. 123 ( r ) , 201cshare-based payment , 201d using the modified prospective method . sfas no . 123 ( r ) requires entities to recognize the cost of employee services in exchange for awards of equity instruments based on the grant-date fair value of those awards ( with limited exceptions ) . that cost , based on the estimated number of awards that are expected to vest , is recognized over the period during which the employee is required to provide the service in exchange for the award