Internal Revenue Service

http://www.irs.gov

Social Security Calculators

http://www.ssa.gov/planners/calculators.htm

Employee Benefits Security Administration

http://www.dol.gov/ebsa

Employee Benefit Research Institute

http://www.ebri.org

American Society of Pension Professionals & Actuaries (ASPPA)

http://www.asppa.org

Pension Benefit Guaranty Corporation (PBGC)

http://www.pbgc.gov