No matter what kind of pension or retirement plan your employer offers, you should keep certain documents indefinitely to ensure that your retirement benefit is paid correctly. Based on our experience with finding lost retirement income and assisting workers and retirees to get the benefits they have earned, we recommend that you save the following information.
Midenjak, Mia, "Protect Your Pension: Important Documents You Should Keep" (2012). Pension Action Center Publications. Paper 5.