You will complete a W-4P form upon retirement for your federal tax withholding; You can update your W-4P at any time; Consult a tax professional for guidance. Please note that you must have performed the duties of the Group 2 position for at least 12 months immediately prior to termination or retirement.If you are actively employed or on a leave of absence you may file your application to retire up to 120 days before you plan to retire. Employees' Retirement System. Employee Benefits; Retirement Plans. There are 104 contributory retirement systems within the Commonwealth of Massachusetts. The City of Woburn Retirement System is one of them. You are defaulted into the Massachusetts State Employee Retirement System (MSERS) and some employees may be eligible for the Optional Retirement Program (ORP). The Federal Government is made up of two main retirement systems, the Civil Service Retirement System (CSRS) and the Federal Employees Retirement System (FERS). Massachusetts public employees do not participate in Social Security as government workers.