This document is the Schedule SB - Single-Employer Defined Benefit Plan Actuarial Information form that is filed as an attachment to the Form 5500 Annual Report. It requires single-employer defined benefit plans to provide detailed actuarial data, including information on plan assets, funding targets, current liabilities, contribution amounts, and actuarial assumptions and methods. This schedule is used to assess the plan's funding status and compliance with minimum funding requirements for single-employer defined benefit plans.