In a defined benefit plan, the amount paid to the retiree after employment is known (or is easily calculated); what is unknown is the amount required to provide the benefit as it depends on interest rates (often over a long period of time). Also they are not portable (in most cases); if an employee leaves the employer outside of retirement, the pension is greatly reduced if not completely eliminated altogether. While defined contribution pensions are still common in the public sector (the [[Federal Employees Retirement System]], and its predecessor the Civil Service Retirement System, are the best known), they are rapidly disappearing from corporate America. | In a defined benefit plan, the amount paid to the retiree after employment is known (or is easily calculated); what is unknown is the amount required to provide the benefit as it depends on interest rates (often over a long period of time). Also they are not portable (in most cases); if an employee leaves the employer outside of retirement, the pension is greatly reduced if not completely eliminated altogether. While defined contribution pensions are still common in the public sector (the [[Federal Employees Retirement System]], and its predecessor the Civil Service Retirement System, are the best known), they are rapidly disappearing from corporate America. |