You enter the Form 1099-B in the Investment Income section of the program. On the screen to enter the sale information there is a Sale Category where in the dropdown you can select the X code.
To enter an investment sale from a brokerage account (1099-B), follow the steps below.
Or enter investment sales in the Search box located in the upper right of the program screen. Click on Jump to investment sales
When I click the code type drop down, there is no choice for Code X. Not sure how to enter the Box 5 info now...
The code X means that the holding period is not known by the brokerage firm, but you must select a holding period to report on the tax return.
Typically, when it's not known by the brokerage firm and the security is non-covered it indicates it's a holding that was in the account prior to the rules that required firms to track basis. Therefore, "Unknown" for holding period is almost always going to be long-term.
In the drop-down box, indicate long-term, non-covered for the type of security.