It's March 15th now, two weeks after your (KathrynG3's) reply, and still the TurboTax program is telling us in the filing instructions to mail Form 8453 after telling us that we wouldn't have to do so after successfully uploading our 1099-B statement. Just when do you plan on correcting this inconsistency, or do we have to take your word here for it, with no accountability associated thereto on your part (since this is just a user forum).
