Spur,

You can file an amended return 1040X, if you would like to which can be done right away. It's better to utilize this year since there is a limitation as to how much you can deduct each year. for example, if you happen to have a net loss of 6000 next year, your limit to deduct is 3k. In that case, you can deduct 3k next year and 3k following year. Therefore, I would recommend to file an amended return for 2009. However, theoritically you should be able to report this loss next year too since these losses can be carried forward.