Enter a "Date Acquired" that results in the appropriate holding period - short term or long term.
If you know the date you acquired the security, you can enter it yourself, using the MM/DD/YYYY format.
If don't know the date, but know that you had held it for more than a year (long-term), you can enter a date that is more than one year before the sale date.
If don't know the date, but know that you had held it for a year or less (short-term), you can enter 01/01/2017 as the date acquired.
If the 1099-B does not report your cost, provide the "Cost or other basis" (Box 1e) from your records.
