A benefit statement is a report prepared by a retirement system for each active member that summarizes information about his retirement account. It includes the member's plan, beneficiaries, and service credit. Members in contributory plans also receive a report of their contributions and interest.
If employees are in an occupational pension scheme, they receive regular benefit statements which explain how much pension benefit they have earned.
This is a statement from a pension scheme, telling you (based on certain assumptions) what your benefits are going to be. You will probably be sent one each year.