Answered on May 05th, 2013 at 1:43 PM
If the benefits you receive are Social Security Disability Insurance benefits, the pension payment would not affect your monthly benefits.
If the disability benefits you receive are for Supplemental Security Income (SSI), the pension payment must be reported to SSA and will affect your monthly benefit. For how long depends on the size of the lump sum benefit.
No attorney-client relationship has been established because of the information provided. Seek local counsel to address your particular facts. MJHJ