I am new in investing and still learning. I set up an account to vanguard and I encounter this cost basis. I would like to ask any suggestion what to do about it. Will I choose average cost, FIFO or specific identification? I read some blogs and article that specific identification is better. I would like to ask if it would be complicated if I choose the specific ID. I hire tax preparer to do tax foe me and my husband for the reason we don?t want to mess up our irs. Just an average here and very new when investing in stocks and index funds... thanks...