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@nexchap.  it looks like @Allencar didn't reply to this post but i have something similar.  my K1 shows in the sales schedule for 4/3/20 a purchase of 9206 with cumulative adjustment to basis of -10921 giving a cost basis of -1715.  all short term. the 1099-B shows a sale proceeds of 63.97 and cost basis of 9,205.95 (I think they shut down this fund which is unfortunate as a few more months would have turned this around, but i digress).  Anyway, the adjustment to basis is more than the investment and TT won't take a negative basis in the 1099-B.  Is it really as simple as leaving the 1099-B alone and using the line 7 adjustment suggested by allencar?  would i enter the -10921 there.  I don't know how many other people are out there with this issue so if you aren't able/interested in answering i understand.  thanks for considering