the value from any number of internet sites that would provide historical stock prices.
Look at the trend of this particular stock over time to see if it always went up. Do the best you can to arrive at what you believe is a close cost for your father, keep all of your records with the tax return. You can use that as the cost basis to reduce gain on the sale. You always have the option of using zero as the cost basis, but you can use your best efforts as indicated to arrive at a reasonable amount.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
