Like an investor, a trader must report each sale of securities (taking into account commissions and any other costs of acquiring or disposing of the securities) on Schedule D or D-1 or on an attached statement containing all the same information for each sale in a similar format. However, if a trader previously made the mark-to-market election (see below), each transaction is reported in Part II of Form 4797 instead of Schedules D and D-1. Regardless of whether a trader reports his or her gains and losses on Schedules D and D-1 or Form 4797, the gain or loss from the disposition of securities is not taken into account when figuring net earnings from self-employment on Schedule SE. See the Instructions for Schedule SE for an exception that applies to section 1256 contracts.