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I’m going to start by trying to ask a general question, and then I’ll give details on why I’m am asking:   Q: If all transactions in the 1099-B “Proceeds from Broker” section do not have a reported cost basis and instead turbotax uses the transactions from the 1099-B "Supplemental Stock Plan Lot Detail" section, does the “Proceeds from Broker” section serve the filer any purpose and does TurboTax even store that information (I can’t find it).   After having done a first pass over my taxes, but before I filed, my broker issued a correction to my 1099-B. The errors fixed related to RSU transactions. There are about 27 of them, and the changes amounted to essentially removing 4 of the transactions and replacing with 4 others. This is in the “Proceeds from Broker and Barter Exchange Transactions” section of the 1099-B. This impacted the total shares sold and the proceeds total. There were no changes to the “Supplemental Stock Plan Lot Detail” used to adjust the cost basis of the shares (adjusted because 1099-B shows them with a $0 cost basis). What I noticed now is that the "Proceeds from Broker" section and the supplemental section are now agreeing  with each other w.r.t. total shares sold and total proceeds, which is good. Previously they did not. I’m surprised TurboTax didn’t flag this error.   I’m trying to figure out how to update my return with these corrections. I really don’t want to remove the downloaded 1099-B and re-download it, mostly because dealing with the supplemental transactions is probably where I’ve already spent half my time with this tax return. Not something I want to repeat. I noticed that currently the 8849 and schedule D seem to be using the data from the supplemental, not the “Proceeds from Broker” section that is reported directly to the IRS. Since there was no correction to the supplemental, and it appears to be correct, my return also appears to be correct, even without applying any of the 1099-B corrections. I’m not so sure the 1099-B “Proceeds from Broker “ section is actually serving my return any purpose. When I edit the 1099-B in EasyStep mode, it shows my the supplemental transactions, not the “Proceeds from Broker” transactions, so I’m not so sure there is actually anything for me to correct. The IRS will use their copy of the 1099-B to verify that my 8849 and schedule D totals look correct, but since the 1099-B is not actually part of my return, it seems I don’t even need to correct these errors (and in fact there may be nothing to correct). Am I understanding this correctly?