I've got a draft of our partnership's f1065 filing. The partners' K-1s all have a superfluous "E" code in line 20. (It has no amount.)
Looking it up in the IRS's Partner's Instructions, that code is for "Basis of energy property." I have no idea what I may have done to suggest to TurboTax that it was relevant.
How do I get rid of it?
