The various codes on your Form 1099-B affect how your sales will be reported on your income tax return. TurboTax will enter this in the right place.
Box A means you bought and sold a stock within a year's time and your broker reported the sale and purchase price to the IRS.
Box C means you bought and sold something within a year's time and your broker was not required to report the sale to the IRS (however you must still include it on your income tax return).
Box E means you bought and sold something after holding it for more than a year. Your broker reported the sale price to the IRS but not the cost. Your broker may provide you with the cost or you may have consult your records to find the cost.
Box F is similar to Box C only you held the item for more than a year before selling it. However you broker was not required to report the sale to the IRS.
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