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How do I find a stock's cost basis?

SOLVEDby TurboTax649Updated December 22, 2021

If you know when the stock was purchased, here are some tips:

  • Sign in to your brokerage account
    • Although your broker may not include your basis on your 1099-B, it doesn't necessarily mean they don't have it.
    • If your current broker was the selling agent, there's usually a wealth of documentation available in your online brokerage account that can help, such as detailed reports on each sale.
  • Look at previous broker statements
    • Review your records for the trade confirmation when you bought the shares. (It's always a good idea to save these for tax purposes.)
    • If you purchased the stock at different times or haven't sold all the shares at once, you may have more than one trade confirmation statement.
  • Contact your brokerage firm
    • Your broker should have a record of the purchase, if you bought the stock from them.
    • If not, they might still be able and willing to look up the historical stock price for you.
  • Go online for historical stock prices
    • For example, the historical section at Marketwatch or Nasdaq. It's generally acceptable to take the lowest and highest price from a given day and average them to arrive at a cost. It's also acceptable to use the closing price on the day of purchase.
    • These free services may not include events that affect basis, such as reinvested dividends, spin-offs, and stock splits.
  • Go directly to the source
    • Many companies have an investor relations section on their website which contains historical stock data. You can also call the company's shareholder services department for help.
    • For shares purchased more than 10 years ago, go to a public library or law school library and look for back issues of newspapers, such as USA Today, to find the high and low price on the date of purchase.

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