I want to enter the cost basis (line 1e) for an E-Trade 1099-B. there was also a supplemental information form document along with the 1099-B. But cost basis information differs between 1099-B and supplemental information form. when I am claiming RSU and ESPP cases, which document I should use?
My best guess is I should use an adjusted cost basis from the supplemental information form instead of 1099-B for both RSU and ESPP cases, want to confirm with tax experts here.
