Your disability annuity Tier 1 component is subject to a reduction if you also receive worker's compensation or another public, disability-based, benefit before you reach Full Retirement Age. This reduction requirement may apply even if you received a lump-sum or an amount divided and paid in several payments. If you receive a public disability or worker's compensation award, or if the amount you receive changes, notify the RRB as soon as possible. Delay may cause a large annuity overpayment of your annuity.