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Cannot select "blank" for box 1b on 1099b
Box 1b of this form reports the date you acquired the investment - it is blank on your 1099-B, because the issuer (brokerage/financial institution) did not have that information. This information is only needed to determine if your gain/loss on the sale is "long-term" or "short-term"
If you owned this investment for more than one year before selling it, then enter any date in 2019 or earlier. That will cause the program to report the gain/loss as "long-term".
If you owned this investment for less than one year before selling it, then enter any date in 2020. That will cause the program to report the gain/loss as "short-term".
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