Before I try to figure it out, does anyone know if the IB 1099 for futures includes trades on foreign exchanges or if it only includes US trades? For example would FTSE 100 or DAX gains/losses be included?
Box 4 is the amount of federal income tax withheld from the sale. IB does not report amounts for Box 8, 9 and 10. Box 11 is the aggregate profit or loss of lines 8, 9 and 10 on regulated futures contracts (and options on futures contracts) for the year. Refer to Form 6781 and Instructions for guidance on how to report this amount.
Single stock futures are not considered to be regulated futures contracts and thus transactions involving these types of financial instruments are not reported.