My 1099-b has "Transactions for which basis is not reported to the IRS and term is unkown.

[evaneb]

Keep these for your records, but you should not this for your 2020 taxes.

[aerotechbd]

Thanks . 

[fanfare]

"Transactions for which basis is not reported to the IRS and term is unkown"

All closing transactions must be reported to the IRS,

including those mentioned above.

You must supply the acquired dates and cost basis from your own records.