from IRS PUB 550
You can figure your gain or loss using a cost basis below only if you did not previously use an average
basis for a sale, exchange, or redemption of other shares in the same mutual fund.
To figure cost basis, you can choose one of the following methods.
• Specific share identification.
• First-in first-out (FIFO).
thus if you have never used the average cost basis for the sale of the mutual fund you can use specific identification
