If you are able to defer the reporting of gain or loss until the year the short sale closes, there are certain notations you can make on your Form 1040, Schedule D (PDF) that will allow you to reconcile your Forms 1099-B to your Schedule D and still not recognize the gain or loss from the short sale. You will also need to attach a statement explaining the details of your short sale and that it has not closed as of the end of the year. Include your name as it appears on the return and your social security number.

For more on these rules and exceptions that may apply, refer to Chapter 4 of Publication 550, Investment Income and Expenses.