gytt
Level 2

What does box E on 1099-B mean Exactly

Hello Experts!

I received a 1099-B form from my broker. One transaction indicates "E (basis not reported to IRS)", but it DOES show the cost under column "Cost basis".  My understanding is that the same copy of 1099-B is sent to both IRS and me, so the cost base is actually reported IRS. I am confused. Could you please advise? Thanks in advance.