I have a broker provided tax summary form (from 2017 as I am working on an amended return). For a long-term asset that was sold, one of the categories included for inclusion within Form 8949 is that Box E is checked and the cost basis was not "officially" reported to the IRS, but the form does include a cost basis for those assets although it was not included within box 1e (cost or other basis). So, I have 2 questions. 1) If there is a known cost basis for these long term assets why would the brokerage not have reported the cost basis? 2) Since a cost basis was included on the summary from the broker, but not reported for whatever reason, can I add that cost basis to that sale? Thank you.
