Does my T5008 factor in adjusted cost basis?

IBKR is required to provide the IRS with cost basis detail on covered securities transactions for U.S. persons via the year-end Form 1099.  U.S. persons, therefore, may not change the cost basis on a transaction executed by IBKR and may only change the cost basis on positions transacted elsewhere and transferred to IBKR under the following circumstances:…

IBKR will not automatically send cost basis information to the receiving institution for outbound Free of Payment Transfer of Global Securities transfers. However, if the receiving institution requests to receive a cost basis report for the transferred securities, IBKR will send a Cost Basis Report via email upon your request…

IBKR only offers a non-guarantee VWAP order that will be filled on a Best Efforts basis. 

More information regarding IBKR's VWAP order type can be found on the IBKR website. We also recommend…

IBKR cannot update the cost basis on the Worksheet for Form 8949 once the worksheet is generated…