Section 83 most commonly applies to stock-based compensation arrangements, such as grants of restricted stock, transfers of stock upon the exercise of a nonqualified stock option and transfers of stock under a restricted stock unit award. A stock option is generally not treated as property; rather, section 83 applies to stock transferred upon exercise of an option.
Under recently released proposed regulations, the IRS clarifies that a substantial risk of forfeiture may be established only through a service condition or a condition related to the purpose of the transfer. The proposed regulations also require companies to take into account the likelihood that a condition related to the purpose of the transfer will occur.

